Boost Spike And Fuel Cut!

[r32matt]

Hey,

Yesterday when I was driving I noticed that my boost started getting lower. Im running on 12psi and it dropped to 11psi. Later that day it dropped down to 10psi. I checked my boost controller and the bolt was very tight "Im using a Turbotech boost controller". So i unscrewed it anyway and turned it up a little bit. I took it for a drive and still was only boosting to 10-11psi. I turned it alot more this time to see a difference but as soon as i hit 12psi on boost my car cut out..... felt like a fuel cut.

So after that i unscrewed the boost controller alot so i would be running on standard 10psi. When i drove it today it was spiking from 10 to 11psi, sometimes 12psi...... My boost controller never used to spike at all...... The only thing ive done recently is install a GTR fuel pump. Could there be something wrong with my boost controller? Could a split hose casue this to happen? or is it the fuel pump?

Thanks

[The Mafia]

Well, if you have a R33 they have a Flow\overboost map with anything 12psi or beyond.

This gets covered about 10 times a day.

As for the boost loss - could be a small pipe split, or just because its starting to get hot.

If your running a stock intercooler, then anything above 10psi is a big no.

[r32matt]

I have a R32 with a RB20DET. I have a FMIC and never have had problems in the past. Hopefully its just a split hose..... But im not sure....

[TTT]

you sure the hose to the boost gauge isn't the problem, rather than the boost controller.

you could be running alot more boost than you think because the gauge is not reading right.

[r32matt]

I hope Not!! That would really suck! lol

I checked the hoses to the boost guage and it seemed fine.... Im gonna remove all hoses 2nite and clean out the boost controller. Hopefully I can find out the problem then..... So annoying though!!!

[tuf514]

OK im new to turbo cars so please bare with me.

Today after taking my R33 for a strap, my boost spiked to around 14/15 psi. Its set at 12 psi.

I heard backfiring which i assume was the fuel cut and quickly backed off.

Im using a turbosmart turbo timer but i havent adjusted it.

Its been fine hitting 12 psi since i bought it. Id say it was about 25 degrees outside.

Im running a FMIC, bigger turbo, screamer, ECU edit.

What do you lot think?