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

C4 best performance upgrades

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Old 11-19-2014, 11:05 PM
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nelson1230285
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Default C4 best performance upgrades

Hello, this is my first post on this forum and I've recently decided to buy a C4 corvette. I'm 18 and I've never bought a car before so this will be my first. I originally looked at a 2014 Mustang GT but there were issues with the car and that fell through. So I decided a C4 Corvette would be the best option! As you can tell, I like American muscle and a big V8. For reasons such as the gas milage and appearance, coming from a toyota sequia limited. Now to the question. What would be the best year to get because currently I'm looking at a 1988 with 39,000 miles and great interior. And secondly, what would be the best mods to get on it horsepower wise, because I know very little about cars however I'd like to know more. Thank you for your time.
Old 11-19-2014, 11:18 PM
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THE 383 admiral
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Welcome,
A TPI system with very low miles that's as good as new. Nice find!! Well a 350 is not really a big engine. But it can moded to produce 450hp fairly easy. Simple mods exhaust, Throttle body coolant elimination, cold air kit, used billet pulleys, 180 stat, a ECU tune GM slacked off. left a large margin to gain.
92 - 96 LT1 has 300hp higher RPM range vs TPI 240hp low torque system

Last edited by THE 383 admiral; 11-19-2014 at 11:25 PM.
Old 11-19-2014, 11:26 PM
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nelson1230285
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Thanks man! It's blue with beige interior. The interior is clean and I believe the engine bay is good. The only thing I've looked at is a magnaflow axle back exhaust.
Old 11-20-2014, 03:31 AM
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65Z01
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Check the condition of weatherstrip along the door glass and acoss the WS header and bow as well as the hatch.
Verify all "features" (headlights, radio, heater/AC, seat adjustments, etc.) operate smoothly.

If you are going to turn wrenches pick up a copy of the Shop Manual red 2-part set by HELM.

You can get 300chp w/o breaking the bank; if you want to push 400chp it will cost a "tad" (full exhaust,cam,heads,intake) more...

Do you plan to race the car?
Old 11-20-2014, 11:29 AM
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nelson1230285
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Right now I'm not looking to take a car to the drag strip haha. I might take it once to see my top speed but other than that I don't plan on taking it every week. However, I don't have any experience with fixing cars up as this will be my first car.
Old 11-20-2014, 01:49 PM
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Not true he can purchase a ZR-1 with 400+ HP standard.

If you can't get a ZR-1 then get a lt-4. If not then I would personally go for a '91 l98 with a six speed.

Good luck!



Originally Posted by 65Z01
Check the condition of weatherstrip along the door glass and acoss the WS header and bow as well as the hatch.
Verify all "features" (headlights, radio, heater/AC, seat adjustments, etc.) operate smoothly.

If you are going to turn wrenches pick up a copy of the Shop Manual red 2-part set by HELM.

You can get 300chp w/o breaking the bank; if you want to push 400chp it will cost a "tad" (full exhaust,cam,heads,intake) more...

Do you plan to race the car?
Old 11-20-2014, 02:15 PM
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An 88 with 40k would probably be a good choice to get. My usual advice is get the newest one in good condition that you can afford.

Then you need to drive it 6 months before you do anything to it. Buy a Helm Manual for the year, others can be helpful but you must have the Helm. You will need to spend money on maintenance issues that always come up with a car driven frequently.

Go to a corvette club meeting and listen to some other C4s before you buy exhaust systems.
Old 11-21-2014, 05:20 PM
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nelson1230285
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The reality is I have enough money to buy any car I want but I don't want to spend boat loads before I even go to college. So I wanted a nice car, big engine, cool look, that could also be decent on gas and lastly the insurance wouldn't kill me. So yeah I could get a new c7 but the c4 would suit me better (plus the back window opens )
Old 11-21-2014, 05:28 PM
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Hmmmm. I smell bull$hit.

Old 11-21-2014, 06:54 PM
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I have enough to buy a C7 Z06 twice over. However I have college and am trying to think of my future. But anyways, to the original question. I found some 90s and even some C5s, however they go up by the thousands as the years go.
Old 11-21-2014, 07:14 PM
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Originally Posted by nelson1230285
I have enough to buy a C7 Z06 twice over. However I have college and am trying to think of my future. But anyways, to the original question. I found some 90s and even some C5s, however they go up by the thousands as the years go.
a few thousands shouldn't matter to you if you can buy multiple c7s
Old 11-21-2014, 07:41 PM
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nelson1230285
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A dollar is a dollar, right? But what I'm getting from this is don't mess around with the engine, just get the newest I can?
Old 11-21-2014, 07:53 PM
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Originally Posted by nelson1230285
I have enough to buy a C7 Z06 twice over. However I have college and am trying to think of my future. But anyways, to the original question. I found some 90s and even some C5s, however they go up by the thousands as the years go.
Did someone call
Old 11-21-2014, 09:30 PM
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It sounds like you've found a nice '88! The C4 'vette does have some very attractive features, and it sounds like you are making some very wise decisions. Don't let a bunch of jealous guys give you any s**t! You'll be surprised how nice that '88 is! The later cars are so much more complicated, it's difficult to do your own wrenching! You'll learn as you go, so get that Factory Shop Manual (FSM) (published by Helm), and you'll be fine! Don't jump into a bunch of mods right away. I agree with vader86. Enjoy the car!!

And good luck with college!! Let us know what you decide about the car. (Hint: Keep your good fortunes to yourself to avoid hard feelings.)


Last edited by Hot Rod Roy; 11-21-2014 at 09:41 PM.
Old 11-22-2014, 11:56 AM
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nelson1230285
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Yeah I mean the reality is my mother passed away a few years ago and left me about $200,000. That money has grown and this is my 18th year old birthday present from them. So, yeah I could get a c7 but thank you Roy. I'm trying to make a very educated decision.
Old 11-22-2014, 12:13 PM
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Originally Posted by nelson1230285
Yeah I mean the reality is my mother passed away a few years ago and left me about $200,000. That money has grown and this is my 18th year old birthday present from them. So, yeah I could get a c7 but thank you Roy. I'm trying to make a very educated decision.
Good for you. Now let's stick to the subject, which happens to be Corvettes not money. A lot of people have money, but they don't use this forum as a platform for sharing information inappropriate for public consumption.
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Old 11-22-2014, 01:03 PM
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nelson1230285
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Thanks, I don't like boasting at all. But some people feel bad cuz they don't have it. So back to the thread. If I were to go with the 88 'vette what would be my first steps on the way to power gains?

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Old 11-22-2014, 01:26 PM
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Originally Posted by nelson1230285
So back to the thread. If I were to go with the 88 'vette what would be my first steps on the way to power gains?
A lower rear gear ratio will give you the best bang for the buck.

Next headers & full exhaust.

If its an auto trans car a custom tune & maybe 1.6 roller rockers then leave it alone.

If a manual trans car you need to address the intake, heads & cam otherwise you will be shifting @ 4800 rpm when the TPI runs out of breath.

88 manuals have the 4+3 Doug Nash trans. 89 up use the ZF 6sp.

Good luck.
Old 11-22-2014, 07:44 PM
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nelson1230285
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Hm the 88 I'm looking at is an automatic 4 speed I believe
Old 11-22-2014, 08:00 PM
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I have an '87 and I love it, but I think it could have a bit more *****. I was thinking about long pipe headers, but I reckon I would have to do the whole exhaust from tip to toe, and that may be costly. I do need a rear Y pipe, but I patched it for now because I dont want to replace it only to find that I have to waste it if I go with headers.


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