th400 revs slow past 5500-6000
08-15-2009, 05:30 PM
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th400 revs slow past 5500-6000 car is a SS 2002 camaro, th400 trans, moser rear. turbo setup making 800hp roughly. here is a log in a first gear take off. the car flashes and pulls but then has very little power above 5500. the injectors go flat also. here is the log
08-15-2009, 09:45 PM
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lowered the boost to 10psi and it seemed to pull better, went up to 17 and it didnt want to pull past 6k, valve float?
injectors go flat, rpms slowly climb, a/f 11.5 perfect, timing 17*,
injectors go flat, rpms slowly climb, a/f 11.5 perfect, timing 17*,
08-16-2009, 05:36 PM
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i also hit the trans brake and it will stall to 5k or higher if i like. it usually only went to 3k at best. does that mean the converters shot also?
jakeshoe-thank you for the info. have you seen this often?
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08-17-2009, 04:25 PM
#9
I can't diagnose your car on the internet. You COULD have weak valve springs, tuning issues, fuel delivery problems, etc.
However I will say this,
if it only does it in 1st gear, it's not likely any of the above and is very likely the trans.
A fuel delivery problem will show up in 3rd gear not 1st, tuning issue would usually be across the gear ranges, as well a weak valve springs.
I build GM automatics exclusively for performance use. It sounds like an amateur built your TH400.
However I will say this,
if it only does it in 1st gear, it's not likely any of the above and is very likely the trans.
A fuel delivery problem will show up in 3rd gear not 1st, tuning issue would usually be across the gear ranges, as well a weak valve springs.
I build GM automatics exclusively for performance use. It sounds like an amateur built your TH400.
08-17-2009, 08:53 PM
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i dont think its tuning issues. i put my old tune back in and it still did it. the converter is getting sent off, so is the trans, at least ill be able to rule those out. i took a look at the valve springs and they looked normal. will the plugs show any signs of valve spring issues?
