View Single Post
WERK I WERK I is offline
Forced Induction Junkie
WERK I's Avatar
Join Date: Jan 2003
Location: Wisconsin
Posts: 3,291
Thanks for posting the graphs on your 930. You haven't commented on the numbers but here's a couple of things that are pretty obvious at first glance;

1.) You're pig rich at boost onset. Starts at 12.2-12.4 AFR and then plummets to 10.0 AFR @ 3000RPM....boost onset? It does recover by the time it reaches 6000RPM, but is still a little low (11.5 AFR), IMHO. It would be interesting to find out if the overshoot in the AFR's is due to the info plugged into the tables, by the tuner, or is it an issue of latency in the DWUR.

2.) Calculating for drivetrain losses of 15%, it comes out to 364.5BHP, which to me seems about right based on your build, unless you changed your cams, but I don't see them mentioned above. Cutting over to SC or 964 type cams can add an additional ~30BHP.

Again, thanks for sharing. Cheers.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 04-25-2010, 04:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #34 (permalink)