Yes another thread...sorry guys last one i promise (Boost intercooler realted)
03-28-2010, 09:51 AM
#21
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I'm not really freaking out I just roughy it was weird, I'm gonna check if I have a boost leak first, if not I'll turn the **** and smile. As for the turbo I know it will hit 14psi, this dude in here is at 18psi with the stock 15g wheel I have the upgraded 19t
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03-28-2010, 10:06 PM
#28
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O.K.
Is his boost controller operated on a boost signal from after or before the intercooler.
As in is it internal wastegate off the housing??? If so this is pretty much a no brainer.
However the O.P. has said his boost signal for the boost controler wastegate etc is after the intercooler. Therefore if there was a huge leak after the intercooler etc, his waste gate would never open. Or if his intercooler was clogged etc not letting any air through. THe compressor housing would be up to 50 psi but after the intercooler it could be 2psi and the wastegate would never open.
I think its a loose clamp blowing off under boost. Either that or the turbo isn't big enough to support the higher flows with the improved cooling. As in he is maxing out on airflow not boost.
Is his boost controller operated on a boost signal from after or before the intercooler.
As in is it internal wastegate off the housing??? If so this is pretty much a no brainer.
However the O.P. has said his boost signal for the boost controler wastegate etc is after the intercooler. Therefore if there was a huge leak after the intercooler etc, his waste gate would never open. Or if his intercooler was clogged etc not letting any air through. THe compressor housing would be up to 50 psi but after the intercooler it could be 2psi and the wastegate would never open.
I think its a loose clamp blowing off under boost. Either that or the turbo isn't big enough to support the higher flows with the improved cooling. As in he is maxing out on airflow not boost.
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03-28-2010, 10:43 PM
#31
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As a general rule its good to do a pressure test everytime you really mess with those pipes. Leaks are amazing sometimes. You can have everything right and find a decent leak on a coupler you were sure of.
Its not likely causing a 2 psig diff, but it's just a good idea.
Its not likely causing a 2 psig diff, but it's just a good idea.
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03-29-2010, 12:24 AM
#32
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The real check of the IC loss is a guage on both inlet and outlet. 2 to 1 it is a more restrictive core.
Do not sell pressure loss through the IC too short. Typically, the IC loss is recovered by turning up the boost. Easy enough, but with it up goes the exhaust gas pressure as the turbo has to do more work to push past the added restriction.
If the exhaust gas pressure goes up, reversion into the chamber goes up during valve overlap and the intake charge gets hotter. Hotter is closer to knock. Not too cool.
Essentially, an increase in IC restriction and raising the boost to compensate is the same as chasing your tail.
Corky
have spent considerable time chasing my own tail.
Do not sell pressure loss through the IC too short. Typically, the IC loss is recovered by turning up the boost. Easy enough, but with it up goes the exhaust gas pressure as the turbo has to do more work to push past the added restriction.
If the exhaust gas pressure goes up, reversion into the chamber goes up during valve overlap and the intake charge gets hotter. Hotter is closer to knock. Not too cool.
Essentially, an increase in IC restriction and raising the boost to compensate is the same as chasing your tail.
Corky
have spent considerable time chasing my own tail.
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03-29-2010, 08:08 AM
#33
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^^^ and that's exactly why I didn't wanna turn my boost up... I'll do a pressure test and see where I'll go fron there, BTW anyone still has the link to that cheap DIY pressure test.
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03-29-2010, 08:19 AM
#34
And it contains the link on how to make one - How To: Boost leak tester for $5.02 - evolutionm.net
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03-29-2010, 08:46 AM
#35
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I saw a pretty nasty pressure drop with my 18x12x3" CXracing core; when I went to the little 18x6.5x2.5" tube and fin core I gained a good 300rpm of spool time, however, it doesn't cool as well.
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03-29-2010, 03:29 PM
#37
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If your wastegate & boost gauge lines are tied in post IC & pre TB, then the mechanical system should automatically compensate for any pressure drop between the turbo outlet and the TB. Possibilities could include a boost leak post vac lines, or a faulty gauge, possibly even a faulty MBC, or like the others said, you might've accidentally adjusted the MBC while working on the car.
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03-29-2010, 03:55 PM
#38
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Damn I read wrong, I thought the MBC was pre-IC but boost post...The boost should stay the same if there was additional pressure drop you'd just notice slower turbo response if anything.
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