HELLO GENTS I HAVE A A4 2004 GTO, IM PUTTING ON HEADERS,
PORTED THROTTLE BODY.TB BYPASS. AIR INTAKE, WIRES AND NEW PLUGS. AND A CUSTOM TUNE. WHAT CAN I DO TO THE TRANS, ITS A AUTOMATIC. IF I CHANGE THE TORQUE CONVERTER WHAT DO I GAIN FROM IT. I DONT WANT TO LOSE TORQUE. I WANT TO GAIN TORQUE AND HP. SO IS THIS THE BEST TO DO TO MY GTO. CHANGE THE TC OR CHANGE THE GEARS. AND WHATS THE BEST TO PUT IN TO IT. THANKS FOR THE HELP.

You want a higher stall converter. Like a 2800 or better, but better wait for the "experts" to chime in.....TekGto is a good source as well as Nocturn and Rob.

A torque converter simply allows for a higher stall, meaning that you will have to get the revs up to say 2000-2500 RPM before the car will get moving. This is done for better launches and stip use etc, but doesn't have a direct effect on your HP/TQ. Nothing you do to the trans really does, aside from making it more effeciant. A shiftkit is always a good way to go, gives you firmer, faster, and more powerful shifts. I would say the most imporant thing to get right is the headers, if you get primarys that are to big you will loose all your low end, get them to small and your top end will hurt.

ok so i should get a 2800 stall tc

Originally posted by ERIC_EROC@Apr 5 2005, 02:06 PM
ok so i should get a 2800 stall tc
I think that would be a good starting point.

You need at least a 3600 to get the most out of the cam. While the TC will not actually increase the HP, it will multiply your torque up until the rated stall speed. The multiplication factor (stall torque ratio) is very important because it will multiply the torque below the powerband to help get the car going until you're solidly in your powerband. After you get out of the stall of the TC you can rely on the engine to pull you through the rest of the way. Another important factor is your shift recovery RPM, with the right TC you will not drop out of the engine's powerband after shifts and the car will still be pulling like a freight train. With a 224 cam, you'll be making your best power from 3600-6700 RPM and the peak torque around 4400-4600 RPM. A big (4000+) converter is not for the faint of heart and feels "loose" if you're not used to driving with one, but for the best track results, closely match your stall speed to your torque peak. I'm stepping up to a big TC soon to get the most out of my car.