Crossfire injection vs tpi. ) Thanks! Jan 31, 2013 · Enthusiasts didn't have much to get excited about in the early 1980s. I am NOT swapping to tpi as it is largely way too expensive for almost no gain in power on a stockish engine. This weekend I am fitting hooker long tubs and a corsa cat back along with 1. Corvette Clinic-modified Throttle Body Injection and header system made Steve's '84 outperform the more powerful '86 models. Never really gotten into throttle body injection. just doing an LS swap. but the big news was the Despite the Crossfire injection's results, GM always felt it was capable of more than that. Tuned port injection has eight injectors feeding eight cylinders on the C4. Mar 23, 2017 · Looking through the years, we see Chevy's LB9 TPI 305 was first offered in 1985 as a replacement for the LU5 Crossfire engine. On a Firebird or Camaro TBI, this if very easy, TPI takes a bit more. Nov 13, 2014 · C4 General Discussion - Aftermarket intake manifold for Crossfire Injection - Hey guys, I see a lot of you on here who like to moan and complain about there not being any true way to increase horsepower simply on the crossfire injection, and its pretty annoying. The manifold has a lot of design and thought put into it and was fabricated by one of the leading manifold manufacturers in the country. Apr 1, 2006 · The only available C4 with crossfire injection is the 1984. The system was originally designed for a 305. SFI (Sequential Fuel Injection) is sequential in that only the injector that needs to fire does so. 0L: The new high-performance "Crossfire Fuel Injection" 5. C. Starting this year the Corvette was equipped with the Computer Command Control ECM and with the Model 400 Throttle Body Injection System. w/ a graded chip. If the throttle bodies are In this video I go over some of the best modifications for a Tuned Port injected Camaro,firebird or Corvette. I Apr 23, 2013 · For 1985, Chevrolet replaced the Cross-Fire system with a new Tuned-Port Injection (TPI), a fancy way of saying port type fuel injection, on the Corvette’s 5. There are aftermarket runners available and of course bigger injectors. 7L engines from the factory went from 205 HP (1984 Corvette/ crossfire injection) to 245 HP with the addition of TPI. FI but one thing is for sure you will spend way to much money making a crossfire go fast as opposed to swapping to a carb or another stand alone FI unit. Now I Sep 26, 2007 · If your looking to make a performance car out of it don't use the crossfire. Apr 30, 2003 · I've never played with Cross Fire. These systems according to the manufacturer ren Overview This guide covers pre‑OptiSpark Chevrolet/GM small‑block engines with Tuned Port Injection (TPI) or Throttle Body Injection (TBI) using HEI ignition with electronic spark timing (7‑pin or 8‑pin modules). You can buy a Renegade intake manifold for a Crossfire system and that'll take care of the breathing problems as it'll flow over 1000 cfm. I should see the dyno again in a few weeks after the test fit and ceramic coating. I still have the stock exhaust system. Weight and Agility: The TBI model is slightly lighter, enhancing maneuverability, making it ideal for tight trails, whereas the TPI’s weight contributes to its performance on varied terrains The third-generation Chevrolet Camaro is an American pony car which was introduced for the 1982 model year by Chevrolet. These were also the first Camaros with factory fuel injection, four-speed automatic transmissions, five . Oct 8, 2008 · A Crossfire engine is simpler to maintain (simpler design) than a TPI engine but, the TPI engine will have more stock hp/torque (245/345) and will get better gas mileage (16 city/26 highway but most TPI owners are getting 28 and even 30 highway!) due to a more efficient Port injection design. 1982 and 1984 were the only years for the Corvette with Crossfire Injection The crossfire injection engines are both balance and fuel pressure sensitive. The longer runners in the TPI setup promotes intake charge velocity and thus low end torque and throttle response. Jan 10, 2018 · The Cross-Fire Injection System seemed to be the answer. It served me well but it's time to Correct procedure for balancing/synchronizing the throttle bodies on a Crossfire Injection 305 or 350 (LU5/L83). With the intake manifold off, the port sizing was even smaller than for a 4bbl V-8! The later Tuned Port Injection (TPI) motors were MUCH better in all respects! CBODY67 1 T A Leader in 80's & 90's Fuel Injection GM - Ford - MOPAR Our main focus has always been GM fuel injection. Feb 6, 2007 · C1 & C2 Corvettes - Crossfire, worth it or not? - My wife's '61 is not stock, so we are going to do some mild upgrades on it. Accurate review after a few weeks of driving. chevythunder. I can't speak for the tuneablility difference as I haven't messed with any crossfire systems in that Jan 1, 2023 · It was totally stock with the exception of a set of Compomotive wheels. I spent my morning under my 82 CFI Corvette undoing what's needed for the upcoming engine removal and build. Types of Petrol Fuel Injection Systems Petrol injection methods vary based on fuel atomization, delivery timing, and combustion efficiency. 