91 corvette perfomance? whats it take?
Thread Starter
3rd Gear
Joined: Jan 2008
Posts: 3
Likes: 0
91 corvette perfomance? whats it take?
hello iam a newbie love the sight!
i have had a 1991 vette since 93 it has 40,000 miles on the stock engine i want to put some power into it but nothing to extreme just wondered what other people have done.
do,s and donts.
thanx guyd for all your help.
i have had a 1991 vette since 93 it has 40,000 miles on the stock engine i want to put some power into it but nothing to extreme just wondered what other people have done.
do,s and donts.
thanx guyd for all your help.
Last edited by Gray Fox; Jan 9, 2008 at 11:01 AM. Reason: removed inappropriate word
Melting Slicks
Joined: Dec 2006
Posts: 3,374
Likes: 86
From: Corbin KY
Gears is a GOOD choice in a Auto. I started with all the free mods (timing, t-stat, cut air lid, etc) and tuned it up. I then put headers and a decent exhaust on it. I was amazed at the difference all this made. Before I started it would barely turn the tires over from a dead start, after all this they wont stop spinning until I lift or shift.
Burning Brakes
Joined: Aug 2005
Posts: 1,172
Likes: 9
From: '88 TPI L98/HotCam Powell, Ohio
Hi and welcome! The first thing I will suggest is that you fill out your profile. It's a big help if "we" know where you're from and the details of your car. (year,auto/stick...)
The above posts look like great advice. I think the exhaust is the #1 improvement for the older models. Headers and exhaust will make it feel like a totally different car. Keep your eye out for some used headers and you should get away w/ the whole system for ~$1000.
That should leave you enough left over for gears (if you have an automatic).
There is plenty of info on this site so get comfy and click on :
1) Search 2) advanced search 3) type your interest 4) archives 5) c4 tech and performance 6) enter
Matt
The above posts look like great advice. I think the exhaust is the #1 improvement for the older models. Headers and exhaust will make it feel like a totally different car. Keep your eye out for some used headers and you should get away w/ the whole system for ~$1000.
That should leave you enough left over for gears (if you have an automatic).
There is plenty of info on this site so get comfy and click on :
1) Search 2) advanced search 3) type your interest 4) archives 5) c4 tech and performance 6) enter
Matt
Last edited by mrc24x; Jan 19, 2008 at 09:35 AM.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
i wanna stay within 2 grand
Then do the low $$ mods:
-cut lid w/ K&N
-toss the frisbee from the water pump pulley (see my site)
-low temp T-stat & fan switch
-AFPR to bump fuel pressure a little over the stock setting
These mods should push that conservative 240chp to around 300chp and you will feel it...
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Drifting
Joined: Nov 2006
Posts: 1,714
Likes: 20
From: Ontario
For an L98 a high flow exhaust, including FL headers will yield very good results.
Then do the low $$ mods:
-cut lid w/ K&N
-toss the frisbee from the water pump pulley (see my site)
-low temp T-stat & fan switch
-AFPR to bump fuel pressure a little over the stock setting
These mods should push that conservative 240chp to around 300chp and you will feel it...
Then do the low $$ mods:
-cut lid w/ K&N
-toss the frisbee from the water pump pulley (see my site)
-low temp T-stat & fan switch
-AFPR to bump fuel pressure a little over the stock setting
These mods should push that conservative 240chp to around 300chp and you will feel it...
with what everyone said, after doing the cheap mods and the exhaust my car felt much more powerful. if you have an auto gears will make a big improvement so go with that after exhaust if you do, if you have a manual then:
the first main goal with the L98 is to get it to breath better so if you have some money after you do the exhaust look around in the Parts section and see if you can find yourself a new intake manifold (superram for increasing the mid-range power a lot without losing low end while increasing top end a bit, LT-1 will require some modifications but flows very well up high, miniram is similar to LT-1 but it's a bit easier to install and costs more.)
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Hedman Elite LT headers www.summitracing.com @ $400-$500
true dual exhaust www.corvettecental.com @ $250
ZZ9 camshaft TPiS sometimes on ebay @ $250 @ $1000 to install
3 piece March aluminum under drive pulleys @165 Thunder Racing
Minor mods:
TB Bypass
Cut lid K&N
Remove frisbee
true dual exhaust www.corvettecental.com @ $250
ZZ9 camshaft TPiS sometimes on ebay @ $250 @ $1000 to install
3 piece March aluminum under drive pulleys @165 Thunder Racing
Minor mods:
TB Bypass
Cut lid K&N
Remove frisbee
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
my website has suggestions, click my name
With 2K, I would first do the exhaust. Headers, new main cat, new mufflers/catback.
Then my question would be if its a 6 or an automatic. If auto, go with a 2000-2200rpm Torque Converter. Otherwise dont mess with anything, wait on gears til a plan forms.
1.6RR, maybe a new intake base manifold would be good things to do.
With 2K, I would first do the exhaust. Headers, new main cat, new mufflers/catback.
Then my question would be if its a 6 or an automatic. If auto, go with a 2000-2200rpm Torque Converter. Otherwise dont mess with anything, wait on gears til a plan forms.
1.6RR, maybe a new intake base manifold would be good things to do.
Racer
Joined: Mar 2007
Posts: 266
Likes: 6
From: Elkhorn Nebraska
I was able to acheive 297 HP and 401 TQ by adding a good pair of long tube headers, Magnaflow exhaust, open air cleaner lid with K&N, adjustable fuel pressure regulator, hotter coil, good plug wires and plugs. This was on my 91. Also if you have a six speed, a single mass flywheel will help!
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Le Mans Master
Joined: Apr 2005
Posts: 6,413
Likes: 9
From: The Old Dominion
I was able to acheive 297 HP and 401 TQ by adding a good pair of long tube headers, Magnaflow exhaust, open air cleaner lid with K&N, adjustable fuel pressure regulator, hotter coil, good plug wires and plugs. This was on my 91. Also if you have a six speed, a single mass flywheel will help!
Melting Slicks
Joined: Jul 2007
Posts: 3,200
Likes: 34
From: Kingsville Ontario Canada
I was able to acheive 297 HP and 401 TQ by adding a good pair of long tube headers, Magnaflow exhaust, open air cleaner lid with K&N, adjustable fuel pressure regulator, hotter coil, good plug wires and plugs. This was on my 91. Also if you have a six speed, a single mass flywheel will help!
Those are great numbers!!
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
not from a dead stop it won't.
for the street, its the worst mod. the light weight FW is for racing, oval track, etc.
you trade fast revs for lousy street manners. a net loss in my book.
for the street, its the worst mod. the light weight FW is for racing, oval track, etc.
you trade fast revs for lousy street manners. a net loss in my book.
Last edited by Red Tornado; Jan 20, 2008 at 12:07 PM.
Drifting
Joined: Feb 2003
Posts: 1,614
Likes: 163
From: Davis CA
Don't forget to stay smog legal or be prepared to risk having to perform considerable work every two years or so to pass. Except for long tube headers, there are smog legal options for everything else mentioned (I think).