Z

928worldwide

I would sacrifice some motors if the shoe fit..... - And I have a few ideas of who could pull it off too- and they're your buddies Kevin. Do you really see it making 1000 hp on two turbos? All the math wizards will probably say it isn't possible. What say you math wizards?

Kevin Michael

I say yes. John Kuhn who is one heck of a fabricator has reached well into the 6's on twins. And that guy is VERY conservative with his boost levels.I say I need to design and build a twin set-up, Leave the internals stock with the exception of the cometics, run 25psi through it with a very careful tune, and see what breaks/blows or GRENADES. Then tune down on the next one till it holds together. I think it would be just fine, again, with a very careful tune. In fact I have run 17 psi on my 32V for testing, but am back to 13psi now.

axis of evil

Hey, you guys are OK, (I expected near instant excommunication for a blasphemy on that sort of level I've always thought these cars to be a great starting point for a hotrod)
That photo with dimensions says it all, apart from being brilliantly designed, light weight, and a total beast of an engine, it fits!
Also, rebuilds/parts prices for 928's in this part of the world are astronomical,Toyota engine will make more power than a GTS, at a fraction of the price.
Next installment of shock horror, the transaxle has got to go, tunnel enlargement, and a 5 speed auto installed at the front end. The 1UZ-FE with auto attached weighs in about 10Kg's (about 20 pounds) lighter than the 16 valve (engine only)I have just removed.
This will upset the balance, but only marginally.
Updated/edit on original post, Toyota V8 has 6 bolt mains (not 4)
Supercharging (I don't think nessesary to make 500 horses)is much easier than twin turbo's, particually with available space in a 928 -but don't those twins look magic!
If I go down that route, bolt on supercharger kits available from Australian company that builds 1UZ-FE powered Mazda Miata's
http://www.bulletcars.com/
Italian content in the axis of evil? maybe a pizza box in the back seat.
Will post progress.

Kevin Michael

I want that toy engine-with that twin setup. Where do I send the money?

90 S-4

This might be a alternative too, you could mount it up front or do some creative
machining and turn it into a trans-axle

Six-Speed Automatic Transmission and Paddle Shifter for Your Hot Rod, Muscle Car or Truck
February 12, 2009


TCI has developed the world’s first aftermarket 6-speed automatic transmission. Utilizing the a GM 4L80E, TCI has created an amazing piece of engineering that's capable of handling 850 hp!

The TCI 6-X Six Speed Automatic Transmission gives you six forward gears (3.08, 2.34, 1.60, 1.30, 1.00, 0.75) for quicker acceleration and increased fuel economy at cruising speeds. This versatile transmission fits Chevy Small Block, Big Block and LS series engines and features a compact design allowing it to work in a variety of vehicle applications including pro touring, street or race vehicles. When used with a TCI Transmission Control Unit and TCI Paddle Shifter, you get the most functional and modern drivetrain combination on the market for your vehicle.



Package part number includes TCI 6-X Six Speed Transmission, Torque Converter, Transmission Control Unit, Paddle Shifter, Wiring Harness, Transmission Cooler and Dipstick.
6-X Six Speed Automatic Transmission Package - 271600P
6-X Six Speed Automatic Transmission - 271600
Transmission Control Unit - 377500
Paddle Shifter (see below) - 301442
GM 4L60E/4L80E Wiring Harness - 377502

Paddle Shifters For TCI Transmission Control Unit
How often have you wished that your car had options similar to those found on high dollar g-machines and touring cars? Now it can with the new TCI Paddle Shifter.



Designed to work with any automatic 4, 5 or 6-speed transmission controlled by the revolutionary TCI Transmission Control Unit, this shifter features distinctive show car styling and shifting performance that’s perfect for track days or highway cruising.

The TCI Paddle Shifter communicates to the Transmission Control Unit through a wireless CAN signal that cannot be affected by signal interference or disruption. The steering wheel mounted unit operates by slim, 1/2-inch thick paddle shifters, which instantly instruct the transmission as to your gear of choice without hesitation or delay.



This shifter fits all 5 & 6-bolt aftermarket steering wheels and ships complete with several spacers of varying width, allowing you to adjust the steering wheel location to your personal preference. Power for the TCI Paddle Shifter system comes from the horn button relay rather than from batteries, which require replacement and can result in a low power signal.

Paddle Shifter for TCI Transmission Control Unit (w/o display) - 301441
Paddle Shifter for TCI Transmission Control Unit (w/ display) - 301442

Jon B.

Kevin,

I'm curious what power you made on 17psi? Or were they tuning runs? I very much want to run some boost on my next 928. I would have already been running something if I still had my car, options then were VERY limited for '85-86 cars though. I think Andy's kit was the only thing going then for my car and Mark's old FAST kit.

I wasn't trying to pick a fight earlier, hope you weren't getting that idea. I love the 928, there are always two differing opinions though I guess. Since i'm in a Corvette now, I guess I seem to be "that" guy when I see the threads. Hopefully people around here don't get the wrong impression.

