big turbo, low boost, HELP!

Travis89Turbo · 02-16-2011, 03:30 PM

A vacum line won't cause that much boost to leak... but it can cause a small drop.

You have a stock bpv on a t61?

Stock intercooler? Check your intercooler and pipes for holes or maybe a blown off connection!

DON'T EVER UNHOOK YOUR VACUUM LINE FROM YOUR WASTEGATE!

Are you running your boost gauge off the same port as the wastegate?

Show a pic of the engine compartment that will help us see what you are working with.

Rob1 · 02-16-2011, 04:12 PM

Yes its the stock recirculation valve,i have an hks sequential bov on the way, and i think the intercooler is stock as well and i know all the charge piping is stock.

cre · 02-16-2011, 07:52 PM

Quote:

Originally Posted by Travis89Turbo

A vacum line won't cause that much boost to leak... but it can cause a small drop.

Ever tried filling a tire with a 1/8" hole drilled in it? The pressure drop isn't the real concern, overworking the compressor is.

Rob1 · 02-16-2011, 09:27 PM

ver nice way to explain that lol that makes since. what are the odds of a crack in my intercooler? its factory, and i had an air pocket in the coolent system so it was pushing all my coolent out of the resivoiur overflow and onto the intercooler directly below. the car over heated pretty bad from lack of coolent and the next day is when i changed the oil and disconected the ecu then drove it to work. thats when i noticed the reduced power.

Everything feels the same as far as low end torque and such but when the turbo spools it begins to sprint forward but then it just levels off and feels much slower than before. I got no ideas besides aboost leak. the car is parked untill this issue is resolved any other ideas from you guys on how to find out what wrong?

cre · 02-17-2011, 02:25 AM

Search the site or Google for "DIY Boost Leak Tester". Very easy to make and VERY helpful. People who think their system is perfect are often surprised with the results and make more power after addressing the issues.

I can't remember if it's been addressed, but check for error codes, do a compression test and test oil and coolant for contamination.

EDIT: Oh, and the last thing is to check the mechanical and ignition timing. A cam on which the belt has jumped a tooth can cause similar symptoms.

02-16-2011, 03:30 PM	#1
Travis89Turbo 12psi boost Join Date: Jul 2010 Location: Utah Posts: 332	A vacum line won't cause that much boost to leak... but it can cause a small drop. You have a stock bpv on a t61? Stock intercooler? Check your intercooler and pipes for holes or maybe a blown off connection! DON'T EVER UNHOOK YOUR VACUUM LINE FROM YOUR WASTEGATE! Are you running your boost gauge off the same port as the wastegate? Show a pic of the engine compartment that will help us see what you are working with. __________________ 1995 Toyota Supra SE 71k miles. Master power T70 stock 2jzge 1989 Toyota Supra. 1jzgte swap 5 speed of course.. Driftmotion 60-1 single turbo kit. Cxracing FMIC. 2jz 550cc injectors... soon to come..... EMS Stinger. BC 264 cams 680cc injectors Spec stage 4 clutch and A LOT of boost!------SOLD 1999 Ford F350 diesel 2004 Jaguar XJR Supercharged If it hasnt broke you haven pushed it hard enough!!

02-16-2011, 04:12 PM	#2
Rob1 3" Exhaust Join Date: Aug 2009 Location: tennessee Posts: 137	Yes its the stock recirculation valve,i have an hks sequential bov on the way, and i think the intercooler is stock as well and i know all the charge piping is stock. __________________ My work in progress!!! 1989 toyota supra turbo targa top 7mgte, Five speed left hand drive.

02-16-2011, 09:27 PM	#4
Rob1 3" Exhaust Join Date: Aug 2009 Location: tennessee Posts: 137	ver nice way to explain that lol that makes since. what are the odds of a crack in my intercooler? its factory, and i had an air pocket in the coolent system so it was pushing all my coolent out of the resivoiur overflow and onto the intercooler directly below. the car over heated pretty bad from lack of coolent and the next day is when i changed the oil and disconected the ecu then drove it to work. thats when i noticed the reduced power. Everything feels the same as far as low end torque and such but when the turbo spools it begins to sprint forward but then it just levels off and feels much slower than before. I got no ideas besides aboost leak. the car is parked untill this issue is resolved any other ideas from you guys on how to find out what wrong? __________________ My work in progress!!! 1989 toyota supra turbo targa top 7mgte, Five speed left hand drive.

02-17-2011, 02:25 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Search the site or Google for "DIY Boost Leak Tester". Very easy to make and VERY helpful. People who think their system is perfect are often surprised with the results and make more power after addressing the issues. I can't remember if it's been addressed, but check for error codes, do a compression test and test oil and coolant for contamination. EDIT: Oh, and the last thing is to check the mechanical and ignition timing. A cam on which the belt has jumped a tooth can cause similar symptoms. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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