T-56 to TH400 HP Tuner?
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From: Joplin, Missouri
T-56 to TH400 HP Tuner? OK I just got my th-400 installed into the car and I was wondering what I need to tune. The cars idle seems to be to low and it likes to die when I am in drive or stopping at a stop sign. Also the speedo is way off it says I'm going 150 when I am doing about 45. Also I deleted the ABS is there a way I can tune it to get the light to go off?
Your torque converter is heavier than the M6 flywheel so you probably need to change your idle airflow table. Log your LTIT and STIT and make the needed changes.
The speedo is off becuase the speed sensor values are different on different transmissions. You can either flash the correct value into the VSS table or you can compute a rear gear ratio that cures the error. When I swapped from a 4l60 to t56, EDIT wouldn't change the VSS counts so I told it that I have a 1.57 rear gear (instead of my 3.73s) and it works fine. I don't know if the TH400 uses the same VSS counts as a 4L60. If it does, you can use my factor to get you close. (157/373 * current ratio = new ratio)
I have HPT now, but have not tried to update the VSS tables.
The speedo is off becuase the speed sensor values are different on different transmissions. You can either flash the correct value into the VSS table or you can compute a rear gear ratio that cures the error. When I swapped from a 4l60 to t56, EDIT wouldn't change the VSS counts so I told it that I have a 1.57 rear gear (instead of my 3.73s) and it works fine. I don't know if the TH400 uses the same VSS counts as a 4L60. If it does, you can use my factor to get you close. (157/373 * current ratio = new ratio)
I have HPT now, but have not tried to update the VSS tables.
Thread Starter
10 Second Club
iTrader: (11)
Joined: Dec 2003
Posts: 795
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From: Joplin, Missouri
Originally Posted by bmfcamaro
how hard was that conversion? how much if you dont mind me asking. i might look into this in the future.
I probally spent a little over $2500. 
