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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. 
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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01-11-2008, 02:59 PM
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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.
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1984 928's w/ 5 speed Smoked Quartz Metalic 1982 928's Turbo w/ 5 Speed Platinum Metalic 1978 Euro Widebody w/ 5 speed Guards Red |
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01-11-2008, 04:12 PM
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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.
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The beast 1984 928s twin turbo 5speed LSD/ 508.6RWHP 495RW ft lbs 12.5 psig manifold pressure, MS2 and EDIS-8 nikasil block JE 2618 pistons (TripleT). 2001 AUDI A6 4.2 chip 320 hp. 2002 CHEV Tahoe 4wd. 1971 sonett race car GT4 National Champion now GTL class car sold. The words of a Ford GT man. ( Damit i need to get some turbos) Last edited by sonett3; 01-11-2008 at 06:39 PM.. |
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01-11-2008, 06:35 PM
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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.
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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01-11-2008, 06:58 PM
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Regardless, it would tear the fiberglass shell off of ANY Sonett III.
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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01-11-2008, 06:59 PM
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John
which engine does this one have....USA..or the Euro LH motor? Or something custom to lower the CR?
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Brian 1984 "Estate" racer 1988 928S4 Guards red over Champagne Leather (sold) Co founder of "Stockton Sharks Society" |
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01-11-2008, 08:36 PM
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Quote:
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.
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1984 928's w/ 5 speed Smoked Quartz Metalic 1982 928's Turbo w/ 5 Speed Platinum Metalic 1978 Euro Widebody w/ 5 speed Guards Red |
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01-11-2008, 09:01 PM
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It's truly a hodge-podge of parts we pulled together, but the basis was an M28.12.
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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01-12-2008, 02:06 PM
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impressive numbers
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02 996TT Stick Modded AKA Tubsey 08 Cayman S 6spd 49k Black/Terra-cotta 04 Gallardo Gated 6spd 19k Arctic Grigo/Nero Blue 14 BMW M5 6spd Stick 06 Cayenne S 🌝 miles 1982 928 S 5spd :-) |
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01-13-2008, 09:47 PM
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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.
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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01-14-2008, 05:29 PM
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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. |
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01-16-2008, 06:36 AM
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Thanks Twinscrew928 have you gotten your engine put back togther yet.
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The beast 1984 928s twin turbo 5speed LSD/ 508.6RWHP 495RW ft lbs 12.5 psig manifold pressure, MS2 and EDIS-8 nikasil block JE 2618 pistons (TripleT). 2001 AUDI A6 4.2 chip 320 hp. 2002 CHEV Tahoe 4wd. 1971 sonett race car GT4 National Champion now GTL class car sold. The words of a Ford GT man. ( Damit i need to get some turbos) |
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01-16-2008, 03:20 PM
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Quote:
Good job putting it back together. There are not many historic 928's out there. Save the OB!! 
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01-17-2008, 05:25 PM
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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.
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The beast 1984 928s twin turbo 5speed LSD/ 508.6RWHP 495RW ft lbs 12.5 psig manifold pressure, MS2 and EDIS-8 nikasil block JE 2618 pistons (TripleT). 2001 AUDI A6 4.2 chip 320 hp. 2002 CHEV Tahoe 4wd. 1971 sonett race car GT4 National Champion now GTL class car sold. The words of a Ford GT man. ( Damit i need to get some turbos) |
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01-17-2008, 07:02 PM
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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.
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. |
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01-19-2008, 12:08 PM
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This car is getting new BB turbo this year .
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The beast 1984 928s twin turbo 5speed LSD/ 508.6RWHP 495RW ft lbs 12.5 psig manifold pressure, MS2 and EDIS-8 nikasil block JE 2618 pistons (TripleT). 2001 AUDI A6 4.2 chip 320 hp. 2002 CHEV Tahoe 4wd. 1971 sonett race car GT4 National Champion now GTL class car sold. The words of a Ford GT man. ( Damit i need to get some turbos) |
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01-20-2008, 06:50 AM
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Quote:
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01-22-2008, 07:53 AM
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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.
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Kuhn Performance Technologies, LLC Big Gun: 1988 928S4 Twin Turbo, 5-SPD/LSD 572 RWHP, 579 RW ft-lbs, 12 psig manifold pressure. Stock Internals, 93 octane. Little Gun: 1981 928 Competition Package Twin Turbo, 375 RWHP, 415 RW ft-lbs, 10psig manifold pressure. Nikasil Block, JE2618 Pistons, 93 octane. Last edited by Herr-Kuhn; 01-22-2008 at 03:55 PM.. |
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01-22-2008, 03:51 PM
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Heavy Metal Relocator
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Quote:
--Russ
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Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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01-26-2008, 09:10 AM
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