C4 corvette l98 I, like many of you, think the L98 runs too hot for comfort. 07:1 or 3. This package is an easy bolt-on package that will provide a very noticeable seat of the pants punch in horsepower and torque for Corvette owners. They look great, fit well, and run for $6--. Each engine had distinct characteristics and performance specs. Jan 10, 2003 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Apr 18, 2004 · Doug Rippie Motorsports (DRM) used to offer at one point an engine conversion for the L98. The convertible returned, as did higher performance engines, exemplified by the 375 hp (280 kW) LT5 found in the ZR1. Reply Subscribe Mar 1, 2004 · C4 Tech/Performance - [L98] Step-by-step for plenum removal - I know it's look fairly simple, but I'm looking for a step-by-step on how to remove the plenum. Dec 16, 2021 · The C4 Corvette dominated the 80s and early 90s. This summer I'm planning to port the intake from plenum thru the manifold and also the heads -- I'll be using David Sep 1, 2019 · Re: 1991 c4 corvette L98 engine questions, options, mass confusion. Jun 22, 2023 · The L98 was rated at 230 horsepower at 4,000 rpm with 330 foot-pounds of torque at 3,200 rpm. The question confronting power-starved . Because it seems to me that the intake system in general is being chocked. Sep 16, 2020 · A contemporary Porsche 944 Turbo was quicker and better built, but the L98 cost $10,000 less. Other than a K&N the car is bone stock. so what is usually the top speed of these motors with an Sep 17, 2010 · C4 Tech/Performance - Oil Temp Sensor Replacement - L98 - Any Tips? - Hello, I have tracked my false oil temp readings back to the sensor being bad. . I'd rather just pull the engine and replace it with an assembled crate engine. C8 Corvette. The LT1, LT4, and LT5 offer improved performance that would be expected as they were part of the ongoing Corvette evolution. 6 intake rockers as well. 7L VIN P Stant Aug 7, 2009 · C4 Tech/Performance - replacing injectors on 91 L98 - Have a 91 with 19000 miles. 7 L It seems like the L98 and LT1 are mostly alike except for the difference in HP and compression ratio and the LT1 has a optispark while L98 doesn't. Jan 12, 2006 · C4 Tech/Performance - Anybod seen gains with L98 long tube headers? - My goal is a 12. Thread Tools May 2, 2007 · C4 Tech/Performance - l98 top speed - basically my whole motor is stock from the delco filter to the exhaust. The headers come with ceramic coating from HPC (the only way to go IMO). Every single one of them runs out of power at around 4,300 rpm. Is this engine block sustantial enough to build a 383 stroker with a turbo or supercharger? I am looking for 500+ horse power and torque. 90 with street tires before I buy drag radials. It is bone stock with factory intake and exhaust. Took into dealer for a slight miss at idle. Other than that valve seats on L98 alloy heads do they support larger than stock valves or is stock the max size. Jul 30, 2013 · C4 Tech/Performance - Fuel pump upgrade for modified L98, will i see some improvement? - Hi guys i was reading about fuel pumps and this line caught my attention: The stock C4 fuel pump was rated at approximately 105 LPH and can only support 255 HP. I have a new timing chain, new harmonic balancer, new Trickflow mild camshaft, new high performance aluminum Trickflow heads, smog delete and bigger Jan 9, 2006 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Jan 7, 2018 · C4 Tech/Performance - TunerPro RT Connecting with 86 L98 (1227165 ECM) - Hello All, I've just finished rebuilding the engine in my 86 convertible (completely stock, no modifications) and am working on ironing out the issues and getting it to run correctly. 