Temperature+boostsettings

[Ho0ked]

So it went from 90+degrees here to 80+ degrees here recenty.
When it was hot boost was set at 23-25ish

lately all the sudden 3rd gear climbs towards 30!?
All gears are hitting 25-26 now

I've tried turning my mbc down, In total ive supposedly turned it down like 8 psi ?
-4 turns on the top screw (fine adjustment) and -1 turn on the side (large adjustment)

She still hits 26-27psi in 3rd /sigh

Also from like 0 to 14 psi the car pulls hard, then at 14-22psi the acceleration gets weak then at 23+ it starts to pull strong again

This started the same time as the high ass boost level. wtf


So does temperature realy have this kinda effect on boost levels?


If im barking up the wrong tree, what might be causing these things?



Please help, thanks

 

[oldman]

so I see you have the Turbo XS unit......and probably tapped from the BOV line.

1. Tap the pressure source from the compressor housing and see if it helps. If not go to 2.

2. Disable the mbc by connecting the presssure source directly to the actuator. If you're able to run the actuator pressure of 10-12 psi, you have a defective mbc. If problem persists, you probably have boost creep.

 

[Ho0ked]

I know I need to tap my compressor housing but it seems like alot of work

The boost refference doesn't seem like it would effect these things.
The high psi is like spike, not creep, it goes right up there off the bat, not slowly.

.......And now that the mbc is turned down its harder to reach 20psi in 1st

I have boost issues............................

 

[autronicDSM]

If tapping compressor is too much work you can tap your intercooler pipe right after compressor outlet. That's what I did. I got 1/8" NPT to -3AN fitting, cut the threads off on -3 side and welded it to tubing.

 

[autronicDSM]

ATP turbo also sells a fitting that goes through your silicone coupler. I'm not sure though how leak-proof it is.

 

[oldman]

The high psi is like spike, not creep, it goes right up there off the bat, not slowly.

That's not spike neither, you have all out boost which means the mbc is either defective, boost leaks in and around the mbc (vacuum line) or it was not hooked up correctly. Just test run bypassing the mbc and you'll find out for sure. Hopefully your next post will be about the result of the test run.