So i'm missing my target boost of 29 by about 4 or so. My AFRs seem about right and I was thinking it could be a small Exhaust side leak, what bolts should i check out to rule that out or I guess it could be a gasket as well that tightening a bolt wouldn't cure?

 

have u done a boost leak test?
are you tuned for the 29 psi?
boost leak first, then check the exhaust side stuff.

 

What are you basing the numbers from? What are you tuned on?

 

Yes, I am tuned for 29 on E85. I'm running a v3 rom with the zeitronix flex fuel kit. The numbers are based from my AEM Wideband and boost gauge. I haven't done a boost leak test yet, that is on the agenda for this week but based on my previous experience with boost leaks that seems to correspond with a rich AFR and my AFRs are not rich at all.

 

The boost gauge will read somewhat different than what you're actually tuned for usually. Is this a new issue all of a sudden?

 

yes, it was running 29 psi according to evo scan and my boost gauge and now it is running 25 or so. The drop in power is very noticeable, it started over the past weekend. Ambient temps were the same and running twin external wastegates the setup has been very reliable and precise re hitting target boost in different temps.

 

so the issue was figured out, the crush washer on my external wastegates somehow got deformed, maybe from the heat? and that was keeping the turbo from hitting the target boost. Anyone else heard of this happening?

 

assuming ur talking about the washers that go on either side of the air nip, sure, anything that is suppose to hold air and leaks will cause this problem.

crush washers are only suppose to be a one time use thing.

 

yep, talking about those and yes I wasn't reusing them, i only removed it when i noticed i was missing target boost and then put back in new ones.