jaholmes

Eric,
Since you are in Chicago, you could call euroquipe.com in St. Charles. The have done a few. I think they are listed at TPC installers. I always thought the TPC SC's were a little hokey with the 7th injector.

N51

^
Eric,

How many miles on your car? Have you spoken directly with Todd? Mentioned the 80/20 track bias?

TheOtherEric

Yup, and he recommended the no-cat, center-mounted muffler setup for a track car. He wasn't otherwise concerned.


I don't know the answer. I asked if there was anything he could do to change that, and the answer was to use an A/R .48 instead of .63 wheel (turbine?), which would give torque 500rpm sooner, at the expense of high end hp. He didn't really recommend this, though, I think because you'd lose "expandability" down the road.

CornerCarver

This is the beauty of turbos. The expandability. What Todd is referring to is the exhaust housing on the turbo which can be changed down the road. Can he refer you to anyone that runs this setup in your area? Does he have a diagram of the plumbing? You really have my mind thinking on this one! I might be looking to remove the TPC supercharger in the near future

Jenner

I'm sure I don't know the whole story, but I've got to ask. Why not take the selling price of your 1995 993 C2 + $14k that you would spend on an aftermarket super/turbo charger and get a 993TT?

Factory reliability, power and design that can take the abuse at the track. Like you said you are an engineer and given the cost cutting period Porsche was going through when it produced the 993 I don't think they would have put upgraded parts in the turbo engine unless it needed it.

Do you really want to troubleshoot piggyback ECUs, air/water cooler pumps and extra injectors?

While I don't have any personal experience supercharging a 993, I did put a Vortech kit on an 2002 S2000. It ruined the car for me as one thing lead to another. At first it was running lean which lead to a second piggy back controller which didn't work with the first. Then new injectors and another piggy back system (greddy emanage) but that system still couldn't add enough fuel where it needed it and it was adding too much fuel at part and no throttle.

So next a stand alone computer (AEM EMS) was installed replacing the factory and piggy back computers. The bonus was to be that I would make more power with the new programming, injectors and a smaller pulley at the cost of having to tune it from the ground up. This new power meant the stock clutch wasn't up to the task so a stronger clutch and lightweight flywheel went in, but this made the car VERY hard to drive on the street.

In the end it was a PITA to drive on the street, the tuning was taking forever to finish, it spent more time being worked on than being driven, and I had spent a small fortune on it with very small results for my time/money. I finally gave up on it, had everything pulled off the car and put it back to stock and traded it in on a 2003 996 C2.

Reading about all the crap I went through with the S2000 isn't even close to the real thing, but perhaps reading it will help you make your decision one way or another. In the end forced induction from the factory is always better IMHO.

But if you must do one or the other, I would vote for the turbo.

CornerCarver

This makes too much sense and takes the fun out of this rediculous hobby/addiction.

TheOtherEric

Yeah, I knew this one was coming. Sounds great on the surface, but would cost way more than $14k. Say I sell my car for $29k, I need another $20k to buy the 993TT, plus tax/title/transport, plus a TON of my time & money pulling parts out of my car and prepping the new one: suspension, race seats & rollbar, aux oil cooler, data logger & wiring, stereo, steering wheel, buy new wheels, misc. interior mods = $$$$. The real transaction costs + time + added cash costs would be huge.

If my car were bone stock, then yeah, it might make sense to sell it for the TT.

Jenner

I had a feeling that was the case(and thus why I said I don't know the whole story). Makes perfect sense as you have lots of time and money invested into your 993 already.

As I said at the end of my story I vote for turbo. Seems less complicated in terms of ecus, tuning, injectors and intercooling.

Good luck with the route you choose!

FLA997

Eric--

Please forward me the address you'd like me to send the $29,000 to.....;-)

Acropora

There was a guy near Lincoln, NE selling a nicely modded 993tt engine on ebay I was eyeballing for fun. Was gonna have my in-laws check it out. It had like 2K on it s/p a full rebuild including carrillos iirc. If you don't want that, go with Knighton, no question, imho.

TheOtherEric

Thanks everyone for all the comments. Looks like a pair of turbos are in my future.

I'll keep the board updated, but it'll be some weeks before the parts ship to me. If anyone's interested, here's the basic layout of the Protomotive TT conversion. Except mine won't use headers or look as pretty.

Bull

Go get 'em Eric! I look forward to the progress reports, and particularly the "after" reports!

TheOtherEric

Just a little teaser... I'll be getting these parts next week. Here they are mocked up on a test engine. I'm pretty stoked!

David in LA

Eric - Did you wind up getting the Stage 1, or did you get tempted by the Stage 2?

matt777

Can you get away without reducing compression/changing pistons? How about changing out the rod bolts for ARPs? With the engine already out I'm guessing this wouldn't be a substantial cost adder.