I may have figured out my detonation and lean AFR problem.....
 

For those that don't know I ran 3 times at Steele and had to let off at 1100' for detonation one time and lean AFR twice. (tried 3 different tunes).

Well I just found out that the fuel pump that I installed was not a SVT Focus pump, it was a regular Focus pump. So I am running a 381.5 rwhp motor on a 90 rwhp pump. Does anyone hear think that might be my problem??

Re: I may have figured out my detnation and lean AFR problem.....
 

I had a guy who WORKS the parts dept at a Ford dealership try to tell me that all focus pumps were the same.

Re: I may have figured out my detnation and lean AFR problem.....
 

by the way, could you see your fuel pressure when making those runs?

Re: I may have figured out my detnation and lean AFR problem.....
 

If that's your problem then you should've seen a drop in fuel pressure.

Re: I may have figured out my detnation and lean AFR problem.....
 

When you figure out the detonation problem, let me know too!

Re: I may have figured out my detnation and lean AFR problem.....
 

I don't have a FP gauge, AFR was fluctuating back and forth from 12 to 12.9.
This is from the Ford Parts "Guru" on Modular Depot:


ME:

ANSWER:

Re: I may have figured out my detnation and lean AFR problem.....
 

:eek:

Re: I may have figured out my detnation and lean AFR problem.....
 

:werd:

It would scare me just seeing the a/f run at 12:0. :shake:

Re: I may have figured out my detnation and lean AFR problem.....
 

Did you get yours from MPH??

Re: I may have figured out my detnation and lean AFR problem.....
 

NO, you probably have the right one.