I know the RX7's ran a 4.10 in manual and 3.90 in auto. What would be the ideal gear for the RX8 with turbo instead of these dreaded 4.44?

 

Mazmart sells a 4.10 rear end for the RX-8. That would be an awesome setup to use.

 

Thanks thats the route I was looking since the 8 is a little heavier than the 7.

Is there any way to correct speedo after change?

 

I've seen many people fight over the differance of a taller/shorter for along time. Some will say its better to just wind up as fast as you can and other tend to think the longer your in gear the more you can ride the boost.
With our motor in the higher compression area, meaning it can pull its self easy w/o the turbo. I'm guessing the taller gear would win out performance wise in a drag race.
This would all depend on where the boost came in and where it died out also.

This cames from years of people fighting over a LS tranny is better then a GSR for boost.
I was also told in the past by a guy that really knew his **** that it would be better to just ride under boost then going in and out of the turbo's range.

 

is our stock ratio honestly 4.44?

 

i thought the speed sensor is on the FRONT wheels....

 

With a 6th gear I don't see why I shorter rear end wouldn't be that bad, 6th gear is pretty long and only good for highway cruising as it is.

 

Mazda gearing sixth as they did is using mechanical leverage to compensate for torque. Once you introduce boost, the torque is substantially increased and the downshift to pass situation is eliminated. However I would personally prefer a longer sixth gear in both N/A and boosted applications. JMO

 

Scott what do you think 4.10 or 3.90? I'm kinda leaning on 4.10.

 

At Mazsport we build performance packages to suit the intended use/application. Since the gearing is a very important part of the package it really depends on the power level and how the car is going to be used. Given those two choices I would in almost all cases go with the 4.10.
My FD RX-7- 4.33
My FC Turbo 2- 4.10
Keep in mind both of these cars are five speeds not six speeds.

 

Well I may be waiting on your setup. So I guess your recomending 4.10 for your setup also. I may actually get some decent fuel mileage on hwy now.

Does anyone know how to correct speedo on these cars? Maybe Rgonza will respond since he has a 3.90.

 

I think the final gear is quite alright but Mazda should have made the first 4 gears closer and leave the 5th and 6th further for cruising.

 

That's a good question where is the speed sensor?

 

Still trying to find info on correcting speedo but no luck yet!

 

Speed sensor has to be either on trans or rear end b/c if it where on front mph would not register on dyno runs.

 

http://www.ricks2k.com/products/yellowbox.php

 

speed sensor is on/in trans...

for speed correction yellowbox ftw.

there is abs speed sensors on all 4 wheels.

mazmart also sells a 3.9 by special request.

 

Is it accurate and has anyone here tried it?

 

soooo? what is our stock ratio?

 

4.44 for all 6MT and 4AT

4.3 for 6AT

 

Too bad we're not in japan, cuz I believe they use 4.7 in their Mazdaspeed Version II

Dont hit me ! but I think I like 4.7 better.

 

SO has anyone actually changed their final drive to 4.1 or 3.9? Wonder how much effect it has on acceleration (I don't mean 0-60 but rather in-gear, and overall driveability)

 

I will be ordering the 4.10 soon. I'll let you know. I think our gears are to short now. I think a 4.77 is overkill, not much range in those or drivabilty. I promise you can kiss fuel mileage away with those 4.77 and some tought fuel was bad with 4.44. I know with the 4.10 I will be able to hold 1st gear a little longer which is a good thing.

I took a ride in a FD 2 days ago that was stock with 3.90 and first gear was great. So I'm assuming RX8 w/turbo and 4.10 and being a little heavier will be very driveable with 4.10.

If you could get car to bite hard with 4.44 and not break anything w/turbo it would be interesting to see what it runs. I think Rgonza gave up with 10" slicks and 4.44. I believe this was with 13b also.

I'm still debating though on 4.10 or 3.90 b/c I don't want to pull rear down more than once. I'm so indecisive!

 

I use a 4.10 and rgonza use a 3.90, our cars really needed once we put the 20B engines.
rgonza have a better mpg than me. But I never drived a Rx8 with the Renesis and with a 4.10

manuel

 

The higher power and more torque you have, you are probably going to want taller gearing. Right now with a 4.44 final, going to a 4.1 will make a good difference. I think 4.7 would be too short for just about anything. The -8 already has very short gearing (it tops out in all gears at 9K where cars that I've driven top out around ~6K), so if you are boosted, get a 4.1.