7L Small Block V8. Jul 31, 2013 · Only things I've heard about them were related to the fuel supply rather than the injection system, and the fact that they die on the top end but that's just due to the intakeTPI had the same problem and replaced Crossfire. 1982 was an eventful year, bringing in many interesting “firsts” – including the fuel-injection systems to cut off gas emissions and increase performances. Sep 16, 2010 · Anybody ever switch from Crossfire to Tuned Port Injection? Is it possible? Seems like it should be, it's a bassic 350. Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. This is the reason why the TPI also runs out of breath on high rpm's in the 350 L98. Jun 7, 2006 · Hey guys, I have a 1984 corvette with crossfire injection, I want to change to the TPI system they introduced in 1985, or some other type of intake system, but I kind of want the easiest bolt on situation without alot of mods, any ideas would be appreciated!! (everyone knows you guys are the Feb 14, 2006 · Originally Posted by nelson84 I drive a 84 state of the art crossfire injection, what is this "TPI" everyone is talking about? "o i do lov dat crossfire, got dem dual carberators and got too of dem cadalac convertores" actual quote from a man that came in my shop one day looking to have his car repaired May 21, 2003 · C4 Tech/Performance - 84 cross-fire injection retrofit TPI question? - How complicated would it be to convert a 84 cross-fire to a 85 or 86 TPI injection setup? I know the wiring harness and the CPU needs to be changed as well as the fuel pump. 0L V8, which employed a twin throttle body fuel injection system similar to that used in the 1982 Corvette's "Crossfire" 5. Oct 21, 2005 · A Crossfire vehicle doesn't run at the 85 tpi pressure. Oct 15, 2022 · Corvette has many models, but only 1982 and 1984 had crossfire injections, hence their names. Feb 25, 2009 · The L98 TPI (Tuned Port Injection) engine was however also designed for a 305 cid engine. Some people complain of the crossfire running poorly. com. Oct 17, 2007 · The crossfire was basically a dual TBI setup, whereas the tuned port injection utilized a fuel injector on each intake runner. I am also using the The LU5 5. 7L, and produced 165 hp. The GM vehicles built with these systems were Corvette, Pontiac Firebird & Trans AM, and the Chevrolet Camaro. So, I came across the Ram Jet 350, and the injector looks a lot like the original mechanical injection system. A throttle body system like the Crossfire injection (CFI) only needs two. Best intake for TPI in my opinion is the TPIS miniram. 1987-1995 GM TBI - Throttle Body Injection 82-84 GM CFI - Crossfire Injection Late 90's to early 2000's Volvo Penta, Mercruiser TBI 1985-1992 GM TPI - Tuned Port Injection 1992-1997 GM LT1 - Direct Injection Complete throttle Oct 30, 2022 · C4 General Discussion - 1984 C4 with a Tuned Port Injection Badge on the passenger side!? - Why does my 1984 C4 have a Tuned Port Injection Badge on the passenger side? Jul 21, 2006 · The 350/5. May 19, 2016 · Technological Advancement: Featuring Tuned Port Injection (TPI), the 350 L98 was Chevrolet’s first successful foray into the world of EFI (sorry L83 crossfire engine!). Are there any reliability issues with the injected cars vs. Apr 10, 2017 · C4 Tech/Performance - '82/'84 Crossfire TBI Flow Rates? - Looking to upgrade my TBI setup, and was wondering the flow rates of the stock '82/'84 injectors. Jan 30, 2012 · The LU5 5. '85 and up. The C5 fully embraces modern sports car architecture, the C4 was more of a transitional step. This was trick-looking stuff that helped user in the modern era of fuel injection. Sep 28, 2011 · vortec heads significantly out flow L98 stock heads the difference is an easy 30 hp or more in potential, when matched with a cam that allows the heads to breath, the best direct replacement cam to work with vortec heads and a tpi base combo Ive found in a flat tappet hydraulic cam for the earlier TPI engines is the