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Anyone using a 964 Plastic manifold?

Just wondering if anyone is using the plastic intake on their turbo engine. I think I am going with on my engine. The engine I have came with the Pat Williams Racing EFI conversion using the stock 930 intake. I am going to fab some adapters to bolt the plastic intake to the PWR injector blocks. They are very pleasing to the eye and it seems it would be a shame to not use these. I will need to do some match porting of the injector block to the adapter although I thought about making some tapered adapters. I considered just tigging 2" OD tubing directly to the injector block but I am still debating that one. Those injector blocks are so f'ing expensive ($1300) I would hate to ruin one or both.

Is it prudent to keep the secondary flapper in the intake or replace it with open tubing? This is a track only car if that makes a difference.
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Old 11-24-2009, 10:21 PM
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I'm using the 3.2 plastic intake on my 3.8tt and its holding up just fine but i'm switching over to ITBs.
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Old 11-25-2009, 05:52 AM
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Quote:
Originally Posted by sprbxr View Post
Is it prudent to keep the secondary flapper in the intake or replace it with open tubing? This is a track only car if that makes a difference.
There's a guy over on Rennlist who runs a plastic intake (screen name Geoffrey) on his n/a 964 Cup car. He has his pinned open and is considering removing it as the flap has been known to break free and get ingested into the engine.
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Paul B.
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Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 11-25-2009, 06:59 AM
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Do any of you have issues with the rubber hose connecting the halves? I had mine come loose shortly after purchase on a big down shift. I don't know if it was pressure or just coincidence from vibration. I also don't know how tight Henessey had it tightened from when they worked on it. Do you upgrade the fasteners or do the OEM seem to work fine?
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Old 11-25-2009, 07:58 PM
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No issues at 1.3 bar. Just make sure eveyrthing is nice and tight.
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Old 11-25-2009, 08:18 PM
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Don't know if this helps to identify anything...

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Old 11-25-2009, 08:32 PM
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Does anyone know the ID of the 3.6 plastic intake manifold runners at the base where they mate to the head? My engine runs a 3.6 plastic intake and had no issues at 1.25 bar.
Old 11-27-2009, 04:47 PM
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1.6" or about 40mm
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Old 11-27-2009, 09:00 PM
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Hmm Im kind of wondering if the 964 plastic manifold can be improved on a bit with simple mods? Im running it with the intake ports port matched to the manifold so 40mm and I had my stock 964 TB ported to 71mm by FVD.

Still, I wonder if I am getting any pressure drop considering that I am boosting to 1.25bar with a GT4094r turbo (2.5 inch outlet)? I am using a Mode full width IC so really cant improve on that, but I wonder if I can reduce pressure drop further by going to a 75mm TB and substituting the stock plenum T with a fabricated Y like the ones IPD makes for the newer 996 and 997 Turbos?

This is a pic of the high flow Y plenum for 996 Turbos using 75mm TB.

http://www.roadsportsupply.com/IPD_996_Plenum_lrg_pic.html

Just thinking here - if I am even getting 1-2 psi of pressure drop due to the restriction of the TB and the plenum T that equates to hotter outlet temps from the turbo.

Does anyone here think that fixing this part of the intake track would result in more power?
Old 11-29-2009, 01:11 PM
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I recently had Chris Powell in Seattle install a 964 plastic intake manifold with an 80 mm Mustang throttle body on my 3.4 turbo charged engine. Call Chris @425-462-9296 if you have questions regarding the install. He is a master mechanic. Sad part is that I didn't get any more rwhp than when I was using my 3.2 manifold with regular throttle body. Even going to 1.2 bar did not change the stats. By the way I went to a larger intercooler from my Kokeln. I get much better throttle response at the low end but no increase from the 492 rwhp I originally started with.
Old 12-04-2009, 12:40 PM
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Hi Kenny,

Thats interesting info thank you. What size are your intake ports? Cam spec? Turbo?

Im thinking because I have a huge hairdryer and will have big ports and GT2 cams it might make a small difference from say 6000-6700?

Im hoping for 600-625whp when I redo my heads and enlarge the TB a bit this winter.
Old 12-04-2009, 01:19 PM
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Quote:
Originally Posted by kenny3737 View Post
I recently had Chris Powell in Seattle install a 964 plastic intake manifold with an 80 mm Mustang throttle body on my 3.4 turbo charged engine. Call Chris @425-462-9296 if you have questions regarding the install. He is a master mechanic. Sad part is that I didn't get any more rwhp than when I was using my 3.2 manifold with regular throttle body. Even going to 1.2 bar did not change the stats. By the way I went to a larger intercooler from my Kokeln. I get much better throttle response at the low end but no increase from the 492 rwhp I originally started with.
Getting more top end power would take more cam to take advantage of the freer breathing, I'd think...
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Old 12-04-2009, 01:49 PM
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GT2,
I have stock heads, Evo cams, and a ball bearing Kokeln turbo. I am also running a MoTec system.
Old 12-05-2009, 11:13 AM
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I am planning on using composite Kevlar coated plastic intake designed to better handle boost. Marco has strong billet connectors. The injector blocks mate this my Carrera heads.

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Old 12-05-2009, 12:18 PM
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Jeez....How much boost are you planning to run BReyes?
Old 12-05-2009, 01:12 PM
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I'm surprised at your results as you surely are Kenny. One conclusion that comes to mind is that the Carrera intake is NOT the bottle neck with your setup. I'd assume from numbers I've read before that the 3.2 intake outflows the 3.0/3.3 CIS heads. Sure a bigger hose plumbing with flow more water through a small orifice than a small hose leading and trailing the same orifice. But increasing the orifice size will make a bigger change than either hose.

I bet your 'stock' head setup is the small orifice in your setup. Bigger intake and bigger exhaust with stock heads still leaves the restriction. I'm certain you've thought through all of this, but I'm still suggesting that the plastic intake may be a move in the right direction. It may just require the underlying support group to make it shine.

We've often found this in the boosted Mustang racers that a bigger intake/TB only really shines after bigger heads.

Chrysler racers are the worst I've seen of the just turn up the boost pressure. They obviously have much larger thermal reserve (H20) than us but the 2.2 Shelby guys just keep building a bigger damn infront of their 8v heads and hope eventually a little more squeezes through.
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Old 12-06-2009, 09:07 AM
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