Exhaust manifold design

[RICE RACING]

Originally Posted by Libor

Or PT6466.
Sound Performance tested back to back 6466 against 6766 at same boost level (36 psi) on stock 2JZ. 6466 has significantly better spool-up and due to higher efficiency at these exact conditions (boost and flow level) it also produced higher peak power and torque. Both compressors have capability to flow over 90 lbs/min of air, which is enough for over 700 HP even on rotary platform.

BorgWarner EFR serie is very nice on the paper and some people are reporting very good transient response which is expectable thanks to very light rotating assembly, but Precision seems to be few steps forward, at least in aerodynamics of wheels itself.

Then again, Precision doesn't bother with some burst testing or maps at all But they have results like no one

I was going to post that for him but I did not for this reason.

The smaller compressor wheels heat up the air more in the 22psi + range especially when fitted to a rotary engine, thus I recommend the 67mm compressor (lots of experience running these at high boost) so its better for your engine basically, even at lower power levels, remember a wankel still munches a shit load of air! it just does not make the best use of it (IE power generation).

Go the 6766 mate, you will not regret it, absolute **** loads of them on E-Gay, to your door cheap as! will make the power and will be reliable, I witnessed that GTR getting rapped for two days straight, and before that its done allot of work, on just one turbo, no smoke, no snapped shafts, no excuses.

[RICE RACING]

Actually ................ Try a 64mm if you like, I have not been bothered to do it myself, I'd be interested to see what you find when you fit it to a 13B and run 30psi boost like we do on the bigger compressor.

Look at my website and you will see I made ~500rwhp in 1997 on a 58m compressor H Trim Garrett T04! fitted with my water injection system.

These new turbo's are a light year in advance of that old shit I ran back then.

100% I say to you stick to the T04 platform, its the perfect turbo for the street, compact, massive power, BEST POWER BAND, and they just work.