c4 modification
Thread Starter
Advanced
Joined: Jun 2010
Posts: 86
Likes: 1
From: Puyallup Washington
c4 modification
I just got an off road h pipe for my car and am wondering what other mods to do with a 500$ budget im thinkin a throttle body or injectors tell me what you think thanks, by the way i have an 86 TPI
Racer
Joined: Apr 2010
Posts: 409
Likes: 1
From: New York
Well if you have the original Injectors Id definitely check them out to see if the meet specs OHMs etc Fic sells em pretty damn cheap. If the car is running well, Idles well, you can probably skip injectors. I only mention this because you mentioned Injectors
Id do a set of under pullies and a chip from hypertech or superships and a ported throttle body. That should make you feel nice for now and leave a few bucks in your pocket. Id buy everything on ebay for way less and id get it used. The pullies you probably wont find used but who knows perhaps you will. Hope that helps
Id do a set of under pullies and a chip from hypertech or superships and a ported throttle body. That should make you feel nice for now and leave a few bucks in your pocket. Id buy everything on ebay for way less and id get it used. The pullies you probably wont find used but who knows perhaps you will. Hope that helps
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
All right if you want to turn fans on sooner
Most here wouldn't waste the $$ on a Hyper cr*p chip
http://forums.corvetteforum.com/c4-t...-are-exhs.html
http://forums.corvetteforum.com/c4-t...post1564778076
http://forums.corvetteforum.com/c4-t...tech-chip.html
http://forums.corvetteforum.com/c4-t...-any-good.html
http://forums.corvetteforum.com/c4-t...tech-chip.html
And a bigger TB is a waste on a otherwise stock engine
See here for mods what works and don't
http://temp.corvetteforum.net/c4/vader86/minormods.html
http://temp.corvetteforum.net/c4/vad...dstrategy.html
Best bang for $$$ on L98 is long tube headers and decent exh system
Cheapo painted ones $170
http://www.summitracing.com/parts/HED-68440/
Most here wouldn't waste the $$ on a Hyper cr*p chip
http://forums.corvetteforum.com/c4-t...-are-exhs.html
http://forums.corvetteforum.com/c4-t...post1564778076
http://forums.corvetteforum.com/c4-t...tech-chip.html
http://forums.corvetteforum.com/c4-t...-any-good.html
http://forums.corvetteforum.com/c4-t...tech-chip.html
And a bigger TB is a waste on a otherwise stock engine
See here for mods what works and don't
http://temp.corvetteforum.net/c4/vader86/minormods.html
http://temp.corvetteforum.net/c4/vad...dstrategy.html
Best bang for $$$ on L98 is long tube headers and decent exh system
Cheapo painted ones $170
http://www.summitracing.com/parts/HED-68440/
Last edited by rodj; Jun 22, 2010 at 02:37 AM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Did you read the modification links I put up above ? 
"So the best bet is to install longtube headers, Most will show the same 10-15rwhp gain",
Long tubes are long tubes;
I doubt you will see any difference on a stock engine compared with the $600 ones
http://www.jegs.com/i/Hooker/520/2149/10002/-1
"So the best bet is to install longtube headers, Most will show the same 10-15rwhp gain",
Long tubes are long tubes;
I doubt you will see any difference on a stock engine compared with the $600 ones
http://www.jegs.com/i/Hooker/520/2149/10002/-1
Last edited by rodj; Jun 22, 2010 at 03:49 AM.
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
No throttle body, no chip, headers are a good idea. The coated Hedman Elites are only $360. Get the coated ones. They will work with a H pipe but you may have to adjust the length. Check out Summit. Don't replace injectors until they go bad.
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Slingshot
Joined: Dec 2001
Posts: 3,817
Likes: 24
From: Charlotte NC
FWIWhttp://temp.corvetteforum.net/c4/vader86/
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 234
From: Bangkok, Thailand
Better mufflers? Flowmaster has a cat-back system for your car that is just under $500. http://www.summitracing.com/parts/FLO-17153/
I'm curious though - what brand h-pipe did you get, and is it mandrel bent?
I'm curious though - what brand h-pipe did you get, and is it mandrel bent?
Last edited by mcm95403; Jun 22, 2010 at 11:26 AM.
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
Instructor
Joined: Jul 2008
Posts: 112
Likes: 0
Exhuast seems to be the easiest and cheapest upgrade. Anybody used any of the duel exhuast setups? I have a friend with a Muffler shop but he always said he couldnt remove CATS even if I live in a state with no Emisions checks (North Dakota). Google searches make it look like the only lwas i have to worry about is "no bypass or cutout" so a standard mufflered duel exhuast should be fine. or am I missing some part? As long as I put in a bung for the O2 sensor shouldnt I be fine?
I was looking at some Headers, duels and 2 mufflers at the back in the standard spot.
I was looking at some Headers, duels and 2 mufflers at the back in the standard spot.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
with rodj on list of modifications and Vader86. If you read Vader's web site you will come up with a better understanding of what works and what does not.Exhaust
1.6 RR
Better intake/runners/plenum
forget TB - the stock can handle up to about 400 HP and you are far from that.
Forget Hypertech chip
I don't think the "H" pipe will give you much, especially if you have installed the "test pipe". You should see a good gain with just this.
Cut out air cleaner box louvers.
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 234
From: Bangkok, Thailand
What do you mean by "gets realy shakey"?
You can install roller rockers yourself, it's pretty low on the difficulty scale. If you have a shop do it, it should be 1 hour or less for a shop mechanic to do.
You can install roller rockers yourself, it's pretty low on the difficulty scale. If you have a shop do it, it should be 1 hour or less for a shop mechanic to do.