mike13

iTrader: (27)

1st I did a search and lots of information but confused on what actually works for best 60' times on footbrake. What should my timing, afr's look like to get the turbo to spool off the line. Car hits hard once it's in 2nd gear but in 1st it's a dog. (2.13 60') I can only footbrake to 2K before it pushes thru the brakes. Car has T/brake but I want to maximize times on footbrake.

60' 2.14
330 5.466
1/8 7.811
mph 106.36
1000 9.988
1/4 11.448
mph 136.39
on the limiter @ 6200 ( I forgot to change the fuel cutoff by gear)

390, 83/92 turbo
3.50 , 4L80E, 3600 stall
4000lb's

MIGHTYMOUSE

iTrader: (59)

u sure you have a 3600 stall?

DrTurbo

iTrader: (3)

I 2nd that ....

mike13

iTrader: (27)

I think so, on the T/brake I've had it to 4500rpm and while driving once it's in 2nd gear it flashes to the 3600 area.

offaxis

iTrader: (19)

Are you spinning? those et`s are very slow for that mph. Ofcourse you could have a bad converter but you are picking up 30 mph on the big end so it cant be that bad..

mike13

iTrader: (27)

no, it's slow building boost.

Cam72aro

iTrader: (28)

Agreed, op, I have a 3600 circle d converter in my car and just playing around with it on almost no tune I can get about 3300 to 3500 rpms and it will build around 5psi before I try to get more then it will spin the tires. I would look into the converter first.

Tiago

iTrader: (27)

look for boost leaks.

I8UR4RD

iTrader: (16)

even with my stock brakes and a 3200 I could get 2800-3000. get some better brakes and as mentioned above look into refreshing that converter and checking for leaks.

i would also like to see how she runs with the t-brake.

mike13

iTrader: (27)

I'll do that.

mike13

iTrader: (27)

really you can get 3500 rpm on the footbrake? It must flash beyond 3600 on launch.

Cam72aro

iTrader: (28)

Havent launched it yet as the car is being finished. Fans, oil cooler, etc. This was just playing around in the drive way the other day.

mike13

iTrader: (27)

sounds like a cool build, keep me updated.

pwrtrip75

iTrader: (8)

i think your converter is way too tight. If your converter was made to stall at 3600 w/ the amount of power you have... you have to consider the more TQ an engine makes the higher the stall speed, so if your engine makes hardly any TQ out of boost its going to be tight as hell.... your 3600 might be more like a 2200.

My converter is a BTE3800, I can foot brake it up to 4200 and 11psi. Your 1st gear is lower - 2.48, I have a PG w/ a 1.80 first gear....more lag on the engine easier to build boost for me..

mike13

iTrader: (27)

It's tight on the footbrake but on T/brake I've had it to 4000+ @9lb's with the wastegate opening.

pwrtrip75

iTrader: (8)

My car on the t-brake the rpms just keep rising and wont stop. I dont think the t-brake will give you any indication at all what the converter is doing while its on.

mike13

iTrader: (27)

you converter sounds really loose if you can footbrake past the stall speed. How can you have a 3800 stall if you can footbrake past 3800rpm?

mike13

iTrader: (27)

standing back and looking at the whole package I've found a few thinks that I need to address, 1st off this is a new build so it's still being sorted.

1. I think I have a exhaust leak preturbo
2. The afr's going into boost are 11.3-11.5 I think I need to raise the afr's and bring them down as boost goes up
3. I'm thinking I need to have the converter restalled loosening it up to flash higher but also need to tighten it up on the top end. I picked up 9mph by locking the converter in 3rd gear. 127 to 136mph
4. I went out and footbraked the car and I can get 2200-2300 before it starts pushing thru

Nitroused383

iTrader: (10)

Repeat after me: the most important part of a turbo automatic car is the converter. I would only run a ptc, pro torque , ucc or fti converter in a turbo car. A good turbo converter is loose enough down low to build boost and couples hard up top to have very little slip.

mike13

iTrader: (27)

I agree, I know that many torque converter companies will tell you the turbo converter is the hardest to get right. I'm running a billet converter from the Torque Converter Shop in Lake Havasu, AZ

I appreciate all the replies