Quote:
Originally Posted by Tapani
:-)
First I will come up with a setup to measure both inlet and exhaust pressure and temperature and map these against air mass flow. Then try to define the design envelope for the most efficient ball bearing twinscroll candidates.
Do not wait for results very soon, though 
Kind regards,
Tapani |
EG33 have one bank firing cylinders 240' apart. The EJ2X turbo has one bank firing 180' apart (1 4 2 3) and the stock header for the EJ2X is near identical to the EG33 header and is what Perrin copied and what I also did. EJ2X header is good for 100 bhp per cylinder before the pulses create to much of a restriction. Means the EG33 is good for about 600 bhp theoretically before the stock headers become a restriction. I saw 580 odd bhp but the cams were the issue. Now cams fixed I expect it will hit 600 bhp no problems at 6500-7000 rpm.
All EJ2X turbos have always been greater than 1.5:1 exhaust to inlet pressure ratio. VF34P20, one of the best turbos available for the EJ207 is around 2:1 at 20psi when you push the boost up to 18-20 psi like what pretty much every second WRX owner does.
It's only when you stick a big turbo say GT35R on the 2.5L engine when you see 1:1 pressure ratios.