Techno Duck

You can always just install a turbo timer. Take the key out, car will continue to run for designated time and shut off on its own. Same concept as the turbo water pump...just instead of a water pump the car stays running.

Rogue_Ant

IMO, if your not willing to deal with the minor inconveniences of a modified vehicle, then you should refrain from modifying it.
(not a shot at you, just my opinion on modifying cars)


Rogue

944CS

if you have to deal with minor inconveniences, then you're not doing it the right way. not a shot at you either.

Rogue_Ant

I guess your end-goals and amount of modifying are the determination for a 'stock-like' running vehicle.


Rogue

944CS

well, considering 400hp and 425tq @.8 bar are attainable with a stock like running vehicle, i guess you could say that. The only thing that wouldn't make any 944 with big hp stock like is if you are running a cam to support over 500 or so hp and no variable valve timing. Then it wouldn't idle like stock.

special tool

I think he is talking about a compromise of a combination street/track car.
My escorts, solid engine mounts and Momo race seats are a compromise for my *** when I hit a pothole.

nize

imo, people who remove the stock turbo coolant plumbing on a mostly-street car are either lazy, ignorant, or both. my argument is why not remove the radiator while you're at it?

from the garrett site;
Following a hot shutdown of a turbocharger, heat soak begins. This means that the heat in the head, exhaust manifold, and turbine housing finds it way to the turbo’s center housing, raising its temperature. These extreme temperatures in the center housing can result in oil coking.

To minimize the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after key-off. The layout of the pipes should minimize peaks and troughs with the (cool) water inlet on the low side. To help this along, it is advantageous to tilt the turbocharger about 25° about the axis of shaft rotation.

Many Garrett turbos are water-cooled for enhanced durability.

http://www.turbobygarrett.com/turbob...o_tech101.html

nize

imo, this is a mod that non turbo cars are forced to use when modded with a turbo that doesn't belong there. why would you want to do this when it's easier and better to simply retain the porsche-designed automatic turbo pump?

nize

i think pretty much all new turbos on the market today are available as water-cooled. this is another example of porsche being ahead of the times 20+ years ago. most people who don't use the turbo water cooling today usually choose to do so not because it's not available, but because they're too lazy to properly adapt the plumbing to fit the new turbo.

porschefig

what's the big deal? Tim says wet is an option...

FYI: I agree..new turbo will be wet or not at all!!

944CS

i guess i just don't understand why people would delete such an awesome feature. that is a feature i brag about. hell, if you get rid of it to simplify the engine bay, why don't you remove the oil cooler too! who needs that anyway....

nize

precisely. if wet is an option, why not go with wet instead of going backwards ?

tedesco

can anybody tell the conceptual difference to the Garrett or HKS T04Z turbos? Benefit of the Garretts are a wide range of turbine housing.

http://www.atpturbo.com/Merchant2/me...egory_Code=GTB

Tim already explained some of the difference to ordinary turbos. At least now it seems turbonetics will hand out some maps of the turbos they sell. Wonder how they compare to Garrett.

TurboTim

Watercooled vs. non watercooled turbos........I guess i can say a few things about both. We have used both for many year on many applications. On the 944 turbo specifically,we have had customers with 50,000 miles plus on non watercooled turbos.We have a seen a little longer liefspan with watercooled turbos. A turbo this large will require some custom piping to water cool it.Your stock thermoswtich housing and a brass fitting is not going to work. Sorry. Instead, you will have to run an-lines and fittings.If that is a problem for you, then dont buy this turbo or any T4 Garret turbo for that matter since this is a problem with all full T4 turbos, since the hotside and hotside inlet flange side is so large it makes it impossible to use the stock water fittings on the center section.Otherwise,keep it oil cooled only and cap off the factory waterlines.

TurboTim

After shutdown, the oil stops circulating and will drain right out of the bearing housing.The electric waterpump will shut off a few second after the car is shut down. So honestly,there is really not alot of cooling taking place to prevent coking once the car is shut down. A turbo timer will work much better since it will keep the car running and the oil circulating for a longer period of time.Removing an oil cooler is not like removing a little waterpump for your turbo,especially if the turbo is designed to not use watercooling.