CRANE 114132 cam, and If you aren't "in the know" about crossfire, and want to learn more, start at the Crossfire Injection Vault which is the main tech resource and message board for the crossfire community. Mar 14, 2008 · The L98 TPI (Tuned Port Injection) engine was however also designed for a 305 cid engine. I had an '82 with crossfire injection and while running quite well, it was a bit anemic on power. Sep 2, 2021 · C4 Tech/Performance - Edelbrock Pro Flo 4 4150 install/Replacing TPI - When I bought my 1985 Z51 4+3 over a year ago, I faced a decision. As with our column last month about six-speed transmissions, converting to a fuel-injection setup like the GM TPI will not be as cheap nor as easy as installing an 850cfm double-pumper Holley, but the benefits to using a fuel Jan 7, 2011 · C3 Tech/Performance - Crossfire Injection and a TPI fuel pump KOO BOOM! Help!! - Hi All Just Installed a 85 TPI Fuel pump in an 82 crossfire and the car has been running great for the last 3 days. I have trick flow 23 degree heads and a crane powermax 2040 cam. ” Even the venerable Iron Duke engine struggled to succeed in the third-gen Camaro chassis. a crossfire engine is simpler to maintain (simpler design) than a tpi engine but, the tpi engine will have more stock. May 3, 2007 · Hi I got a 1982 Camaro Z28 with the crossfire injection and the engine is bad, it is a 305 Sb and I want to use the crossfire on a 400 Sb truck engine. Mar 10, 2007 · This Chevrolet L98 TPI engine has its displacement stroked to 383 cubic inches and has stealth mods installed including a new cam and an extrude honed tuned port injection system to make 458 HP Sep 13, 2005 · C3 Tech/Performance - Crossfire injection - I have a frend who is considering the purchase of a low mile 1982 vette. They were fueled with the Crossfire Throttle Body fuel injection in 1984, but in 1985, fuel delivery changed to a Tuned Port Injected (TPI) system. I know X-ram went out of business some time ago and Nov 2, 2008 · Ive had several cross fire owners driving the 1984 corvettes ask about upgrading to the TPI as it flows a bit better and makes even better power than the crossfire engine, and the real question , that instantly brings up is why would any sane person going thru the trouble time and expense to upgrade from a totally restrictive cross fire system to a new EFI system select a stock TPI when theres The first thing you will need to do is remove the old fuel injection system from the intake manifold up. I am looking to swap from the poor flowing, poor power, and inefficient tbi to a more efficient and powerful injection system in my 1995 chevy silverado. com , but I am a little concerned about clearance Ive heard complaints about the crossfire injection on the c4s before 92 but theyre much cheaper and im on a budget. The Cross-Fire managed to do all that was needed: fit under the hood, and save Chevrolet from a fiasco of warranty returns and lost luster to its shining halo car. My thing is i don't have the desire to spend thousands of dollars on a new Sep 12, 2014 · its an 84 corvette with a TKO 600 and First TPi conversion. This new TPI system delivered low emissions and excellent fuel efficiency. 1982 was the last year of the C3, followed by 1984 with the C4. Jun 22, 2003 · You're about 6 months too late! :lol: I was a regular over there for some time, and I was familiar with the processes necessary to tweak the crossfire and chose to go TPI for a variety of reasons. Dec 20, 2007 · Crossfire to TPI swap, or TBI to MPFI Jump to Latest 6. These computer-controlled engines delivered more precise control of fuel and spark, yielding better fuel mileage and crisp throttle response in the process. Visit Pinpoint Air today and get started on your scrapyard build! C3 General - My Tuned Port Injection/Megasquirt Build Thread - Good afternoon and happy Father's Day. The car was backfiring/stumbling under throttle and could barely accelerate on the highway, as well as a myriad of other age related issues. they can answer about any question you might ask and explain all the standard mods: Jun 9, 2025 · The evolution of petrol fuel injection systems has led to significant advancements in performance, fuel economy, and emissions reduction. Read on to learn more on Chevrolet Camaro's from 1982-1992 in this buyer's guide brought to you by the automotive experts at Jun 18, 2023 · C3 General - My Tuned Port Injection/Megasquirt Build Thread - Good afternoon and happy Father's Day. First would be how many you need. TPIs are generally safe. Crossfire is an unmitigated disaster. 