Hey all,

I'm having a problem with my 1990 Turbo II.
I'm running a Haltech E6k, Turbonetics T4 and 4x720cc injectors... My current arifuel ratio of 12.3 seems very rich as my fuel ecconmy is terrible at about 200kms per tank!!

The problem is, when I punch the throttle, my engine makes this crackling sound and my tach bounces and there is major power hesitation ...anyone ever seen this before?

Any help would be great!

 

sounds like detonation, be very careful as engine destruction can happen with detonation. I would check CAS wiring for any interference.

 

12.3? i hope your talking about vaccuum afr. under cruise your a/f should be about 14.7-1.... under full boost you should be anywhere from 10.8-1 12-1 (althought i think 12-1 is too lean this is what SOME guys run) You need to datalog your boost/rpm/afr with a wideband.... then you can see what is happening... chances are that your going way too rich under full boost... or too lean...