From E6K datalog:

13B-REW
Apex'i RX6(A)
- Match ported turbine outlet
- Modified full 3" downpipe
4" downpipe back exhaust
street ports
100% throttle
11.3 - 11.8 AFR
68F
40% humidity:

RPM Boost
2500 3.1
3000 7.1
3500 9.2
4000 15.2
4500 18.0 (Boost controller regulated)

So know you know...

 

good info, but I would not run it that lean on the street IME. What are you doing for fuel? Carl

 

Hey Carl,

Thanks for the feedback!

Cosmo intank -> custom 1qt external surge tank (with return to pri tank) -> Aeromotive pump -> -10 braided pressure lines -> 550 primaries & 1660 secondaries. Needless to say, I'm not worried! ;-)

BTW, max EGT on the rear rotor measured at the manifold was 780C.

Any particulars to you opinion regard the AFR? Just curious?

 

What kind of HP are you putting down?

 

No idea on the HP, though it feels like "plenty" especially for a non-drag <track> setup. I'll have to get it on the dyno some time, I guess.

 

Either your porting is too big ( The RX6A has a tiny exhaust turbine housing. You can't flow enough air though it. I ported mine and had it Extrude honed. Stile TOO small for big HP. A big port is a waste of time) or you have some serious pressure drop though your intercooler / piping / intake. My RX6A would boost 13-15 by 3200 RPM and settle out at 14 by 6500. No boost controller only waste gate spring pressure at the time of those tests. TiAL 46mm adapted to the Apexi manifold. I also cleaned up the pipes on my exaust manifold. After my XS engineering maps were corrected ( I am lucky to have stile had a motor ) I only needed 12LBS. I had a wider torque curve and more HP. No dyno graph to prove it. If you do a search through my early posts you will find most of the info on what I had done to my setup.

 

what gear are we talking about here? 2nd? vs 3rd by "80cu"?

 

I was only running 225 tires on stock 3rd Gen rims. (You don't have to go as fast to have fun though the turns). 2nd gear massive wheel spin. 3rd gear revved too fast to check the gages and be safe on freeways so my tests were in fourth starting at 2000 RPM. I also lost pressure by not running a boost controller. The wastegate spring leaked a bit while building up to max boost. No proof just knowing from experience from other peoples rides and by the boost fluctuating between 13 to 15.
I changed my wastegate spring to 12lbs after my engine was torn apart to replace the side seals warped because of bad tunning. Adam, who is an experienced tuner from Australia, was in town installing Haltecs at the time and he re-tuned my PFC for me. He owns a very nice wide band. Adam, if you read this, thank you very much. Fuel curves and ignition curves were changed dramatically and it made a big difference. I tried to test again at 15LBS but I had too much wheel spin so I put the 12LBS spring back in until I got more rubber on the ground. Unfortunately, my car is no more and I have too much going on to pursue another 3rd Gen at this time.

https://www.rx7club.com/showthread.php?s=&threadid=285954