EFR9180 748rwhp 558KW
That's entirely true. We hit 603rwhp on my car with the .92( backed up on a 2nd dyno also), and forcefed racing has hit a little over 600rwhp on 2 of our cast kits..
Rotary Enthusiast
Joined: Mar 2001
Posts: 761
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From: Walnut, CA
on another note, since you guys have run e85 in racing condition high hp engine for a long time, what kind of premix oil do you use? many premix oil seem to not mix so well with e85, and I've heard concerns about increased rotor housing wear.
Very interesting.
If you look at the bottom of the charts where it shows the boost trace.
With the larger 1.45AR the peak boost per rpm available was 2psi higher from 2,900-3,500rpm (84-102kph) where it started to taper.
The larger exhaust housing let the turbo spool faster?
Or was there a change in boost control (WG duty cycle tuning) to do this between the dynos?
If no change in boost control, only thing I can think of is that because the 9180 is surge limited in regards to spool the engine VE being greater with the larger exhaust housing shifted where the engine was operating relative to the compressor surge line over to the Left (higher flow) region allowing higher pressure ratio.
2,900-3,500rpm does seem to be the rpm region these turbos are surging on 13B...
Note: Turbo response (how quickly the turbo achieves maximum boost available per rpm) is different from spool and is not represented on a dyno chart.
If you look at the bottom of the charts where it shows the boost trace.
With the larger 1.45AR the peak boost per rpm available was 2psi higher from 2,900-3,500rpm (84-102kph) where it started to taper.
The larger exhaust housing let the turbo spool faster?
Or was there a change in boost control (WG duty cycle tuning) to do this between the dynos?
If no change in boost control, only thing I can think of is that because the 9180 is surge limited in regards to spool the engine VE being greater with the larger exhaust housing shifted where the engine was operating relative to the compressor surge line over to the Left (higher flow) region allowing higher pressure ratio.
2,900-3,500rpm does seem to be the rpm region these turbos are surging on 13B...
Note: Turbo response (how quickly the turbo achieves maximum boost available per rpm) is different from spool and is not represented on a dyno chart.
I ended up having to tweak my open-loop boost control values because of surge in 4/5th gear on the highway. The values I'd use to get maximum response in the lower gears would cause surge at partial or full throttle under ~4000 rpm in 5th if it made over ~20psi. I had to pull some boost control %DC out in those areas which ultimately softened up boost response in lower gears. Closed loop would have worked fine since I could have targeted less than 20psi at the RPMs that surge. Setting up accurate boost control initial values for closed loop is nearly impossible with the IWG boost creep I had, though. Boost values with open loop would be different day-to-day and gear-to-gear.