I swear I remember somebody saying that there is a fix for it. Im having a boost leak problem, so I hooked up the leak tester and found I have a good bit of air escaping out of the throttle cable side of the throttle body shaft. I did some searching using "throttle body mod" and came up with 3 post that didnt have anything to do with it.
#96109, "RE: Boost leak in throttle body shaft" In response to Reply # 2
probably normal Deej. I wouldnt worry to much about it. You could disassemble the TB and remove the shaft. Apply a heavy whee bearign grease to the shaft and re-install it. The grease will make it difficult for air to pass by and act as a restrictor. Wont last forever but if you do it once a year it may help.
#96110, "RE: Boost leak in throttle body shaft" In response to Reply # 3
Im def gonna give it a shot. I hope this might be the problem we've been talkin about. I did some searching on fuel pressure dropping under boost and other members did have probs like mine but never posted a remedy.
#96112, "RE: Boost leak in throttle body shaft" In response to Reply # 4
Originally posted by DJ420a Im def gonna give it a shot. I hope this might be the problem we've been talkin about. I did some searching on fuel pressure dropping under boost and other members did have probs like mine but never posted a remedy. Thanks Terry
Just an FYI, but I have not had this problem with my Modern Performance 60mm Throttle body. The last time I did a boost leak test it held without leaks.
What throttle body are you testing this with? stock? Tomorrow I will take a closer look at my MP TB and see what they did with the shaft. Might help. who knows.
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#96114, "RE: Boost leak in throttle body shaft" In response to Reply # 6
They all do that. Not much that can be done.
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#96119, "RE: Boost leak in throttle body shaft" In response to Reply # 8
Yeah i've noticed too that the MP TB doesnt really leak either..I noticed steadier boost when running 18 psi with it. On a side note, I can tell the MP TB works and is flowing better than stock, because I had to richen up my Megasquirt VE fuel table by approx 2-3%. That mod, along with some good weight reduction in the hatch(stereo crap), took 4 tenths off of my 1/4 time
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#96156, "RE: Boost leak in throttle body shaft" In response to Reply # 9
Originally posted by XtremeRS Yeah i've noticed too that the MP TB doesnt really leak either..I noticed steadier boost when running 18 psi with it. On a side note, I can tell the MP TB works and is flowing better than stock, because I had to richen up my Megasquirt VE fuel table by approx 2-3%. That mod, along with some good weight reduction in the hatch(stereo crap), took 4 tenths off of my 1/4 time
Excellent info ^. that would have quickly ended a lot of the 60mm help vs. hurt discussions in past threads
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#96918, "RE: Boost leak in throttle body shaft" In response to Reply # 12
I know this thread is a bit older, but I have a question. When you did your test....how much PSI did you get it up too? Mine won't hold more then 5psi before the air starts whinning out of the TB. Makes a sound like if you were to blow up a ballon and pinch the tip and slowly stretch it so it makes that high pitched squeel. Other then that I think my setup will hold boost.
I just know with my little S16G turbo it should be spoolin up a lot faster then what it does. I also have a huge exhaust leak I need to tend too!
Sounds like I just need to get a HRC 3" eliminator and MP 60mm TB.
#96919, "RE: Boost leak in throttle body shaft" In response to Reply # 13
You should be able to hold more than 5 psi without any sounds. If it leaks at 5 psi then you are not getting that leaking air when you boost past 5 psi.
Fix your leak and test again. Should be able to hold 20 psi or blow your tester off.
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