New transaxles for SLC?

[Jack]

Guess I really got lucky!
There is a 930 LSD and a 996 gearbox on fleabay right now for a good price.

 

[Patrick]

Has anyone found out the gear ratios and ring and pinion ratio for this new gearbox?

 

[Fran Hall RCR]

They are readily available...

just check out the V8 and the V10 R8...come on guys I am doing all the hard work here....most manufacturers leave you to have just one transaxle choice....wink.

I am at least pioneering a new package, just like I did with the Ricardo way before anyone else figured out how good the trans was...same goes for this package..

 

[James]

I found these ratios online


gear - ratio/overall ratio/(rpm) mph
-----------V10-------------
1st - 4.37/13.46/(8700) 48
2nd - 2.71/8.35/(8700) 77
3rd - 1.93/5.94/(8700) 109
4th - 1.50/4.62/(8700) 140
5th - 1.24/3.82/(8700) 169
6th - 1.04/3.20/est (8400) 196

Final drive ratio: 3.08
-----------V8-------------
1st - 4.37/15.13/(8250) 41
2nd - 2.71/9.37/(8250) 66
3rd - 1.88/6.50/(8250) 95
4th - 1.41/4.88/(8,000) 123
5th - 1.13/3.90/(8000) 154
6th - 0.93/3.21/(8000) 187 * drag limited

Final Drive Ratio - 3.46

 

[James]

I was looking at the ratios, they might be a little short for a big V8, you're hitting about 2500rpm @60mph in 6th. Even 6th gear is not a true overdrive because it's ratio is still greater than 1. If I am wrong, please let me know.

I wonder if it is possible, (or at least cost effective) to replace the ring gear/final drive with something around 2.5 or maybe a little taller.

 

[Eric A.]

What sort of shifter is used with these transaxles? Are they an H pattern with a cable shift?

 

[Fran Hall RCR]

H pattern cable shift....part of the SLC deluxe plus kit, just like any other available transaxle choice for the SLC

 

[Michael]

I found these ratios online


gear - ratio/overall ratio/(rpm) mph
-----------V10-------------
1st - 4.37/13.46/(8700) 48
2nd - 2.71/8.35/(8700) 77
3rd - 1.93/5.94/(8700) 109
4th - 1.50/4.62/(8700) 140
5th - 1.24/3.82/(8700) 169
6th - 1.04/3.20/est (8400) 196

Final drive ratio: 3.08
-----------V8-------------
1st - 4.37/15.13/(8250) 41
2nd - 2.71/9.37/(8250) 66
3rd - 1.88/6.50/(8250) 95
4th - 1.41/4.88/(8,000) 123
5th - 1.13/3.90/(8000) 154
6th - 0.93/3.21/(8000) 187 * drag limited

Final Drive Ratio - 3.46

The speeds "per gear range" are shown relevant to RPM... But I don't know of too many LS2,3,7, or 9 engines that will intentionally spin up to 8700 RPM's and not spray engine parts across the pavement.

So with engines that max out in the 6500 to 7000 range, what do these speeds compute to?

I do think that this would make an excellent gearbox for the LS engines, but I think that the top end speeds are going to be slightly lower than shown.

Mike

 

[Fran Hall RCR]

You could always just use he R8 or Gallardo engine , problem solved

 

[James]

The speeds "per gear range" are shown relevant to RPM... But I don't know of too many LS2,3,7, or 9 engines that will intentionally spin up to 8700 RPM's and not spray engine parts across the pavement.

Mike

:laugh::laugh::laugh::laugh::laugh:

LMAO,, I'm imagining an engine literally spraying engine parts all down the road (like cartoonish)...

I just copy and pasted those off from the R8 specs, I didn't calculate the engine speeds.

 

[Dave]

Gazanio v8 vs. v10
Many R8 guys complain of not having enough gear...in any gear. The Lambo GBox has better gearing.

 

[Mike]

Gear-speed-tire-rpm figures -- pics attached

 

[Fran Hall RCR]

6400rpm...??...LS7's run to 7300rpm.

 

[Dave]

Haha. I set mine to 6500 rpm too. I assume those boat anchors couldn't rev any higher...wut do i know, I'm a rotary guy :shrug:

 

[Jack]

deleted...

 

[Mike]

6400rpm...??...LS7's run to 7300rpm.

That's around town in stop & go traffic....

 

[Dave]

Updated for 7300 rpm

 

[Fran Hall RCR]

Tire diameter for a 325/30/19 which is the SLC standard rear is 26.7 inches ....

 

[Dave]

Updated to 325/30/19...didn't know that was the new standard. I am running 335/30/18.

Also eliminated tire slip that was set to 3%. This latest graph will show the absolute highest figures but will be pure theoretical though without tire slip factored into it.

 

[James]

Are any of the gears interchangeable with other Audi transmissions? If so there other transmissions by Audi that have some better gear ratios. Yes, I realize it's a completely different transmission, but maybe some of the parts, (esp gears), might be interchangable.