How much HP will the tranny handle?

 

Mr Haney where in Texas are you located? Amazing you did that in 12 hours...

 

I don't know for HP, but I know it can handle up to 1000nm of torque.

 

I can cross-reference part numbers for you, if that helps. However, all it will tell me is if two parts are the same, not what changes were made. So that should be easier for the manifold parts and lines. However, since only the whole turbocharger has one single part number, so it will be will be a different part number than the TD04 on the 957, I will have no way of telling what parts are different inside that turbocharger - like impeller, turbine wheel, etc. Given they are from different manufacturers, I think it is safe to assume that all internals will be different, but complimentary to your engine.

Believe it or not, I already had that after sales training PDF and loads others available. If you want, I can share a few more with you - just send me a PM. My assumption when I went with the 4.8 was that is was just a bored/stroked 4.5 from the manufacturer. The documentation I have says that it only LOOKS similar and was actually completely redesigned from scratch. Probably makes since given the different turbochargers, direct fuel injection, and coolant flow improvements.

There is another member here who has the EVOM 957TT and he states the changes made in that kit, "Mayhem996TT". I am 95% sure that they are machined Garrett gt2860rs turbochargers as you mentioned. I could not find that thread right now, but can personally ask him if you want.

This is his 957TT on the dyno:



Sounds like a lot of work- I would probably look at other alternatives. Do you have a welder?

So the TD04's are not a third option? Why not look into this more?

What about just getting a used engine and doing a simple swap for less miles? You have around 180K on the odo, right? Why not look for a low mileage engine and just drop it in for a reasonable price?

Also why are you trying to replace the heads AND the block? Why not just the heads and if needed, pistons too?


That is fairly quick! Encouraging news indeed! Understandable on the focusing on the work, not pictures.

Interesting.. judging by those pictures. It does not look that bad to gain access from the front. Makes sense to get the hoist to it from the front, then drop the subframe. So you are saying that you did or did not have to pull the tranny with the engine? Just not sure if you could get access to the transmission bellhousing bolts with the firewall in the way..

Thanks! I think I have enough tools and space to take on the challenge

 

+1... impressive indeed.

 

Member "gr8ful" on here had a pair of stock turbos for sale in need of a rebuild. You could possibly pick those up for use with the GT2860RS cartridges assuming the housings are fine (and they're still available).

 

I dont remember the name of the trans. shop I talked to when I was inquiring about a new valve body, but the opinion there was that you would need a t/c stall speed change first if you were making that much power. That the transmission itself is extremely strong, and that different friction material could be provided if so desired.

 

Thanks! I see your in New Jersey-

As a testament not to my skills but to the ease of dropping that whole assembly, the things I spent the most time on was removing the front wheel liners, and the windshield washer arms. They were pressed on very tight and using a small two jaw puller to take the place of the Porsche special tool was tough. there is like zero gap between the cowl and the arm.

 

This I need to do, thank you

There is also a guy right around the corner from me that has a pair of Garrett GTX2860r for sale quite cheap. The 04-06 Cayenne has a real steel exh. manifold vs cast iron!!!! It is a top and bottom piece of hydroformed steel welded together. This means I can weld to it to change the flange!!!

Looks like the 4.8 uses a cast iron manifold and the turbo compressor outlets look a lot longer. Still checking into this.

 

TDo4's from the 4.8 seem like just as much work for a stock turbo. I can buy a Gt2680 turbo new for around 1100.

I haven't been able to find a used engine for less than 5k and who knows what I'm getting. Been that route. Warranty doesn't mean crap in that scenario.
My plan with the heads right now is just to replace all the exh. valves and all the springs, guides if needed, and seals.

I still need to find all the clearance specs and service limits for the engine.

I have a 10k page pdf porsche service manual that is still quite good and in depth that I found for twelve dollars online. It covers 03-06. I'd like to offer it to anybody that wants it for free. Only thing is that it is 172mb in a compressed zip file so I'm not sure if I can attach and send or if there is a way I can host it somewhere for free?

 

Well I have the engine off to the machine shop to get the block sleeved. Going with CP pistons, and using the stock crank and rods.

Final verdict is burnt/chipped exhaust valve. Had some piston scuffing on the suspect cylinder, probably due to washout.

Some things I noticed on the CTT 4.5 that may be worth noting.

@ 175k miles or so the bottom end looks great. Very little wear on the crank, rods, and thrust bearings.

One bank of cylinders is offset on the 4.5. Due to that, one bank's cylinders wear more. On my engine the difference was substancial.

My CTT was burning approx. 1 qt every 1100 miles, far from the acceptable limit of 1 per. 600. When I took the heads off, carbon literally flaked off and fell down in the cylinders in piles. When I pulled the pistons the ring lands were full of carbon and the oil control rings were packed with carbon.

Both my primary cats have some plugging and ash deposits, both my turbine housings were cracked radiating from the wastegate to the turbine port.

So right now I am putting together a new engine and will start a new thread with lots of pics and my setup as it go's together.

Thread closed.