engine need to be turned?

[darthvadar tsi]

When doing a boost leak test do you half to turn the cams at tdc or can i just take the test with the oil cap off and mbc off? Just wanna make sure im doing it right before i start.

 

[luv2rallye]

http://www.dsmtuners.com/forums/art...st-how-boostpro-net-tester.html#post152554139

 

[darthvadar tsi]

It doesnt mention doing this on any boost leak tester instructional. Is this just with our cars? Can I avoid overlap with just removng the oil cap? Im pushing only 5psi through it because i put it on stock boost level.

 

[luv2rallye]

Every engine is different (especially T vs NT) but you don't want any engine sitting in any valve overlap area, if it has one, or your BLT pressure will just go through the intake valves and right out the exhaust. That area on our turbo engine is from 21*BTDC to 15* ATDC. Most of the time it won't matter which side of the overlap area you are on unless you have bad leaking valve seals or rings. And if you have those you will see other bigger problems anyway.

Keep in mind the camshafts rotate at half the crank speed. So you can just visually set the camshaft sprocket hole more than half the degree value I mentioned for the crank and you will be good (ie. crank > 15* ATDC is camshaft > 7.5* ATC as measured on the camshaft sprocket.

 

[darthvadar tsi]

ok that helps thanks! Also have you ever done a blt through the intake with the maf and filter off?.

 

[DSMTyson]

ok that helps thanks! Also have you ever done a blt through the intake with the maf and intake off?.

Yes, that is how you do it.

 

[luv2rallye]

Normally you first test the TB: http://www.dsmtuners.com/forums/attachment.php?attachmentid=122700&d=1304838292 and fix leaks. Then the turbo (with the BOV bypass hose plugged): http://www.dsmtuners.com/forums/attachment.php?attachmentid=122701&d=1304838292 and fix remaining leaks.

 

[darthvadar tsi]

thanks so much! Im testing the tb right now!

 

[PieEyedPiper]

Alternatively, I never test at the turbo inlet but rather at the IC inlet.

Which reminds me, I miss oldman.

 

[darthvadar tsi]

Alternatively, I never test at the turbo inlet but rather at the IC inlet.

Which reminds me, I miss oldman.

My blt was too big for the throttle body elbow, i guess im going to just make a smaller tester.