our first ported oem intake manifold
#29
2 Props,3 Dildos,& 1 Cat
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Join Date: Jun 2005
Location: Fake Virginia
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Yeah I'm still unconvinced that it's a worthwhile mod but then I haven't seen apples-apples dyno plots comparing a stock 99, 01, gutted 99, and Keith's dual runner style 99, and an 01 with the VTCS removed.
But I'd like to.
Oh Reeeeeknownnnnnn?
But I'd like to.
Oh Reeeeeknownnnnnn?
#35
I am working with Ben at DIY Autotune about testing the different Manifolds for us. We hope to have dyno results soon. Its nice to keep things unbiased.
One thing we would like to make clear is that we are trying out a few different porting Theory's on the manifold, one may work better then the other. However we have an awesome Porting team that have mad porting skills yo! LOL. In all honesty though our team has years of experiences and will be applying what they know and and have seen work in past projects.
#36
In turbo applications, I understand you are also looking for additional volume, so you probably want to remove as much material as possible.
Before:
After:
#40
Yes, with a turbo, you should have constant boost, so the engine will be flowing more air, which means more power.
With a positive displacement supercharger, it's a little different. The supercharger will pump almost the same amount of air with 2 psi reduction in backpressure (boost). Lowering the boost, by reducing the engine restriction, will reduce the HP required to turn the supercharger, and allow the supercharger to pump a tiny bit more air.
I'm going to the dyno later this week, and intend on doing a run, with the butterflies in reversed position (open at low rpm, and closed at high rpm), to see what the HP difference is. I would expect there to be a larger difference with a turbo.
With a positive displacement supercharger, it's a little different. The supercharger will pump almost the same amount of air with 2 psi reduction in backpressure (boost). Lowering the boost, by reducing the engine restriction, will reduce the HP required to turn the supercharger, and allow the supercharger to pump a tiny bit more air.
I'm going to the dyno later this week, and intend on doing a run, with the butterflies in reversed position (open at low rpm, and closed at high rpm), to see what the HP difference is. I would expect there to be a larger difference with a turbo.