LJMartin

Just read and article that said road and track reports that the current M5 has been rated by independent dyno tests that rated it at 620 horses.

Geno51

They said the same thing about the e63s

kponti

Why all these M5 threads? It is a great car, better than the E63 in a lot of aspects worse than the E63 in a lot of other aspects

PeterUbers

Interesting

This magazine thought otherwise in 2014

Wait till the x drive m5 comes out ...

TMC M5

Not to stoke another E63 S vs M5 debate...but most M5 dynos on Dynojets were in the 520-540 range. The E63 S dyno in the same range on Dynojets. When you factor that the E63 S has an inherently less efficient drivetrain (more parasitic loss), it must make more crank HP than the M5. So even if the M5 is underrated (which it is), the E63 S is even more underrated.

efiftyfizzle

Sick of people and their dyno claims

TMC M5

The thing is that people have to look at the type of dyno and understand the context of the numbers. You can't directly compare results from a Mustang dyno to a Dynojet. Or even a Dynapack dyno to anything else. Even how the dynos are calibrated (especially if using STD correction on a Dynojet) can make it difficult to compare the same brand of dyno. They are best used to compare before and after mods but the conditions can still be manipulated if the dyno operator wants to skew things intentionally.

efiftyfizzle

Exactly, but people don't understand that and then make threads here. Dyno numbers are not standardized and I'm not sure if anything is really considering the performance of a car relies on many factors. Only way to compare is same time, same conditions, etc.... If you don't have those then don't bother making comparisons.

TMC M5

Not to get too far off topic...but as I mentioned in another thread, I don't bother doing dynos anymore. A great dyno run may not translate to a strong running car out in the real world. There may be torque limiters in the TCU preventing the car from shifting properly/quickly, so although it might put down huge power in a single gear, it could be at the detriment of actually producing quicker overall times. I found this on a couple of my cars. I could see the delays on my vbox graphs and went back to the tuners to help. You probably wouldn't see that on your typical dyno.

PeterUbers

Very interesting

efiftyfizzle

Yup, especially on this platform. The upgraded turbo cars are not running much better times (1/4 mile) than the bolt on cars but the dynos would lead you to believe otherwise.

PeterUbers

Yeah it's interesting some guys will have a renntech tune and stock 1/4 about 11.6-11.8 but with the tune that gives them 100/150 extra hp/tq ... Will run 11.3-11.6

...but the roll acceleration is more impressive (lol, I know ... Here we go again) ... With very impressive 60-130mph improvements... But the tcu doesn't limit the engine at those speeds -- right?

otakki

So is the new M5 going to again channel engine/exhaust sound out of their speakers?

efiftyfizzle

It's not about the speed, it's the gear. The torque limitations are in the lower gears (definitely 1st and maybe 2nd too) and that's why these cars can't cut good 60' times.

PeterUbers

Why couldn't they dial down the tcu a bit to get better "out of the hole" performance?

Too much on the stock drivetrain?

efiftyfizzle

The tcu is locked/encrypted. They can't touch it.

vdubpower

everyone knew this when people were dyno ing them in 2013.....its still a pig and drives weird....feels like a 7 series and has fake *** exhaust noise

on eas youtube page they have a bunch of dyno runs of what it was putting out

gaspam

yup, i used to get the 3rd gear shift pause in my e55 once i started putting down bigger power... it was the tcu but was able to get the tcu tuned which fixed it

PeterUbers

I guess what I'm saying is why wouldn't benz dial the TCU down for more aggressive performance?

gaspam

they probably did... to the point to where they thought it was aggressive enough while still not having any tranny replacement within warranty period

efiftyfizzle

Exactly... They probably didn't want to go through what Nissan did with the GTR when people were destroying their transmissions with launch control.

LJMartin

Sorry guy's didn't mean to start a war. I just thought the article was interesting. I came from a N/A M5. Loved the sound of the V10. When modified the MB exhaust sounds good too but in a different way. The 1-2 shift on the M5 was brutal. The first time I did a full throttle shift I thought I had dumped the rear end in the middle of the road. The Benz seems to rev faster than the M5 as I still find it hard to keep it off the rev limiter. Could be my reflexes are slowing down. All and all I find the Benz to be a much better daily driver than the M5. That could be because I'm getting older too.

Zod

omg I have this as well, but not every time. Who did your TCU?

gaspam

jerry at eurocharged

PeterUbers

That's it.... I'm getting an M5