Boost Leak Test Problem

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Oct 25, 2009 | 03:10 PM

#31

Chris Moore

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From: Creston, Iowa

Quote:

Originally Posted by TTP Engineering

Compression numbers will have several factors including aforementioned effect of cams, pistons, if the head has been cut, what headgasket is being used and so on.

Our race built and OEM rebuilt engines typically are 180 across the board.

Most 9's I see are 140 across the board. Including low mileage stock cars.

Oct 25, 2009 | 06:24 PM

#32

blackdemon

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From: Bronx, NY

Quote:

Originally Posted by gsrboi80

Wired issue Leo. I'm guessing there is a line off somewhere for sure. I have neveer put my car at TDC when boost leak testing it and have always been able to put air into the system without issue.

Tripple check all lines something is off

I'll do that luke. Thank you

Oct 25, 2009 | 06:44 PM

#33

dxbtune

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From: I'm Canadian living and working in Dubai/Kuwait/Bahrain

Quote:

Originally Posted by GST Motorsports

Evo 9 is quite a bit lower, 130-150

It's not just "180" for all like somebody previously stated.

Also consistancy between cylinders is the big thing to look for.

- Bryan

man, crapped myself when i read 180.
i'm 140 139 140 139 evo IX

Last edited by dxbtune; Oct 25, 2009 at 06:47 PM.

Oct 25, 2009 | 08:20 PM

#34

EvoDan2004

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From: New Jersey

Quote:

Originally Posted by TTP Engineering

Your throttle needs to be down 100% when conducting the test.

Results should be about 180 across all 4 on a perfect engine.

Leakdown test tells more information.

aaaaa no. and the TB was 100% open.

Quote:

Originally Posted by gsrboi80

odd. me too. but his car just would not take any pressure.

Quote:

Originally Posted by GST Motorsports

Looks ok for a 9.

Evo 8 has higher comp test #'s, around 160-180

Evo 9 is quite a bit lower, 130-150

It's not just "180" for all like somebody previously stated.

Also consistancy between cylinders is the big thing to look for.

- Bryan

which is what i been saying.

Oct 25, 2009 | 08:23 PM

#35

GST Motorsports

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From: Hayward

Quote:

Originally Posted by Chris Moore

Most 9's I see are 140 across the board. Including low mileage stock cars.

Indeed, real world experience always better you know.

Anybody can post the service manual.

-Bryan

Oct 26, 2009 | 12:35 AM

#36

haseeb

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From: pakistan

shud it be the same if i have 2.3l stroker with 86 mm
thanx

Last edited by haseeb; Oct 26, 2009 at 12:46 AM.

Oct 26, 2009 | 01:11 AM

#37

Fast_Freddie

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From: Lexington Park, MD

FYI if you guys are having problems with boost leak tests with the synapse you need to take the vaccum lines off the BOV so it closes, as at idle the BOV is open...

Oct 26, 2009 | 02:08 AM

#38

ronitlancer

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how did this go from a boost leak to a compression test thread.

Oct 26, 2009 | 02:50 AM

#39

yahu

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From: Monroe - WA

^easy - it got posted on EvoM!

Oct 26, 2009 | 11:18 AM

#40

haseeb

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From: pakistan

Ny 1 willing to answer my simple question ?

Oct 26, 2009 | 04:31 PM

#41

blackdemon

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From: Bronx, NY

Quote:

Originally Posted by ronitlancer

how did this go from a boost leak to a compression test thread.

its still that. we just doing further testing. Now that the comp test came back possitive we will continue to do a leak down test. If that comes out good we will then continue with the boost leak test.

Oct 27, 2009 | 10:41 AM

#42

Evokid03

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From: Indiana

hey guys i figurd my issue with not holing pressure.

I put the car at tdc n had someone turn the crank slowly as i push air into the system..

eventually about 1/4 away from tdc it held

Oct 27, 2009 | 10:45 AM

#43

gsrboi80

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From: On a cliff

Maybe I've gotten lucky the 100+ times I shut off my car prior to doing a boost leak test. Again I have never had to put the car at TDC or turn the crank ever at all for that matter. Since 05 I've don 100+ of boost leak test on my car and my ex's RS

Oct 27, 2009 | 12:18 PM

#44

LV///R

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Quote:

Originally Posted by gsrboi80

See, that's what I don't get. I had air coming straight out my exhaust like I mentioned previously. We tried cranking the engine over a couple times and every time we boost leak tested, we had the same issue with the pressure coming out the exhaust.

And you are right, there's absolutely no way of getting lucky 100+ times in doing it, so there has to be some sort of issue with the OP's and my cars....

There's got to be an explanation for this...

Oct 27, 2009 | 04:01 PM

#45

gsrboi80

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From: On a cliff

Pretty much standard practice on my evo at every oil change. Maf cleaning and a boost leak test. I know Dan's boost leak tested his car more times then he can count. Especially with all the changes hes done to his set up over the years and as he mentioned he never had to put the car to TDC or adjust the crank

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