IC and TB Pressure Drop Measured
#1
Rotary Enthusiast
Thread Starter
IC and TB Pressure Drop Measured
Used my industrial Dwyer differential pressure gauge, 3.58 psi range, to check some pressure drops. Stock seq'l turbos, ported efini y-pipe, greddy smic, usual intake and exh upgrades with hf-cat. Running about 9.5 psi at 7000 rpm, where max drops occured.
Used 3 measurment points:
1) hose behind y-pipe (goes up to check valve then pressure tank).
2) I made a tee, fitted in the AWS hose, for a before-TB tap at the elbo.
3) std upper manifold port.
2.9 psi drop from y-pipe to manifold ( acrosss IC + piping + TB )
1.5 psi drop from y-pipe to elbo ( across just IC and piping )
This implies 1.4 psi drop across the TB. I still have the double throttle valve, so this contributes some.
SCC measured about 1 psi across the M2's at 12-13 psi, and 2.5 across the stock IC. My 1.5 psi for greddy smic is a little higher than I had assumed.
Also measured very low .7" hg vac (-.35 psig) on top of K&N drop in, with mod'd stockbox intake. Had measured -1.2 psig a while ago, wth K&N and stock ducting to box. That inlet elbo to box limits airflow.
Will repeat measurments with stock IC next.
Used 3 measurment points:
1) hose behind y-pipe (goes up to check valve then pressure tank).
2) I made a tee, fitted in the AWS hose, for a before-TB tap at the elbo.
3) std upper manifold port.
2.9 psi drop from y-pipe to manifold ( acrosss IC + piping + TB )
1.5 psi drop from y-pipe to elbo ( across just IC and piping )
This implies 1.4 psi drop across the TB. I still have the double throttle valve, so this contributes some.
SCC measured about 1 psi across the M2's at 12-13 psi, and 2.5 across the stock IC. My 1.5 psi for greddy smic is a little higher than I had assumed.
Also measured very low .7" hg vac (-.35 psig) on top of K&N drop in, with mod'd stockbox intake. Had measured -1.2 psig a while ago, wth K&N and stock ducting to box. That inlet elbo to box limits airflow.
Will repeat measurments with stock IC next.
#2
Eats, Sleeps, Dreams Rotary
Good data....
do you have access to anymore parts to test? Rotaryextreme has a beautiful preproduction ported throttle body.....I would love to see the difference with that.
do you have access to anymore parts to test? Rotaryextreme has a beautiful preproduction ported throttle body.....I would love to see the difference with that.
#4
Rotary Enthusiast
Thread Starter
Originally Posted by 7racer
Good data....
do you have access to anymore parts to test? Rotaryextreme has a beautiful preproduction ported throttle body.....I would love to see the difference with that.
do you have access to anymore parts to test? Rotaryextreme has a beautiful preproduction ported throttle body.....I would love to see the difference with that.
search on 'dwyer' ... can get a 100" wc gauge like mine for $55. good investment for chuck?
I hate to take 12.5 at the turbos to put 9.5 in the manifold. that's about 4-5 psi excess backpressure to the exhaust ports.
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