measuring back pressure @ the exhaust manifold
Joined: Mar 2002
Posts: 1,619
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From: The Elysian Fields (Texas)
Carlos & howard thanks for the pics and info! Just what I was after.
For Carlos - a couple questions regarding your location(s)
For me, I'm running a similar manifold setup. Am I going to get different readings at certain locations in the manifold? I was thinking of tapping my tubing into waste gate runners (where they are collected) but would this location give me useful/useless readings vs. putting them closer to the engine? (like yours, in the primaries)
For Carlos - a couple questions regarding your location(s)
For me, I'm running a similar manifold setup. Am I going to get different readings at certain locations in the manifold? I was thinking of tapping my tubing into waste gate runners (where they are collected) but would this location give me useful/useless readings vs. putting them closer to the engine? (like yours, in the primaries)
I orginally read up on the topic here: http://efi101.com/forum/viewtopic.ph...=asc&highlight=
Junior Member
Joined: Mar 2008
Posts: 22
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From: Idaho
Carlos
I need to thank you for all your valuable help with your speed secrets.
Your $$$ sponsorship took us by surprise.Very generous and much appreciated.
Enjoy the video. We owe you a great deal. Keep up the secrets
http://www.youtube.com/watch?v=xwX9xf4Wjok
Mark Twain, one of many who has suggested that a life without risks is not a life worth living. ...
Mark Twain suggested by Robert C. Knies, Jr., RN, MSN, ... Many highly intelligent people are poor thinkers. Many people of average intelligence are skilled thinkers. ..... To win without risk is to triumph without glory. Pierre Corneille ...... To have a death worth dying, one must first have a life worth living. ...
PS I believe this.
TAPPED RACING
The Grey Ghost
Cell (925) 550-9910
www.tappedracing.com
I need to thank you for all your valuable help with your speed secrets.
Your $$$ sponsorship took us by surprise.Very generous and much appreciated.
Enjoy the video. We owe you a great deal. Keep up the secrets
http://www.youtube.com/watch?v=xwX9xf4Wjok
Mark Twain, one of many who has suggested that a life without risks is not a life worth living. ...
Mark Twain suggested by Robert C. Knies, Jr., RN, MSN, ... Many highly intelligent people are poor thinkers. Many people of average intelligence are skilled thinkers. ..... To win without risk is to triumph without glory. Pierre Corneille ...... To have a death worth dying, one must first have a life worth living. ...
PS I believe this.
TAPPED RACING
The Grey Ghost
Cell (925) 550-9910
www.tappedracing.com
Anybody consider the cooling effects the long copper/stainless tubing has on the accuracy of the back pressure measurement?
It would seem the pressure "felt" across the turbine inducer/exducer will be different than what you might measure from a remote mounted pressure sensor referenced from cabin atmospheric pressure.
It would seem the pressure "felt" across the turbine inducer/exducer will be different than what you might measure from a remote mounted pressure sensor referenced from cabin atmospheric pressure.
No doubt theres a minor discrepency, how much is hard to say. But for the cost vs. benefit of a true EMP sensor (the sending unit itself being in the $1500+++ range) to eliminate a possible one or two PSI diffference, I'll live with the tubing 
Actually, I've thought about this a little more after I posted, and I no longer think the cooling effect or length of hose would have anything to do with the measured accuracy of pressure. I'd actually like to do this myself in my upcoming build.
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