Inlet manifold for ITBs on 944 S2

[JamesO]

From experience the 968 manifold will bolt up to the S2 head.

 

[colin944]

The 9m manifold looks good but the first one looks wrong to me. Why would you move the injectors away from the head?

 

[edh]

OK try this

thread is 17 pages..

http://forums.rennlist.com/rennforu...t-more-power-out-of-na-looking-for-400hp.html

 

[J.C944TurboMan]

I came across this on the US ebay and at a bargain price ! Looks more engineered than the S2 inlet ? Wonder if this will gain more BHP on the S2 ??

http://www.ebay.com/itm/Porsche-968-Intake-Assembly-including-Manifold-TPS-Switch-Throttle-Body-Cable-/161169991684?pt=Motors_Car_Truck_Parts_Accessories&hash=item25867ae804&vxp=mtr


I tempted to buy it myself if it will increase the BHP ?? So question is does anyone know if the 968 inlet manifold will produce extra BHP ?

 

[Mac944]

ORIGINAL: Indi9xx

Talk to Colin at 9m, I know a few years ago he made up some manifolds to test throttle bodies on a 968 but I do not think he ever finished the entire project, so he might still have the manifolds he made and would be able to tell you what throttle bodies they were designed to marry up to.

Cams in any car really need matching to the dynamic of the intake among other things, and the S2 and 968 cams are extremely conservative even for the standard intake arrangement. In fact, all 944 cams are seriously mild.

Just emailed them (as I've been caught up in meetings most of the day), will see what they say!

 

[Mac944]

ORIGINAL: edh

OK try this

thread is 17 pages..

http://forums.rennlist.com/rennforu...t-more-power-out-of-na-looking-for-400hp.html

Wow, that is pretty epic!

 

[Andy97]

You can change the cams in CSCC Future Classics and Modern Classics, and fit ITBs and intake manifold if you can find suitable ones. The interpretation of "original induction" is still quite broad in CSCC! Basically it means that if originally on carbs, you have to retain carbs. If on injection you can retrofit carbs, retain injection or fit ITBs! You can't fit turbos or superchargers to a car type that was not originally forced induction, so this means that you cant do a 16 valve S2 turbo!

In the case of my own 924S that I race in the 1800-2500cc class of Modern Classics, I am seeing Augment Automotive shortly for a new cam, fuel pressure regulator and their ECU to try to find some additional horses and torque! I believe that Tom at Augment has done work on an S2 that races in FC before and would probably be keen to look at cam profiles for the S2. He certainly was for me, and I believe that he has worked with Piper to specify what was needed.

 

[Mac944]

Thanks Andy, that's very useful. It seems my initial plan was fairly conservative in terms of what is allowed under the regs.

I have spoken with Tom in the past and although his ECU could work with an S2 it requires keeping some parts from the 2.7 housing, 8v DME and wiring harness. I'm still in two minds about doing that over using a stand alone race proven ECU that can be tuned by pretty much any good rolling road.

With most after market ECUs you also get a bunch of other features built in as well as flexibility, available spares, service, support etc. I've no doubt that what Tom has produced is excellent and have heard really good things, I need to weigh up risks vs costs.

 

[Mac944]

Thanks to everyone for your help.

As an update I have spoken with Piper, the cams will be sent to them on their return after Christmas/New Year.

The block is being sent off to be re-nikasiled/alusiled (I forget which).

Pistons, rods, crank and clutch housing are in the machine shop being zero balanced.

Manifold will be measured up over Christmas for modification to accept ITB.

2.7 engine has been removed.

Brake servo needs to be relocated to make room for ITB setup. May have to resort to installing a pedal box.

Measuring front-end for for steel for partial space framing this weekend.

New ECU, looms to be installed and rewire dash.

Brake lines to be replaced.

New fibreglass front end and paint.

Then dyno for initial setup/mapping.

Then finally track day for final setup.

Quite a list but I'm hopeful it'll be worth the effort :S

 

[edh]

sounds like you're getting very serious about this [] - look forward to seeing the results

 

[Mac944]

As an update it looks as though throttle bodies on a modified manifold is doable.

There are a couple of things I'm a bit unsure of:

Which sensor do I use in place of the MAF, do I use MAP and throttle position sensor or something else?

The race series I run in requires the car keeps its original silhouette and I'm concerned at the amount of clearance I have under the bonnet, unfortunately the engine is out of the car so I have no way of measuring the gap.

If anyone has an S2 to hand would you mind measuring the gap between the top of the manifold and bonnet at both the front of the manifold (nearest the bumper) and back (nearest the bulkhead).

If I don't have enough clearance I'm wondering how viable an option it would be to solid mount the engine but at the same time run shorter mounts in order to provide enough clearance at the top of the engine?

 

[Hallsy]

When you ditch the MAF you would usually use a MAP sensor and also an IAT (Intake Air Temperature) sensor.

You can run some aftermarket ECU's without a TPS, but I would think it's still worthwhile to use it.