redgs4

I have used an ATS Carbon clutch type LSD [stock gearing] for about two years and recently switched to a 3.76 Torsen. I did not get the massive performance improvement I had hoped but I definitely notice the gearing change in my day to day driving - I'm always a gear off from where I manually shifted before.

What I did notice is I get less wheelspin now. With the ATS I always drove with the traction control OFF because I found it intruded in my day to day driving. With the Torsen I have found that I can drive with the traction control ON and still have some fun without power being cut.

And for those wondering about my ATS - it's not for sale.

rominl

iTrader: (4)

interesting. i thought wih the 3.76 you can get wheel spin off the line more easily?

redgs4

I could spin at will with the ATS. I can spin at will with the 3.76. Difference is mainly in applying power through the corners - the 3.76 seems less apt to break traction.

TLW

so which do you recommend

rominl

iTrader: (4)

so you are saying that the 3.76 is distributing power better so less easy to spin at corners?

redgs4

Supercharged I would go with the stock gearing. NA I will stick with the 3.76.

redgs4

Yes. But with either you can spin when you stomp on the gas.

rominl

iTrader: (4)

that would be my choice too. given how fast my car rev up now with the 3.76, i can only imagine the fi

cacrawfo

Changing final drive ratio with a gearing change will DEFINITELY affect the accuracy of the speedometer. The VSS measures output shaft speed, so any change downstream will affect speedo reading.... I.E. different tire OD, or final drive change...

Carl c

FutureGS400

Speaking from personal experience, the gearing change on our cars does not affect the speedo readings. I have done gear swaps on other vehicles that DID affect the speedo and needed to change the speedo drive gear to compensate. Changing the tire O.D. will affect the speedo however...

rominl

iTrader: (4)

changing the final drive ratio, yes, for sure. my gs4 is constantly showing "slower" speed than what i am really doing.

but changing the differential unit from open to trd, i dont' see how that will affect it?

jmecbr900

I'm using the TRD LSD and have been for a while. Every once in a while I bounce off the rev-limiter in the 1-2 shift. Not often. If I did anything different, I would get my TC out and drop the stall speed to the 2400. Other than that, no complaints. I like the fact that I still retained stock gearing. No complaints from me at all.

FutureGS400

Henry, you're running 20s on your car, correct? That would be the reason your speedo is slightly "slow" compared to actual speed. This would be true to some degree with a "fat" 19 set up, although perhaps not as much. The taller O.D. of the tire will cause this effect.
The 3.76 gearing though would cause the speedo to show a "faster" speed if it had any effect at all. But that's not what happens. Anybody who has done the gear swap knows about how much the rpms increase at a given speed (approx. 300 rpm or so). Speedo accuracy is not changed.
The NAV system is not affected by the gear swap for the same reasons...

rominl

iTrader: (4)

oh man, sorry, brain farts.... i apologize, no clue what i was thinking. the 3.76 wouldn't change the speed at all. and yes, my 20s is the reason why my speedo is off @_@

cacrawfo

NAV system uses GPS and dead reconing. The dead reconing is from the ABS individual wheels sensors, so only a tire OD change will affect that... and even then it probably re-calibrates itself to jive with the GPS readings.....