ANY input on gear selection would be appreciated!!
ANY input on gear selection would be appreciated!! trying to decide what gear to run, cant make my mind up between a 3.42 and 3.08, i'm not planning to twisting this motor pass 6500 rpms, im pretty sure im going to have back pressure problems due to ci and turbo configuration. about 50%street driving 50% strip.
single pt88-47 t4.
engine: hke 408 ci about 9.5 cr
transmission: rossler turbo 400 w-brake
converter: yank 3400
tire: 28" dr
moser 12 bolt.
car weight about 3800 lbs
im currently running a 4.10 with a posi, thanks for the help
cesar.
single pt88-47 t4.
engine: hke 408 ci about 9.5 cr
transmission: rossler turbo 400 w-brake
converter: yank 3400
tire: 28" dr
moser 12 bolt.
car weight about 3800 lbs
im currently running a 4.10 with a posi, thanks for the help
cesar.
9 Second Club
Joined: Feb 2002
Posts: 985
Likes: 7
From: Lake Orion, MI
The real question is how fast do you want to MPH with that combo? There will be some back pressure issues once you start to head north of 18-19psi but that's going to be enough to roll you thru the traps stretching the 3.42 to 6900rpm pretty easily.
The combo has the potential to run 149-157mph pretty easily. If you stay under 150mph in the quarter you can get away with the 3.42s and still cruise on the freeway around 3K rpm.
The 3.08s will let you max the combo out and still cruise the freeway around 2.7K rpm. The grunt of the 9.5:1 408ci is enough to turn the 3.08s on the street with that converter. This gear should be a bit easier to set the car up for traction at the track while loading up the turbo better as well.
I'm going to be going from a 3.5 to something in the 3-3.2 range for a simliar setup with an ST80 that's gone 149mph and moving to a PT88.
Rick
The combo has the potential to run 149-157mph pretty easily. If you stay under 150mph in the quarter you can get away with the 3.42s and still cruise on the freeway around 3K rpm.
The 3.08s will let you max the combo out and still cruise the freeway around 2.7K rpm. The grunt of the 9.5:1 408ci is enough to turn the 3.08s on the street with that converter. This gear should be a bit easier to set the car up for traction at the track while loading up the turbo better as well.
I'm going to be going from a 3.5 to something in the 3-3.2 range for a simliar setup with an ST80 that's gone 149mph and moving to a PT88.
Rick
The real question is how fast do you want to MPH with that combo? There will be some back pressure issues once you start to head north of 18-19psi but that's going to be enough to roll you thru the traps stretching the 3.42 to 6900rpm pretty easily.
The combo has the potential to run 149-157mph pretty easily. If you stay under 150mph in the quarter you can get away with the 3.42s and still cruise on the freeway around 3K rpm.
The 3.08s will let you max the combo out and still cruise the freeway around 2.7K rpm. The grunt of the 9.5:1 408ci is enough to turn the 3.08s on the street with that converter. This gear should be a bit easier to set the car up for traction at the track while loading up the turbo better as well.
I'm going to be going from a 3.5 to something in the 3-3.2 range for a simliar setup with an ST80 that's gone 149mph and moving to a PT88.
Rick
The combo has the potential to run 149-157mph pretty easily. If you stay under 150mph in the quarter you can get away with the 3.42s and still cruise on the freeway around 3K rpm.
The 3.08s will let you max the combo out and still cruise the freeway around 2.7K rpm. The grunt of the 9.5:1 408ci is enough to turn the 3.08s on the street with that converter. This gear should be a bit easier to set the car up for traction at the track while loading up the turbo better as well.
I'm going to be going from a 3.5 to something in the 3-3.2 range for a simliar setup with an ST80 that's gone 149mph and moving to a PT88.
Rick
thanks, thats the kind of answer i was looking for
