Changing rear end ratio?
#1
Becoming pure track...
Thread Starter
iTrader: (1)
Join Date: Feb 2005
Location: Olympia, WA
Posts: 1,069
Likes: 0
Received 0 Likes
on
0 Posts
Changing rear end ratio?
The next thing I want to do, is change the rear end. I want either a 4.3, or I have even seen something like a 4.88.
If I stay all N/A, large street port on it's way, what would be the best to have to improve 0 to 100, maybe top at 125 or 130? Less wouldn't bother me. I am looking for acceleration.
Also, where is the best place / lowest price going to be? I have seen a 4.3 for sale at mazdatrix. I will probably buy all the other stuff for the rear since I will have it apart, why not rebuild most of it.
I might just wait and change the LSD too. I am looking at spending about $1.5k for everything. That expecting too little?
Thanks.
Mods in sig.
If I stay all N/A, large street port on it's way, what would be the best to have to improve 0 to 100, maybe top at 125 or 130? Less wouldn't bother me. I am looking for acceleration.
Also, where is the best place / lowest price going to be? I have seen a 4.3 for sale at mazdatrix. I will probably buy all the other stuff for the rear since I will have it apart, why not rebuild most of it.
I might just wait and change the LSD too. I am looking at spending about $1.5k for everything. That expecting too little?
Thanks.
Mods in sig.
#2
SCCAEP
iTrader: (3)
Join Date: Dec 2006
Location: Dallas
Posts: 1,080
Likes: 0
Received 0 Likes
on
0 Posts
4.3 is found in the GTUs, gear is available from Mazda and any place selling OEM parts. There is a 4.88 and 5.12 on the market but very hard to find. They are custom built by meshing a 1st gen pinion with one from a 2nd gen and usually found in ITS or EP race cars. These are expensive with the diffs going for around $2500 built (w/LSD) and $1500 used, assuming you can find for sale. I've never seen just the R&P go up for sale, it's usually the entire diff. As far as getting one? Don't know any for sale but there is someone who claims they can make the 4.88 or 5.12, you just provide both pinion gears - (around $500+ IIRC for the 1st gen pinion, 2nd gen easy to come by).
#4
SCCAEP
iTrader: (3)
Join Date: Dec 2006
Location: Dallas
Posts: 1,080
Likes: 0
Received 0 Likes
on
0 Posts
This was posted somewhere else by someone with Speedsource....
If you are running a 5.12 and GTU fifth (.76) you will run 122 @7000, 131 @ 7500, and 140 @ 8000. You will run out of motor before you run out of gear. This is with a 225/45/15 hoosier. Just for reference at 8000 you are :
1 30 mph
2 53 mph
3 77 mph
4 106 mph
5 140 mph
If you are running a 5.12 and GTU fifth (.76) you will run 122 @7000, 131 @ 7500, and 140 @ 8000. You will run out of motor before you run out of gear. This is with a 225/45/15 hoosier. Just for reference at 8000 you are :
1 30 mph
2 53 mph
3 77 mph
4 106 mph
5 140 mph
#7
Becoming pure track...
Thread Starter
iTrader: (1)
Join Date: Feb 2005
Location: Olympia, WA
Posts: 1,069
Likes: 0
Received 0 Likes
on
0 Posts
Hmmm, would changing from 4.1 to 4.3 make a large difference? Noticeable improvement from 0-60? 0-100? Or would i need to go higher?
I'll keep looking around. I want acceleration. I have done a lot to the motor, but i want to stay N/A and improve the acceleration.
Thanks for the responses guys.
I'll keep looking around. I want acceleration. I have done a lot to the motor, but i want to stay N/A and improve the acceleration.
Thanks for the responses guys.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post