boost controller no workie

[georryan]

Well, i finally changed out both my fuel senders and my fuel pump (walbro 255 lph). It was a VERY simple, straight forward, direct swap. After I did all that I noticed my gas light works for the first time in the two years I've owned the car asside from the first day I drove it. YEAH!!!!! (its the little things in life).

So Hardy, my brother, and I went for a drive. We found some nicely paved back roads near Sacramento and romped on it a bit. I got 13 psi in second once, but I would get it CONSISTANTLY in 3rd. I'd floor it and see the boost go up to 10, then ramp up to 12 or 13. I didn't realize it until I hit fuel cut before redline, which I never reached in 3rd gear, so the idea fairly shocking that I should get fuel cut. I started watching my boost gauge and was shocked to see it ramp up that high just about every time I'd put a big load on the car. It came down to me seeing 13 psi and letting off the gas, so my computer never seemed to compensate for it, probably because I didn't let it keep pushign it whenever i saw it.

I think it is time to get a mbc.

On a side note, both hardy and my brother saw flashes in my exhaust when I shifted: not exactly flames out my tailpipe, but pretty dang close.

Oh, and a stock legacy turbo with 4.111 gearing is burly quick.

-Ryan

[vrg3]

Wait, so you're supposed to be using stock boost control, but it's not working right?

But it reached a steady 13 psi?

Weird...

Can you check your vacuum hoses and make sure they're all in good shape (and still there)?

http://www.graphics.cornell.edu/~v/vacuum/

Maybe you should clean out the solenoid, too.

[georryan]

I've cleaned the solenoid twice. It has steadily gotten worse. The boost I'm reading is from the manifold.

Also, I don't know if it was a steady 13, because when I hit fuel cut I wasn't looking, and when I was watching and see it go over 10 and then ramp up to higher levels I'd let off the gas before it would get vary far. I really didn't feel like pushing it at that point.

It was weird. My initial WOT on 3rd once I shifted would steadily rise from 5 to 10 and stay for a sec. After being there and the load increased as the rpms gained the gauge would then suddenly ramp up.

I guess it could be a vacuum leak. I should start looking around.

[-K-]

A lean condition will cause boost to go up. The exhaust is hotter so it can overrun the wastegate.

[dzx]

I'd get an electronic boost controller over a manual boost controller if you have the money. The hallman i have isnt very consistant,I'll probably be looking to replace it soon. it will hit 11psi in first and second and boost just keeps building in fifth until the fuel cut which i need to remove except the car is scary fast already and i dont like to step on it that often. Tends to blow pipes off my fmic too.

[irishsetter]

your fmic pipes might be blowing off due to the type of clamp you use. If you use a regular hose clamp they tend to heat up and break loose. I probably would use a solid strap type clamp.