SL55/63/65/R230 AMG: 2013 SL63 dyno
Senior Member
Joined: Jul 2003
Posts: 460
Likes: 14
2006 SL65 ///AMG - GONE BUT NOT FORGOTTEN: 2005 E55; 2002 ML55; 2001 CLK55; 1992 BMW 850i; 1991 M5
Nice!
Great numbers, but keep in mind, the 'Dynojet' is a notoriously 'optimistic' dynamometer. The Mustang Dyno will calculate RWP numbers that are much closer to the stock minus 17% figure that is attibutable to driveline drag. Do the reverse calculation after a session on a Mustang and you come up with calculated crank figures that are closer to what the factory claims.
I had my '73 Trans Am on a Dynojet after a motor rebuild and put down 375 to the wheels, which would be about 450 crank hp. I can attest to the fact that the build in that car - which is a very well documented and tested 455 combination - is good for 390 hp on an engine stand. It really should have been in the 325 range at the rear wheels.
Dynos are great for establishing AF ratios at load and for setting numbers as a baseline for future tuning comparison. (On the same Dyno, of course) But no doubt, your car is a beast!
I had my '73 Trans Am on a Dynojet after a motor rebuild and put down 375 to the wheels, which would be about 450 crank hp. I can attest to the fact that the build in that car - which is a very well documented and tested 455 combination - is good for 390 hp on an engine stand. It really should have been in the 325 range at the rear wheels.
Dynos are great for establishing AF ratios at load and for setting numbers as a baseline for future tuning comparison. (On the same Dyno, of course) But no doubt, your car is a beast!
Thread Starter
Super Member
Joined: Oct 2011
Posts: 659
Likes: 1
From: Dallas, TX
SL63
Dynojets can be "optimistic", but this one I believe is pretty accurate. This is the same dyno that my '06 SL65 dynoed at 528 rwhp which is where you would expect one to be given the crank hp. My '12 CLS63 dynoed at 480 on this same dyno. The numbers are in line with the observed trap speeds at the dragstrip too. The SL63 actually being faster than the SL65 due to less weight.
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