Quote:
Originally Posted by e30gangsta
Nice #'s! Do you happen to have a picture of the timing map from your power fc tune? Who tuned it? I am unsure if powerfc has the ability to control an electronic boost controller, but if it does, you can use a mac valve to help the turbo come online sooner. ( That's what I did, but I am on Megasquirt )
As far as your cam choice, why did you pick a 260 cam? I would think a higher lift/duration cam would suit this turbo better. I run jwt s4hl's on my setup, just curious if stepping down to a less aggressive cam will help with spool.
I also had the noticeable lag, but it only happens if I am in the incorrect gear. A simple downshift usually fixes it 
Also that engine bay is super clean, nice build! |
Thanks- I do not have a pic of the ignition map, but I could probably take one of that screen on the commander(?) I usually don't mess with these things, just leave it to the pros and watch my AFRs in different phases of driving (yeah I'm lazy these days lol).
Boost controller is GReddy Profec B Spec-II. It works well. There are prolly better choices these days, but it is easy to use and I am a creature of habit lol. Had the same (like this exact same) EBC since 2006 and it has never let me down. To answer your question, I seem to remember APEXi having a boost controller that can be run with or by the PFC, but have never researched or needed it.
I am not familiar with mac valves or megasquirt. What are they? :lol:
Most recent engine rebuild was done by Jerry Yang Racing & the tune was at DBW Motorsports in Atlanta.
I chose the 260's because they are between 256 and 264, as a "compromise" if you will. At 260/12mm, it seemed like they would be suited to a range of turbocharger choices and they came in solid type profile to go along with the solid lifters. Not 'too doggy' at low rpm and not 'too crazy' in the midrange or top. This is more of a street/backroad car, with the occasional road trip, so daily-driveability was also a consideration in the build.
I think the lag is just inherent to the M8270's. This dyno sheet looks very similar to the samples posted by Tomei on their ads. It definitely sucks when not quite in the right gear lol!