[toohighpsi]

Originally Posted by Turbo_RORO

Looking good. Cant wait to see this beast run. This is gonna be a good winter for the 6th gen. But I do wonder why the turbo 400 over a 4l80? Track only usage? Do you have any other pumps in the intercooling system or just the EMP out back?

Struggled with this a bunch, originally planned to go with a 4L80, but since it's a track only car (at least in Cali) the reduced losses of the TH400 seemed like the better choice. Since we'll end up with a 3.55 or 3.25 final drive it would still be OK for some limited street driving.

The EMP is the only pump we have in the system at this point, with 1" lines it should have adequate flow to the cooler, if not we'll add more pumps.

[laynlo15]

Well said Mike. Thanks for the input on all those numbers most of us don't understand.

[KingLT1]

Originally Posted by toohighpsi

We hurt the stock torque converter lockup clutch from the second gear launches during Power Tour and not paying attention to the fact that it was set to lockup at 27mph. Had I noticed this in the cal and raised it it probably would have been fine, but since we had to pull the trans we decided to go with a more robust solution.

The A8 has a couple issues in a car at higher power levels;

First it requires a significant amount of torque management during shifts to keep it alive, when you're making 5 shift changes during a pass with each shift change requiring ~0.25 sec of reduced power this becomes an impact to the performance of the vehicle. With torque management turned off the trans will be lucky to make 2-3 passes before failure. The TH400 will not require any power reduction during shifts.

Also, first gear is too low at higher power levels, while this is the reason why A8 cars perform so well in a stock / slightly modified condition, it makes traction difficult with small tires with higher power.

Makes sense....thanks for the explanation. I assumed the 8l90 was everybit as strong as a 4l80 but I guess not. How much power do you think a 8l90 can take with no TM?

[toohighpsi]

Originally Posted by KingLT1

Makes sense....thanks for the explanation. I assumed the 8l90 was everybit as strong as a 4l80 but I guess not. How much power do you think a 8l90 can take with no TM?

No idea, but much less than you think. I dropped TM off for 1 pass on our C7 corvette when it was running 10.8s to see how it would fare and it slipped pretty good on each shift. The A8 does not like full torque shifts at all.

4L80 is basically a TH400 with overdrive, so once built, they will handle anything you can throw at them. The ATI T400 MAX DUTY we're using here is rated for 1800HP and up.

Unfortunately the Camaro didn't get finished last week so no testing yet. Hopefully in the next couple weeks.

[toohighpsi]

Finally after wayyy to long - it's finally running again!

https://youtu.be/Qv_XO07DiC0

Getting a couple of the ECUs to accept the fact that there wasn't a transmission ECU anymore took a bit more time than expected, but our calibration group got it all worked out and the car works as stock with retaining the push-button start/stop.

Unfortunately wont get a chance to hit the track before SEMA, but we have a couple events on the west coast this winter to start dialing it in with the new parts.

If you happen to be going to the SEMA show and would like to see the car in person, you'll find it at the EATON booth in the Main Hall.

[laynlo15]

I can't wait to see it again. It will be my first time at SEMA, should be pretty special and long days but worth every minute of it.