Converter/flash issue
07-03-2004, 05:15 PM
#1
Converter/flash issue Loggin the car, when it is footbraked, it will flash up to 4900, run up to around 5300 on the log, then stay there for a minute, then it resumes its normal rate of climb (like from 4900-5300)
After the shifts, it fall back to 5400 like normal and accelerates smoothly. Its just in first gear the rpm flatlines for a bit before resuming upward climb.
It is a pretty healthy cam, 27-28 degrees timing in that area, not showing knock retard.
The car was showing knock on initial converter flash but I fool with low rpm/load timing and stoppped that, but continued the stall"
After the shifts, it fall back to 5400 like normal and accelerates smoothly. Its just in first gear the rpm flatlines for a bit before resuming upward climb.
It is a pretty healthy cam, 27-28 degrees timing in that area, not showing knock retard.
The car was showing knock on initial converter flash but I fool with low rpm/load timing and stoppped that, but continued the stall"
07-08-2004, 08:11 AM
#3
Jeff:
what's your question?
When you take off in first gear (WOT launch on slicks), the motor should jump to aboput stall speed and hold stall speed until the output shaft starts to catch up. After the flash, it may even fall back a couple hundred rpms and hold that level. During this time you are getting most of the converter's ability to multiply torque. Once the car gets going around 10 - 15 mph, the motor rpms will continue to climb.
On the upshift, you should get a similar pattern. If your converter has a good shift extension, it should hold the engine rpms constant at shift extension for a few mph gain, and then the rpms will begin climbing again. Once again, during the period where there is no or little rpm gain, the converter is providing some torque multiplication.
That converter flashes pretty high and has a short shift extension for such a high flash.
Give me a call if this didn't answer your question.
what's your question?
When you take off in first gear (WOT launch on slicks), the motor should jump to aboput stall speed and hold stall speed until the output shaft starts to catch up. After the flash, it may even fall back a couple hundred rpms and hold that level. During this time you are getting most of the converter's ability to multiply torque. Once the car gets going around 10 - 15 mph, the motor rpms will continue to climb.
On the upshift, you should get a similar pattern. If your converter has a good shift extension, it should hold the engine rpms constant at shift extension for a few mph gain, and then the rpms will begin climbing again. Once again, during the period where there is no or little rpm gain, the converter is providing some torque multiplication.
That converter flashes pretty high and has a short shift extension for such a high flash.
Give me a call if this didn't answer your question.