heinrich

Correct. ..... we'll see

Benton

[QUOTE=Tony]Whose cars? I want to see pics and results!

Herr-Kuhn

Really, the front mount 928 turbo is no problem. I have two cars made up this way and each is very streetable! No, the conversion isn't easy, but it is all worth it for the stealth power factor as well as the look on peoples faces when you squeeze the trigger.

I still stand by the statement that the Old Goldmember is the stealthiest 928 on the streets today...all the racer-X guys out there have no clue what is residing under that 80s "retro" Golden stealth exterior. They can hear it coming, then they realize it isn't just exhaust work! No wings, spoilers, etc. It even looks nearly stock when you life the lid...that was a design goal of mine...to keep it looking stock....the most difficult part of the whole project. Now if I just had had 1/2 a brain when I picked the car up and got a 5-speed instead of this Auto...man that would be a wicked ride...even the AT is very impressive. The really crazy part is how well those small K-24s work on the Goldmember...I selected them because of the A/T....to build boost faster. This car is a great grocery run car...a back road amusement ride. The car your mother in law fears (oops, forgot I don't have a mother in law anymore I was able to put down 80'+ of solid black line with this car out of 1st gear...no limited slip.

Brenden...let me know...I am getting my manifold Jigs back from Corky Bell this week and I'm looking to make a few sets of manifolds for the 8 valve head cars...the first set will go on my Callaway with a set of 3K K-26 I picked up last year. I'll cut you a deal on a set of them if you want to do the rest of the plumbing yourself. They are made to fit K-24/K26. Don't worry...it won't melt down! I have a fabricator here in Cincinnati that will be making a set for me. The old Callaway manifods hit my steering shaft on hard right corners...thus the reason I want to replace. The Callaway parts are not for sale!

heinrich

John ... depending on price I may be in the market. Just the manifolds.

BC

I'll look forward to hearing from you John.

You know - the new Audi A4 2.0 is a 2.0 turbo with 10.7:1 compression running 12psi over atmo of boost. I'm not sure how to think of that in actual volume, since boost is relative, but my point in bringing it up in this thread is that everyone harps on compression ratio under boost, and here is a factory turbo charged car with 12psi and almost 11:1 compression.

Tony

What valve and igntion timing is he running? Thats how they do it.

BC

I'm sure its all variable valve timing and lift. I'm not even sure how I would find out about that engine technically.

Herr-Kuhn

Yes...it is being done with the proper management...on 928 I think the 8:1 with 10 psig makes for a really good, and safe ride. Heck, I still run mechanical distributor with progressive pressure retard on the boost...it is simple and works really well. I'm sure with a stand alone system the car would be faster...but it is already a rolling pile of $.

Herr-Kuhn

Let me get my jigs up here, get them to the fabricator and I will put together some pricing on the manifolds...that is the one part you don't want to have to make yourself...PITA!!! I'm not out to make a pile of money on 928 parts...but I would like to see more of these cars on the road.

James-man

Selling manifolds sounds like a pretty good plan.

This could get more turbos out there sooner.

James-man

It is hard to imagine a factory car intentionally designing rear mounted turbo - not contest on that.

I don't think anyone would contest the fact that rear-mounted turbos will be less effective as well.

But just how many factory cars have a turbo V8 in the first place?

Then, for those factory cars that have stuffed a V8 in a cramped engine bay, how many will have left ample room to configure add-on turbos. If the factory intended to have turbos they would have afforded room for them.

You guys that have managed to get turbos up and running within the engine bay are way above average on the curve. Rocket Scientists maybe?

Among 4,5,6&8 cylinder cars, the 8 cylinder probably has the least concern over lag due to a nice healthy torque curve. If somebody can get some mid to high RPM boost for a V8 with a quick install, that sounds pretty good to me. Front turbos must be better in terms of efficiency and power capability, but it takes you rocket scientists to pull it off.

I was just struck by the "Factory" reference. Everyone recognizes that there is compromise in these alternative configurations and there is no reason for a factory to make these compromises since they can control design.

On a side note, kudos to the rocket scientists here that have minimized compromise!

tammons

Well after building 3 different setups and going under, on top of, and in the engine bay looking at countless options for hours on end, I just feel there are better options. My last setup was the simplest of the bunch, and my next alternate simple setup was going to be a t04 on the passenger side low. There is a lot of room there. If you really want to hook into the stock manifolds I would try to keep the turbos as close to the engine as possible and maybe mount a small turbos where the Cat would be.

On the extremely more complex side was an idea I had after reading about a quad turbo pantera 1000hp setup. With zero room for headers that might be a good option for a 928, but for now I am driving a 951.

I wouldnt say its rocket science, it just takes a lot of gnashing of teeth, hair pulling and time on your back. Must be nice to have a lift. In my case I had a spare engine out of the car and a complete car in my shop, which made everything a lot easier.

On my second setup I actually tack fabed an entire header setup out of mild steel to make sure it fit, then fabbed it out of SS. It is all very tedious.

Well good luck and post some #'s when you get it built.

Herr-Kuhn

Oh yes....time on my back I know about!

tammons

I bet, and it is miserable trying to snake anything metal through the drivers side. The passenger side is bad enough but the drivers side is impossible. Where are you draining your turbos. Did you tap into the block or oil pan.

Vilhuer

968 was also made in Zuffenhausen.