[s-cars] Re: Living at altitude - Apexi and turbos

[CaptMagu at aol.com]

Scott

I can definately understand that optomistic keyboard thing. Mance's car did
have RC 310cc injectors with an adjustable fuel pressure regulator(AFPR) that
was extremely fine tuned with some very expensive exhaust gas analyzer. He
was also running 100 octane gas for this dyno run.

He will be the last to toot his own horn but, Mr. Mike Pederson has run
something like 369 rwhp on 91 octane pump gas not corrected for squat(NCFS).
That would be with Apexi AVC Type R boost controller and AFPR. He is running
the Pederhousen Big MAF(PBMAF), Sport Q EM, and Garrett T04E 46 trim mit dual
ball bearings. Mine is a 54 trim(2 steps higher than Mike's) without the ball
bearings(just plain old sleeve bearings and 360 thrust bearing). He's also
got a slightly detuned Happersize FMIC. At his own admission he thinks that
his turbo could be a little larger. Brian Billotti just got his car running
and it was sporting the same type of turbo Mikey has but in a 50 trim size.
Word is that its back to Innovative Turbo because of an oil burn issue. I
believe someone reported that Dean Treadwell had  this same problem with his
car and this same turbo. Mike has had his back to Innovative as well for
noise problems.

If I run this larger turbo at lower PRs and feed it through a large FMIC for
relatively cool charge air temps I'm dramatically lowering the stress on my
engine. My reasons for going with the tube header is that I can use any
Garrett turbine flange and as a result have a turbine with a 3" exit port.
This will give me a true 3" turbo back exhaust. I can also mount a much
beefier wastegate(Turbosmart WG-45 ordered). The enhanced flow through the
tube header and the smoother exit of the exhaust through the 3" port and
downpipe will give me enhanced responce. I probably won't turn up the
boost;-) but I will have a lowered boost threshold.

Hap, planning away in Evergreen, Maguire