my spool results of log vs tubular manifolds logs spool was faster but make was less
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my spool results of log vs tubular manifolds logs spool was faster but make was less
engine is a 100% stock f20c. 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.
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.
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Re: my spool results of log vs tubular manifolds logs spool was faster but make was l
nice! been waiting for someone to do a test like this again. I always felt like that full race manifold test with the tubular log vs the ramhorn was a lil bias:p All in all which manifold setup was the most "fun" to drive around on the street with?
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Re: my spool results of log vs tubular manifolds logs spool was faster but make was l
With the tubular manifold the cars top end power was much much better as I gained 60whp on straight 91 octane. These results were only exaggerated even more on e85/race gas.
For a street car for a t3 undivided setup u want a quality manifold that wont crack with a 4-1 mearge coolecter with the shortest runners possible.
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Re: my spool results of log vs tubular manifolds logs spool was faster but make was l
Thanks for the info... It's really good to see this type of data especially on an F20
I've had many unofficial tests on spool, but the relationship is never a "one size fits all" type of scenario though.
With a small turbine wheel, it's easy to saturate the manifold full of exhaust gases and spool up the turbo quickly. A small turbo will spool quickly with a short runner manifold and when the engine size vs turbo sizing is within very streetable regions. e.g. GT30R on a 2.0L
With a larger turbo, like a GT42R or bigger, it demands exhaust velocity at the turbine wheel to spool up. Because the turbine wheel is so big, it doesn't fully rely on bulk exhaust flow and pressure to spool the turbo, but rather the high exhaust velocity and energy to "crash" into the wheel and get it going. This is when longer runners can allow exhaust gases to maintain velocity, and along with a nice merge collector, it can achieve highest velocity just before the turbine wheel. With equal length in mind, it keeps the pulses evenly spaced for best spool up and response.
You will quickly find that a log manifold with a massive turbo will never spool up properly and very slow to reach peak turbine speed. For example, a B18C with a 67mm T4 turbo will simply hate a log manifold or any type of short runner unequal length manifold.
I've had many unofficial tests on spool, but the relationship is never a "one size fits all" type of scenario though.
With a small turbine wheel, it's easy to saturate the manifold full of exhaust gases and spool up the turbo quickly. A small turbo will spool quickly with a short runner manifold and when the engine size vs turbo sizing is within very streetable regions. e.g. GT30R on a 2.0L
With a larger turbo, like a GT42R or bigger, it demands exhaust velocity at the turbine wheel to spool up. Because the turbine wheel is so big, it doesn't fully rely on bulk exhaust flow and pressure to spool the turbo, but rather the high exhaust velocity and energy to "crash" into the wheel and get it going. This is when longer runners can allow exhaust gases to maintain velocity, and along with a nice merge collector, it can achieve highest velocity just before the turbine wheel. With equal length in mind, it keeps the pulses evenly spaced for best spool up and response.
You will quickly find that a log manifold with a massive turbo will never spool up properly and very slow to reach peak turbine speed. For example, a B18C with a 67mm T4 turbo will simply hate a log manifold or any type of short runner unequal length manifold.
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