View Single Post
Flieger Flieger is offline
Max Sluiter
Flieger's Avatar
Join Date: Mar 2006
Location: So Cal
Posts: 19,574
I think you mean Ansa, or maybe Dansk.

If the pump is not tuned to the muffler, incorrect fuel mixture can result through the rev range as the tuning of the muffler takes effect on volumetric efficiency through scavenging. The change in VE dynamics and stoichiometry is not equal across the rev range so the space cam should actually have a different profile to correct the fuel/air mixture. This is why MFI is hard to do when you stray far from standard Porsche setups. If the space cam is wrong, then you will only be able to tune the engine to run well at one rpm band. This sounds like how you can get the idle better with popping elsewhere or you can get it to run strong up top but idle high.
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance

Last edited by Flieger; 07-03-2010 at 12:21 AM..
Old 07-02-2010, 09:09 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #70 (permalink)