Boost/Vac Leak TB shaft issues
I have searched the forum and seems like people with similar issues found a way to fix them but did not report back as to how. I have a low port DE with an OEM t25 kit, upon testing it for leaks I came across the shaft of the TB leaking on both sides (cable side, TPS side). I went ahead replaced it with a spare TB out of a spare low port but ended up leaking as well. While pressure testing the system comes up to 20psi +/- 2psi and will not go past that. It takes about 17seconds to lose all the pressure out of the system. I am using a 12v. Electric air pump and it seems the air leaking past the TB is greater than what the pump can supply at 20psi; so it manages to settle around that pressure. I suspect that I ruined the first TB by using compressed air from the shop at work and bumping the pressure up to about 70 psi. I don't intend to run 70 psi, but at the time of testing the higher pressure made it easier to hear and find the leaks. Yeah I Fudged up.
So I now have two options,
A. Replace the TB with a different unit until I find one that doesn't leak.
B. Find a repair kit or better yet buy a set of aftermarket seals for the existing TB.
I searched on the forum and found this TB Boost Leak?
Any one else have some experience with this issue?
I'm sure someone will chime in and tell me to do a boost leak test or search the forum....... Well I already did, several times and spent hours on both Google and on this forum. Information on boost leaks is all over the place and most are car/engine specific and it’s usually some guy who doesn't know squat trying to give advice.
I have the cap at the turbo inlet, I have tested hot side only, hot and cold capped off before the TB, and just recently I have tested with the cold side connected to the TB. I have read that turning the #1 piston to TDC is the correct way to test, but have not done that just yet.
I have typical boost leak symptoms, pig rich at idle, part throttle and tends to lean out at WOT. The IC pipes alone will hold pressure although I do think the BOV is not holding pressure past 25psi. Even with the adjustment set to full hard.
So I ended up changing the system to blow through as opposed to draw through. At initial start up the car will idle @ 14.7 afr then slowly go to 10 afr and the rich condition.
Set up is,
Low Port DE / Avenir T25 kit / 370cc inj / calum RT / ebay 2.5 IC piping kit / knock off greddy type s bov / E60 maf (currently blow through)
So I now have two options,
A. Replace the TB with a different unit until I find one that doesn't leak.
B. Find a repair kit or better yet buy a set of aftermarket seals for the existing TB.
I searched on the forum and found this TB Boost Leak?
Any one else have some experience with this issue?
I'm sure someone will chime in and tell me to do a boost leak test or search the forum....... Well I already did, several times and spent hours on both Google and on this forum. Information on boost leaks is all over the place and most are car/engine specific and it’s usually some guy who doesn't know squat trying to give advice.
I have the cap at the turbo inlet, I have tested hot side only, hot and cold capped off before the TB, and just recently I have tested with the cold side connected to the TB. I have read that turning the #1 piston to TDC is the correct way to test, but have not done that just yet.
I have typical boost leak symptoms, pig rich at idle, part throttle and tends to lean out at WOT. The IC pipes alone will hold pressure although I do think the BOV is not holding pressure past 25psi. Even with the adjustment set to full hard.
So I ended up changing the system to blow through as opposed to draw through. At initial start up the car will idle @ 14.7 afr then slowly go to 10 afr and the rich condition.
Set up is,
Low Port DE / Avenir T25 kit / 370cc inj / calum RT / ebay 2.5 IC piping kit / knock off greddy type s bov / E60 maf (currently blow through)