How to get better acceleration?
Thread Starter
Member
Joined: Feb 2004
Posts: 142
Likes: 0
From: Kansas City (Mission, KS)
Car: 89 RS with 350
Engine: 5.7
Transmission: auto
How to get better acceleration?
I'm a stupid newbie, I will warn you of that right now. I was racing my 85 Camaro and it totaly sucked. I got beat every time I raced tonight. All I know about my car is that its pretty much stock. Its got a K&N air filter on it and also a flowmaster. I wanna know what I could buy to get better acceleration outta my car. What parts should I be looking for? What cheap/little things can I do? I got an ADS Superchip, but from what I hear, they suck..Any help guys?
Thanks!!!
PS: Sorry for being stupid. I don't know car talk. I wish I did.
Thanks!!!
PS: Sorry for being stupid. I don't know car talk. I wish I did.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
I own an 85 IROC, LG4 as well. Check my mods for some ideas, especially the carb stuff. The tech board will show you how to do those mods. I have no experience with chips, but I've heard that on a carbed car, they're not really worth much. Advance the timing on your own and save some money. If you want to learn more about cars, hang around the boards, ask a lot of questions (members here are cool about helping newbies), also do searches. You'll find that many of your questions will be answered there.
JamesC
JamesC
Thread Starter
Member
Joined: Feb 2004
Posts: 142
Likes: 0
From: Kansas City (Mission, KS)
Car: 89 RS with 350
Engine: 5.7
Transmission: auto
Originally posted by ede
you'll feel more with a gear change than most mods you can do for the same money
you'll feel more with a gear change than most mods you can do for the same money
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Out of curiosity, what transmission are you running: 700R4 (auto) or T-5 (5 speed)?
JamesC
JamesC
Trending Topics
Supreme Member

Joined: Jul 2001
Posts: 3,974
Likes: 0
From: Pueblo Co
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
You need a better set of gears!
My 85 Z28 came with a 3.42 posi very reponsive at any speed, I miss that car
. All the other rear ends Ive seen are for crap highway gears. If you have a TPI its a 3.23 posi disk which is alright. If you have a carb most likely you will have the standard 2.73 open or a disk setup with more crap 2.77 or so highway gears. You need to pull the cover off the differential and find out.
A 3.42 setup will be the cheapest most bang for your buck item you can you can get. I got the 3.42 setup for my bird $100 at the bone yard, made a world of difference over the 2.73's. When I did the swap I honestly thought someone dropped a 502 under the hood while I wasent looking, it made that much of a difference.
Side note: Since I had the camaro 1st then latter got the bird I had no idea GM put these crappy gears in these cars for weeks I was wondering what was wrong with the bird since it had no power compared to the camaro.
My 85 Z28 came with a 3.42 posi very reponsive at any speed, I miss that car
. All the other rear ends Ive seen are for crap highway gears. If you have a TPI its a 3.23 posi disk which is alright. If you have a carb most likely you will have the standard 2.73 open or a disk setup with more crap 2.77 or so highway gears. You need to pull the cover off the differential and find out.A 3.42 setup will be the cheapest most bang for your buck item you can you can get. I got the 3.42 setup for my bird $100 at the bone yard, made a world of difference over the 2.73's. When I did the swap I honestly thought someone dropped a 502 under the hood while I wasent looking, it made that much of a difference.
Side note: Since I had the camaro 1st then latter got the bird I had no idea GM put these crappy gears in these cars for weeks I was wondering what was wrong with the bird since it had no power compared to the camaro.
Thread Starter
Member
Joined: Feb 2004
Posts: 142
Likes: 0
From: Kansas City (Mission, KS)
Car: 89 RS with 350
Engine: 5.7
Transmission: auto
Originally posted by SSC
A 3.42 setup will be the cheapest most bang for your buck item you can you can get. I got the 3.42 setup for my bird $100 at the bone yard, made a world of difference over the 2.73's. When I did the swap I honestly thought someone dropped a 502 under the hood while I wasent looking, it made that much of a difference.
A 3.42 setup will be the cheapest most bang for your buck item you can you can get. I got the 3.42 setup for my bird $100 at the bone yard, made a world of difference over the 2.73's. When I did the swap I honestly thought someone dropped a 502 under the hood while I wasent looking, it made that much of a difference.
TGO Supporter
Joined: Jul 2003
Posts: 4,803
Likes: 2
From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
a good dual plane intake with a decent carb and a good set of headers are also a good bet (following gears, if thats the path you wish to take)
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
As has been stated, pull the diff cover and find out what gears you're running. By the way, my carbed car has 3.23's stock. Anyway, you need a gear check to determine what carrier you'll require. 3.08's down require a series two carrier, 3.23's up, a series three. Check Summit or Jeg's for prices on gear sets. Guys who've swapped gears step in here. I "imagine" total cost--gears, installion kit, and labor--would run in the $300 to $450 range. A cheaper option would be to purchase a rear with the gears and brakes (possibly even a posi) you want. I have a yard nearby with a drum 3.73 for $150, for example. Though this is less important, you'll need speedo gears if you care about knowing how fast you're going. That swap, as I understand it, is simple.
The following are GM numbers stamped on the ring gear:
41 : 15 = 2.73
40 : 13 = 3.08
42 : 13 = 3.23
41 : 12 = 3.42
41 : 11 = 3.73
These are the RPO codes that might help you narrow you search--but I WOULDN'T count on them:
GU2 = 2.73
GU4 = 3.08
GU5 = 3.23
GU6 = 3.42
GT4 = 3.73
JamesC
The following are GM numbers stamped on the ring gear:
41 : 15 = 2.73
40 : 13 = 3.08
42 : 13 = 3.23
41 : 12 = 3.42
41 : 11 = 3.73
These are the RPO codes that might help you narrow you search--but I WOULDN'T count on them:
GU2 = 2.73
GU4 = 3.08
GU5 = 3.23
GU6 = 3.42
GT4 = 3.73
JamesC
Last edited by JamesC; Feb 15, 2004 at 08:13 AM.
Supreme Member

