RStevens63

Speaking of inlets have you seen how convoluted the CLK 63 inlets are? Wonder what they were thinking over at AMG...

Even Money

Well...all I can say is that after my first run, at 386 rwhp, John thought I wasn't getting enough air to the motor because of the intake tubes...so he changed them around, and an extra 20 rwhp, to read what I ran on the dyno several months ago..

1. Maybe there weren't enough fans this time, can't remember what he had last time.
2. I'm not sure how he had them positioned on the first run (I was in the car), maybe they were obstructed somehow??

superlubricity

Always in the stock location in over 100+ dyno pulls on 5 different C63s on the same dyno. There is no need to move them out of this location.

RStevens63

Awesome and agreed! If it's not how you drive/race (inlet tube orientation) I don't really see the point. Good work superlubricity.

superlubricity

That same 20rwhp gain would have come with them in stock location. I mentioned a while back that it takes a few runs before these cars start putting out peak HP. I usually make three WOT runs before letting the car cool down. Those runs are usually on the low side and inconsistent. The next three runs are always at max HP/TQ and are very consistent. Exact scenario happens with avb's car.

RStevens63

Understood, thanks for telling it how it happened. IMO all 63 models could benefit from larger (some models straighter as well) inlet tubes and also larger air-filters. My 07 M6 had what I thought to be enormous filters compared to the E.

Even Money

This Wednesday should finally give us some solid data at the strip!

RStevens63

The track is where it's at!

Hans Delbruck

The driver being the variable then... who's the pro at getting these bad boys down the strip?

hhughes1

Interesting reading regarding this topic


http://www.dinancars.com/bmw/technia...ern-bmw-engine





That's air flow!

RStevens63

Excellent link and info. Just goes to show that 99% of the dyno's out there aren't laying down the same numbers you would see in the real world with real airflow.

RStevens63

It seems once you put some drag radials out back pretty much anyone can launch a 63 thanks to the automatic trans. Now without traction it's anyones guess.

Jycke

Hi,

this may be a tad off topic but what is the difference between the P30 (over here) and P31? Is it the same thing but different codes in different regions?

At least here the P30 contains:
30+ gain in hp
performance suspension
more powerful brakes
red painted brakes (no, it's not brakes but in lack of the correct word, that's what i'm gonna call it)
Alcantara trimmed steering wheel

Is this the same as the P31?

cek

With the exception of "performance suspension" it sounds like it. The P31 in the US has the exact same suspension as the standard car. In 2009 and previous there was an option that provided a stiffer/more aggressive suspension. The 2010-2011 P31 package does NOT include this and I believe it is not even available at all anymore.

The red thingies are "calipers" ;-)

SonnyakaPig

Wow, I didn't know MB may have axed the stiffer springs. I have never felt them, but I've read that they were too stiff.

Powerchip

A forum member has agreed to provide us with a P31 in Socal for dynos and testing.

One of the tests we will do is to install the "normal" non P31 tune into the P31 car

This should help to determine if there is any measurable increase in power as a result of the claimed internal mechanical changes to the engine internals

The plan is to use a dynojet for the tests

SonnyakaPig

That's great news.

Not sure if you saw this, but a members P31 car was running nearly identical numbers to another members Eurocharged car at the track.

cek

This is great news! Thanks to whoever has volunteered this!

Why do you say "claimed"? Does anyone seriously believe MB is lying that they put different internals in the P31 engine?

c32AMG-DTM

Believe it or not, yes... some conspiracy-theorists think that the P31's use of SLS internals is marketing BS from MB/AMG, and that the internals are the same as the other M156's.

I don't count myself among them - it would be a HUGE risk to AMG's reputation if a P31 owner (maybe a performance shop, tuner, inquisitive owner, etc.) opened up their motor and obtained proof that it was a lie all along. I have a hard time believing AMG would take that risk.

avengerboater

Yea, but who would honestly open up a $40k engine to take a peak and see if the internals are really from SLS or not? And if they did open up the engine, how would they know if those parts are not the same as every other m156 without opening up another m156 engine to compare?

I'm not saying I believe it's a lie. I'm just saying the percentage of C63 owners who will go through the process of modding their cars are small, and the percentage of those who would go through the process of modding anything beyond tune/headers/pulleys are even smaller. The only one who I can think of that would readily dissect the M156 engine would be DadsC63 and MHP. But they're not gonna buy a 2011 P31 engine and disassemble it to "see" if there really are forged internals, or not.

c32AMG-DTM

I don't disagree that it's unlikely... but it only takes one.

AMG wouldn't risk the beating their reputation would take by intentionally misleading and overcharging their client base (IMHO). Brands that foolishly do stuff like that take decades to repair their tarnished image. Since they really have nothing to gain by saying "hey, we put uber-ultimate SLS parts in this engine" and everything to lose if they were caught lying - methinks that they wouldn't take the chance.

cyberorth

Or one can just look up part number catalogs.
I'll say this that if I were MB I would call it 'M156.1' or something.

black-clk500

i find it really unlikely that AMG would lie about the internals--for what the parts cost them it's a drop in the bucket for them--however, if an when a P31 motor is in fact disassemebled, even if it's 10-20 years from now, someone will check it out and if AMG lied it will come back to bite them and their products hugely--as others have said, it's not worth the risk.

Also, think of how many people are involved with making these cars, you're telling me they could keep everyone's mouth shut--especially the ones that leave ot get fired

Plus, I think we can all agree that the SLS internals don't really do much in terms of performance for the car anyway--I know it wasn't a huge factor for me to get the P31. It was more a little icing on the cake

khmergod

Cek, forgot to ask, how did you break in your engine. Did you do a hard high rpm break in in gears 1-4, or did you do low rev easy break in? Love your numbers!

cek

I babied it per the instructions for the first 1000 miles. I _might_ have let her rip once or twice :-)