Pro Stock John

I have two bottom line q's...

1) Anyone with an 08 and the A6 trans killed a trans yet, and if so, how fast did you kill it?

2) Any of you guys running 11.5 on radials or drag radials?

Thanks, contemplating 08/A6 vs. 06/Z06...

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00 Z28 Project Pinkenstein | 10.11@133 1.45 | 11.02@121 1.55
98 Formula GT47-88 Turbo | 9.44@144 | 1.35 325-50-15 DR
02 Z06 bone stock
Pics--> www.fquick.com/ProStockJohn

Pro Stock John

Oops one more... I heard that the 07? and newer C6's have the Z06 rearend, any info on that?

Evilways

There's more than a couple of A6 guys running in the mid 11's and lower with stock A6 on DRs and some in the 11's on street tires as well. I belive Breathless performance said the A6 will give in at about 700HP, so most people don't have to worry about that. As for the rear, I thought the rear issue was only in the 05's, but I could be wrong. I personally have 12.0's consistantly(within .00X of each other) with the A6 and 450rwhp on stock tires, but that was before current tune.

Pro Stock John

Thanks, what is done to yours? How does the car shift on the street and highway, decent?

DSOMC6

I have an A6 tranny (although a 2006 not an 08) and have had zero issues with the A6 @ 557rwhp/547tq. I'm running turbos and combined with the A6 tranny it is a friggen awesome set-up.
Ultimate Porsche turbo killer!

Only issue I have had is the car accelerates faster than the computer can handle so I have to shift before 5500rpm so I don't bounce off the rev limiter. This problem has been an issue for some with just headers etc though and hopefully will eventually get worked out with a software upgrade.

I am running runflats though I'm positive if I run a sticky tire I would probably start breaking things ie: differential, shaft, etc.

Evilways

In "S" there is like 3 different ways it shifts, light throttle,mid throttle and wide open throttle all have different behaviors. WOT, the car leaps forward during each shift and hits hard, mid throttle, there's a little leap, but acts more like it has a shift kit and at light throttle, it's almost like stock. I have the L92/L76 combo and LG headers in my 06.

LS1LT1

Hey John, wish I had known you were interested in the A6s, I would've talked to ya more about it last week when we were talkin' in the Plantation Oaks hotel parking at the LSX Shootout LOL.
I too have a 2006 (not 2008) A6 but the trans has been trouble free after over 40 passes (in only stock/near stock trim of course)/thousands of miles and is a lot of fun on the street.

HITMAN99

Hey, John! Nice to see you on this Forum, hope to hear from you more often.

The A6 is pretty stout, but as was already pointed out, setting the shift points for a hi-po application can be tricky.

Whichever way you decide to go, I'm sure you'll be pleased.

glass slipper

And since you've been drag racing for a while, I'm sure you know the reputation of the Turbo 400. FYI, the Turbo 400 was renamed the 3L80 when GM went to the alpha-numeric designation for their automatics in the '80s. The "3" designates the number of forward gears, the "L" designates a longitudinal application ("T" designates transverse applications), and "80" is a relative strength rating. (They added an "E" for computer controlled transmissions in the '90s.) The 3L80 became the 4L80 when they added an overdrive gear and then 4L80E with computer controls. The A6 in the 'Vettes carry a 6L80 designation (can't remember if there is an "E" or it's implied) meaning 6 forward gears, longitudinal application with a relative strength rating of "80"...which means the 6L80 is as strong as the Turbo 400 that was designed to withstand the massive torque of the '60s/'70s big blocks. After 30+ years, GM finally gave us an automatic with some beef.

Pro Stock John

Thanks guys. It's good to see folks run so good with the stock converter. Cars must rip with the low 1st gear on a street tire.

greentank

I have around 425rwhp and my best run is a 11.79 on stock tires. I have H/C, headers, and a 3:15 rear end. The recent HP Tuners update made a huge difference in performance feel - I agree with Evilways that the car has different personalities depending on how you are pushing the throttle.

My next performance mod will probably be a 2800 converter. Then either forged bottom, or a maggie.

Oh yeah, I'm in the process of doing the rear widebody right now.

shurite44

Hi, hey where did you get the 3.15 for the A6?

greentank

I had my shop install it. Give the guys at RPM Transmissions a call - a friend of mine just went down there to have it installed there, and he's had nothing but positive things to say.

greentank

A note on shift points....

I was doing some runs at the strip - on a few, I hit the rev limiter and the car didnt shift. On others, it would shift fine. I looked at the shift points, and found that the 90+% throttle shift points were higher than the shift points on the WOT table. Meaning, I was apparently not at full throttle going down the track. This is possible, as I have a tendency to pull back a little on shifts in an attempt to avoid spinning.

I have a 3:15 rear, and changed the shift points using HP Tuners automatic calibration option. When I saw this, I looked at my original file, which has the following shift points:

@ 94% throttle 1=>2 42mph 2=>3 78mph 3-4=> 121mph
@ WOT throttle 1=>2 37mph 2=>3 72mph 3-4=> 108mph

So, even on the original tune, the shift points are higher at 94% throttle than at WOT. After my 3:15, it was a problem. I dont think I was at the track before I got my rear diff, so I dont have a comparo.

However, I will say that just in case, I bumped the shift points down on my partial throttle tables to be more in line with the WOT shifts. Havent had a rev limiter issue since.

Think I'll ask the tuning forum why this situation exists..

Cjunkie

altho im sure the A6 is a great transmission id bet a turbo 400 is stronger.

1bdasvt

I've got 510rwhp and a 3.15 H/D diff,.........no problems here!!

glass slipper

According to GM's relative strength rating, they are the same...you just might lose that bet.

At Carlisle, a tech from GM was doing a Q&A on the C5/C6 and was asked about the A6. He said it was designed to be capable of standing behind the Duramax at 650 lbs torque to the trans. He said alot of people did their best to "break" the A6 during testing including him but could not. His last comment was "you don't need to worry about the A6, it will stand".

As further proof, if you look at the torque from those old 7.4/7.5L big blocks, these new 6L and 6.2L engines have equaled/surpassed them. Remember they were rated at gross HP/torque through the '71 model year. The '71 454 (LS5) was rated at 465 LB-FT of gross torque and the same exact engine in '72 was rated at 390 LB-FT of net torque for a 75 LB-FT "loss". The highest gross rated (as far as torque is concerned) big block in the 'Vette was the '70 LS5 at 500 LB-FT...take off 75 LB-FT to arrive at 425 LB-FT net and that is about even with todays LS3 at 428 LB-FT. Todays engines aren't the only thing better than the "musclecar" days...the good ol' days were good, but they're better now.

PS GM already has a 6L90 version of this transmission which would certainly make it stronger than the old Turbo 400 according to their relative strength rating system.

Crash76

For the strength rating he is talking about stock transmissions right from the factory. Sure a current A6 and old Th400s could be the same durability/strength wise...

dont know if you could mod a current A6 like you could mod a Th400 to hold tons of power...

Main question on my mind is when is the 6L80E gonna get a transbrake!

glass slipper

That's a good question, it would be interesting to see the max limits of the A6 in modded form. It probably could be modded to hold as much as a Turbo 400, hell they can put a Hemi on a roller skate.

It seems like it would be easy to do the transbrake since everything is controlled by solenoids. Just apply first and reverse at the same time and then let go of reverse. That sounds too easy so there must be a reason it can't be done...I don't know. Any transmission experts here have an answer for that one???

Pro Stock John

Hey Marc if it's cool pm me your cell on ls1tech and I will give you a call to pick your brains. I am also wondering if you have 3.15's or 2.73's, are there optional gears?