eijun

Personally if I ever do it, it will be (likely on a second car): Gregs Stroker + Kuhn's Twin Turbo



Not that the other products out there is bad but they are more stand alone stuff, but if you do both your going have to get the best on both ends... and likely still need extra things added after both of them.

James Bailey

For which you would need to budget for $50,000 and be prepared to spend $100,000. Just mapping the injection and tuning could blow through $10,000 in a heartbeat.

eijun

Yea, I know just the Stroker is already up there buy itself (especially from Greg). That's why I said if I ever go down that route.
I think I will be happy with just a intake refresh/modernizing it, and a good silent but efficent exhaust (which itself will be expensive being it will be custom being I don't like having an exhaust note)

If you calculate it, it will pretty much cost as much as a modern day porsche.

A better idea for that money it might be better do buy a Panorama then modify it into a 2 door and a 2+2 seats then reduce the roof by a few inches towards the rear seats and then switch out the rear hatch to something more 928ish (thinking the BMW X6 has a good idea in looks and functionality, but also willing to keep it straight porsche design)
Speaking of that idea, I am surprised no one here has done it yet.

Rob Edwards

If you think an X6 is good looking, then put the sawzall down and step away from the Panorama. There's no help for an X6 other than euthanizing the poor thing.

ptuomov

[Discussing a twin turbo stroker...]

I have thread elsewhere about my boosted car. There's a youtube link in my sig. I thought I'd share a bit on the economics.

I have certainly spent a lot of money by some standard on the car, but not more than I anticipated and not enough to financially "move the needle" for me. It's been a journey, and I've learned a lot. Will continue to spend more and learn more, willingly.

However, while it isn't cheap to build a twin turbo 928, it doesn't need to be outrageously expensive. If you have a stock '87 S4 in great condition, converting it to the exact same configuration as my car currently, including on the video, would cost about $20k. The turbo kit, upgrade of the kit to bigger turbos and a higher capacity fuel system, eboost2 controller, stainless steel exhaust, and installation would probably hit $20k about right on the head. This is by the $/hp deal of the lifetime for ~2.5x stock power.

Any internal engine modifications obviously make the project much more expensive. You could go from installing a thicker head gasket (like Peter did on his GT), having the pistons dished and bigger cams installed, or changing the whole rotating assembly. Before you do that, I recommend asking yourself what your objective is:

If the objective is to make as much power you can ever use with a 928, just boost the stock engine and buy some tires.

If the objective is to build a turbo ITB stroker for the simple reason "because I can", the only thing that a responsible adult can do in that situation is to build a turbo ITB stroker.

hacker-pschorr

I know people with PO Boxes in other states where their cars are registered.
Could be a problem if you have a neighbor that might rat you out.

Considering Todd's twin turbo in Green Bay is cranking out over 800rwhp with a STOCK five liter, I question the need for such a setup, other than the "wow" factor of saying you have 6+ liters with turbo's.
https://rennlist.com/forums/928-foru...ar-wheels.html
He hasn't reached the "peak" yet for the stock motor either.........

There are actually some advantages of building a lower displacement engine when boosting. If not, Porsche would have went larger with the Panamera turbo, which is a 4.8 liter.

eijun

Personally I would rather buy a Cayenne SUV, but I am only looking at the hatch area, not the entire car as a whole (I never liked BMW front of the car)

I think the X6 rear looks similar to the Panorama just more sedan-ish instead of hatchback-ish. To me the X6 is borderline ok, being all of their SUV are soooo UGLY.


I wont go down that route

Personally I want to make the car as most efficient, and smooth as it possibly can while holding itself against other cars (and without a exhaust note).

James Bailey

Finally great words of wisdom !!!! You do it BECAUSE you want to No one ever said it was reasonable or logical !

inactiveuser1

Good example of bigger cubes and boost is the Corvette ZR1
The smaller the cu in the more boost you will need to make the same horsepower.
Like a retired drag racer Herb McCandless once said:
Only thing that beats cu. inches is cu. feet.
http://mr4speed.com/gallery17.htm
http://mr4speed.com/gallery15.htm
Boosting one of Gregs stroker motors would
be an interesting project.Traction thou is where the
money should be spent also like Todd did some on his car.

TexasDude74

Boosting a stroker would require an almost complete redesign of Kuhns' kit. At a minimum, all of the hot parts would have to be upgraded including the turbos, making room for all those enlarged pieces would be a challenge. I have serious doubts such a setup could be built for under $100k, but it sure would be awesome! If you think you can live with a lousy 700ish RWHP and don't expect endurance racing reliability you just can't beat that twin turbo setup on the bang for the buck factor.