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post #1 of 13 (permalink) Old 03-31-2010, 12:25 AM Thread Starter
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Boost Predicament

Iím kind of stumped here. Canít seem to make boost past 20-22 psi with a new drop-in turbo. On the street, boost builds to roughly 2,600 rpm, then falls completely off. Weíre talking 22 psi to 10 instantly, but at wide-open throttle.

Things Iíve done:
-Checked all intercooler plumbing, clamps, boots, replaced compressor outlet O-ring, pressure tested the turbo system to 45 psi and no leaks whatsoever.
-Replaced OE turbo intake boot (the one that cracks and rots out)
-Checked shaft for side-to-side play = looks good
-Checked shaft for in-and-out play = looks good too
-Checked compressor wheel to see if it was hitting the housing = looks fine
-disconnected the EBV (unplugged)
-There are no exhaust leaks anywhere either
-fuel and oil look perfect (ICP maintains at 2,900+ psi)
-Tried a new MAP sensor too (a code had been stored) = no change


Is something physically stopping the turbo from mechanically making more boost? I hear nothing. Why is it dropping off so suddenly at WOT? Should I take a look at the turbine side? Keep in mind that the turbo is brand new. It has the 1.15 non-wastegated housing.

I know that the EBV is supposed to default to the open position when the harness is unplugged (correct?), but could it somehow be flapping back closed on pro-longed boost runs? I dunno. Iím having a shop take a look at the turbine side right now, but am lost on what this could be.

Any suggestions are much appreciated.

PS - Stage 1 injectors, Adrenaline, TW tuning

'97 F-350
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post #2 of 13 (permalink) Old 03-31-2010, 12:48 AM
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Re: Boost Predicament

Do you have a boost fooler hooked up? Just wondering.

And EBPV was my first guess. You might try physically wiring it open. That, or delete it.

Good luck Mike. It's something simple for sure.
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post #3 of 13 (permalink) Old 03-31-2010, 01:03 AM
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Re: Boost Predicament

Are your egts continuing to climb when the boost drops off?
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post #4 of 13 (permalink) Old 03-31-2010, 01:04 AM
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Re: Boost Predicament

Maybe dropping off fuel pressure. That would deff cause lower boost.

2000 F-250 Regular Cab
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2000 F-350 ECLB DRW
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post #5 of 13 (permalink) Old 03-31-2010, 01:19 AM Thread Starter
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Re: Boost Predicament

Quote:
Originally Posted by theSLEEPER View Post
Do you have a boost fooler hooked up? Just wondering.

And EBPV was my first guess. You might try physically wiring it open. That, or delete it.

Good luck Mike. It's something simple for sure.
I never had a boost issue before, the other stock turbo would push 32 psi all day long. I may end up wiring the EBV open just for peace of mind though.

Also, driving through town under normal acceleration the truck does fine. Spools up and takes off just fine.

Quote:
Originally Posted by mattr66 View Post
Are your egts continuing to climb when the boost drops off?
EGTs do not continue climbing when the boost drops off. They seem to peak and stay put.

Quote:
Originally Posted by Powersmoker View Post
Maybe dropping off fuel pressure. That would deff cause lower boost.
I did not check fuel pressure. That may be worth doing when I get the turbo back. Would that also possibly be why EGTs stop climbing under WOT?

Thanks for the replies. I really appreciate it. Keep them coming......

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post #6 of 13 (permalink) Old 03-31-2010, 01:44 AM
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Re: Boost Predicament

Yeah, with out having the fuel there it isn't going to make the egts higher

More fuel = More Heat

2000 F-250 Regular Cab
1069 RWHP 1768 Torque
10.55 @ 129 MPH NOS

2000 F-350 ECLB DRW
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post #7 of 13 (permalink) Old 03-31-2010, 02:17 AM
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Re: Boost Predicament

I thought fuel pressure would cause it to plane out?

But thinking about it, I guess you're right, it has boost under load, but once the fuel is gone, it drops and planes...
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post #8 of 13 (permalink) Old 03-31-2010, 04:21 PM
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Re: Boost Predicament

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Originally Posted by theSLEEPER View Post
I thought fuel pressure would cause it to plane out?

But thinking about it, I guess you're right, it has boost under load, but once the fuel is gone, it drops and planes...
That's where I was leading with my question..... if boost is dropping off and temps aren't contuning to climb, then there is a fueling problem.
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post #9 of 13 (permalink) Old 03-31-2010, 05:09 PM
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Re: Boost Predicament

Gotcha. Makes perfect sense. So, he needs to be looking at an electric fuel setup??
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post #10 of 13 (permalink) Old 04-01-2010, 03:06 PM
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Re: Boost Predicament

or at least check the pressure see if its dropping off.

Blue 2012 XLT SCLB 4X4 , 38,550 miles, 3:55's & 18's Camper and Tow packages. Edge insight, Airlift Wireless compressor & Air Bag set-up, Dieslesite filter.
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