chiromikey

I tested the hold method and it was about .15-.2 slower. Brake boosting works best but you can't hold a steady rpm. To get the best launch you have to be building rpms when you launch to get it to launch above 2k rpms. You can't go above 2k and hold it steady waiting for the tree or the ecu cuts power.

chiromikey

I'm sure an 11.2 or better is possible here in our DA with a 1.6 60ft time on proper tires and not having to worry about pedaling a high 1.8 to low 1.9 60ft time on street tires.

Amg63-

thats tough, so basically rev up while on the brake, then release it right away after 2k rpm?

for the streets this makes it too complicated, is the next best launch method to use the "hold" brake?

also, does the launch control not hold rpm for boost at 3k rpms?

Amg63-

yes I think since you are 4matic once you get tuned you should be able to get those same times relatively easy.

Do you find with 4matic that the best method for launching is also to brake boost it?

Geno51

all my fastest times are brake boosting it hands down

TTMerc

There is also a time limit you can do this. At least it seems that way.

chiromikey

Agreed

10speed

These times you guys are talking don't seem to impressive for tuned cars, The AMS YouTube vid of there e63 4matic does a 10.80 10 times in a row and capable of 10.50 , That's just with full exhaust and tune.

Amg63-

I wonder what method AMS use for launching it. Power wise the EC stage 2 and AMS tune seem to make about the same.

If i understand correctly your supposed to rev quickly up to 2k then quickly let go of the brake because holding the rev will cut power.

Did anyone try launch control? Maybe this makes it more consistent.

Geno51

First off my car is stock. And secondly take the AMS car up to 4700 feet. Pretty much Denver Colorado and see if it runs mid 10s. I will help you it won't.

My car car early in the morning it was trapping 123.xx it did the 2 times. As the air heated up and the DA started to climb my trap speeds started to drop. And by the end of the day I think it was as low as 119mph

Also the AMS car is awd and Mikes car is rwd and on street tires on a poorly prepped track that he can't even use full throttle in first gear. I'm sure with sticky tires in good air he could see a 10 second pass also

kponti

Chiromickey, what is traction like for you in second gear?

Geno51

if I recall he hooked up fine in second. It was most of first gear that was the issue. I think I recall that he said he could go full throttle right at the very top of first right before it shifts to second

Chappy

Committed to date:

Chappy / E63S Wagon (2014)
Mooneypilot / SL55 (2004)

chiromikey

Once you understand density altitude it will make sense to you. This is why I provided the DA number. Also, the AMS car was awd with proper race compound tires and a properly prepped track (although I don't think awd will make a difference once I have drag radials).

chiromikey

Correct

10speed

Ok thanks, I didn't realize the times where lower due to the altitude

Amg63-

so when brake boosting just curious how fast do you need to be with it roughly before letting go of the brake before ECU cuts the power down?

Wickdwagon

I was under the impression that the best combos for our cars to get the best time possible are the following:

No more than a 1/4 of fuel
Dyno Mode
S+
Dampers on II
AC and all other bits off.

Once staged....roll RPMS to 2800 briskly and side step off the break. I was told that a shoe with a hard sole and very little rise is best. Once you side step the break matt the hooligan pedal and hold on!

Another thing that I have always been told is since most of these session are at Test n Tune sessions that the tree is meaningless. Get staged. And once you get the boost to where you want it, launch. The tree is meaningless. Given the challenges with the boost this card would be very hard to race against another very competitive car!

Is everyone also weighing the car and drive after your runs? I rolled over the scales in the wagon at 5050.

chiromikey

The tree is meaningless on a test-n-tune day but when they throw you in a bracket class for money or you're grudge racing a Hellcat or CTS-V with 80 more whp than you it becomes important!

Wickdwagon

gotcha...these cars are hard to launch and I am much more interested in finding some soft rolling start venues. As we can all say that upgrading the trans is not needed but all that torque trying to get 5K# moving there are a lot of things to break. I just have not found the right place in NJ to have a more realistic exhibition of power.

Chappy

5050....wow. Didn't anticipate over 5k.

Why in dyno mode?

Wickdwagon

Well I am a pretty large dude so you can subtract 150# as well as we had a bunch of tuna gear in the car. I was told dyno mode as that turns all of the electronic nannies off from a traction perspective.

Amg63-

So you need to side step briskly at 2800rpm, is this to "fool" the ECU into thinking your not trying to brake torque it?

it sounds like if your at a light and hold it there the ECU will actually slow you down more than not using this method.

chiromikey

Hopefully this event gets a few E63s out and they can experiment!

Chappy

Weather looks decent for Sunday. Should be fun!!