cpt_koolbeenz

You really do need to run that WG in dual port mode... The LR unit is basically the same as the stock unit in single port mode.

DDP

Would a 50 trim T04B be too large to run with a 6 hotside?

cpt_koolbeenz

My advice would be to not run with the #6 hot side at all... That wheel creates too much back pressure at higher RPM's. If you do anything other than stock (ie. want more HP) then don't use a #6 wheel. #6 wheel is very streetable with the stock KKK turbo, but for larger power applications, it is impractical.

GPF

Bugger.....

Well I do still have the k26/8, but I don't know what condition the turbine is in. ( I do know what condition the bearings and seals are though! )

Anyway, I really can't see me pulling the turbo and getting it rebuilt with a #8 just yet. Would a 3" downpipe and front section help with the back pressure? Again, not something I was planning on just yet, but it's on the never ending list...

Regards

Graham

'88 Turbo S

kasturbo

Don't know if this helps or not. I had my B upgraded to a .57 trim and within two months I had blown up the center section. I believe the problem was back pressure. I had the hotside upgraded to a #8 and now the car feels much stonger as if it was opened up in the top end. There is a lot less back pressure. Spoolup is comparable to your k26/8.

You can measure your back pressure by routing a hose off of the factory test tube that is tapped into the crossover pipe. Just plug in a pressure guage. Ideal back pressure would be a 1:1 ratio, but a few pounds off isn't bad.

Kool

I just got off the phone with Tim at SFR.

His stage 1 turbo is a 50 trim compressor and a #8 hotside.

Just wanted to clarify.

J Chen

There also the possibility of a partialy collaspe
down pipe or partialy block cat.
Also double check that you've got a 1 bar spring
in the wastegate.