Hopefully my logic is right on this situation, here goes:
There is a vacuum line that goes to the modulator on the tranny. With a straight line the tranny shifts unbelievably high under boost. It spun to 6200 RPM before lifting on 10 PSI of boost and hit the rev limiter of 6500 RPM when we turned the boost up to 12 PSI... So apparently more boost equals later shifts. I can only imagine what would happen if we decided to turn the boost up to 30?
A friend suggested putting a check valve in the line so the modulator can only see vacuum, which didn't make sense to me. I did it anyways and sure enough the truck shifted at around 3000 RPM at WOT, way to low. I believe this was because the check valve allowed air to be sucked out of the modulator, but since no air could return, it stayed in vacuum at WOT...
Hence is my dillema. I'm leaning towards putting a valve that completely shuts off that line when we're at the track. So at the track it will always be at 0 PSI. Then we can open it up for regular driving. Is this feasable and will it work?
I heard of a conversion to TV cable as well. Anyone done this?
We will be going reverse manual valve body with a ratchet shifter when money permits, but I need a fix for the way it is now.
Thanks...
There is a vacuum line that goes to the modulator on the tranny. With a straight line the tranny shifts unbelievably high under boost. It spun to 6200 RPM before lifting on 10 PSI of boost and hit the rev limiter of 6500 RPM when we turned the boost up to 12 PSI... So apparently more boost equals later shifts. I can only imagine what would happen if we decided to turn the boost up to 30?
A friend suggested putting a check valve in the line so the modulator can only see vacuum, which didn't make sense to me. I did it anyways and sure enough the truck shifted at around 3000 RPM at WOT, way to low. I believe this was because the check valve allowed air to be sucked out of the modulator, but since no air could return, it stayed in vacuum at WOT...
Hence is my dillema. I'm leaning towards putting a valve that completely shuts off that line when we're at the track. So at the track it will always be at 0 PSI. Then we can open it up for regular driving. Is this feasable and will it work?
I heard of a conversion to TV cable as well. Anyone done this?
We will be going reverse manual valve body with a ratchet shifter when money permits, but I need a fix for the way it is now.
Thanks...