PetroC63

The same thing happened to me on Saturday at MIR, there was a small hiccup in the 2-3 shift on one run. I hot lapped and all shifts were perfect.

Not sure what to make of it.

xtyper

Yep, I'm gonna be there, and I can't wait!!! I'd love to video a run of our cars so people can see how the Weistec Stage 3 package demolishes a Stage 2 C63 car.

As for tires, I just put on a new set of Nitto 555Rs for the event to ensure I get no wheelspin punching it at the start of the roll-ons. Running stock tires up front and stock rims all around. The event is gonna be epic!

Looking forward to meeting you Jim.

jrcart

...ummmmm you're gonna get wheelspin. The airstrip is not a race prepped surface, no VHT, all you are going to have to rely on for traction is the other rubber laid down by other cars. It's a 50mph rolling start, if I punch it at 50mph I lay two dark patches well beyond 100mph so it's going to take a few runs to get a feel for the race surface and rolling on the throttle.

I would be happy to line up with you for a cool vid. I have a couple GoPros and we will have a VBox with us as well. My goal is to break the 200mph mark. in doing some research on other rolling half mile events and the weight of my car and the HP I am making I think the car should be good for at least 200mph. Obviously there are some other variables that are out of our control such as wind and DA that will come into effect. My car was doing 136mph in a standing 1/4 mile do a 50mph roll-on 1/2 mile is going to be a ton of fun.

Merc63

I've had this happen on the street when I punch it sometimes from 1-2. Feels like I hit the rev limiter. Car stops then takes off again, almost gives me whiplash.

Does this effect the MCT guys? I'd say the TCU isn't perfectly able to adapt to the power increase...

RNS-11Z

yep has happened to me, with 2 different tuners tunes. Mainly 1st to 2nd.

BerBer63

i've had it stock, kleemann and eurocharged tune...its trans adaptation/misshift/trans limiter control... my guess

loungn14

we figured out the solution on the 55 platform, and it should easily transfer over to the 63. A ECU reflash that would be needed, and remember that we always have offered FREE retunes! We will contact a few customers to have the 63 retuned, to verify and let you know.

xtyper

Very impressive EC, way to go!

Hmmm, so does this mean all the other major tuners need to figure this issue out too and adjust their tunes accordingly?

loungn14

thanks!

Can't answer that question really, I guess it all depends on their process and if they have the access to that part of the ecu.

bluejae

simply awesome!

when will the next tuning day in dallas be?

Jon2007E63P30

I HAD this problem on my E63.

It was easy to make happen in the following way. Put in S, select 1st, speed up to 4000 RPM, and then floor it. The tranny (722.9) simply can not shift fast enough to avoid the rev limiter. Same thing happens if you do this in second.

The problem magically went away after I had attended the SL65BS press launch at Laguna Seca. The car also seemed to be a little quicker after that.

Odd that Mercedes has not solved the problem since I am sure they know it happens. It may be that having the transmissions shift fast enough to avoid the limiter can reduce transmission life.

JRCART, you know more about the strength of these transmissions than anyone outside MB, what do you think?

jrcart

I think Earl, Keith and I have all proved that these transmission can handle more than the 700 or so crank HP AMG claimed they could handle. That being said Earl and I have taken the proactive approach and asked Weistec to make some improvements and strengthen up whatever they could because we know its just a matter of time before something goes boom with the new HP we are pushing. Without going into too many details, if all goes well with track testing this week and next with the new transmission I suspect Weistec will be making an announcement regarding the details of the new upgraded trans and making the parts available for sale on their site. The trans has been being road tested on our cars for the past month or so and everything seems to be running perfect. Since Weistec always seems to take a cautious and conservative approach to developing their products they are going to remain tight lipped until we get the track testing done. A top speed event and a drag event or two next week should tell us everything we need to know. I will say to anyone that is seriously interested in the new trans upgrades to at least shoot an e-mail off to them letting them know you're interested and to get your name on the list because the demand for them is going to be huge once evryone sees what it can do and once its released, its VERY impressive to say the least.

Even Money

Is this trans upgrade for the torque converter style trans, seems the MCT can handle plenty.

Zod

yes it happens and is not new...its just people dont talk about things..

Only way to fix it from the user side is to use M mode and shift slightly earlier to make sure you don't hit the rev limiter, until you get better at it GL

c32AMG-DTM

I'd love to see it happen, but I think it's going to be tough to break 200 mph at the Airstrip Attack.

Think of it this way: at standing one-mile events, cars that normally trap in the high 120's in the quarter, might break into the 180's at the mile mark. So, by 1/4 mile in, they might already be at 125ish, and with a full 3/4's of a mile to go, only reach 185ish. That's only 60 mph added on in the final 0.75 miles.

By comparison, you're talking about starting at 50 mph, and then adding 150+ mph, in a half-mile stretch. Sounds like a tall order.

dodger63

Yea that sounds nuts, it doesn't seem possible thinking about speed over distance, its 2640' and it'll pass in 10 seconds unless your car does 60-200 in 8 seconds?? Who knows maybe it could happen

jrcart

I have no idea what to expect. I did some research and found some of the following speed from other rolling start half mile events.

2007 Viper w/turbo 1000 crank hp 203 mph

2010 Corvette ZR1 900 crank hp 194 mph

2004 996 tt 890 crank hp 205 mph

Obviously wind, elevation, incline/decline, DA, weight gearing and a bunch of other things are going to factor in. My car is close 1000 crank hp and has a similar drag coeffient of the ones listed above so who knows??? That being said I also found some 1000 crank hp cars with speeds in the 180mph range. Its going to be fun no matter what, hopefully I can represent and post up some respectible speeds for all the AMG guys.

jrcart

...one more thing, I was trapping at 136mph in the quarter mile last year when only making 660rwhp, that 136 mph in the quarter mile from a dig. Now add an additional 140 or so rwhp, a 50mph rolling start and a half mile.

Merc63

Wind resistance is huge factor at those speeds. Check out the setup Renntech used on their C63 to gain 9mph in the standing mile.

c32AMG-DTM

You mention those were half-mile rolling-start trap speeds. Do you know if they all started at 50 mph or lower though? The airstrip attack site mentions the rolling start is 25 - 50 mph... so 50 is the max.

Apparently, you guys are going to get a 1.8% decline, so that should help a lot. The 1700 ft elevation won't be ideal, but shouldn't hurt a boosted engine too much.

Look forward to the results, and regardless of what the trap speeds are, good luck and be safe out there.

jrcart

We will be able to start at any speed we see fit between 25 and 50 mph, this is beneficial because all cars have a different sweet spot depending on gear and redline.

dodger63

That is intense to think that they can get to that speed.. good luck

Sincity

So what is the solution? I'm getting a rough 2-3 shift in S mode when it shifts at 4k and between 4-5k.

bhamg

Once you finish break-in, it'll smooth out.

kustom2k1

Did Jcart go 200