where to weld fitting to pressure check exhaust?

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Mar 8, 2009 | 06:24 PM

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TECH Junkie

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From: pensacola fl

where to weld fitting to pressure check exhaust?

collector
one side of the y pipe
backside of the y pipe
before the muffler?

Mar 8, 2009 | 08:22 PM

SweetS10V8

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Ive never done it, but I have always understood it to be one in front of and one behind the muffler since it is your restriction.

Mar 9, 2009 | 07:54 PM

DaddySS

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From: Bergen County, NJ

do you mean to check backpressure?

Mar 9, 2009 | 09:30 PM

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TECH Junkie

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From: pensacola fl

Quote:

Originally Posted by DaddySS

do you mean to check backpressure?

yes.
thank you.

Mar 9, 2009 | 09:41 PM

NHRAMAN

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From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*

Quote:

Originally Posted by TJ

yes.
thank you.

WHY

Mar 9, 2009 | 10:18 PM

jsteele90

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From: delaware

why would you want to do this?

Mar 10, 2009 | 02:10 AM

SweetS10V8

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From: Michigan

To see how much of a flow restriction your muffler is causing.

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Mar 11, 2009 | 02:42 AM

DaddySS

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From: Bergen County, NJ

The back side of the y would give you the best reading, but if you want to take the readings again after you would want to take it from the collectors.

BTW, there are tools that mount in the AIR pump or O2 fittings, which might be the easiest approach.

Last edited by DaddySS; Mar 11, 2009 at 03:34 AM.

Mar 11, 2009 | 05:35 PM

#10

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From: pensacola fl

Quote:

Originally Posted by DaddySS

well how bout that.
glad i posted this thread. im going to search now, but do you have a link to such adapter?
i can pop it right in my 02 bung.

Mar 11, 2009 | 06:49 PM

#11

DaddySS

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From: Bergen County, NJ

http://www.thefind.com/cars/info-exh...ressure-sensor

Mar 11, 2009 | 06:50 PM

#12

Red99TA

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From: Topeka, KS

I've never heard of this. How can it work since there's still a flowpath through the motor past the rings or past the exhaust valves that are open and out the throttlebody. I mean the TB will be shut but there's still flow through the hole in it. I would think you need the flowpath up the exhaust towards the motor sealed to make it more accurate.

edit - nevermind, this is probably done with the motor running right?

Mar 11, 2009 | 06:55 PM

#13

DaddySS

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From: Bergen County, NJ

You basically want to run the engine at wot up to your target RPM. I believe the target is 7PSI or less and for every 1 PSI above that figure about 5hp loss.