Hi. I just pulled the trigger on purchasing a 2008 Cayenne Turbo. I can’t leave any of my cars stock and I would like to learn what are common upgrades done to hit 700 + HP. I’m Ok with making custom fabrication.

Below are some of the things I’m considering:
* Custom 3” exhaust with X pipe and Magnaflow 3” Race Mufflers (or maybe non-race mufflers if the exhaust becomes too loud)
* Secondary cat bypass with straight pipe (does it throw check engine light?)
* How about getting rid of the restrictive first set of cats totally and running no cats or replacing the first set of cats with high flow 300 cel cats?
* Blow off valves. Can I use Tial Q or QR50 mm blow off valves?
* Custom cold air intake with high filters (similar to Evoms V-flow but with bigger filters and chrome tubing), custom Y pipe with 2.5 in or 3 in pipes
* Upgraded throttle body. Does GT3 throttle body fit Cayenne Turbo? Is there any aftermarket throttle body with bigger ports? Can the stock CTT throttle body be ported?
* Custom dyno tune
* 20x10 light wheels with 295/40 ZR 20 tires. What tires do you recommend for all season driving?

Also I want to install a body kit. What are some options available? Can the new Cayenne front LED daylight/signals can be fit to 957?

Thanks for all input.

 

Bottom line for OVER 700hp, your going to need different turbo's, custom turbo manifolds, and a short block would be a good idea. How many miles on that CTT? Im sure you could hit whatever power level you wanted on the stock block but eventually something is going to give. I can testify that bulding a motor would be much cheaper than putting a rod thru the side of the block and having to find a new core.

The 4.8 is quite a bit different than the 4.5 and there aren't very many, even used in the yards.

Realisticly building or even rebuilding a CTT engine is very,very,very expensive. As far as I know the only person in the country that even has a torque plate for the 4.8 is LN engineering. You could have one made to finish your cylinders for about 5-600$ for the one time use. Valve guides are not available, you will have to have them custom made. And that's one serious issue that needs to be addressed as the stock guides suck a**. The rods are nice peices, as far as power handling ability no one really knows. They use a small 9mmx1.25 cap bolt that is a torque angle/ stretch to yeild. Oh yeah, Porsche doesn't give specs as to new rod bolt vs max stretch permitted. Again, not worth the unknown. So basicly rods are mandatory. I could go on and on.

Right now I'm doing a full build on my 04 CTT and can help you with whatever questions you may have. Just Pm me Eventually I will post a thread and build with the results but that's still about 4 mo. away.

I'm doing a build on the 4.5 with rods, pistons, iron sleeved block, ported heads, and going to fit a couple efr turbos, custom fmic intercooler setup, relocation of ps oil cooler and trans cooler to old intercooler side ducts, no cats. For engine managment I'm looking at of course a stock ecm flash, haltech sprint 500, mapecu3, and proefi 128. With the last three being installed as piggy backed. Tuning, having mutiple maps, and integration of a control system are big hurdles here as well.

 

Thank you very much for the information. The 08 957 CTT has 50,000 miles.

Definitely, I'm not going through the whole trouble of building the engine and upgrading drivetrain. What I have in mind is to keep the engine stock, and basically upgrade intake and exhaust system to help the engine breathe and flow better.

Unless there is a bolt on turbo and intercooler upgrade option that doesn't cost much, I will keep the stock turbos and intercoolers.

I believer cold air intake, larger diameter intake pipes, Y pipe, a bigger throttle body (upgrade to Turbo S throttle body or GT3 if it fits), secondary cat bypass, full 3" exhaust with X-pipe will yield something around 650 HP with a good tune.

The stock brakes look good on the Turbo. If there is an inexpensive way of just replacing the rotors with 2 piece cross drilled ones and some nice pads, I'd like to do that also.

 

I would dyno it now, do primary cat deletes, water/meth injection and a tune. Then Dyno it again with the air filters in, and again with them removed. Let that be your deciding factor as to whether to upgrade the intake. The factory air intakes are TRUE cold-air. V flows will not be. Power per dollar that will get you the most. X-pipes are for n/a cars, you don't NEED one IMO, or a larger t-body. Just buy evoms DV's for your purposes. It's a twin turbo v8, you need boost and a way to cool it. That and the right tune will get you the power.
Your stock turbo's are going to be tapped out at that power level and generating a lot of heat. Expect the factory cartridge design and lifespan to be impacted.

