Over Boost.... Need Help
Over Boost.... Need Help ok here is the deal. had my car at qmp last week and runnin great 531rwhp on pump gas, and a stock motor. any ways got it home and changed all the vac lines b/c one ripped in to and now i cant get the boost to hold at 9psi. it just keeps climbing. i have tried everything i can think of, here it goes:
no boost controller w/ waste gate nipple not hooked up
no boost controller w/ wastegate hooked to turbo, slowed spool down some
boost controller hooked up between gate and turbo
i think thats about it. all vac lines are good and hooked up, vac. is about 20-22. car isnt running as good as it did when i left robs and it dies when you let off of it after a WOT run. which i think is due to the turbo/boost not working correctly. could the waste gate be bad? its like its not working and just keeps letting the turbo spool. i admit i dont know a whole lot about turbo set ups. could a leaky gasket cause a problem? any suggestions would be great.
no boost controller w/ waste gate nipple not hooked up
no boost controller w/ wastegate hooked to turbo, slowed spool down some
boost controller hooked up between gate and turbo
i think thats about it. all vac lines are good and hooked up, vac. is about 20-22. car isnt running as good as it did when i left robs and it dies when you let off of it after a WOT run. which i think is due to the turbo/boost not working correctly. could the waste gate be bad? its like its not working and just keeps letting the turbo spool. i admit i dont know a whole lot about turbo set ups. could a leaky gasket cause a problem? any suggestions would be great.
FormerVendor
Joined: Dec 2001
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From: WWW.SPEEDINC.COM
Well, if yourun a vacuum line directly from the engine to the bottom port on the wastegate (open side) and leave the top of the gate open to atmosphere, it will just be running spring pressure. (and yes it will spool slower)
If you have hooked the gate up like that and it still overboosts, than I would guess that the wastegate is sticking, or the diaphram is leaking.
If you have hooked the gate up like that and it still overboosts, than I would guess that the wastegate is sticking, or the diaphram is leaking.
so run a vac line from the motor to the part of the waste gate that is for "venting" and see what happens? in return this would leave the one on the side of the waste gate open to the atmosphere, correct. how do i determine if the diaphram is leaking. this is a standard hks waste gate i assume
FormerVendor
Joined: Dec 2001
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From: WWW.SPEEDINC.COM
Yes, run a hose from the intake to the bottom port of the wastegate. (not the top port by the spring adjusting screw).
You should then only have as much boost as the spring in the gate allows.
You should then only have as much boost as the spring in the gate allows.
so i dont have to worry about the nipple on the side of the waste gate just let it vent and run vac line from the manifold to the under side. now if that fixes it, then what. and where is this adjusting screw not sure i have seen it. like i said i am a moron when it comes to this stuff.
FormerVendor
Joined: Dec 2001
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From: WWW.SPEEDINC.COM
Yes, a hose from the intake to the bottom port on the gate. The top port on the top of the gate leave open to atmosphere.
Give that a try first. If it fixes your overboost problem, than you will have to go over your boost controller install.
Give that a try first. If it fixes your overboost problem, than you will have to go over your boost controller install.
new question, i have a tial bov and i have been talking with some people on here about it. it doesnt make the woosh sound like it should.. i hear a flutter but i have been told this flutter i am hearing is the waste gate and not the bov, what do you think
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FormerVendor
Joined: Dec 2001
Posts: 2,444
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From: WWW.SPEEDINC.COM
Originally Posted by KAOS
new question, i have a tial bov and i have been talking with some people on here about it. it doesnt make the woosh sound like it should.. i hear a flutter but i have been told this flutter i am hearing is the waste gate and not the bov, what do you think
Unless your gate is vented to atmosphere, you will never hear it.
Fluttering noise could be compressor surge (possibly the BOV is not opening).
Make sure the vacuum hose to the BOV is not leaking anywhere, is a decent size (5/16 id or so), and is going to a direct vacuum source.
If the hose leaks, or is very small, and not directly from the intake, the BOV may not function. (the vacuum source should not be tee'd of another small vacuum line)
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Verdad Gallardo FormerVendor
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From: WWW.SPEEDINC.COM
Originally Posted by KAOS
so the bov has to have a vacuum going to it? and it cant be teed of of another line? would the one for the break booster work. any suggestions as to where a closerone would be at?
(What you want to avoid is having multiple components tee'd off of a single small diameter hose)
man im an fn moron. so that flutter is the surge from the turbo. b/c up to this point i have not had a vac line to the bov. now once the surge is fixed could this fix my boost problem?
FormerVendor
Joined: Dec 2001
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From: WWW.SPEEDINC.COM
Originally Posted by KAOS
man im an fn moron. so that flutter is the surge from the turbo. b/c up to this point i have not had a vac line to the bov. now once the surge is fixed could this fix my boost problem?
That will have no effect on your WOT boost, other than it should recover faster on shifts.
ok hooked up a vac line to the bottom of the waste gate and it is still doing it. now what. going to hook a vac line to the bov and see if i still hear that stutter. stutter is still there even after vac line hooked to the bov. i didnt tap into the break booster for the vac line just tried to find one to see if it would do any thing.
Last edited by KAOS; Aug 9, 2004 at 09:19 AM.
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From: its as intense as the time i forgot how to sit down
on a qmp kit the wastegate is upside down the "bottom"nipple is accually the top one i belive and the side one is considered the bottom one,it should be hooked of the intake or the turbo housing to the side nipple and leave the bottom one open,and if you deleted all your emissions there is a perfect place on the back of the intake for the bov
hmm...i am having the same problem with my TTi kit.
turbonetics race gate...9psi spring (unverified) but have gotten up to 15.xpsi already.
i disconnected the E-boost controller and same thing happens.
got race gas and 60# injectors....wideband reads rich
over compensated just in case. better to error on the side of safety.
i am goin to do the following
1. replace the WG spring with the smallest 5psi if that doesnt work
2. order the Innovative Indy-Gate (51mm)
KAOS -
I doubt a leaky gasket would cause overboost...maybe underboost.
if you find out something please post back here...and i will let u know also.
turbonetics race gate...9psi spring (unverified) but have gotten up to 15.xpsi already.
i disconnected the E-boost controller and same thing happens.
got race gas and 60# injectors....wideband reads rich
over compensated just in case. better to error on the side of safety.i am goin to do the following
1. replace the WG spring with the smallest 5psi if that doesnt work
2. order the Innovative Indy-Gate (51mm)
KAOS -
I doubt a leaky gasket would cause overboost...maybe underboost.
if you find out something please post back here...and i will let u know also.
still no luck have tried every configuration that i know of with the controller, waste gate and turbo. took waste gate apart, at least as far as you can while still on the car and every thing seems to be loose and nothing seems to be stuck. now what do i do, any suggestions would be great is there any other gate i can use on this kit