6 roller rockers to try to squeeze 40 more hp out. these guys are experts in the crossfire induction system, and can show you how to easily make your crossfire. In 1983 the advertised horsepower rating of the LU5 increased to 175 horsepower and torque increased 250 lb-ft. It continued to use General Motors ' F-body platform and produced a "20th Anniversary Commemorative Edition" for 1987 and "25th Anniversary Heritage Edition" for 1992. The setup featured a pair of throttle bodies mounted on an intake manifold that recalled the one found on the original Z28. We have overhauled/restored over 4000 TBI units since 2006. Mar 10, 2016 · We reflect back into the 3rd-Gen Camaro’s history to provide a comprehensive guide to the Reagan-era pony car. C4 General Discussion - What is this TPI everyone is talking about? - I drive a 84 state of the art crossfire injection, what is this TPI everyone is talking about? :toetap: :rofl: :rofl: :eek: :rofl: :rofl: Learn how to boost the power of your 305 engine with these budget-friendly mods and tips. A Tuned Port Injection (TPI) would need 8. Much of this also applies to 1980s GM big blocks and even‑fire V6s. I no longer have a partner and started a new company for Crossfire Injection by myself. Jul 26, 2022 · A trigger point injection (TPI) can help relieve myofascial pain, which is usually caused by a "knot" in your muscle (trigger point). Oct 19, 2019 · Well, I'm one of the creators of the Renegade manifold from the former company DCS - Dynamic Crossfire Solutions. The C4 Corvette era was from 1984 to 1996, and they were known collectively as the "Scientific Corvettes," according to automotive website edmunds. We can argue all day long about carb vs. Just looking for a way to get better injectors Apr 12, 2012 · Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. 2K views 8 replies 3 participants last post by muddpile Dec 22, 2007 M Mar 1, 2001 · Read the tech article on Chevrolet Corvette C4 TPI Upgrades, brought to you by the experts at Corvette Fever Magazine. Most of us know the advantages so I won't go into detail. TPI works and was in use across many GM makes and models for many years. Aug 25, 2004 · C4 Tech/Performance - 84 Crossfire to TPI conversion - I've been considering this for a bit now, and I'm curious to hear from any who have done this. The Holley Sniper also only needs two. What problems will i run in to? :welcome: Nov 26, 2024 · Key Takeaways Fuel System Differences: The KTM 300 TBI utilizes a traditional throttle-body injection, while the TPI features a modern transfer port injection, impacting fuel efficiency and emissions. I have read the threads on grumpvette about heads and cam from" Drawmain" from 2014, and from "Renegade intake" threads. Horsepower rose to 230 and torque jumped to 330 lb-ft. The balance part is to get both throttle bodies in unison with each other so that they both open and close together which will smooth out the idle quality. Are they super unreliable or what? Dec 25, 2010 · The earlier Crossfire Injection system had the same problem as it too ran out of breath at 4000 rpm when it was mounted on a 350" engine. Nov 27, 2008 · Staff member Dec 15, 2008 #3 Re: TPI start sequence thinking of swapping your carb to a TPI system? this should help, but keep in mind that the TPI produces good torque and good mileage but the intake design restricts air flow rates with the stock intake components above about 4500rpm, so its ment for cruising and low to mid rpm torque not peak hp Mar 12, 2023 · I show you how to PROPERLY disassemble, clean, and lubricate a GM IAC found on Crossfire Injection, TBI, and Tuned Port Injection (TPI) vehicles. One is to put a fuel injection system on the 327 someone put in it. On C4 vs C5, depends what you are looking for. For any vette generation, the general rule is later is better than earlier. DynamicEFI specializes in electronic fuel injection systems for automotive performance and efficiency. Out of the Apr 9, 2007 · C4 Tech/Performance - Holley Projection Vs Crossfire injection - Has anyone tried the Holley projection system on a 84 Vette (auto) with crossfire injection? Would there be any gains? I know that it would require changing of the intake. So why does it get so much hate, even from Corvette lovers? May 27, 2017 · Ok i have heard of the efficiency and power of tpi over tbi. 7 (350 CID) Cross-Fire Injection V8’s high-performance cam which gave the LU5 a very high compression ratio (by 1982 standards) of 9. Then on start up of day 4 GUSH!!! FUEL everywhere the front regulator diaphram blew out and leaked gas like crazy. I Apr 