riceball777

The only thing that was changed was the turbo manifold. All manifolds are t3 single/open scroll. The turbo was a old school garrett ball bearing t3 50 trim with a 5 bolt .63 ar hotside. First manifold was a rev hard log. Second manifold was a mase tubular sidewinder. Third manifold was a trackforged tubular sidewinder eaqule length manifold.

First manifold is a rev hard log

blue line is the most boost I was able to run on 91 octane showing just under 10psi. Red line was e85.



second manifold is a mase manifold. This manifold along made 60whp more on 91 octane at almost the same boost level but spooled 800 rpm slower than the rev hard log manifold.


red line is 91 octane and blue line is e85


Third manifold is the trackforged. Notice the runners are much longer than the mase manifold and this manifold had all equal length runners. This manifold made all most the same exact power as the mase manifold but spool 200 rpm slower due to the longer runners.


This grap shows the spool of the trackforged vs the mase. This shows 200rpm slower spool of the trackforged manifold. Boost plots showing 91 octane and 11psi on both manifolds.


A picture of my current engine bay with the track forged manifold.



This tells my the ideal t3 single/opens open scroll manifold would have a merge collector with all the runners being as short as possible and that eaqule length does nothing for power production. The shorter the runners the faster the spool.

SlowTeg

Cool comparison. It's not a big deal, but it looks like your Mase manifold spooled ~600 rpm later than the inlinepro, not quite 800rpm, since you were running more boost w/ the Mase right?

Also, you're only displaying rpm vs. boost. I think in order to make a true comparison whether equal length actually makes a difference you need to run the 50 trim at the same boost level w/ each non-log manifold, and tune each setup. I'd bet the gains would be negligible though from a true equal length compared to a non-equal length, especially without a big turbo and high boost. Thanks for posting your results!

On a sidenote.. I like those "old school" garrett turbos. They are generally very reliable, and the 50 trim is a solid turbo for this car.

camuman

The biggest Problem is the dyno operator can load up the dyno and effect spool. Need to have logs from being on the street. And you can tweak the boost controller if its electronic to influence spool

Thunder-rush

So what you think might have happened if you replaced the .63 for a .82 turbo housing with the revhard log? Maybe get the same effect as running the tubular units but without the hassle? It would be interesting to compare results from someone going log->tubular but with a big flowing turbo. I know King Perf made over 700whp on a log with big turbo. Thanks for sharing...

Reapur

It's not just the manifold you changed. The downpipe, the charge piping all change too when you switch manifolds. All these factors influence spool efficiency.

Tubular manifolds typically offer more efficient power production with less boost for same hp.

neeman77

You have to remember its the torque curve that matters not the boost plot since boost is just a measure of restriction. Ultimately its the flow that makes the difference in a log vs tubular setup and torque is the best measure of this all else being equal.

riceball777

I drove the car a lot with all these different manifolds and I can assure you that the log does spool noticeably faster and makes more power under 4k rpm.

4forall

Also note the title of the thread....

He just wanted to post the results of spooling vs rpm. For a street car i would use a log manifold any day, no cracks and nice spool.

camuman

no cracks MY ASS. and anyone with an electronic boost controller can manipulate the spool of a setup.

riceball777

The perpose of this thred is just to show the community the spool defferance with different manifolds.
I have a aem boost solinoid on my car with my aem ems so I can do boost by gear or by speed. But you cannot make it spool faster then whenever it spools. I assure you a log manifold although Inefficent will spool significantly faster and will make more power earlier as its spooling faster.