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I'm loosing boost :(

BoOsTeD_RB26

By BoOsTeD_RB26,
in Engines & Forced Induction

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BoOsTeD_RB26 Experienced

BoOsTeD_RB26

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Posted

As the topic states,

Last night I went down to have a little run down at the drags and noticed that the boost would consistantly drop.

Boost was set at 1.3 bar and once running any more than say 6000rpm the boost would drop back down to 1 bar....

Turbos are Group A N1's so are these running out of puff or could it be the wastegates?

I have no idea....

I tried screwing up the "gain" on my profec to try and get to hold a little longer. Didn't do shit.

Cheers,

Dan

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BoOsTeD_RB26 Experienced

BoOsTeD_RB26

Posted
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Posted

Your dead right in regards to having it occur once a certain pressure is reached. It will hold 1.1 bar nicely, but anything over that and it would just taper off.

Second to third gear change it would hit 1.3bar nicely for about 1 second, and then taper back to 1bar.

I managed 3 runs of 12.0 @ 119mph last night, very consistant. Trying so hard to get that 11 but it wasn't going to happen :)

Yeah I thought it might be a leak somewhere, will have to have a look later on tonight.

How do you diagnose a leaky BOV? Could it be that?

P.S I might need your help soon with that thermo fan mod! I'll pay ya with beer :)

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