according to the calcuations (rpm x msec/1200) my injectors duty cycle is at 146% at 4034 RPMs and i have no knock

but once i hit 5000 RPMs i get 7 knock and my duty cycle becomes 90%

here is the msecs i have...

4034 RPMs = 32.46 (0 knock) (109%)
4907 RPMs = 33.26 (0 knock) (136%)
5304 RPMs = 19.1 ( 5.96 knock) (84.42%)
5585 RPMs = 18.65 (7 knock) (87%)

what the hell is going on?

why is my car giving less fuel uptop? obviously the pump/injectors are doing fine before 5000, (i mean putting out full pressure, which i know isnt good, but still not making me run lean) and as soon as i hit 5000 i get low inj pulse/duty cycle...

i popped a code saying maf is getting too high of a voltage or something from the DTC... so i'm thinking the MAF is maxing out which is causing it to give less fuel (but i thought once it maxes out, it dumps the fuel, not give less)

what do u all think is going on?

this is a turbo car btw... on 6psi

 

nobody?

is this too techincal of a question or something?

 

What kind of turbo kit do you have? unrelated question...

 

STS rear turbo

god i love this thing ,i dont care what anybody says, this thing is the shiet

hope the thread dosnt get hijacked now

 

What's the actual DTC?

How did you address the issue of running theturbo with the 1bar MAP sensor?

Who tuned it?

What does this mean... it is not very clear?