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Deman Motorsport 4.25 liter

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Old 12-13-2018, 04:35 PM
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rflavell
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Default Deman Motorsport 4.25 liter
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Old 12-13-2018, 04:56 PM
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BioBanker
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That's the stuff! I wonder how reliable those numbers are.
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Old 12-13-2018, 05:06 PM
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Old 12-13-2018, 05:19 PM
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My dream DE / Track car!!! A 981 GT4 Clubsport with a killer engine........
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Old 12-13-2018, 05:54 PM
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Nice-but I am pretty sure that number is flywheel horsepower NOT wheel horsepower. Big difference...
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Old 12-13-2018, 06:00 PM
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Wow. And I was just getting used to my 4l X51......
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Old 12-13-2018, 06:09 PM
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jmartpr
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Originally Posted by polobai
Nice-but I am pretty sure that number is flywheel horsepower NOT wheel horsepower. Big difference...
Hmmmm...good question. 488 Hp at the wheels would be a monster of a car. Anyway, I'll take those 488 at the crank.
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Old 12-13-2018, 06:10 PM
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James88
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Originally Posted by polobai
Nice-but I am pretty sure that number is flywheel horsepower NOT wheel horsepower. Big difference...
At the end it say 488hp at the wheels.

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Old 12-13-2018, 06:33 PM
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ajw45
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Originally Posted by BioBanker
That's the stuff! I wonder how reliable those numbers are.
Originally Posted by polobai
Nice-but I am pretty sure that number is flywheel horsepower NOT wheel horsepower. Big difference...

Those are RWHP numbers!!! Deman supports a lot of race cars and that's their in-house dyno which they use to test and measure just about everything they put in the race cars.

My car has been on that very dyno many many times. A few data points:

Stock - 358 rwhp on a cold AF day in January 2017
After Headers (no tune) - 372 rwhp a couple weeks later
After 4L X51 - 429 rwhp Summer 2017
After Exhaust Swap - 415 hp just a few weeks ago (gained mid range torque lost top end hp with aftermarket GT4 exhaust)

488 rwhp is a legit MONSTER
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Old 12-13-2018, 06:37 PM
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Originally Posted by polobai
Nice-but I am pretty sure that number is flywheel horsepower NOT wheel horsepower. Big difference...
It is 100% RWHP.
We don’t speculate on crank HP and put that out there. This is the actual to the wheels delivered HP.

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Old 12-13-2018, 06:45 PM
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Originally Posted by Rick DeMan


It is 100% RWHP.
We don’t speculate on crank HP and put that out there. This is the actual to the wheels delivered HP.

In that case, my apologies-very impressive numbers! Not to speculate but that would be well over 550hp at the flywheel!
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Old 12-13-2018, 06:47 PM
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93 or E85 or Race?
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Old 12-13-2018, 07:20 PM
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Originally Posted by polobai
In that case, my apologies-very impressive numbers! Not to speculate but that would be well over 550hp at the flywheel!
I believe the loss percentage numbers from Dyno to Dyno and from tuner to tuner are in the 10-15% range, so I always use 12% in my calculations for an Engine HP number.
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Old 12-13-2018, 07:21 PM
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Originally Posted by Ksdaoski
93 or E85 or Race?
This was built on a GT4 Clubsport, so it was using 98 Sunoco race fuel
Last edited by Rick DeMan; 12-13-2018 at 08:33 PM.
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Old 12-13-2018, 08:44 PM
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Originally Posted by James88
At the end it say 488hp at the wheels.
True, but it also says it's out of a six-and-a-half liter V12 at 11,000rpm!
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