Twin Turbo Triple-T Dyno Results
 

The 4.7 liter Triple-T, went back onto the rollers today. Some changes were made including larger P-20 housings in the IHI turbos and installation of the 1979 camshafts.

The car made a very impressive 450 RW ft-lbs and 445 RWHP on just a tick over 8 psig of pressure. I believe this is a 4.7 liter record. Given the old Callaway layout I'm very impressed with these numbers. There is little doubt this car can make well in excess of 500 RWHP with better turbos. A pair of GT2871s may be in order, or maybe the GT28RS?

Not at all shabby for a car that was passed over for DOA before it was gone through 18 months ago.

PLEASE...Spare me the BS of having to "justify" my dyno numbers on this car...they are what they are and represent the true potential of the exhaust driven compressor. End of discussion.


http://forums.pelicanparts.com/uploa...1200092027.jpg

Congrats to the Kuhn brothers.

Why only 8psi ? By looking at that AFR graph, it looks like theres room for more improvement.

Great job guys.

This car In 1st,2nd and 3rd is just very easy to get sideway's.I got on the highway this morning and you have to watch how much you lay into the pedal . I had It sideway's in 3rd getting on the highway.

I'm not sure you will have to ask mark...I think he is just going to keep it at around 10 so he can have enough fuel to feed it. I know they had to add some fuel on the dyno because it was still lean upstairs.

Regardless, it would tear the fiberglass shell off of ANY Sonett III.

John
which engine does this one have....USA..or the Euro LH motor? Or something custom to lower the CR?

Well, since I see you are logged on and both of them are logged off, I will try to answer your question.

4.7 L lower end that started life as a Euro but now has lower compression forged pistons, Nikasil coated block, Euro S heads and spider, US throttle body, 78 - 79 cams, MAF conversion, IHI turbo's and Callaway turbo manifolds.

If you saw the before pictures of this car you would be amazed. It was a wreck but now has a fresh engine and paint job. Its quickly becoming a very nice car.

It's truly a hodge-podge of parts we pulled together, but the basis was an M28.12.

impressive numbers :cool:

As much as I like the Triple-T I wish he had left it in Wisconsin and gone in on an S4. The previous owner of that car was a scheister at best and left him with a car that didn't have a decent engine (one piston was actually in upside down and the heads were spewing oil into the exhaust ports), a ratted out set of rear 1/4s and a sun baked interior. The car had the wastegates disconnected so he could run the most boost possible, bla, bla, bla...it was a real train wreck. How you take a limited production car like that and completely destroy it is beyond me.

I've got at least 300 hours of labor into that machine.

Nice smooth graph. Good to see SAE correction factor too. Looks like there's still some minor work to be done on the AFR, but I'm sure that's a nice FAST car regardless.

With the lowered compression, you should be able to turn the boost WAY up.

Thanks Twinscrew928 have you gotten your engine put back togther yet.

You are being WAY too nice on that guy. A few people I know went to look at the car. No matter how good / bad the car was, there as no way they were going to deal with him. IIRC my friend said: "That guy is everything I never want to be". Damn shame a car like this ended up in hands like that.

Good job putting it back together. There are not many historic 928's out there.

Save the OB!! http://forums.pelicanparts.com/support/smileys/wat1.gif

Thanks Hacker-pschorr The car is not done as of yet It still has a long way to go. The guy that I got It from said that he would like to drive it agian Ya right. He had put just 20000.00 mile on the car. and it looked like it had 300,000 mile on it. I had to put two rear quarters on, New windsheild ect.ect.ect.

I think we will eventually put some new turbos on this car. One of the old IHIs burned out...they were just not good turbos, even when new. Even the 3K line is too old school anymore for a modern build. I always thought the BB units were over-rated, but what they say about them is very true and it's more than just the ball-bearings...thinks like the wheel and housing designs allow them to be very small yet flow lots of gas. So the result is something the size of a K-26 flows like 30-40% more...I'm anxious to try these on the 16V sometime.

Hacker...I believe we had named that guy "Wisconsin Destroyer". The original sleeved Callaway motor is in the business workshop along with two sets of heads (16V and 32V). The sleeve job held up well on this one and it even looks like the pistons were ceramic coated. One other thing that was done on the engine at some time was a full port/polish on the heads...nice work, but since I had a full M28.12 just sitting here we just rebuilt it and slapped it it. Contrary to popular belief that guy never rebuilt the engine, it was done by Sewickly Porsche in Pittsburgh. How one misses and puts a piston in upside-down is beyond me, but I've seen this on 944s a lot.

Unfortunately I've been down and out the last week and a half with strep...this really sucks.

This car is getting new BB turbo this year .

http://forums.pelicanparts.com/support/smileys/lol2.gif
Maybe he read about the old hot rod trick of installing pistons reversed to increase torque (it does work)....except he kind of missed the part where you have to install all of them that way!!!
Lots of crap going around, hot salt water gargle!!!

The strange part is a 928 or a 944 engine will run with the pistons out 180 degrees...so why have the valve cuts as they are then?

I blew through a lot of salt water...I could have sworn I had 4 golf balls in my head...two in the throat, two under my jaw and then 4 marbles in my neck. The human head/neck has over 300 lymph nodes and it's a good thing. One guy said there is a new strep that is very tough to get rid of that is running around the hospitals. I can't remember the last time something put me down this hard.

non-interference comes to mind.......but don't try flipping the pistons with the Euro or Devek cams.

--Russ