928worldwide

Kevin,
Would it need to be re-sealed and re-ringed and bearings and all.....??? Wouldn't be fair to test on something worn would it.....Also lowering compression first- isn't that a good idea if shooting for 25 psi!? Man that would be awesome!

Hilton

Go for it!

These links might help you avoid some pitfalls - pretty sure Greg Gray will chime up if he reads this thread - as he has more knowledge of the car (it belongs to someone he knows). Or make your own thread for it

Discussion:
https://rennlist.com/forums/928-foru...the-928-a.html

Pics:
https://rennlist.com/forums/928-foru...8-finally.html

Magazine Article:
https://rennlist.com/forums/928-foru...-gemballa.html

Z

www.ttcperformance.com

Quote from the builder:
"A stock 1uz vvt-I won't be able to handle 500rwhp. The rods will fold over before that, and if not the pistons will in their place."

The one pictured is a completely built engine, with different rods, pistons, cams, custom intake, modified heads, etc. The guy previously had a 1,000+hp Supra. He didn't like all the turbo lag and lack of bottom end for a street car, so went with this V-8 setup. Bigger turbos would give more high horsepower potential, but he didn't want that because it would cost in terms of the low end throttle response and drivability that he wanted.

So far it's only been run at 8psi of boost, and made 381rwhp. In comparison, a stock S4 with a Murf stage-1 kit on it makes around 400rwhp at about that same boost level. If you're planning to go to much, much higher boost and power levels, something like that Toyota type of setup might make more sense. I don't know what boost and power level he's planning to go to with that setup in the Supra, but I'm guessing that the boost will get turned up quite a bit.

Todd's working on a twin turbo setup on his S4 that I'm sure some people will find interesting. That will be using his S4 engine with all stock 928 parts except for the 951 pistons that he has in there. Don't expect to see the turbos right there in a very conspicuous spot, like you do in the Toyota pictures though. As far as that goes, don't expect to see too much that isn't basically stock looking on the outside of the car, or with the hood open either. In case you're wondering, it's nothing like a mid or rear mounted turbo setup.

Personally, if I were putting in a different transmission I'd still be trying to keep it in the rear of the car, even if it meant modifying the floor of the car back there to do it.

Kevin Michael

Jon it was for tuning purposes but I did make a short ride in it to bring up 17psi in 2nd. Heart was in my stomach when I hit the 17 and the fuels were jumping around hi 13's and low 14's! Got out of it real quick! It was a gradual roll on so there was only a little tire slip. But I'll tell you it was scary. People use the term "violent acceleration" to lightly but in this case it would be a truthful description. Felt like 700 wheel, but who knows. I am working on getting up there again but safely this time.
Mase, A real world test on a real world engine. Mine has 140k on it. The cometics I mentioned earlier would drop the C/R . If only Kuhn were around for advice.

86'928S MeteorGrey

I have mixed feelings about swapping out the 928 engine. I had the 944 with a LT1 or LS1 bug bite for quite a while. I even had a car ready for the build that I sold a couple of years ago. I got turned off to the idea after reading issues with the brake booster and getting enough brake power to ballance the speed capable in such a car. Just a couple of months ago, when faced with the TBF, I asked Greg Brown what he thought about putting a LSX motor in my 928. You can guess what he said..."Don't do it" But one thing he brought up was that is often ignored is passing smog. Here in Califunny, it is tough to do with engine swapped vehicles. I heeded his advice.

Now to the people enamored with putting a different engine make in the 928..., if the 928 is so loved for it's body handling, and "feel", I understand. But if people are out there trying to make more HP, at what point does the question be moot?

If you've got a nice, 21st century engineered engine in your 928 making 700HP, who cares what motor it is? It's really not going to feel any different than spending your fortune on a 928 monster build. How much faster will the 928 engine really rev? How much higher? The only difference will be cost of build, maintainence and repair. Like said before in this thread, 928 parts are only going to go up in price as time goes by. SBC engines are plentiful, have tons of parts in the aftermarket, and can be had at any pepboys or autozone. Purists will argue, and racers will do whatever it takes to win, but in the long run, If it means a 928 on the streets still, I'm for it.

I chose the path of building my 928 engine. I'm not looking to time any quarter mile runs, or even out run the ricer thats trying to impress his girlfriend. I just want a good running 928 that won't leave me stranded in the middle of BFE... My first 928 was a 79' auto. I swore I'd never own an automatic Porsche. That car converted me. It was fast, had impecable handling, and never left me wanting more power. I never really felt limited by the auto weather I was accelerating in a straight line, or carving up a twisty canyon road. That was due to the excellent rear axle of the 928, proper weight ballence, and perfect cockpit design. (I might get flamed here) So, to the people that want to put a LSX engine in their shark, I say go for it. Power is power however you get it. I don't think you should tear up good running beautiful machines, but for a dead shark, bring it back instead of parting it out... It's the classic styling and superb handling that has always made Porsche great. The 911's that brought Porsche to early fame did so due to handling and styling, not HP. Those early air cooled tubs were not bullets to be sure.

That's my 2 cents.

axis of evil

Thanks , I must admit I did not search, as i was not aware it had been tried, (and in my own home town!!)

928worldwide

Kev see mail