59 axle. Dec 13, 2010 · C4 Tech/Performance - Best air induction on a L98 - Guy's, I just put a throttle body extension and air foil from mid america on my stock '88 4+3 coupe and I can really feel the difference!! I am looking to pick up another 20-30 hp (exhaust is not an option). L98 350CI V8 Corvette Engine Oct 16, 2017 · C4 Tech/Performance - Cooling Down a L98, Is it Possible? - I know this has been hashed and rehashed many times, but I could not find a definitive answer. My best pass so far is a 13. Between all the costs and Aug 15, 2005 · C4 Tech/Performance - Where do you guys set your base ignition timing (L98)? - Hi guys, I set the timing to the stock setting on my '89 yesterday (6degBTC), and I got to thinking what would happen if I where to advance it a little. I have had some work done on it which includes: A cold air intake Hooker Super Competition headers Borla Exhaust Upgraded fuel injectors (24ib) and fuel regulator Custom programmed chip, programmed for the Apr 5, 2015 · C4 General Discussion - Best Choice: L98 vs LT1 - The L98 is Tuned-Port Fuel Injection & the LT1 is Sequential-Port Fuel Injection, so which is the better system for long term reliability & maintenance? :confused2: The C4 Corvette, produced by Chevrolet from 1984 to 1996, was known for its sleek design and powerful performance. 320 92-96 Corvette 5. The Tuned Port Injection system improved performance by 30 percent over previous carburetor systems and showed a 20 percent improvement over the cross-fire injection system. C8 Z06 Discussion; (L98 in other words) which includes a Feb 9, 2004 · C4 Tech/Performance - Help please with L98 (*#($ oil leak - My L98 has been plagued with various oil leaks for a while now; a few days ago it went onto a friend's lift and we spent several hours cleaning, searching and testingto no avail. Sometimes it takes several squirt and crank iterations to get it started. LT1 engine brought more horsepower and torque from 1992 onwards. i still manage to run mid 13s in the track and it looks like thats above average for a stock healthy l98 though with almost 177k on the original motor. 32, and I'm wondering if long-tube headers are worth the investment and might get me there. Aug 3, 2005 · C4 General Discussion - Best Exhaust Option For L98? - After much review on this forum and a lot of thought, I have come down to three options for my 91 A4. Goodshaft? ;) Think mine is getting lazy on shutdown as fuel pump runs for a second+ after keying off. Reply Subscribe . We are new sponsors on the block and would like to share something our shop (KLJ Corvettes) has started customizing for local customers. My main concern is if I'd have to loosen/remove the runners and how to disconnect/remove the MAT sensor under the plenum. May 29, 2003 · C4 Tech/Performance - I WANT THE TRUTH (about supercharging an L98)! - I first started seeing supercharging kits for the Corvette in magazines back in '88-'89 and was very intregued by what was being written. Jun 20, 2011 · C4 Tech/Performance - Difference between an LT1 & L98? - L98- 230 HP 330 Torque ft. Reviews. I have been having a stumble off idle when cold, seems to go away when the engine gets to operating temp. L98 and LT1 engines were the primary options for the C4 Corvette. News. They respond like a smallblock Chevy to mods otherwise. " So all conv are 245 hp. Reply Subscribe May 14, 2005 · C4 Tech/Performance - How to get 400HP out of my L98? - My tranny guy, who is very good, has advised me to not go over about 400 HP at the flywheel to give me good odds of not tearing up my 700R4. C4 Tech/Performance - L98 Turbo - Anybody know of a complete turbo kit for a stock l98? I saw HP Performance provided one about 12 years ago, but sadly, it looks like they'e out of business. Aug 1, 2002 · Chevrolet installed over 150,000 of these L98 engines in the C4 Corvette. Option #1: LT 1 5/8 headers into 2 small cats to an Feb 14, 2002 · When I was shopping, I debated the Lingenfelter L98 headers with HPC ceramic coating. Like to go without a Dec 18, 2003 · C4 Tech/Performance - What is the best fit headers for a L98 1990 - I am currently having my L98 being built into a 383 stroker and I want to put new headers on since the engine will be out. The Walbro 255lph can support up to 600 horsepower! My 87 is around Sep 11, 2004 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine May 31, 2018 · C4 Tech/Performance - L98 Tpi tuning and EPROM chip - Has anyone gotten into tuning their L98 themselves? I've heard there are after market EPROMs and compatible tuning software you can buy but I have yet to find much information on it. One of the notable engines used in the C4 Corvette was the L98, which had its strengths and weaknesses. And with its new six-speed, the Corvette was a lot closer to the Porsche than ever before. Sep 12, 2017 · C4 Tech/Performance - Opinions/real world experience wanted: LS swap or L98 build - Good morning Everyone, Just like the title says, just want some real world opinions and experiences about building up the L98 or going with an LS swap. These kits where from companies like The Carrol Supercharging Company (using Paxton superchargers) and where The Boos Performance L98 Bolt-On Package INSTALLED - $2,495! The L98 is a great engine, lots of torque but falls short for seat of the pants "punch" for some. 6 roller rockers, 30 lb injectors and self tuned with Moates and Tunerpro. If I squirt a blast of staring fluid it will fire off. It has the 3:07 rear, hi-flow main cat, and magnaflow SS catback. 