poots

Hi, I'm a new member so I need to make a few posts and stuff before I can send DMs.

I picked up this 2013 P31 C63 from BaT in October and I've been enjoying it as a weekend car for a few months and the mod bug has been making me restless.

So, I took the car over DD Performance Research in Sealy, Texas to get baseline numbers down before I start with modifications.

For context, this is (as far as I know) a stock 2013 P31, the only modification was the resonators were cut out and replaced with straight pipes, and the interior screen has Android Auto / CarPlay added to it.

During setup on the dyno, we also hit the speed limiter at 175mph a few times so I'm fairly sure it also has a stock P31 tune on it as well.

Pulls were done in 4th gear, ~60 degrees ambient. Dyno is a dynojet with eddy current ramp profiles operating in 2wd mode.

Video link here - final results were 442hp / 399lb-ft of torque: https://www.youtube.com/watch?v=nWkfk0Uz0ZA
Dyno chart here - https://pithos.tacocat.org/files/24d...d/2bf36aa0.jpg

Joshinator99

Sounds pretty reasonable to me IMO. 510 BHP with estimated 15% drivetrain loss is 433 WHP, so even though Dynojets are notoriously “happy” dynos, I’d say you’re right where you should be. If someone more experienced with MB wants to chime in on typical drivetrain loss percentages, I’m all ears.

Sea63s

Congrats and welcome to the forum. You’ve got a beautiful car.

It looks like your drivetrain loss with that Dynojet is 8-9% versus claimed P31 numbers. Can’t wait to see which route you go with your mods and what kind of gains you get over your baseline.

Madcow554

is that 442 whp or crank?

Joshinator99

Dynojet is a chassis dyno, so he’s saying 442 WHP.

chrisridebike8

That number seems a little high but it’s a baseline. Don’t worry about what you make. Worry about what you gain.

poots

Yes, wheel horsepower. "Standard" correction factor which reads a bit higher. Here's a picture of the dyno chart. I'll update the main post to include it.

https://pithos.tacocat.org/files/24d...d/2bf36aa0.jpg

skratch77

Car has a tune on it. My stock p31 did 400whp and 442whp with tune on same dyno. Torque is exactly the same also.

poots

What tune did your car have on it? Interesting that we made nearly the exact same power!

skratch77

Oetuning

djr48312

So the 400rwhp was before ( stock p31 tune ) and the 442rwhp was after the tune?

Sea63s

That seems about right. When I dyno’ed my stock P31 coupe, on a dynojet. I’ve got 415 whp and 397 wtq.

roadtalontsi

It's also like basically at sea level and great ambient temps right now, probably one of the few times houston isn't humid a.f.
Numbers seem legit and healthy. Time to have some real fun

Madcow554

My car with tune + headers + 3 inch exhuast made 460whp on a dynojet. Before headers was 440