MrPorsche951

excuse me, I am 100% technical.. as always. I suggest you stop badgering me as I am allowed to be here.

A quad turbo!? Thanks Darwin for your education, appreciated as always.

Lorax

Sorry man... this ain't a public sidewalk. You got no unalienable rights here, and you won't be getting your phone call, either.

porshhhh951

You're turbo and engine build pics on your myspace are pretty involved looking. What all did you have done exactly?

reno808

i got 2 right here

ehall

That was AWESOME!

PorscheDude1

Easy as pie. Try doing a search, the dual turbo set up has been covered extensively. I think there is even a DIY with tuning maps for download.

ibkevin

WTF happened here???

blown 944

Just to be correct the Supra is an inline 6 not a V so that really doesn't apply.

It is really for using 2 smaller turbos rather than on big one to reduce lag and still get enough airflow

Randy V

Why the gang-tackle on this guy?

seattle951

There was a 951 enthusiast in Seattle that was fabricating a setup for two small VATN turbochargers for the same reasons Toyota used twin turbos on the Supra. The VATN solution is especially attractive since the turbine geometry changes with exhaust volume. If I remember correctly, he had to use to turbos since large VATNs were not commercially available yet. I believe Porsche now uses a large VATN on their latest 911 turbo.

This was a very interesting project. I will see if I can find his contact information and see how it ended up.

porschefig

....group tackle

https://rennlist.com/forums/944-turbo-and-turbo-s-forum/456812-i-appalogize.html

https://rennlist.com/forums/944-turbo-and-turbo-s-forum/455422-absolute-perfection-buyer-beware.html

Originally Posted by MrPorsche951 at 09-09-2008, 06:16 PM
My z4 3.0si is paid in full for the next year and a half. I did a pre-paid lease. Depending on the condition of the car at the end of my term, I might buy it out over another 2 years. (24 payments)

The 951 sell, not bad figuring I bought the car for 6,000 and paid 700 to get it shipped. Put no cash what so ever in it, beat the living **** out of it and just sold it for almost double. I got shipping half price beacuse the mileage discreprency (60 miles were put on the car)

The car was flawed top to bottom, the only thing good was that the outside was Absolutley Perfect. New Paint and rims...

The P.O.S. wouldn't boost, I'd put my foot to the floor untill 5k RPM, I'd smell burning oil and then downshift for fun. I took it in to a friend who runs a 930-993 911 shop and he said "Oh man, this thing is a wreck."

So I drove it civilized... and sold the Leaky, Smoking, Non Boosting car for double what I paid for it. I remember pouring about an ounce of oil out of the intake when I removed it.


But! The current owner loves the car. he left me an email today saying how much he and his wife like the Porsche. I'm buying a 1998 XJ8L with the money.. 39,000 miles on it, in perfect condition, and a 12 month warrenty... just another winter beater with 300hp. Almost faster than the Z4.

eniac

It would make more sense to delete the AC, put a supercharger in it's place for low end power and install huge massive turbo on the right side of the engine. Biggest issue is the low 6500 rpm. The only good reason to have 2 turbos in a 4 cyl is for them to be sequential...in that 6500 rpm there isn't enough time to spool up 2 in a row. If you car had a 8k or 9k redline then I could see an advantage but I'm sure the next time we see your car on Ebay it will have some super rare 12k rpm twin turbo 4cyl in it.

Darwantae951

You mis-read my post. I said "most" and singled out the Supra because it was not a "V" or "flat" engine. I am familiar with the Supra layout.

eniac

Factory they are a twin turbo, however all of the 1000+ hp street driven Supras I have seen were switched over to a HUGE single turbo.

gstreev

I agree that most twin turbos have 2 banks of cylinders, sometimes a sequential setup is
used to help spoolup where a small turbo is used at low rpm, then a larger one takes over as revs increase. 3rd gen RX7 and Audi 2.7 motors use this setup. They seem to be problematic and
many people switch to a single turbo setup. I doubt this would be worth the time, effort & money on a 951. What are you trying to achieve max HP, better spoolup/driveability? I think the exhaust plumbing
would be crazy. My 300ZX TT was a real hassle to work on for this reason. exhaust, intake, intercooler
pipes everywhere.