Installed Walbro 255 along with 560 injectors. Need help tuning for 18 psi.

[EagleTalonTim]

I messed with the settings on the logger and may have messed it up. The last log was good but why run 560 injectors at 15 psi when I can run 450 injectors at 15 psi with the exact same results To me, it is like saying "I have 1150 injectors, a GT4294 and can only push 4 psi".

 

[MY1GDSM]

In my situation it is PK because I run e85 and I had the same knock at 10psi and 2g timing map(16*max) as I do at 32psi and a 1g timing map(22*max).

Sorry for getting off topic here but,
I run E85 as well... You probably do have PK BUT If I were you I would not assume that just because your running ethanol in it that your not ever getting any real knock...

 

[DJ23GSX]

Are you still on a 1g maf? Is it hacked? I had almost the same exact issues with my 1g maf on a s16g and evo 560's at anything over 16-17psi. I tried just about everything and then I changed to a 2g maf and now I'm running 22psi with 0 knock. I noticed on your logs at 18psi your mafs numbers are kinda all over the place which may indicate maf overrun. They look more consistant at 15psi.

What exactly was the issue with the 2g maf? Install trouble? Meaning you never actually tuned with it?

 

[EagleTalonTim]

I am still running the 1g MAF for now. It is not hacked....the can is, but not the actual MAF senser. I want to install the 2g but I cannot figure out how to install it and have room to put on a filter and connect the BOV to it too. The vfaq did not have any info on that either

 

[habitatguy187]

You can make it fit with a small enough filter, I'm using a 2g intake pipe too. It wasn't easy that's for sure, but it fit. As for the wiring vfaq is pretty straight forward on that, no offense but if you're having problems with that how are you going to be able to burn and socket your own chips?

Just look at the vfaq again, write out a list like, "green to red, orange to blue" and so on, neither mas has the same color wire twice, it's pretty easy.

 

[EagleTalonTim]

I have the plug already tapped in to the stock harness...the wiring is not the problem. It is the intake routing. Since this is my DD, I cannot cut up anything or modify the stock parts to where I cannot revert back if it does not work. I have installed the 2g MAF before and had it almost working except for the BOV hose.