Had my C63 AMG mapped to "507" but dyno says its 479

[Captain Carling]

I had a map uploaded onto my car that was supposed to be for 507bhp (mine is the 457 standard) and today I had a power run done and its shown up as 479atf 389atw.
What do you guys normally see?

 

[MancMike]

Isn't that at the flywheel, and your dyno is at the wheels?

 

[developer]

23% is a big adjustment from wheels to flywheel - where did you take it?

 

[V8AMG]

Had mine eurocharged last year and dyno run showed 424 stock and 474 mapped. Lots of variables when it comes to dynos. Question is does it pull any better?

 

[Doodle]

Lies, damn lies and statistics. Welcome to the murky world of dyno printouts.

 

[ecain63]

I think the dyno is wrong!

The adjustments are way out. Who did it?

 

[Cyclone1]

Just post the graph up if you have so we can have a look, this may help answer your question. Did you ever do a run on this same Dyno before your car had the map done?

Jules

 

[Captain Carling]

Here you go

 

[Captain Carling]

These might be better pics

 

[ecain63]

Id try a different dyno. A reputed one.

 

[Cyclone1]

Just checked out More BHP, the last C63 they mapped started as 433bhp std and then ended up with 477bhp once mapped. If you ignore the actual headline numbers but look at the gain then it's 44bhp. On another Dyno the start point may be 457bhp so the remapped figure may be 501bhp. Based on this then your figures on this particular Dyno are in line with a remapped C63.

Jules

 

[ExMercTech]

What was the map uploaded.

 

[daveenty]

Is it just me? I can't seem to make head nor tail of those graphs.

Torque & power should be meeting at 5,252rpm (explanation why HERE) yet, if I'm reading these graphs correctly, they are meeting around 4,000?

Another thing is, as stated by Developer John above, 23% seems one large amount to be losing through the transmission. The general rule of thumb is 18% on rear wheel drive cars, though even this is a very rough guide and purely a generalisation, although it does give you a benchmark figure.

How does the car drive after the map? To me this is the crucial bit, not some figures on a piece of paper. I recently had mine re-mapped (yes, again) and the figures both before and after were practically identical, though the character of the car has completely changed in that it's so much smoother and puts the power down all the way through the rev range now as opposed from it being like an on/off switch before.

 

[st13phil]

Dave - the curves don't cross where you'd expect because the torque scale is in Nm not ft.lb

 

[daveenty]

Knew I'd miss the bleedin' obvious somewhere Phil.

Cheers.

ETA: I'm still puzzled by such a massive power loss though, that's enough to boil the ATF.

 

[Captain Carling]

I think it was a Renntech map

 

[edc]

Forget what the figure shows now. The only way to show an improvement is to dyno before and after, ideally on the same dyno. Who's to say what the start point was for your car?