Wow..... what a thread hijack.....

I have a fairly decent spreadsheet that will allow a calculation of rpm/mph reflecting converter slip and tire growth. I've verified it on the dyno and on the track. If I use 28" for the tire diameter, and do not allow for any growth (it gets worse if you consider tire growth), you are getting about 17.5% slip in the converter/tranny, which is very excessive. With a very similar application.... 28" QTP's, 3.73 gears, 128mph traps, I was getting about 10.5% slip on a brand new converter/tranny. The converter was flashing to 5K rpm at 800ft-lb.

 

My combo has ~7% slippage through the traps at 140mph. Is there any way to differentiate between the converter and the tranny slipping? I don't know of any. Is the tranny relatively new? Is it a new converter?

Rich Krause

 

The converter is brand new with maybe 40 miles on it, the tranny is somewhat new with 800 miles on it. That really sucks if I'm getting that much slipage. How much do you think I'm losing ET wise if anything. I guess if it's say 10pct total slipage more then what I should get, would that be 10pct off my horse power? so if putting down 600rwhp, I'd be losing 60rwhp?

Thanks,
Jason