High performance plenum system for aftermarket EFI ?

[Mark Henry]

Originally Posted by targa72e

The 964 plastic intakes are reported to flow better and more even than the earlier cast aluminum. The early aluminum 964 intakes also had a dual stage throttle body and the later plastic have a single throttle body. Plastic is considered a upgrade on 964 with aluminum intake.

john

Cool.
I should be ok seeing as my engine is a smaller 3.0

As for the TB ...I don't have one! I don't have the center sections.
That will be my next question!

I have a 60mm Ford TB, but I'm sure it will need bigger than that. I'm removing and tearing down a 996 engine tomorrow, I'll see what size it has. Again I won't really know what I'm looking at till my 964 intake arrives.
What size TB does the plastic intake have?

[Mark Henry]

SDS is just called and is shipping my ECU back.
Brand new spec once I download the latest software and full data logging.

Ross and Barry at SDS turned it around in less than 2 days.

[targa72e]

FYI,
for comparison the stock throttle body on 3.2 Carrera was 63mm the 964 3.6 is 68mm.

john

[Mark Henry]

Originally Posted by targa72e

FYI,
for comparison the stock throttle body on 3.2 Carrera was 63mm the 964 3.6 is 68mm.

john

That's smaller than I thought.

It would be cool to be able to experiment with a couple different sizes of TB. I still think the 60mm Ford (4.2 F150) I have will be a bit small but they may have a few Ford sizes I can try that's the same mount pattern as this TB.
So far no luck finding an interchange guide to see if the bolt patterns are the same as others. I may have to take a trip to the local scrap yards.

[Mark Henry]

Just measured a 996 3.6 TB and it looks like 73mm.
The Honda's have some different TB sizes in my range, might be a better option than a Ford TB.

I would like to find different sizes 65-75mm, but the same bolt pattern, so I can test them. Also some TB's you can buy aluminum spacers, which will be perfect as a TB base plate for welding to a new center section.

[winders]

You could just use restrictors.....

[targa72e]

Since you are looking at making your own cross over tube to mount the throttle body maybe you could make it so it directs the intake flow like the IPD plenums.

https://www.ipdplenums.com/

john

[Mark Henry]

Originally Posted by targa72e

Since you are looking at making your own cross over tube to mount the throttle body maybe you could make it so it directs the intake flow like the IPD plenums.

https://www.ipdplenums.com/

john

Get out of my mind!

I have a IPD plenum here that I'm going to be looking at.

[Mark Henry]

My 964 intake halves arrived last night.

I have to figure out the the stubs and center section details, might take a while as I'm super busy restoring several 914 2.0 Djet engines plus other projects this spring/summer. We'll see how much energy I have left over on the weekends.
A 914world buddy is sending me the stubs and fuel rails, not sure if I will use them but anything to help the design or build is a good thing.


The EFI install itself only takes a weekend, it's the crank trigger and intake fabrication that sucks up the time.
I could buy off the shelf... but where's the fun in that?

[Mark Henry]

BTW I can weigh these if anyone wants, one of the arguments is that plastic is lighter. This likely is true but these manifold halves are pretty light, I'm not worried about the weight for my build.

[Blamecanada]

Intakes look good. Definitely watching and stealing all your good ideas. Ha ha.

[Mark Henry]

Originally Posted by Blamecanada

Intakes look good. Definitely watching and stealing all your good ideas. Ha ha.

Is this why you have an intake WTB in the Canada section?

Post or PM me your build details, happy to help.

[Blamecanada]

Yes it is. Taking a 3 liter Weber carb and going with EFI. Likely with coil on plug. Also planning on fabbing a junkyard supercharger set up. Still humming and hawing over intakes and ECU’s. Did look at SDS. They are a consideration.

Steve Mc.

[Mark Henry]

Originally Posted by Blamecanada

Yes it is. Taking a 3 liter Weber carb and going with EFI. Likely with coil on plug. Also planning on fabbing a junkyard supercharger set up. Still humming and hawing over intakes and ECU’s. Did look at SDS. They are a consideration.

Steve Mc.

Sent you a PM

[Mark Henry]

Things will progress very slow, as I've taken on several 914 2.0 engine builds, so likely this will be this coming fall/winters project.

But....My cheap $66 (Canadian with shipping) Ali-express 70MM TB arrived from China today and it looks good enough. This is a universal TB so it doesn't have extra holes and crap. I'll have to figure out how to do the throttle cable as it looks like the wheel take standard bicycle cable ends.

[Mark Henry]

TPS mount doesn't line up with this bosch 3 wire TPS I have, but it fits the D shaft end. It will be easy to make a new mount plate and it will just be a bolt on mod to change the existing mount.
I'll also try a Honda TPS to see if it fits better.

[Mark Henry]

The huge bonus is it came with this 9/16" (1.5cm) thick mounting flange (with bolts) that I can weld to the custom center section I will making.

It has an idle stop, but no idle air bypass screw, so I'll have to crack the plate open a bit for idle or another option is to drill a hole in the throttle plate.

[Walt Fricke]

I wish I had 240 in my garage - then I might learn how to TIG (my attempts with a friend's set were what one might expect, though functional for their purpose). Does the manufacturer make smaller ones? Maybe ITB material?

[Mark Henry]

Originally Posted by Walt Fricke

I wish I had 240 in my garage - then I might learn how to TIG (my attempts with a friend's set were what one might expect, though functional for their purpose). Does the manufacturer make smaller ones? Maybe ITB material?

It took me hours of searching ebay. amazon, aliBaba, wish, etc to stumble across this one. I found a bunch of TB's for Hondas, Acuras, Mustangs, etc, but they all had extra crap I didn't need.
This one is a universal TB that's not made for a particular car, I liked it because it didn't have stuff I didn't need.

Basically you'll have to spend the time going through AliBaba searching for "40mm throttle body" then "41mm throttle body" then "42mm throttle body" and so on and so on.

Good luck!