MustangKenneBell
4th Gear Member
Joined: Nov 2007
Posts: 1,699
From:
RE: MustangKenneBell
ORIGINAL: zkiller
I have the Kenne Bell blower with an automatic. The transmission held up fine at 8 PSI but when I raised the boost to 10 PSI it killed my tranny after about 3200 miles and maybe twenty-five runs at the track.
My car is a weekend toy and I really did not beat on it on the street very often. I raced a highly-boosted STI one night and my car was pushing 165 MPH. The very next morning my transmission began slipping, overdrive light flashing and I lost third gear.
So my experience is that the 8 PSI 425-430 HP range you should be okay with stock transmission. You may have problem if you go over 450 HP.
The other thing about the stock transmission is the torque converter. The stock converter is actually a lot looser than the previous generation TQ converters but it is weak construction. It can be launched up to 2000 RPM. The problem with it is that some people with high horsepower application are seeing the converters crack. Many are also experiencing the converter unlocking at the top end. Mine was doing that once i went to 10 PSI. I upgraded to a Level 10 converter that has a billett case.
So upgrading the converter is a really good idea. Just buy a good quality one and don't go for the cheapest one (TCI ) which is just a re-worked stock converter.
I upgraded my transmission with a Level 10 Stage III 5R55S and have not had any problems since. My 0-60 time was 2.9 seconds.
I have the Kenne Bell blower with an automatic. The transmission held up fine at 8 PSI but when I raised the boost to 10 PSI it killed my tranny after about 3200 miles and maybe twenty-five runs at the track.
My car is a weekend toy and I really did not beat on it on the street very often. I raced a highly-boosted STI one night and my car was pushing 165 MPH. The very next morning my transmission began slipping, overdrive light flashing and I lost third gear.
So my experience is that the 8 PSI 425-430 HP range you should be okay with stock transmission. You may have problem if you go over 450 HP.
The other thing about the stock transmission is the torque converter. The stock converter is actually a lot looser than the previous generation TQ converters but it is weak construction. It can be launched up to 2000 RPM. The problem with it is that some people with high horsepower application are seeing the converters crack. Many are also experiencing the converter unlocking at the top end. Mine was doing that once i went to 10 PSI. I upgraded to a Level 10 converter that has a billett case.
So upgrading the converter is a really good idea. Just buy a good quality one and don't go for the cheapest one (TCI ) which is just a re-worked stock converter.
I upgraded my transmission with a Level 10 Stage III 5R55S and have not had any problems since. My 0-60 time was 2.9 seconds.
5th Gear Member
Joined: Feb 2007
Posts: 2,206
From: Tampico, Mexico
RE: MustangKenneBell
Sry but I dont have a KB blower .... not even any type of blower atm (
[&:]) I'm just based on facts of persons who have posted here andfrom tech guys.
You dont need a new TC at all, if you keep your car at 8 psi the stock one will be fine.
[&:]) I'm just based on facts of persons who have posted here andfrom tech guys.You dont need a new TC at all, if you keep your car at 8 psi the stock one will be fine.
