Runaway boost from no1 turbo.

[carl0s]

11psi from no1 is surely out of its efficiency range

 

When I put my foot down, I start to see 8psi at about 3,000rpm, and easily see 10.4psi by 3500. Yesterday I noticed nearly 12psi at about 3500rpm. I don't feel the surge of no2 come online for at least a few more hundred rpms, say 3900.

 

So, unless this is coming from both turbos, and the fact that I don't feel the no2 surge doesn't mean it's not boosting.. well unless that's the case, then surely my no1 is going a bit too far.

 

Is this normal? I run a bleeder valve from the VSV to the wastegate actuator. I see 17.1psi max normally.

[Lucifer]

We usually run 0.8 Bar on ours at BPU., but dont forget ithis is at 2-3500 RPM so its doesnt flow much air compared to 7000 rpm.

 

Also dont forget no2 could be opening by 3500rpm very slightly.

[Suprasteve]

what gear are you in when you get those results?

 

In sixth gear between 2K & 4K rpm i see around 0.8 bar = about 12 psi.

 

BTW I'm BPU.

 

I used to have a bleed value, they are very hit and miss so i got an electronic boost controller.

[carl0s]

I'm auto, second gear, foot hard down but not hard enough to kick-down to first.

 

It's interesting to know that you guys run similar.

It just surprised me because 0.8 bar (can't we all just stick to psi? ) is pretty much stock full boost for both turbos.