S2KPANG

This is an odd one. Neeman made 600+whp and trapped 135+ with the same setup (turbo, manifold).

Good work none the less!

siadam

His wasn't a 9.1 motor I don't believe.

neeman77

Yes my motor was a 9:1 Inline block, I was having some trouble with backpressure though as well. I did upgrade my compressor to the precision 62mm billet wheel though.

tony1

Regardless, as you can see by the dyno sheets, the spool is damn near identical, so even if there was only 40hp difference, it still doesn't make sense to do the divided housing on this turbo.

jaundice

I do have a divided T4 1.06 GT35 exhaust housing for sale......

timg

The RX-7 guys ran into issues with the divided T4 GT35R turbine housings. One of the companies (A-Spec) offered a 1.06 housing that was said to be custom and much larger and less restrictive than the other options. That may be worth looking into for anyone having problems.

Tim

YuriArts

Good question... i'm having mine tuned in a few weeks and would like more info on that matter if possible.
If I don't get to 600whp i'll let you know.

My engine is at 9.5:1 with Darton sleeves, fully built head as well, AP1 cams, 2.2l displacement (AP2 crank)

jaundice

The best I could figure out was that at 2.0 liters at 9:1 compression and AP1 cams, my exhaust pressures were high. The divided just couldn't flow fast enough. JoeyBalls has an AP2 with AP2 cams. Good luck with your tune. I'll be interested to see how you do.

YuriArts

me too, basically an AP2 with AP1 cams.

We're dynoing it on an engine dyno so we can also measure the backpressure

jaundice

Excellent. That was the one thing we couldn't do. I did not have a pressure bung in my exhaust housing.