C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

More power L98

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Old Sep 11, 2004 | 09:02 AM
  #1  
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Default More power L98

To all ,

l have just reasently perchased a 1990 L98, and was wondering what are some of the low cost modifications l can perform to extract a few more horse power out of the stock engine.

l do plan on a full rebuild when the funds allow, but the engine has just had a full stock reco before l brought it so it seams a shame to pull it apart until it has a few miles on it.

Thanks for your time Getsom (Australia)
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Old Sep 11, 2004 | 09:09 AM
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on this site in the tech tips section there are some free mods you can do... They wont give you that big of an increase in HP, but its a good place to start, and it'll help you learn your car a little.
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Old Sep 11, 2004 | 09:09 AM
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hi, well i have a 91 and i started with remove frisbe, adjust fuel reg, a good exhaust since either way you go you will need one,k&n air filter, you can play with the timing alittle, do you do a full tune up, plugs ,wires, fuel filter,cap and rotor. coolant bypass i don't no what it gains if any heat keeps the heat out of the throttle body.
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Old Sep 11, 2004 | 09:47 AM
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Start with a new catback, then maybe headers, 1.6RR

I wouldnt call anything worth doing "cheap".

The free mods help, TB bypass, K&N filter and Cut lid, remove the frisbee, etc. Youll find details in a search.
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Old Sep 11, 2004 | 12:01 PM
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Exhaust mods, although not cheap, will give great gains on a stock L98.
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Old Sep 11, 2004 | 12:10 PM
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Originally Posted by TA
Exhaust mods, although not cheap, will give great gains on a stock L98.
I totally agree. I have a stock motor with only a few "free mods", but my exhaust is totally redone. I have a 2.5" catless front-Y, random tech cat, flowmaster cat-back and the performance difference was significant. I've heard many forum members comment on how restrictive the L98 exhaust is, but still kept my expectations low. Not only did I get better flow and performance in the mid and upper RPMs, but also got better torque in the low end as well. On top of all this, it sounds awesome, too.

Price wasn't too bad, either. I admit that if I had engine mods on my list I would have bit the bullet and got LT headers. But the issue there is that emmisions testing will be tough (if not impossible in PA), and the price wouldn't have been so inexpensive.

Parts were $800 and labor about $300. Best $1100 I've ever spent

Last edited by stick91; Sep 11, 2004 at 12:13 PM.
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