What's the--SAFE---max RWHP--for the stock A6 trans & 2:56 rear end ?? THANKS !!!

 

You'll get alot of answers here. I have been running 600RWHP in mine for about 10K with no issues.

I have heard that 650-700 RWHP, expect to start having issues with the A6, although it has proven to be pretty tough in most applications.

Luckly, a few companies are starting to come out with some A6 mods.

 

I'm guessing that's 10k miles. not $?


You're right about a lot of answers but I thought 550 rwhp was the accepted safe limit, for "heavy use" anyway. Am I that far off?

Anyway, I'm sure LS1LT1, Spinmonster or TheSubfloor will come by and clarify.

 

Mine is still alive and kicking after a year with 577 hp at the rear.

 

7000 miles on my LS7 with 677rwhp and still going strong. Even stock clutch still hanging in there.

 

You have an LS7 and a clutch in front of a 6spd Auto trans?

 

oops, my bad, thought he was talking about power levels for a stock block.

 

Okay, I was hoping for a misunderstanding. Thought you might have a hot new setup. 677 whp must be sweet.

 

I think that might be in the general 'range' of what an A6 can handle but there are so many other factors/contributors to considers. With the right level/form of abuse and/or bad tuning I believe that one could blow up an A6 with only 400rwhp while another person who never races/never launches their car on sticky tires could possibly see it survive over 700rwhp.

 

Thanks, that's pretty much what I was thinking.

I guess we need a little more info from the OP about what he intends to do with HIS A6.

 

With my current mods--I have---410 RWHP----my last step is cyl heads---so i'm thinking i'm done at approx. 440 rwhp---I don't race at sanction drags---no dead stop runs----just a fast strret car !!!

 

You should be fine, might get your shift points tuned but other than that I dont think 440rwhp is anything to stress over. I had 571rwhp on my A6 for over a year before my motor blew.

 

The A6 is rated for, iirc, 460 ft/lbs. Above that, it's a crap shoot. :P

 

i broke one with less than 400 RWHP but all it turned out to be was the clutches let go. this was from racing it quite a bit pulling several 1.5-1.6 60's and my tune wasnt spot on so that hurt me also.

make sure your tune is just right and you should be fine

good luck
dicky

 

Where did you get this info ?? This is what I wanted to know---what has Chevy enginneering determined what the MAX rwhp & tq. is safe for the A6 ??? GM now has 556 hp auto behind the CTS --V series--what is that transmission ?? THANKS for all the input !!

 

I believe that is the 6L90E, we have the 6L80E in our A6 vettes.

 

IF you are just going to be street driving, there should be no problems. Drag racing with DR is simothing else. Spinning tires on the street will help longivity for trans.

 

Wouldnt put to much stock on the GM rating...just over 400rwhp and you are already touching that.

 

So what's the difference between these two ??

 

Hydra-Matic 6L80 Transmission ( MYC ) 52206
Type: six speed RWD / AWD, electronically controlled automatic overdrive transmission with torque converter clutch. Clutch-to-clutch architecture, with integral Electro / Hydraulic Controls Module
Maximum engine power: 469 bhp ( 349 kW )
Maximum engine torque: 439 lb-ft ( 595 Nm )
Maximum gearbox torque: 664 lb-ft ( 900 Nm )
Gear ratios: MYC
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: -3.06
Maximum shift speed 6500 rpm
Maximum Validated Weights: ( Target ) GVW: 8600 lb ( 3901 kg ), GCVW: 14000 lb ( 6350 kg )
7-position quadrant: P, R, N, D, X, X, X ( X = available calibratable range position )
Case description: 3-piece ( Bell, main, extension )
Case material: die cast aluminum
Shift pattern: (2) Three-way on/off solenoids
Shift quality: Five variable bleed solenoid
Torque converter clutch: Variable Bleed Solenoid ECCC
Converter size: 300mm ( reference )
Fluid type: DEXRON© VI
Fluid capacity: w/ 258 & 300mm converter 258mm: 9.7L ( 8.22kg ), 300mm: 11.9L ( 10.1kg )
Transmission weight: w/ 258 & 300mm converter 258mm: Wet: 94-96kg ( 207-211lb )
300mm: Wet: 102-104kg ( 225-229lb )
Pressure taps available: line pressure
Assembly Site: GMPT Ypsilanti, MI
Applications: Chevrolet Corvette
Cadillac XLR
Cadillac XLRV
Cadillac STSV
GMC Yukon Denali
GMC Yukon Denali XL
Cadillac Escalade
Cadillac Escalade ESV
Cadillac Escalade EXT
Holden Commodore
Holden Statesman


There ya go.

and just for fun.....


Hydra-Matic 6L90 Transmission ( MYD ) 71706
Type: six speed RWD / AWD, electronically controlled automatic overdrive transmission with torque converter clutch. Clutch-to-clutch architecture, with integral Electro / Hydraulic Controls Module
Maximum engine power: 452 bhp ( 337 kW ), Diesel: 300bhp ( 223kW )
Maximum engine torque: 531 lb-ft ( 720 Nm ), Diesel: 520 lb-ft ( 705 Nm )
Maximum gearbox torque: 885 lb-ft ( 1200 Nm )
Gear ratios: MYD
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: -3.06

note the difference in hp/tq ratings....