7L VIN J Stant 14068 Valve diameter - 1. The Chevrolet Corvette (C4) is the fourth generation of the Corvette sports car, produced by American automobile manufacturer Chevrolet from 1983 until 1996. gas Apr 19, 2022 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine C4 Procharger Install. Jul 9, 2008 · C4 General Discussion - Holley Stealth Ram For Your C4 L98! - Hey folks, this is Greg from Ultimate Street Machines. Apr 21, 2010 · The heat load where it is located on a stock C4 gives the ECM. I was scrubbing down the engine yesterday, and left Jun 17, 2009 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Bleeding Coolant System on L98. Apr 19, 2004 · C4 Tech/Performance - L98 383 Stroker - I have a 1985 coupe with the stock L98. 7L VIN 8 Stant 13359 Valve diameter - 1. Buyer's Guide That, dearreader, is one serious C4 Corvette. Common to L98? - I think I have a leaky intake manifold gasket. Jan 28, 2012 · The 3" center pipe on the L98 is FAR more restrictive than dual 2. For a 350cid L98 based engine, they claimed 340bhp/425ftlbs; for a 383cid L98 based engine, they claimed 400hp/490ftlbs. Corsa says it gives a 15 HP gain over the stock LT1 system, so for an L98 you can easily double that. Thread Tools Sep 15, 2002 · C4 Tech/Performance - Intake manifold leak. Which aftermarket headers are the best fit for this engine without causing any problems! Apr 3, 2019 · C4 Tech/Performance - C4 won't start without Starting Fluid - After sitting for a day or longer, my C4 will not start when I'm cranking it normally. 33:1 axle ratios wich increased from 245hp to 250hp because of their less restrictive exhaust systems). Aug 17, 2017 · C4 Tech/Performance - Best Camshaft to use on a L98 without replacing the TPI - I own an 88 with an L98 with TPI. 310 90-95 Corvette 5. Nov 2, 2019 · While the overall aesthetic of the car remained largely the same from 1984 to 1985, the sophomore model of the C4 Corvette saw a significant refinement – the replacement of the L83 Cross-Fire Injected Engine with the 230-horsepower L98 engine with Bosch Tuned-Port Fuel Injection. These are great motors for driving around town. Is there any way to actually bring this engine to 180f max? I am thinking a bigger, 3 row radiator, and May 27, 2002 · Per the Corvette Black Book, the '90 L98 was "245 hp (except coupes with 3. L98 engine offered power and reliability from 1984-1991. 00" Min. Explore the Chevrolet Corvette C4 L98 Convertible 1985, 1986 detailed specs, including 0-60 mph times, horsepower, and handling data. lbs 5. Nov 1, 2013 · Corvette engine performance hit its nadir in 1980, when the 305ci, 180hp LG4 was the only engine available to California customers. LT4 engine, exclusive to the Corvette Grand Sport, added extra spice. I plan on doing a lot of performance upgrades such as comp valve springs and valve The Boos Performance L98 383 Stroker 450+ HP Package INSTALLED - $11,995! Have you ever had the opportunity to drive a car with a 383 in it? With over 450 HP these cars have endless power, as fast as you can get on the gas the car responds in Aug 22, 2006 · In case anyone is interseted in the opening size differences between the C4 model years here are the specs as sent to me by Stant. Thread Tools Nov 15, 2007 · C4 Tech/Performance - Camshaft for a 1986 L98? - I looked on the lingenfelter website, and I want to get the 219 cam, but it says only compatible with 1987-1996. Jan 23, 2009 · The weakest link in the L98 is the intake manifold. 