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 shit 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?

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 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. :wavey: 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.

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

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.

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


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?

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! :Wconfused

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.

bringing back a thread from the dead...

cna someone explain gearing to me or point me in the right direction...? the lower the number = short better accelleration and worse mpg? and higher = taller slower, better mpg?

Higher number = More torque multiplication, faster acceleration, worse fuel mileage, less top speed.
Lower Number = Less torque, slower acceleration, better fuel mileage, higher top speed.

The gear ratio is simply how many times the driveline has to turn for a full rotation of the wheels. However it looks like this thread was about lowering the ratio to take advantage of the engine's powerband and stay in boost longer which could achieve better acceleration by matching the powerband alittle better.

Higher number = More torque multiplication, faster acceleration, worse fuel mileage, less top speed.
Lower Number = Less torque, slower acceleration, better fuel mileage, higher top speed.

The gear ratio is simply how many times the driveline has to turn for a full rotation of the wheels. However it looks like this thread was about lowering the ratio to take advantage of the engine's powerband and stay in boost longer which could achieve better acceleration by matching the powerband alittle better.

so.. then with the turbo, the "lower number" would be the best bet becuase it takes longer to get to a speed, but with the turbo, those problems are gone.... gotcha

so what gearing would be better on a N/A rx-8 with 6MT? for drag/ auto cross racing?

the stock 4.44 will be just fine for both..

beers :beer:

I wouldn't worry about dragging a NA RX-8, but the 4.777 final gear from Feed would probably be the best thing for putting more power to the ground in NA form.

for the money.. a shorter sidewall tire would be a better option...

beers :beer:

Higher number = More torque multiplication, faster acceleration, worse fuel mileage, less top speed.
Lower Number = Less torque, slower acceleration, better fuel mileage, higher top speed.

wait i thought the 3.90 gave worse mpg but the 4.10 get better mpg...?

wait i thought the 3.90 gave worse mpg but the 4.10 get better mpg...?

this will make it easier for you... the lower the # the lower the rpm in any given gear.

beers :beer:

basically i am looking for something to increase low end power but staying N/A. cant afford a turbo kit yet. Life of a college kid.

basically i am looking for something to increase low end power but staying N/A. cant afford a turbo kit yet. Life of a college kid.

http://www.rx8club.com/showpost.php?p=1633684&postcount=33

beers :beer:

tire size and brands?

tire size and brands?

tirerack.com...

the smaller the tire dia. the more revs per min... the stock tire is 25.9in in dia...
this is a 225 45 18


it is now a word / math problem for you...

beers :beer:

and anything else besides tires? flywheel, gears, etc..

and anything else besides tires? flywheel, gears, etc..


yes.

beers :beer:

Yes as in, smaller side wall tires, lighter flywheel and gears(4.77 the best?)? And what else besides that? As you can tell i am new to the RX-8 scene. But i have to say compared to other automotive forums i have been a member on this one is THE BEST by far.

Yes as in, smaller side wall tires, lighter flywheel and gears(4.77 the best?)? And what else besides that? As you can tell i am new to the RX-8 scene. But i have to say compared to other automotive forums i have been a member on this one is THE BEST by far.

welcome.

you need to take the time to read the stickys... it will help a lot...

i would say as a student you cannot afford the gears or the flywheel. unless you are going to put it in yourself...

read the stickys learn then ask...

if you need help finding stuff pm me..

beers :beer:

I actually work at a Ford dealership, so the install is no prob. plus discount if i go with the mazdaspeed flywheel and counter weight. thanks for the help, like wise if you or anyone else needs a technical info PM me and ill see if i cant get what you need.

Thanks,
Jay

if you get the mazdaspeed flywheel you dont need the counter weight.. if you need some tech help pm me..

and before anyone at a ford dealership works on the car ask them what a ppf is. if they dont know do not allow them to work on your clutch or transmission..

good luck..

beers :beer:

I actually work at a Ford dealership, so the install is no prob. plus discount if i go with the mazdaspeed flywheel and counter weight. thanks for the help, like wise if you or anyone else needs a technical info PM me and ill see if i cant get what you need.

Thanks,
Jay

Where can i order a 3.9 final drive for the rx8??I ve also send you and Mazmart pms cause I ll soon have a very strong engine in the box so i will sure need a 3.9 final drive..

I have your parts and have responded to your PMs.

Paul.

what mileage do you have on your car.im looking for 4.44 and i have stock 4.10 im willing to trade.BTW my car has 15k on it and no gear wine

if you get the mazdaspeed flywheel you dont need the counter weight.. if you need some tech help pm me..

and before anyone at a ford dealership works on the car ask them what a ppf is. if they dont know do not allow them to work on your clutch or transmission..

good luck..

beers :beer:

What's a ppf?

what mileage do you have on your car.im looking for 4.44 and i have stock 4.10 im willing to trade.BTW my car has 15k on it and no gear wine
Stock rear end on the RX-8 is a 4.44.

What's a ppf?
power plant frame

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?


the exact same gears from the FD3

Stock rear end on the RX-8 is a 4.44.

yeah but he has an s2k and wants to swap

yeah but he has an s2k and wants to swap
thank you :spank:

As has been stated in more than one thread, the RX8 and S2000 share nothing. The same goes for Kia or NB Miatas with RX8s. I thought it would be nice for me to clear that up again so people avoid wasting money.

Paul.

thanks for the clarification. now i can point people to this in the future

thanks for the clarification. now i can point people to this in the future

You're most welcome.

Paul.