Ale-Superbike

Hello I just bought a throttle body mod 4s of 997 for my 2009 996 Carrera 2 2003. The original throttle body diameter '75mm like this and '85 mm. Now I need the plenum for this change. As the throttle body and the 4s 'very similar in diameter to that of the GT3 996 (maybe the 997) I wonder if the diameter of plnum and' the better of my carrera.

nick49

huh???

don't exactly understand your post.

Anyway, is the larger plenum and tbody supposed to translate into more power and acceleration? I'm curious, without a bit more lift and duration on the cams, larger valves, a tad higher compression, a little clean up of the ports and a few more CCs, if this will actually help at all. It could even hurt your acceleration as the inlet tract on most all motors is too large for all but upper midrange and top end. Or are you just trying to pick up a couple of ponys over the 6000-7000 rpm range at the expense of losing a bit on the bottom?

I admit, I don't know anything about what effect it will have on the 996 motor, but I know what it would do to motors in general. I work with this stuff everyday.

I'd like to know more. Thanks, and GL.

Ale-Superbike

Sorry for my English. I bought this throttle body bigger because I see that many on cayman turbo fitted to the GT3. So now I find pleum to mount it.


You say you will lose at the low speeds? Even if I mount a sports exhaust and ECU?

xel996

+1 on the huh???

2K7TTMIA

^^what they said^^ Ale-Superbike, have you done baseline numbers on a dyno?

By creating a larger intake cavity, there are some advantages but you maybe even causing poor airflow ( not restriction) in the process.

I also agree you will have some poor bottom RPM response. Eitherway, minimal gains may be achieved by porting the stock TB and plenum. An improved exhaust is good and with an ECU flash, yes the engine response will improve, but I think you should get the car on a dyno and datalog your numbers as you go....
Good luck and keep us informed.

Ale-Superbike

Before I do a bench test with the original machine and then pleum and throttle body of the 997 4s. The problems and 'I have no pleum, someone has pictures pleum of 996 to 997 GT3? Measures?

2K7TTMIA

I don't have a godd picture of the original plenum or measurements....then I think you should do the install with minimal sacrifice and see if the car runs good. if it runs sluggish, or hard to accelerate, then you have a problem...

Paul 996

Ale,

It is a little difficult to follow your question but we can be patient and will try to help.
It seems like you wish to use a 2009 C4S throttle body (that would have the 3.8L engine) on a 996 with a 3.6L engine.

The throttle body should bolt to the T portion of the intake plenum and that should be the only piece that you need. There is a chance the the bolt pattern for the throttle bodies is the same (this should be easy for you to check).

For the record, FVD has sold an enlarged throttle body for the early 996 3.4 cars and for the 996 3.6 cars that is 100% bolt on. Also as you mention Softronics has been using larger throttle bodies with tremendous success on Cayman but also with additional chip tuning.

Good luck.

Paul

Pac996

Ale-Superbike it all makes sense to me but I don't know the answers. I'd ask Ape Race Parts http://www.aperaceparts.com/ What I figure you'd need is measurements required of both ends. But then I always prefer to figure asking guys that have made real results in power than asking shops and dealers of porsche that don't have much for options or power. Porsche is a sad state of affairs for engine and other upgrades.

What kind of bike do you have? I've got the K6 GSX-R1000

Ale-Superbike

Yes you heard right, I mount the 997 TB of 4s of 2009 on my 996.I have a mechanic who can build the plenum to measure, put a picture of how I achieve it. This' similar in shape to that of the turbo, not the shape y as the IPD, okay anyway?

Ale-Superbike

Uppppppppp .

philooo

I just stumble across this post.. did you succeed ?

if anybody can chime in, about 996 throttle body upgrade, I am just curious as I see some gt3 throttle body for sale out there and I wonder if that is a match or of any use.

I think my car got plenty enough power but that is a relatively cheap upgrade if it works. I assume an ECU flash is needed to take advantage of it.

phil

riddler777

wanted to bump up this thread.

I might have a chance to get my hands on early 3,6l 996 GT3 (cable) throttle body 95mm diameter with plennum, it seems that it is possible to simply replace it with my existing cable throttle body with stock 74mm diameter (or something like that)

I am planning to flash the ecu in spring as well, but has anyone encountered this? any noticeable benefit, or just a waste of time/money I assume I would also need to fab up all the pipes from air filter as well or replace the stock box with appropriate diameter "performance" filter etc.

thanks, any reply appreciated to this silly question.

Chi-Town

I have been wondering the same thing. Will a non e-gas Mk1 GT3 throttle body fit in place of the "T" plenum and standard throttle body?

peteb3

Not sure if this is what people are asking about, but I have installed a 997 GT3 82mm throttle body on my 2002 996 C4S, I have also added an IPD 82mm Competition Intake Plenum
Fairly quick and easy install

Car does have Fabspeed carbon intake and Tubi/Fabspeed exhaust as well

as far as results - very subjective as I have not dyno'd the car, but there is definitely a positive improvement in throttle response and pull ("feel")