Joined: Jul 2001
Posts: 3,974
Likes: 0
From: Pueblo Co
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
Since you are a newbie to this area I'd highly suggest you forget installing a set of gears and just find a V6 bone yard setup. Its actually cheaper then installing a set of gears provided you can swap the rear end yourself. Of course this is all pending until you find out the actual ratio.
Thread Starter
Member
Joined: Feb 2004
Posts: 142
Likes: 0
From: Kansas City (Mission, KS)
Car: 89 RS with 350
Engine: 5.7
Transmission: auto
Well my father is the lead mechanic at the local Acura dealership. Whatever I want to do, he will probably help me. He doesn’t know that I want to do this right now. I just want to know what to buy, and how much to expect. Would going to a V6 have better performance than my current V8? Sorry, more newbie questions.
Thanks!
James
Thanks!
James
Originally posted by jc265
Would going to a V6 have better performance than my current V8?
Would going to a V6 have better performance than my current V8?
ssc told you to find a v6 setup cause a lot of them came with 3.42 gears stock
Supreme Member

Joined: Jul 2001
Posts: 3,974
Likes: 0
From: Pueblo Co
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
A V6 rear end is the same except for better gears. Find an 89+ one and it will have better axles if thats what your looking for. Doesent really matter to me which I use as long as it isnt a 2.73 axle. Its just alot easyer to drop in an enitre rear end then change the ring and pinion. With your dads help I bet you guys could knock it out in about an hour and a half. I do swear if you have 2.73's or 3.08's a 3.42 will give you exactly the performance you want.
Last edited by SSC; Feb 15, 2004 at 10:45 AM.
Thread
Thread Starter
Forum
Replies
Last Post
Pac J
Tech / General Engine
3
May 17, 2020 10:44 AM
RedLeader289
Tech / General Engine
10
May 28, 2019 01:47 PM








