top end breathing problem......intake manifold?
04-14-2005, 06:45 AM
#1
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top end breathing problem......intake manifold?
long story short.....my car isnt making very high peak numbers......set up is GT35R, 3 inch turbo back, tubular manifold, 84mm ls block, stock b16 head with crower valve train, 2.5 inch from turbo to IC piping, 3 inch from IC to TB. gsr cams, stock intake manifold. .63 t3 exhaust housing.....68mm throttlebody
the graph is amazing up untill about 6500 rpm, before that point it goes pretty much straight up...but where it should still be climbing, the power doesnt drop.....but it flattens out. toruque is good too...but right around the same rpm it slowly starts dropping, but not hard at all. no matter what changes are made with the managment or the cam gears.....the power will go up, but it goes up through out the whole graph, it doesnt make the graph climb. if that makes sense? more or less if adding a half degree of timing added 30 horsepower, it would be 30 horsepower increase from 6500rpm to 9500rpm. track times on the car are amazing for the power output, and the graph is perfectly smooth.
is it possible that the intake manifold could be the cause of this? i have a set of ITR and CTR cams im thinking of playing with as well. if anybody has any input or sugestions i'd apreciate it.
the graph is amazing up untill about 6500 rpm, before that point it goes pretty much straight up...but where it should still be climbing, the power doesnt drop.....but it flattens out. toruque is good too...but right around the same rpm it slowly starts dropping, but not hard at all. no matter what changes are made with the managment or the cam gears.....the power will go up, but it goes up through out the whole graph, it doesnt make the graph climb. if that makes sense? more or less if adding a half degree of timing added 30 horsepower, it would be 30 horsepower increase from 6500rpm to 9500rpm. track times on the car are amazing for the power output, and the graph is perfectly smooth.
is it possible that the intake manifold could be the cause of this? i have a set of ITR and CTR cams im thinking of playing with as well. if anybody has any input or sugestions i'd apreciate it.
04-14-2005, 10:38 AM
#3
Honda-Tech Member
Re: top end breathing problem......intake manifold? (Turbo-charged)
when you say stock intake maifold which one? stock B16 manifold?
and is a 3" charge pipe really needed?
and is a 3" charge pipe really needed?
04-14-2005, 10:46 AM
#4
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Re: top end breathing problem......intake manifold? (non-VTEC)
Considering there are no problems with these parts.....
-The turbo will have no problem making high end HP
-GSR cams have been proven to make power past 8500, so cams are out of the questions
Just actually read the thread. I have no clue what could be causing that.....
Unless there is a problem somewhere else, cams will dictate the powerband of a motor more than anything else. So if you cannot find any other problems and have an extra set of cams laying around, why not try em
-The turbo will have no problem making high end HP
-GSR cams have been proven to make power past 8500, so cams are out of the questions
Just actually read the thread. I have no clue what could be causing that.....
Unless there is a problem somewhere else, cams will dictate the powerband of a motor more than anything else. So if you cannot find any other problems and have an extra set of cams laying around, why not try em
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