WHAT ARE THE GEARS RATIO FOR THE RX7 FD3S AUTO?

SAME AS THE MANUAL?

I mean ,I know that the diff is 3.9 on auto and 4.1 on Manual.

BUT WHAT ARE THE GEARS RATIO FOR 1ST, 2ND,3RD...

 

wondering what the rpm will be with a 4.3 or 4.44 diff...

 

here is what I have found:
"
Automatic Transmission
Transmission R4A-EL electronically-controled,4-speed automatic
Type Torque converter and planetary-gear automatic
Torque converter Type-GDD with lockup clutch operatinr in 3rd and 4th
stall rpm 3,000
stall ratio 2.1:1
Gear ratios
1st 3.027:1
2nd 1.619:1
3rd 1.000:1
4th 0.694:1
rev 2.272:1
Final drive ratio 3.909:1 "

anyone knows how to calculate the rpm and speed with a 4.3 and 4.44 diff?

 

Visual RPM, Speed, and Gear Ratio Calculator

 

OK, you've posted like 4 threads on gear ratios lately. We've responded and helped and you haven't posted any response.

What exactly are you trying to accomplish? I think you'd be far better off letting us know what you're trying to do and people can point you in the right direction.

Dale

 

9 minutes later...



Amazing what a search can do.

 

I think he's installing a 4.44 final drive from an RX-8 into an automatic FD.

He already bought the 4.44 but is now trying to figure out why he bought it and what the benefit will be.

Specifically, he wants to know what the MPH in each gear will be once he installs it. i.e. What is gear/RPM is 70MPH? What MPH is top of 3rd? 4th?

Stuff like that. I think.........

 

yes, I plan to install the 4.44 in my rx7 fd3s manual with us transmission.

And I like to know , as Matt gold said, "What is gear/RPM is 70MPH? What MPH is top of 3rd? 4th"
for the rx7 auto ,
I don't know yet if I am going to put a 4.44 or 4.3 gear in my rx7 FD3S auto
Thanks

 

Why would you want to? First gear in the car will be almost useless. I mean hell, with the 3.90:1 you're only in it for a second or so.


With a lot of practice (and learning the best way to use the 'hold' feature), a driver can make an auto FD perform nearly identically to a manual.


Ask me how I know...

 

^This. The Hold feature allows you to select any gear you wish, manually. You can shift up & down gears with just the shifter, and you get the benefit of holding boost levels through any gear changes, as you do not need to let off the throttle for a clutch movement. A lot of people don't understand this, but it makes a well set up auto much more formidable than a lot of people realize.

 

I auto-X/Kart track race my automatic RX-8 and its basically the same automatic set-up except they put damn buttons on the steering wheel you have to avoid hitting. I have gotten much better at hand placement while flailing at the wheel.

Only issues I have with the automatic is the torque converter lock up and fade.

Even with just 108rwhp on 295 wide R888 tires I have to modulate the throttle while the torque converter is doing its thing between gears or it will catch me out when it locks and kicks the rear end out hard.

On the 5 lap runs on the kart track the fluid gets too hot and the torque converter takes foreeeeeeeeeeeeeeeeever to shift, so you are there part throttle (unless its perfectly straight section) waiting for the lock-up.

You could easily fix both these issues with a torque converter lock-up button so you KNOW when its going to lock and a more effective transmission cooler.

I do quite well on "Miata" auto-x courses where the top speeds are ~50mph as I just drive around at 47mph bumble bee-ing along on the 1st gear rev limiter steering. Engine oil cooler gets really hot doing that- gotta spritz it.