Originally Posted by jaatlee

PianoProdigy,

Do you still have the Cayenne Turbo S 84mm Manifold, Throttle Body and Y pipe for sale?

Jeff

Originally Posted by rbb1991

I am selling a brand new Turbo S 84 mm manifold and throttle body, Y-pipe and cover for $1400.00 shipped, only for the US. Shipping outside of the US will have to be paid for by the seller. I bought this power kit from PianoProdigy, but I have not installed it. I accept paypal.

Originally Posted by jdubbya

Digging up an old but very cool thread during some research into upgrading intake on my '05CTT. So it seems that on the 955's there was no upgrade to the throttle body or manifold with the iE81 power kit. So even though they got the bigger intercoolers the intake stayed the same.

Seems like it would be a ripe spot for some serious improvements then, IF there is a reasonable way to increase the throttle body and intake size. But the larger throttle body won't just bolt onto a 955 manifold will it? Couldn't possibly be that easy could it?

Just thinking and asking questions.

Thanks!!

Originally Posted by loxxrider

I can take some measurements on my 957 CTTS, but I believe the bolt pattern is different to accommodate the larger diameter throttle body. I would add that a larger diameter throttle body isn't going to be worth your effort on a turbo car. You could have a 2.5" TB or a 3.5" TB and the difference in power would be minimal compared to what it is on a naturally aspirated engine.

For example, I've been told the difference between a 957 CTT and 957 CTTS at around the 600-650 hp level is roughly 20 hp due to the larger TB, intake manifold, etc. A 20 hp gain would be sweet on a Honda making 150 hp, but it doesn't feel like much when you're already making 600 hp or so (13% gain vs 3% gain!)

Originally Posted by jdubbya

Digging up an old but very cool thread during some research into upgrading intake on my '05CTT. So it seems that on the 955's there was no upgrade to the throttle body or manifold with the iE81 power kit. So even though they got the bigger intercoolers the intake stayed the same.

Seems like it would be a ripe spot for some serious improvements then, IF there is a reasonable way to increase the throttle body and intake size. But the larger throttle body won't just bolt onto a 955 manifold will it? Couldn't possibly be that easy could it?

Just thinking and asking questions.

Thanks!!

Originally Posted by SeattleTurbo

I've extensively looked into intake manifold and throttle body upgrades for 955 (as well as turbo, exhaust manifold, intercooler, intercooler piping, transmission, engine internal, etc lol). There's nothing out there for us and we can't use the 957 stuff because of fuel system differences (we aren't DFI) even though it seems that it would match up as far as ports being in same location, etc.

Maybe we can port our stock throttle body/intake manifold opening, but I don't think the gains would be worth the effort and I'm not even sure if that is possible.

Originally Posted by SeattleTurbo

I've extensively looked into intake manifold and throttle body upgrades for 955 (as well as turbo, exhaust manifold, intercooler, intercooler piping, transmission, engine internal, etc lol). There's nothing out there for us and we can't use the 957 stuff because of fuel system differences (we aren't DFI) even though it seems that it would match up as far as ports being in same location, etc.

Originally Posted by Renaissance.Man

+1... the fuel rail in the 4.5 will most likely be your biggest issue. However, I am sure if someone was determined, they may be able to port match the 955 intake manifold to accept the larger 84mm TB (hopefully the TB electronics are a direct swap).

If so, then opening up the plenum, chargepipes, and intercoolers would be worth it.

Originally Posted by jdubbya

You wouldn't have your old smaller one sitting around would you?? I could at least compare and see if the electronics look the same if I could borrow it.

Originally Posted by Renaissance.Man

This is one of my last mods - gleaming the performance adders from the E81 powerkit that you can buy from Porsche NA to retrofit your Cayenne Turbo into a Cayenne Turbo S for approx $20K.

This will add an additional 40 hp and provide much better throttle response.

So since I did all of my homework, I will be doing this for much under that price

According to this P-doc, this is what I will need to add to get the engine performance bumped up to CTTS specs for a MY08 CTT (not concerned with small handling tweaks and 2-piece brakes in kit, only engine performance):

• Replacement primary cats - Presumably less restrictive.

• Much larger 82mm throttle body and port-match intake manifold - The main power-adder. Stepping up from 76mm TB .

• Replacement plenum to fit larger throttle body - necessary costs to mate up.

• ECU tune for more boost - bump up boost levels and other tweaks.

Note: Unlike the 955, no need to replace intercoolers or chargepipes for retrofit. Unlike the 958, no need to replace turbo turbine wheels for retrofit

Coming into this I already had the primary downpipes replaced without any restrictions - so check that one off the list.

I also already had an ECU tune that I am told by Softronics is identical to the Turbo S ECU tune - so check that one off the list as well.

Along with some basic maintenance, I will have to secure the other items. After a little online clicking, waiting, more waiting, it all finally arrived!

Quick preview pics:





















Pretty sexy, huh? Stayed tuned.. I will be doing the install over the weekend and will update this thread!

Originally Posted by Fastone2k

Do you still own this beast and if so are you willing to sell? Also I'm trying to Source the intake manifold used in the E81 powerkit. For a 958 Turbo. Would you know where to Source it?