built motor BBK Full 420tq/485whp
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EvoM Guru
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From: Tri-Cities, WA // Portland, OR
Mrfred, take into account that the cat is also a factor for exhaust manifold pressure as well... anything that can hinder exhaust flow I would assume drive up the turbines back pressure which would result in an increase in exhaust manifold pressure... that is just my idea of thought...
Nah, the GTSpec is fine. The downfall of this manifold is the lack of lifetime guarantee.
Great numbers MRFred! i know there is a bunch left in it.
His cardboard Airbox is super sweet
He convinced me to make one too, could tell quite a difference in intake temps when logging.
His cardboard Airbox is super sweet
He convinced me to make one too, could tell quite a difference in intake temps when logging.
I can't believe you've got that much tq going thru the stock clutch. I keep wanting to swap mine out (recently went hta green) but I guess I'll just run it into the ground. Great powerband btw...that full can really spool
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From: Tri-Cities, WA // Portland, OR
I'm only pushing 420 ft-lbs in 1st thru 3rd gear. I've got 4th-6th gear detuned to about 390 ft-lbs. Trying to preserve clutch and 6-speed. :-)
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From: Tri-Cities, WA // Portland, OR
Nice work Fred. I have some interesting things to share based on your data.
Low compression engines take a hit to volumetric efficiency (on the order of ~10%) when the Pexh is higher than Pin. This is less dramatic with higher compression engines (14-18:1), but is still present.
Can you share what sensor you used and how you mounted it to the turbo manifold?
Time to get that Ball Bearing BBK
Low compression engines take a hit to volumetric efficiency (on the order of ~10%) when the Pexh is higher than Pin. This is less dramatic with higher compression engines (14-18:1), but is still present.
Can you share what sensor you used and how you mounted it to the turbo manifold?
Time to get that Ball Bearing BBK
Last edited by R/TErnie; Jan 22, 2012 at 02:23 PM.
Thread Starter
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
Nice work Fred. I have some interesting things to share based on your data.
Low compression engines take a hit to volumetric efficiency (on the order of ~10%) when the Pexh is higher than Pin. This is less dramatic with higher compression engines (14-18:1), but is still present.
Can you share what sensor you used and how you mounted it to the turbo manifold?
Time to get that Ball Bearing BBK
Low compression engines take a hit to volumetric efficiency (on the order of ~10%) when the Pexh is higher than Pin. This is less dramatic with higher compression engines (14-18:1), but is still present.
Can you share what sensor you used and how you mounted it to the turbo manifold?
Time to get that Ball Bearing BBK
I've been using Kavlico pressure sensors. Not cheap, but they've been holding up well to a variety of environments including exhaust gas and E85. I've got a pretty decent separation between the sensor and the exhaust manifold. The sensor is actually sitting in the engine bay above the fuel rail, and I connect to the EM using 1/8" stainless tubing and Swagelok (only the best) fittings. I was a bit worried that the 1/8" tubing would be too restrictive for rapid response, but so far, the response looks excellent.