No Boost!
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No Boost!
Okay,i've got an 88'Turbo.Recently the car will only boost up to 5lbs,the wastegate works and i'ved removed the turbo[stock] no issues.But here's the hting that puzzles me,if i disconnect the line that leads to the wastegate,it boosts like an reaped ape.ANYONE got suggestions?
THANKS.
THANKS.
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no boost
the boost controller was added after the fact[turbo XS] trying to raise the boost level to aleast 9PSI.controller is a screw-type for boost adjustment.
The issue is-------------the turbo screams[spool] but the results are the same,low boost pressure.My car is a 10th with a big street-port,walbro fuel-pump,550cc primary and 750cc secondaries.Full Racing Beat exhaust.I have no vaccum leaks,it's not pulling like it should,like before.
Thanks.
The issue is-------------the turbo screams[spool] but the results are the same,low boost pressure.My car is a 10th with a big street-port,walbro fuel-pump,550cc primary and 750cc secondaries.Full Racing Beat exhaust.I have no vaccum leaks,it's not pulling like it should,like before.
Thanks.
Last edited by TRINITUNER; 06-18-08 at 09:13 PM. Reason: needed more info
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Yes i can hear air rushing under boost,but CAN"T find it.I'ved checked every pipe connector,vaccum hoses,TBI,cold side of turbo and intercooler[top-mount].The only thing that i did notice was rubbing of the inter-cooler on the top of the alternator.My BOV is not opening prematurely[early]there are plenty of washers to keep it closed[turbo XS RFL BOV].The only mod to the turbo[s5]was a To4 upgrade to the cold side,before this happen this car was a ROCKET!I tried it with vaccum dissconnected from wastegate,HELLO-------can't keep the rear-end straight.
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Seems like your wastegate is opening prematurely and dumping out all your boost? This seems to happen often enough with turbo FCs. Usually, you just need a new clamp or something to make sure the wastegate isn't slightly loose and leaking out air. But it's definitely something to look into.
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Yes i can hear air rushing under boost,but CAN"T find it.I'ved checked every pipe connector,vaccum hoses,TBI,cold side of turbo and intercooler[top-mount].The only thing that i did notice was rubbing of the inter-cooler on the top of the alternator.My BOV is not opening prematurely[early]there are plenty of washers to keep it closed[turbo XS RFL BOV].The only mod to the turbo[s5]was a To4 upgrade to the cold side,before this happen this car was a ROCKET!I tried it with vaccum dissconnected from wastegate,HELLO-------can't keep the rear-end straight.
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I'll add a few more washers to the BOV and see if that solves the problem.At idle this BOV doesn't leak,it is possible that under boost it might be leaking.
Thanks for the help[all you guys].
Thanks for the help[all you guys].
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Of course it doesn't leak at idle! Why should it, there isn't positive pressure to push air out.
That's like saying that your plumbing doesn't leak when the water to the house is turned off.
--Alex
That's like saying that your plumbing doesn't leak when the water to the house is turned off.
--Alex
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no boost
Thanks alex,i'm under alot of stress right now,not thinking straight.but i will add those washers and see if there is improvement.let you guys know if it fixes the problem.
It's FRIDAY![track-night] NO UP AND DOWN,just ROUND AND ROUND.
It's FRIDAY![track-night] NO UP AND DOWN,just ROUND AND ROUND.
Last edited by TRINITUNER; 06-20-08 at 12:16 AM. Reason: needed to add info.
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I'm not quite sure what you mean by no pressure to push it out. At idle w/o the throttle pushed the intake after the throttle body builds a vacume of 15-20psi before the throttle body the turbo isn't working but it is not drawing a vacume either (i had my boost gauge hooked up wrong to find this out lol) The pull of the vacume plus the pressure from the turbo side will easily push open a poorly adjust valve. The positive pressure built up by the turbo under boost is not all that opens the valve it is the huge instant vacume created by letting off the throttle. Just think about it if you have a lose spring and 15lbs of vacume pulling on it then whats to stop it from opening a little.
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added washers,it helped out.Was able to get 9lbs of boost with controller still connected,but it would jump from 7psi to 9psi vice-versa with hesitation.Was only able to put-down 8.80 on the 1/8 mile.My next step is to remove all components and inspect everything again.Tps is find and so to compreession.
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