Word to the bug bitten, there is NOTHING cheap on a Cayenne. No part, no service, no help. I'd really like to know the egt's on some of these Cayennes that are running high power on the stock turbo's. Stock, you have a nice package. There's a lot of mis-information and secrecy/unknown regarding the Cayenne. Be aware.

When you say "cheap or inexpensive" It makes me laugh...

On a side note, I have managed to build a motor, new tires, turbos, manifolds, fmic and all piping, water lines, oil lines, powder coat my wheels, partial exhaust, upper control arms, starter, alternator, and a ton of other stuff for quite a bit less than tuners are charging for just turbo upgrades.

* Did you know that a N/A Cayenne engine won the 24 hrs of Daytona in 2010?

 

I can tell you know a lot about Turbo Cayenne and Turbo engines in general. Having said that, do not underestimate intake and throttle body upgrade in TT engines.

I bet you I can pick around 30 HP with just upgrading all the intake piping to 2.5" chrome, doing cold air intake with larger conical K&N filters and change the throttle body (which I believe is 76 mm) with Turbo S throttle body (82 mm).

I know it's a total different animal but I was able to pick 50 Rwhp on TT Viper by only upgrading the throttle body to BBK.

Actually some of the mods will help reduce the temperature on the turbos like removing the secondary cats. In fact, if I can remove all cats and take care of the check engine light in the tune, it would lower the turbo operating temperature substantially. However, you will have a stinky daily driver that would burn eyes in closed underground parking lots

On a side note, the fastest cars do not use air to air intercoolers, but instead air to water intercoolers like the one I'm designing for the TT Viper. If you are going to fabricate new intercoolers for your build, i would recommend going the air to water route if it's not to much hassle for you to run the water lines and add a heat exchanger.

 

What is the deal with the Evoms Diverter Valve? Is it a blow off valve? If yes, why not use Tial Q or QR (depending on the space) 50 mm blow off valves and have the best flowing BoVs?

 

Have you really looked at the factory intercoolers? I think 2.5 is too big for the hot side unless your over 700hp. Maybe for post -intercooler. 30 horse sub 700hp, no way. Chrome? Actually wouldn't want that on my alum intake pipes. Unless you COMPLETELY seal the conical filters from the engine compartment it wont be cold air. The heat sheilds provided with most the cai's do nothing more than shield radiant heat. It's gonna draw from the engine compartment.
I would think primary cats would be more beneficial to reducing temps but I don't have data to back that up. I wont be fabricating intercoolers, there's no need to. I'm all about air-air for this application.

 

I'm planning to run 2.5" piping from the turbos to the intercooler (hot side) and on the entire cold side with Y pipe, etc. And yes I will be completely sealing the conical filters to have true cold air intake. Together with the Turbo S or bigger throttle body, I think it will yield substantial HP increase.

Also, it may help Tial 50 mm blow off valves instead of the tiny looking Evoms Diverter Valve?

Does anybody currently make bigger bolt-on intercoolers for the CTT? Are you planning to just use single large size intercooler in the middle, right in front of the radiator? If so, don't do it. Blocking the airflow to the radiator is never a good idea.

Have you looked into Tial Alpha 28 or Alpha 30 turbos that are available as bolt-on for the 993 and 996? It would be great if we could use them on the CTT without going through the trouble of making custom turbo headers.

 

I don't want to give away too much of what I am doing because quite frankly I'd rather present some hard numbers/results/data when its done than bench race the combo all over the place. Plus, there are so many ways to go fast. A lot of right ways, even more wrong ways.

I think you could get to 600 easy, still get ok mileage, and be very happy with a CTT that will last a long time.

 

Here is a picture of my Hamann Body kit on a 2008 CTT.

 

Hamann has a tendency to over do it.

 

Not bad, but I have seen body kits that flow better with the rest of the car. How about this one offered on Ebay?

http://www.ebay.com/itm/Porsche-Caye...torefresh=true

I'm not a big fan of 4 fog lights. If I can get all of the 4 fog lights out and use 2013-2014 Cayenne Turbo LED daytime lights and turn signals with this body kit, it would be awesome.

Has anybody tried using the 2013-2014 Cayenne Turbo LED daytime lights and turn signals on 957 Cayenne Turbo? I think the new LEDs function as both daytime lights and turn signals.

 

That kits looks a little like the Techart setup, which i have on mine, i like the 4 fog light thing, but i never use them.
I know it's possible to retrofit led DRL's, Philips do a good plug and play set, which i would like to fit to mine but the previous owner had the headlights wired so that they are permanently on, i can't physically switch them off.

Mines a 06 CTT with e81 powerpack and a few mods in the region of 600HP