I installed the BM (modshack)yesterday along with all the other stuff (4bar, etc..), and I started to immediately have detonation issues, no matter how much or little the boost was turned up..and I know this isn't supposed to happen. I took the BM off and detonation issues stopped...any ideas what would cause detonation just because boost was increased...yes, it was installed correctly

 

no idea...never heard of the boost machine causing detonation issues.

 

I am running a test pipe, but the O2 sensor hasn't given me any issues with it yet..

 

the testpipe wont throw a code for 100+ miles if not spaced out or tp code in the chip. not sure why you have an issue with your BM, try a laxitive. Try removing the **** and 4bar, reset the ecu and then install the BM.

 

I can't reset the ecu without going to the performance shop and having them mess with the APR 91 program I have in it now..but at least I know for some reason everything works fine until I increase the boost..it's gotta be a fuel, air, or fuel/air mixture issue..this is where the bitch is, finding out where in the hell the problem exactly is..but I think i'll take the advice and at least remove the 4 bar and **** and run the bm and see what that does..

 

resetting the ecu just takes undoing the neg part of the battery for about 10mins.

 

Check that.

Just got back from a few test runs..ran it w/o boost controller and detonation/fluttering/whatever you wanna call it kept happening..so i ran it w/o any modshack whatsoeverand put back 3bar stock fpr and airbox...no detonation issues whatsoever...so then i run it with just the 4bar (no **** or BM), and as I expected, detonation starts to happen again, everytime in 3rd or 4th gear at max boost and about 4-4.3 rpms
Now I'm gonna go run it with the 3bar back in place and the **** (BM still off)on and see what happens. but my suspicion is the 4 bar fpr is the problem. Think this is just a bad fpr?

 

what 4bar are you using? I wouldnt use a **** and 3 bar. Youre risking leaning out the car. You so should of just got a nice mbc and called it a day.

 

Might have to do that...I'm using the 4bar from modshack. In any case, it ran fine w the ****, stock 3bar and n75..so the issue logically lies with the 4bar. I might just run everything stock now...with the mods I've done so far I'm pushing 20psi w/o a boost controller. I know it seems high but I did several runs with no modshack and it consistently pushes 20psi..hmm

 

Your boy Steve takes pride in his "made in Germany" bosch fpr. He even charges like $10-15more for them also. Dont know what to tell ya