khmergod

Was wondering if it would be possible for that set up to hit less than 12 secs on the track on 1/4. Stock without P31 and LSD averaged 12.5 @112-114mph.

propain

I dont think you will get sub 12's with the P31 alone. The LSD is not going to help you much on the 1/4 track either.

khmergod

Once my vehicle comes in I'll break her in to 1k miles and dyno her then maybe get her to a track in Houston.

propain

The LSD is not included in the P31 right?

khmergod

Correct.

khmergod

If I'm not mistaken I think CEK pulled 11.9 with P31 and LSD. Can't remember if he flashed or not. Can't find the post atm.

propain

I would be surprised if 480HP at the crank can get into sub 12's. Maybe on DR's but I think still it would be difficult. He must of had a file on the car.

propain

Look at this sig in this post it says 2010 P31 12.5 1/4

https://mbworld.org/forums/3970881-post52.html

khmergod

Thanks. The one with 11.9 was the newest run in a couple months back. He must have modded it or flashed it.

sflgator

I've heard that an LSD doesn't do much from a dig to 1/4mi. run as propain said; the LSD is much more helpful when tracking the car around curvy track.

Raleighc63

My brother in law ran his at MIR and did best 12.349 @ 113mph... All stock... No P31.

khmergod

That's hot. Did he have LSD?

Raleighc63

NO. But did use my DR's..

SonnyakaPig

'
P31 cars are supposed to have about 415 rwhp. Imagine the "S" class maps in the C63. That's what I hear at least.

SonnyakaPig

The problem with not having an LSD is that you need DR's to get a good launch with the car.

Think about it, if you try to do a burnout with street tires and no LSD, you essentially just spin the right rear wheel. I'm sure at some point the left rear wheel starts to spin and heat up, but not very long if you're just doing a short burnout, which is what would be recommended with street tires.

So, when you have one hot and somewhat sticky tire and one colder tire, you can get wheelhop.

With DR's, you can get both tires to spin and heat up during the burnout and because the right rear wheel will hook with DR's, the E differential will send the power to the left wheel as well, and you'll get an nice effective launch.

sflgator

Well, I understand what you're saying in theory. However, as I understand it (from others w/ LSD), they don't get any better launches in the 1/4 mi. (or 60ft times) on street tires than those of us w/o an LSD. Hence, the LSD doesn't help w/ launches for whatever reason. What it does help with is drifting around corners and pouring on the throttle while coming out of the apex a lot quicker than a car w/o an LSD.

Dads C63

Yes you can. I ran 12.217 @ 114.45 in Florida in cool weather with no P31. Yes, I was on drag radials but the car was bone stock. Stock filters and everything. All we did was add some drag radials. I am sure with the P31 package at MIR or ATCO you could run in the 11's without a doubt. I only had 360rwhp stock and they are saying the P31's are making over 410rwhp. You will definitely get into the 11's with some drag radials and practice. Good luck!!

khmergod

Thanks for the words of encouragement. No wonder your handle is Dad. Your kids are very lucky to have such a badass father.

GHAZAN

without DR it would be tough me thinks, but close....mthis got I think the closest stock 12.2 no p31??

SonnyakaPig

Respectfully, I'm sharing my experience with the car. I know that with my car the launches are inconsistent because it really depends on the surface and condition of the pavement, and how much traction is available for my car in each instance. I have experienced how different my car hooks on launch depending on the burnout procedure.

I agree the LSD will be more beneficial coming out of corners. I can feel that on the street. But I think an LSD will help get the power to the ground more consistently and I would think and hope wheel hop would be eliminated.

I achnowledge our overall 60' times won't be better with an LSD, I mean our potential is unaffected by an LSD, but I think the consistency would improve and wheelhop would disappear. This is with street tires. DR's make up for the E diff.

propain

If its making 410 rwhp then its defintetly making more than the advertised 481 at the crank.

Your logic is sound however if it is indeed making 410rwhp. Now that you mention it I do remember someone dynoing a P31 putting down 420+rwhp. https://mbworld.org/forums/4163350-post1.html If he doesnt have a freak and you get a car like his than yes you can get into the 11's on DR's for sure.


Good luck with the new car and getting some 11's!!

C63newdude

That can make the whole different(being tune or not). I doubt anyone will do sub 12's stock.

drawde

didn't mthis do 12.1 with just DRs (and i think charcoal delete?)? pretty sure he doesn't have p31, as they didn't have it back then. sub 12's might not be so far away with a p31 car.

mthis

yes i did lol.

i ran 12.168@115.82MPH stock with DR's and stock filter just no charcoal.

this record can be broken, if someone is willin to come to atco tomorrow with stock c63 and Dr's ill help you beat that record.

dshaggy17r

What is DRs in your c63