24, 2020 · Veteran automotive journalists weighs the pros and cons of building-up a stock 4 Corvette engine vs. I have the book Chevy TPI Fuel Injection Swapper's Guide and have thoroughly reviewed the site http://www. On my crossfire build I used as a base Dec 9, 2004 · The CrossFire was '83 and '84 and they knew the TPI was coming out in '85, and it wouldn't have looked good if they had come out with a tuned port system that made less power. I am interested in Jan 29, 2005 · I just picked up a chevy cross fire injection intake that I was thinking of modifing by changing the top plate and making a dual carb intake. The Key reason the the 88-92 L98 350 TPI motors made 245hp and the 93 LT1 made 275hp is that intake. 7 liter V8 thus changing the RPO code to L98. Jun 11, 2015 · The new crossfire injection system was not easily understood by Camaro owners that tried to do their own tuning, and shortly these engines earned the nickname “ceasefire engine. These are for those who want to keep their TPI l Oct 27, 2008 · The crossfire injection 305 was supposed to be the 1982 version of the 302 cross ram in the 1969 Z28. the 4 barrel cars. the '84 is the only c4 that technically doesn't have tuned port injection. Jul 26, 2003 · C4 Tech/Performance - L98 Crossfire!? - What if GM had installed the Crossfire intake on a '90 L98 long block instead of the L83. Jul 1, 2006 · The electronic fuel-injection system employed on the TPI provides even more-precise control of the fuel metering, thanks to the single injector situated at each intake port. Would I just be better off getting my throttle bodies reworked with better flowing Jan 12, 2021 · My Corvette C3 is equipped with the Crossfire Injection System. Nov 14, 2023 · C4 General Discussion - Crossfire to TBI smog laws in CA - I want to to get rid of the crossfire injection in my 84 and go with a TBI or TPI I know its more work but that's what I wanna do does anyone know if there is any smog laws that forbid this? Removed the Crossfire Injection and temporarily swapped to a single TBI on my 83 T/A. Below are the major types, ranked from the most basic to advanced Sep 29, 2017 · Hi, guys and gals. Q: What is the difference between TPI, SFI, MPFI, TBI, and CPI injection?A: TPI (Tuned Port Injection) is a "batch" fire system (from the factory) which means that each bank of injectors will fire all at the same time. Cross-Fire injection performed so well, in fact, that it was gone after … Read the rest of the story Nov 25, 2007 · about the TPI questions- edelbrock plenum, SLP runners,etc. It controls how much fuel is delivered and when, directly affecting performance, emissions, and fuel efficiency. Oct 19, 2006 · I would strongly suggest ignoreing the idea of swapping from a TBI (CROSSFIRE) to a TPI the cost and difficulty FAR exceeds the potential gains HISTORY OF GM PORT INJECTION The first production TUNED PORT INJECTION (TPI) appeared on General Motors vehicles in 1985. More precisely, it is the L83 5. My results: Stock L98 long block, Ported Crossfire intake, 2 bore housings, Modfied swirl plates, Stock injectors, Stock ECM with ADS chip, 5/16 lid spacer, 11psi fuel pressure. With the introduction of the L98, Chevrolet was entering a bold new world — a world where power, performance, and fuel economy could co-exist. TPI worked by injecting fuel into each cylinder and was controlled by a mini computer called the Electronic Control Module. L03/CFI tech and other performance enhancements. The crossfire had alot of issues with fires even back when they were unmodified & completely stock 5 years down the line. I show you how to PROPERLY disassemble, clean, and lubricate a GM IAC found on Crossfire Injection, TBI, and Tuned Port Injection (TPI) vehicles. Jun 28, 2008 · The 350/5. Both TPI and SFI have injectors located in every runner of the intake Oct 7, 2006 · Crossfire (aka CFI, for CrossFire Injection) is TPI without the port injection --- it still uses acoustic tuning to boost cylinder filling, but it does it with TBI (just like your engine) instead of port injectors. Mar 11, 2015 · Technological Significance: Featuring Tuned Port Injection (TPI), the 350 L98 was Chevrolet’s first successful foray into the world of EFI (sorry L83 crossfire engine!). It might have served merely as an interim method of fuel delivery before the debut of Tuned Port Injection (TPI). There are different types of injection systems, each with its own way of delivering fuel — from Single Point to Multi Point to Gasoline Direct Injection — reflecting ongoing innovations in engine Jul 28, 2006 · TBI - Throttle Body