Air intake manifold ?
#1
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Air intake manifold ?
Looking at a possible rebuild in the future. I see some have silver air intake manifold's. Are they spray painted or is this an aftermarket piece?
#4
Nordschleife Master
'89-mid 91 cars had aluminum intake plenums. Mid-'91 and onward had plastic plenums. They're supposed to flow the same but I think the plastic weighs less and is less prone to heat soak.
That FVD piece is modeled after the 3.8RS/RSR and has the throttle bodies at the bottom (individual) versus a single butterfly closer to the start of the intake tract. From what I've read, the powerband is not great for the street.
Lots of other builds use the GT3 plenum and ITBs. Magnus, Singer, Rothsport, etc. All those are GT3 plenums.
That FVD piece is modeled after the 3.8RS/RSR and has the throttle bodies at the bottom (individual) versus a single butterfly closer to the start of the intake tract. From what I've read, the powerband is not great for the street.
Lots of other builds use the GT3 plenum and ITBs. Magnus, Singer, Rothsport, etc. All those are GT3 plenums.
#6
Rennlist Member
#7
RL Technical Advisor
As an example, we did a stock 964 with ITB's under the OEM plastic plenum and a Webcam 20/21 (VERY mild) with near stock exhaust (G-pipe & cat bypass). This made just under 300 BHP with no other changes and is a ton of fun to drive.
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#8
Three Wheelin'
Originally Posted by Steve Weiner-Rennsport Systems
The ITB's as used under a plenum, stock or GT3, works VERY well with instant throttle response; something you never get with any single-throttle intake system.
As an example, we did a stock 964 with ITB's under the OEM plastic plenum and a Webcam 20/21 (VERY mild) with near stock exhaust (G-pipe & cat bypass). This made just under 300 BHP with no other changes and is a ton of fun to drive.
As an example, we did a stock 964 with ITB's under the OEM plastic plenum and a Webcam 20/21 (VERY mild) with near stock exhaust (G-pipe & cat bypass). This made just under 300 BHP with no other changes and is a ton of fun to drive.
#9
Race Car
Originally Posted by Steve Weiner-Rennsport Systems
The ITB's as used under a plenum, stock or GT3, works VERY well with instant throttle response; something you never get with any single-throttle intake system.
As an example, we did a stock 964 with ITB's under the OEM plastic plenum and a Webcam 20/21 (VERY mild) with near stock exhaust (G-pipe & cat bypass). This made just under 300 BHP with no other changes and is a ton of fun to drive.
As an example, we did a stock 964 with ITB's under the OEM plastic plenum and a Webcam 20/21 (VERY mild) with near stock exhaust (G-pipe & cat bypass). This made just under 300 BHP with no other changes and is a ton of fun to drive.
#10
Nordschleife Master
It's basically this setup (964 plenum over ITBs). Looks like it requires new engine management and all associated sensors. Kinda like the Specialist Components engine management kit that robt964 installed.
http://www.rothsport.com/Products/En...-Butterfly.htm
http://www.rothsport.com/Products/En...-Butterfly.htm
#12
RL Technical Advisor
#13
Three Wheelin'
Originally Posted by Steve Weiner-Rennsport Systems
Motec M84. The OEM Motronic cannot control an ITB system.
#14
This is what I'll be doing shortly - Rothsport EFI with AEM Infinity. Basically the same setup as the Bisimoto 911R. Went with AEM since it's the only ECU with knock control within my (increasingly out of control) budget. May add cams but not sure yet. Will start a thread once the work starts - I'm hoping to do a before and after dyno run.
#15
RL Technical Advisor
JMHO, there seems to be far more people around the country who know Motec more than any other racing Management system and thats a big advantage, depending on where you live.