Converter talk on a turbo car.
10-14-2012, 09:33 AM
#1
Converter talk on a turbo car. My setup is listed in my signature. Converter is a Cameron converter and I can have it tightened up if needs to be done.
Question is how to tell when the converter is too loose? What would be optimal?
So last night we were out tuning the car with the new setup logging it with EFI live. This is what I saw on the log.
Foot braked the car to 3500 on the line, left and cut a 1.42 60. Shifted to second gear at 6527RPM and the log shows it going down to 5987. Shifted from second to third at 6492 rpm dropped to 6243rpm. The second to third has got me worried.
We only got two passes in last night first pass we forgot to turn on the wideband so it was pretty much worthless, second pass was at 10 psi then the track shut down. We are heading back out tonight but I am worried as the boost goes up the car is going to blow through converter even worse.
Question is how to tell when the converter is too loose? What would be optimal?
So last night we were out tuning the car with the new setup logging it with EFI live. This is what I saw on the log.
Foot braked the car to 3500 on the line, left and cut a 1.42 60. Shifted to second gear at 6527RPM and the log shows it going down to 5987. Shifted from second to third at 6492 rpm dropped to 6243rpm. The second to third has got me worried.
We only got two passes in last night first pass we forgot to turn on the wideband so it was pretty much worthless, second pass was at 10 psi then the track shut down. We are heading back out tonight but I am worried as the boost goes up the car is going to blow through converter even worse.
10-28-2012, 05:03 AM
#4
The RPM drop on the 2-3 shift is the most telling on how a converter is working in YOUR car. Everything is taken into account. Weight, gearing, tires, HP, torque curve.... And looks like you are dropping about 250 RPM. That is already on the loose side and you have more power to throw at it. I think you need to get it tightened up. And turbo cars are the hardest to build for converter wise, the power can come on so strong.
Chris
Chris
10-28-2012, 09:22 AM
#5
what worked best for me when I had a turbo LS was a 3600 stall with a 1.8 STR. Really locked up up top and dropping the STR from 2.3 to 1.8 didnt affect the launch, just was able to leave with more power. This actually helped traction considerably and the power was in much earlier in the run giving a quicker 330' time
Do you happen to know what the STR is in that converter?
Do you happen to know what the STR is in that converter?
11-13-2012, 11:53 AM
#7
stall ratio. the number that dictates torque multiplication. higher number will put more power down initially and slip up top generally. lower number will put less down early and lockup more up top.
Generally a low STR is good for small tire and poor track prep, its easier to hook and will MPH better
Generally a low STR is good for small tire and poor track prep, its easier to hook and will MPH better