Injection discussion and questions. The firing order of the common V8 TPI is the same with the TBI fuel injection / crossfire fuel injection which is 18436572 rotating clock wise on the distributor. Dec 6, 2006 · A couple more questions regarding my future TPI swap -Which system is the better swap, the speed density or the MAF sensor? -Which aftermarket runners and base seem to work the best (accel, TPIS, Edelbrock, SLP, etc. heads flow practically identical numbers and the cam was almost as similar. You Jun 30, 2003 · Read the tech article on Chevrolet Corvette Fuel Injection, brought to you by the experts at Corvette Fever Magazine. The benefits of tpi were almost. post your questions here, lot of TPI guys here and you will also find some crossfire guys. Rather than spending money on fixing the Jan 24, 2020 · Cross-Fire injection was new for 1982 and found on Camaros and Corvettes. 5:1. The only differences were the addition of the TPI (1985) and improvements in the valve train (1987). 0 liter Cross-Fire Injection V8, used the Corvette’s L83 5. However, the Jul 29, 2022 · Compared to previous carburetor systems and cross-fire injection systems, the Tuned Port Injection system improved performance by 30 percent. First off, multiport injection. Dec 19, 2015 · C4 Tech/Performance - how to install a fuel pressure gauge in a crossfire engine - i know some braze a valve and the defunct DSC used to sell and inline one simply, any one can give me a step by step or give me a link for this i installed a 85-87 tpi pump in my 82 and I now would like to know what is up and the c3 Sep 23, 2018 · GM really started firing on all cylinders with the introduction of the Tuned Port Injection (TPI) system in 1985. Tuned Port Injection Vs Crossfire. So you need to choose what style of fuel injection you plan on using first before thinking about Oct 19, 2005 · C4 Tech/Performance - Can I Replace my crossfire injection with tuned port on my 84? - I was wondering if it is possible or feasable to swap the crossfire injection with a tuned port systemwould I need to replace the computer and wire harnesswhat is involved with that????? Jul 1, 2002 · Read the Chevy High Performance magazine's technical article on adding tuned-port injection to a Chevrolet small-block V-8 engine. The car has a renegade, hookers and 3:73 rear gear w/stock E. And it wasn’t going back. The technology is now available for you to stick a nicely modified 350 TPI in there. It has two throttle bodies in a cross ram style configuration. When installed on a 350 it runs out of breath at about 5000 rpm. It served me well but it's time to Aug 1, 2009 · C4 Tech/Performance - Converting Crossfire to TPI - What would be needed for me to convert my crossfire to a TPI Oct 27, 2005 · C4 General Discussion - Crossfire v TPI - For a DD is there much difference between the two, pro's and con's and any other thoughts please :bigears Just looking at this on Ebay for a DD so I can keep the 1990 6sp in good C3 Tech/Performance - Cross fire VS tuned port [READ THIS] - OK not trying to KNOCK ANYONE here JUST trying to give some prespectives on performance vs $$$$$$$$$!!!!! I have Sooooo MUCH info on these cars that I had to search to find the info to post CORRECT and HONEST numbers. The 1984 one also followed suit. In terms of maintenance alone, TPI is going to beat Crossfire. May 14, 2024 · You need to choose injectors based on A LOT of factors. I want to refresh my 1982 crossfire corvette. Before anybody gets the idea that the crossfire is a bad system it's not. There is NO difference between the TPI manifolds on the F-Body cars and the Corvette. I knew a guy that had an 83 Camaro with Corss Fire and he raved about it, but I always felt like I'd rather have a carbuerated engine if I couldn't have TPI ;-) Of course, thats just my biased opinion on TBI injections systems. I was thinking about doing a GM crate engine and then continue on with a Jun 13, 2025 · The fuel injection system is a crucial component in modern petrol engines. which is pretty much a LT1 intake designed for TPI. Origin Story of Corvette Cross Fire Though many consider the Crossfire system a mismatched assortment of Corvette crossfire injection using TBI 1227747 computer system Jun 21, 2015 · The CrossFire engines were not a performance engine, by observation, but looked the part with their "cross-ram" style intake, similar to many later '60s drag race engines. The rear throttle body contains the pressure regulator that regulates the pressure to the normal 9 to 13 psi range. 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