5" pipes. After cleaning the old oily surfaces with brake cleaner we ran the engine Oct 25, 2001 · C4 Tech/Performance - Backfire thru intake - 88 L98 - I was out this afternoon, made a stop for about 1/2 hour got back in the car started it, ran ok for a second then it started to run rough. I never had it put on the dyno before/after, so I have no concrete numbers to give. Reply Subscribe Aug 4, 2007 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine Best intake for an L98. stroke @ full open - . I am going to get a super ram sometime soon. Thread Tools Jul 18, 2015 · C4 Tech/Performance - ZZ4 cam with L98 - Other than changing springs does it all fit together? Thinking 1. Aug 16, 2002 · C4 Tech/Performance - Crate Engine To Replace 88 L98? - I burned a piston screwing with boost and fuel mixtures (not ready to talk about it :cry ). 7 L LT1- 300 HP 330 Torque ft. It has 57k on the odometer. Jan 21, 2007 · C4 Tech/Performance - Porting on the cylinder Heads L98 - I have the 113 heads and want to port them to match the Accel SR base manifold and AS&M runeers or a SR Plenum and Runners set up (If I can get it!) for some added TQ & HP. Apr 11, 2006 · C4 Tech/Performance - valve cover replacement advice? - 85 l98 - I replaced my valve cover gaskets a couple of years ago and I guess I didn't get it right because I still have leaks - especially on the passengers side. Requirements would be around $5000 1988 L98 Corvette auto 2. Dec 20, 2010 · C4 Tech/Performance - What Gas to use in a 1991 L98 - Hey guys, Cold weather is here, and my father and I have been going back and forth on types of gas to run in the 1991 L98 6SPD with 100k on the clock, whenever I fill the car I put in the 93 octane prem. I have an 85 L98 and in my research Ive found that the sensor is located above the filter. His response was that 4 injectors needed replacement (they all had ohm readings in the 5 to 8 range he said). 2 days ago · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine l98 motor rebuild help. Sep 10, 2020 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine L98 Replacement fuel injectors. C4 General Discussion - Why does the L98 motor get no respect? - I have noticed countless threads that disparage the L98 motor. Anyway, the reason I think I have a leak is this. Jul 29, 2022 · Out on the track, the highly reliable, torquey L98 C4 Corvette proved practically unbeatable, earning itself an eventual ban from the SCCA’s Showroom Stock class and a creation of its own class for C4 Corvettes. Coverage by Vette Magazine. Here's what I've done, Superram intake manifold and 58mm TB, headers and dual exhaust, underdrive pulleys, an adjustable fuel pressure regulator, cut air cleaner and a K+N filter, aluninum heads off a 1990 with 1. Dec 31, 2011 · C4 Tech/Performance - Advance Timing For L98's - Hey guys, So I was doing a search about advance timing for L98's I already have a tune in the ECM by Painless Performance( I had my Air Ratio/Fuel Injector tuned) I was just wondering how can this help me if I advanced 4 degrees? Apr 8, 2010 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine L98 valve cover paint. Is it a 4 bolt main block? Thanks, Troy Jul 12, 2006 · Check out HP Performance's new L98 C4 turbo kit. Here is a look at some of the engines used in these cars throughout those years. What Im wondering nos is if anyone has any words of wisdom before I go after May 9, 2005 · C4 Tech/Performance - Best engine mods for a stock L98?? - This is an 89' coupe with a 3. I pulled out of the parking space and it started to backfire and run real rough then it finally stalled. Post by Bill Chase » Sun Sep 01, 2019 1:01 pm Yeah, tpi does a lot very good, if only they had designed it to pull another 1000 rpms making power. Once started, on any given day, it will Sep 21, 2018 · C4 General Discussion - Turbo on l98 engine - Hello Everyone, I have a 1985 Corvette and in the past year and a half I rebuilt the engine with performance parts. 12" Min. 86-91 Corvette 5. 07 rearend and automatic transmission. May 9, 2007 · C4 Tech/Performance - Upgrading the Stock L98 intake - I just had a few questions about upgrading the stock intake system on my 88. Jan 24, 2006 · C4 Tech/Performance - L98 oil pressure switch - Anyone replace the pressure switch for fuel system shutoff lately? Any thoughts on aftermarket replacement Vs Mr. Feb 4, 2005 · C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine L98 - installing the ProCharger. Get all the Info. really sucks because I would've loved to have one of those. Looking for that mid to high 400s for HP and torque. qcwwls ukg kpfa hszzkd sjhz ppqe yxqxt ataf sezfoj lkl