Injectors to large for decent idle?
Posted: Mon Apr 16, 2007 7:37 am
Hello,
I've been mapping an MSI with EDIS on 2ltr Turbo Zetec,
The engine spec should make 300bhp so i have used a standard set of Cosworth 4x4 injectors (330cc) running at 3bar fuel pressure.My problem is the "resolution" of the VE table and/or minimum on time of the injectors means the idle CO is around 4%, if i tune it for less at idle the engine stumbles and runs rough. (CO goes up and down)
If i fit a standard set of 2ltr zetec injectors and re-tune the engine runs better and idles around 1.5% with no problems. (just runs out of fuel on more than 7psi of boost!)
Im running open loop at all times and 4.7ohm injector resistors when using cosworth injectors (imp 2.5ohm)
I've had the same problem with big HP cosworths running Weber ECU and large injectors - anyone got any comments or suggestions?
Cheers Dale.
I've been mapping an MSI with EDIS on 2ltr Turbo Zetec,
The engine spec should make 300bhp so i have used a standard set of Cosworth 4x4 injectors (330cc) running at 3bar fuel pressure.My problem is the "resolution" of the VE table and/or minimum on time of the injectors means the idle CO is around 4%, if i tune it for less at idle the engine stumbles and runs rough. (CO goes up and down)
If i fit a standard set of 2ltr zetec injectors and re-tune the engine runs better and idles around 1.5% with no problems. (just runs out of fuel on more than 7psi of boost!)
Im running open loop at all times and 4.7ohm injector resistors when using cosworth injectors (imp 2.5ohm)
I've had the same problem with big HP cosworths running Weber ECU and large injectors - anyone got any comments or suggestions?
Cheers Dale.