991.two

Would that be flywheel HP?

spdracerut

it's significant added cost for a benefit the vast majority of customers wouldn't notice. There is the cost of doing the coating plus the cost of shipping the turbine housing twice, to coating supplier and back. Porsche is a mass production company, so the bean counters are very active.

spdracerut

on ethanol.... I think it could be wheel. Guys are hitting low-mid 500s at the wheel on pump gas with mods.

spdracerut

I was wondering if driving around a bit with moderate throttle where possible, 30ish miles, would be good to do before retuning to get the fuel trims to settle down.

Cheshi143

Wouldn't make any sense, once power is removed from the DME, the adaption disappears. If the tuner is competent, they can take the pressure map of the turbo's into account and make a initial test tune that will be really close. From there is it a game of what adaptations they can make to the tune based upon data logs. It is important to note that any logs that are retrieved from the DME are going to reflect the resolution of the minimal amount sensors the 9A2B6 has.

spdracerut

Good point after the reflash erasing the fuel trims. The on-vehicle sensors are good enough for tuning if doing a conservative tune. Not like the older cars with narrow band O2. Modern O2 widebands and the 991.2 even has individual cylinder knock detection.

fsmich

600whp would be impressive! But probably a dyno whp "conversion" to bhp.

Cheshi143

It will be interesting to see. Preliminary date shows that the GTS compressor and turbine is capable of producing great power. From what I understand, once you free up the air intake restriction, the operating environment for the turbos is greatly improved. On other models that have been tuned by APR (Audi 2.5T, Audi 3.0T, Audi 4.0TT) improving the air inlets has led to much greater increases than a tune with the OEM counterparts.

I look forward to the data once released.

fsmich

Large Puppy was questioning 600hp on stock components and I too would be surprised to see 600whp on a stock gts.

Das14444

If porsche will allow me to select paint to sample for my air vent slats and I can have a quote of my choosing engraved in my door sills - porsche could make an option to have the turbos (and any parts prone to rust) coated from the factory. The bean counters can mark the cost up 300% and stay happy. But give me an option to have a porsche without rust. Its actually pretty sad IMO...brand new car with visible rust.

who are the vast majority of porsche customers?
Enthusiasts, purists, drivers, likely the minority and most sell to professionals that want a status symbol and will never work on the car, don't even know where the turbos are located - actually they don't even know the difference between NA and Turbo motors.

Cheshi143

There is NO coating that exists that will prevent the cast turbos from oxidizing.

Das14444

too hot?

911BOSS

Mark, thanks so much for taking the time for the photos and write up. This maybe a bit off topic, but in doing all this work could you determine if the Turbos need to be removed in order to replace the spark plugs? The thread discussing this topic left the impression that the turbos prevent access to the coils and plugs.

991.two

No way. Turbos are on the outer perimeter of the engine and low. Not in the way at all.

991.two

Well I took a better look today and I take back the answer I sent you. Looks like the turbo oil & coolant lines are in the way. The heat shield on the head looks a difficult to remove also. I'm not sure if you have to remove the turbos, but it would be easier if they were off and out of the way.
I might have spoken to soon.