So NOW I know what the C63 AMG is REALLY capable of...

[sflgator]

Finally got back to RENNtech today to have them dyno my RENNtech stage 2 C63 AMG. They were even nice enough to flash it back to stock for baseline dyno numbers and then reflash it again to the stage 2 ecu flash. The temp was ~ 92 degrees F / ~ 68% R.H. and they had 1 large fan blowing toward the engine. Anyway, here are the numbers ... C63 AMG Stock baseline: 366.82WHP / 353.83 lb.-ft. RWTQ C63 AMG RENNtech stage 2 ecu flash: 411.82WHP (+45WHP) / 368.29 lb.-ft. RWTQ (+14.46 lb.-ft. RWTQ) Assuming 20% drivetrain loss, then it would mean: C63 AMG Stock baseline: 459HP / 442 lb.-ft. RWTQ (fairly close to MB's advertised 451HP / 443 lb.-ft. TQ ) C63 AMG RENNtech stage 2 ecu flash: 515HP / 460 lb.-ft. RWTQ!!!!! Although the 'after ecu flash' TQ seems a bit low, the HP # is exactly what I had expected; I'm very happy with the RENNtech ecu flash tune...great job, RENNtech!!!

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[bushburninc63]

great stuff, now go get us some 1/4 mile times so we can see what it does.

[Mr. Happy]

Good numbers. You were in 5th great right?

[sflgator]

Originally Posted by Mr. Happy

Good numbers. You were in 5th great right?

No, 4th gear pulls I believe. I'm fairly certain these dynos are done and should be done in 4th gear on these cars.

[desmo996]

Originally Posted by sflgator

Finally got back to RENNtech today to have them dyno my RENNtech stage 2 C63 AMG. They were even nice enough to flash it back to stock for baseline dyno numbers and then reflash it again to the stage 2 ecu flash. The temp was ~ 92 degrees F / ~ 68% R.H. and they had 1 large fan blowing toward the engine. Anyway, here are the numbers ...

C63 AMG Stock baseline: 366.82WHP / 353.83 lb.-ft. RWTQ

C63 AMG RENNtech stage 2 ecu flash: 411.82WHP (+45WHP) / 368.29 lb.-ft. RWTQ (+14.46 lb.-ft. RWTQ)

Assuming 20% drivetrain loss, then it would mean:

C63 AMG Stock baseline: 459HP / 442 lb.-ft. RWTQ (fairly close to MB's advertised 451HP / 443 lb.-ft. TQ )

C63 AMG RENNtech stage 2 ecu flash: 515HP / 460 lb.-ft. RWTQ!!!!!
Although the 'after ecu flash' TQ seems a bit low, the HP # is exactly what I had expected; I'm very happy with the RENNtech ecu flash tune...great job, RENNtech!!!

Just curious as to what was RENNtech's explanation regarding the torque number?

You managed to get up to 460 lb.ft. while their claims are 480 lb.ft. following the tune. 20 lb.ft. of torque less is kind of a large discrepancy and does not match their published statement. Did you ask them about this and what did they say?

There site states:

RENNTECH ECU upgrade 2 $3495

511 HP @ 6800 RPM; 480 LB-FT @ 5200 RPM

[Veho]

Originally Posted by desmo996

Just curious as to what was RENNtech's explanation regarding the torque number?

You managed to get up to 460 lb.ft. while their claims are 480 lb.ft. following the tune. 20 lb.ft. of torque less is kind of a large discrepancy and does not match their published statement. Did you ask them about this and what did they say?

There site states:

RENNTECH ECU upgrade 2 $3495

511 HP @ 6800 RPM; 480 LB-FT @ 5200 RPM

Why is renntech so expensive? My shop had it at 3500$ as well but dont you get Kleeman K1 for around 1500$ Is the result the same (around 510hp) for K1 and Renntech upgr.2?

[sflgator]

Originally Posted by desmo996

Just curious as to what was RENNtech's explanation regarding the torque number?

You managed to get up to 460 lb.ft. while their claims are 480 lb.ft. following the tune. 20 lb.ft. of torque less is kind of a large discrepancy and does not match their published statement. Did you ask them about this and what did they say?

There site states:

RENNTECH ECU upgrade 2 $3495

511 HP @ 6800 RPM; 480 LB-FT @ 5200 RPM

Although I was a bit disappointed about the slightly lower TQ #, I figured the fact that it was ~ 92 degrees F / 65% RH (and b/c they only had 1 large fan blowing on the engine) may have had an impact on the numbers. I suspect on a cooler, drier day, the numbers would be slightly higher (maybe good for another +5 lb-ft RWTQ???), including the TQ. In addition, it appears ppl w/ the Kleemann K1 ecu flash are also getting similar increases in TQ; I believe one Forum member recently posted about his Kleemann K1 and now K2 packages and initially saw an increase of +19 lb-ft RWTQ with his K1 flash...this is only slightly more than my +14.46 lb-ft RWTQ with my RENNtech ecu flash.

It appears that with just an ecu flash, there's a good increase in HP (I saw +45WHP / ~ 515BHP), but a smaller increase in TQ. As we know, most if not all of these ecu flashes (RENNtech, Kleemann, etc.) are flashing the C63's "factory detuned" engine to bring it back up to the specs of the other (6.2L) 63 AMG engines...and if you notice, the other 63 AMGs produce >500HP but <500 lb-ft TQ, so I'd say we're "right there."