Converter Issues
Converter Issues Hi guys, Ive been chasing this issue trying to figure it out. I went ahead and pulled my converter, convinced that it was just too loose. A friend of mine with a decently heavy S-10 running 8.60's brought his Hughes 10" converter over for me to try.
Neither of us are 'in the know' when it comes to transmissions or converters, so we just did some experimenting based on what we think.
Our assumption is that stall speed is a function of torque, his 406(SBC) make 650 ftlbs of torque N/A at 5100 rpm and gobs more on the spray. His Hughes converter stalled to 4700 on a transbrake with that motor. We swapped it into my car to try and it stalled to 6000rpm
There's no way Im making that much more torque than him, and our vehicle weights are really close with his being a bit lighter.
The Precision 9.5" converter we just pulled was supposed to be setup for the car and supposed to stall at 4000. On the trans brake we saw it hit the rev limiter at 6500 with almost no effort, not even WOT.
On the foot brake, the vigilante converter would allow 3000 or so rpms, the same as this Hughes converter.
Since the foot brake stall speed seems to be 'right' we cant even imagine why it would be blowing through these converters so hard.
So Im looking for any and all input you guys might wanna throw out there before I send this converter back to Precision for a re-stall.
Could there be something wrong internally with the transmission to cause me to miss my stall speed by 2000-2500 rpm?
Or is it just flat out burning through the converter? On the track it seemed to be slipping exessively at the big end with trans temps continuosly rising as I reach the traps.
Ive got a call into the transmission shop to see what they have to say, and this dude Jack at precision was less than helpful on the phone. He didnt want to talk to me untill I sent it in, but Id rather talk first and be comfortable that the re-stall is gonna stop these issues before I send it
So lets hear it guys, do you think the problem is soley in the converter being WAAAAY to loose, or what? If Im leaving out any important info, ask and I will answer to the best of my ability.
Neither of us are 'in the know' when it comes to transmissions or converters, so we just did some experimenting based on what we think.
Our assumption is that stall speed is a function of torque, his 406(SBC) make 650 ftlbs of torque N/A at 5100 rpm and gobs more on the spray. His Hughes converter stalled to 4700 on a transbrake with that motor. We swapped it into my car to try and it stalled to 6000rpm
There's no way Im making that much more torque than him, and our vehicle weights are really close with his being a bit lighter.The Precision 9.5" converter we just pulled was supposed to be setup for the car and supposed to stall at 4000. On the trans brake we saw it hit the rev limiter at 6500 with almost no effort, not even WOT.
On the foot brake, the vigilante converter would allow 3000 or so rpms, the same as this Hughes converter.
Since the foot brake stall speed seems to be 'right' we cant even imagine why it would be blowing through these converters so hard.
So Im looking for any and all input you guys might wanna throw out there before I send this converter back to Precision for a re-stall.
Could there be something wrong internally with the transmission to cause me to miss my stall speed by 2000-2500 rpm?
Or is it just flat out burning through the converter? On the track it seemed to be slipping exessively at the big end with trans temps continuosly rising as I reach the traps.
Ive got a call into the transmission shop to see what they have to say, and this dude Jack at precision was less than helpful on the phone. He didnt want to talk to me untill I sent it in, but Id rather talk first and be comfortable that the re-stall is gonna stop these issues before I send it
So lets hear it guys, do you think the problem is soley in the converter being WAAAAY to loose, or what? If Im leaving out any important info, ask and I will answer to the best of my ability.
