M5/M6 Track Slips

[Hunter5179]

I know this is the M5 board but since we share the same motor and trans I thought I would post my experience here as well. Went to the track today and did 3 runs. Weather was a crisp 45-50 degrees with a chilly wind blowing at 15-20mph. I had my 21's on and my PSI was stock which is not ideal but I wanted to run it like I drive it. Even though I did burnouts before each run the temp and 15-20mph winds cooled the tires off pretty quickly so there was a little spinning. As you can see from the 60ft times they aren't great so there is a ton of room for improvement. Mind you I'm on 21's too. So considering all this if it was a little warmer out or not so windy and my tires were softer I can easily get the 60ft in the 1.60-1.80 range and the car will easily do 11.40's all day and could possibly go 10.90's-11.30's with less tire pressure or even smaller diameter wheels and slightly warmer temps for better grip. Also a thing to note is that I didn't boost the car at the start....the car has a slight delay after I floor it which affects the 60ft time do to the slight roll that happens that triggers the clock then the power kicks in. So if I boosted the turbos a little by holding the brake for 2 seconds and juice the throttle a bit then letting go of the brake I believe this car can go 10'90's-11.30's. I might even try launch control just to see. I had full traction off everything maxed out with the suspension in comfort. All I did was floor it. No tricks. Here you go. Check out the trap speeds and 60ft times and you will understand the potential. I'm always in the left lane. Feel free to add your slips, info and experiences at the track.

Couple other Nuts

[Tom C]

Nice runs! It is all going to boil down to how hard we can launch these cars. From what I have been seeing, the launch control RPM may be set too high and the off idle stomping of the throttle is starting too low in the RPM and causing some bogging off the line. It would be great to get a happy medium between the two.

I am curious what your car weighs with the 21's and stereo equipment, although the Akrapovic probably helped offset some of the weight gained on the other items. Did you get a chance to weigh it at the track?

[greentrbo95gst]

11.4's yes, 10.9's definitely no. You are in that range where dropping .1-.2 off your time takes a lot of effort, money and practice. Try using some drag radials and you will probably hit 11.4-11.5.
I can see a healthy car with full exhaust, catless dp's, Switzer tune, 150 shot, drag radials and front seats replaced by Sparco buckets doing 11 flat.

[Hunter5179]

Originally Posted by Tom C

Nice runs! It is all going to boil down to how hard we can launch these cars. From what I have been seeing, the launch control RPM may be set too high and the off idle stomping of the throttle is starting too low in the RPM and causing some bogging off the line. It would be great to get a happy medium between the two.

I am curious what your car weighs with the 21's and stereo equipment, although the Akrapovic probably helped offset some of the weight gained on the other items. Did you get a chance to weigh it at the track?

My 21's weigh a couple of pounds lighter than the stock 20" forged 343 wheels so no weight gain there. Sound system is about 100lbs but I think that might actually help off the line. Akra I believe shaves 20lbs off the car. I had just over half tank of gas. I did a run with a buddy of mine who weighs 220 and im around 210 and we did 11.7's. I did not get to weigh the car unfortunately but I'm looking to go back this weekend so hopefully if it works out I can get that info.

[Northern X5M]

Hear what you are saying about the launch.
I have found that launching off idle is the best, much better than flooring it and waiting for the delay. Flooring it bogs the car a bit and the launch is a bit softer than flooring it off idle. Also, agree that we are leaving alot on the table not being able to spool up the turbo at the line. With my X5M, the difference between launching off idle and brake stalling was about 0.4.

Bone stock I was able to cut a 1.77 with drag radials launching off idle. Car dead hooks and the launch is awesome. If we could launch these cars at about 2000-2500 rpm, we would see some great times, 10's for sure.

[Hunter5179]

Originally Posted by Northern X5M

Hear what you are saying about the launch.
I have found that launching off idle is the best, much better than flooring it and waiting for the delay. Flooring it bogs the car a bit and the launch is a bit softer than flooring it off idle. Also, agree that we are leaving alot on the table not being able to spool up the turbo at the line. With my X5M, the difference between launching off idle and brake stalling was about 0.4.

Bone stock I was able to cut a 1.77 with drag radials launching off idle. Car dead hooks and the launch is awesome. If we could launch these cars at about 2000-2500 rpm, we would see some great times, 10's for sure.

I bet I can get in the 11.4's if I launch off idle. I will try this weekend.

[Marcus Frost]

Hunter,

Do not go into the water box with street tires. You just wind up getting water all over your wheel wells/etc and it will actually hurt your ability to launch. You do want to do a small "burn out" in front of the water box, but it is meant to get small rocks/stones off your tires. Too much of a burnout on street tires can make tires greasy and will again, hurt your ability to launch.

You may also want to try your luck at Byron, which is where I've always ran my best times. GLD is not bad.

-m

[mainly]

i doubt youll see much better times than what you got here without other mods.

with warmer weather your 60 may improve sure, but the the other things, Et and trap speed will go down. these cars suck in the warm temperatures.

10.90's impossible, but you should definitely try launch control.

[Hunter5179]

Originally Posted by Marcus Frost

Hunter,

Do not go into the water box with street tires. You just wind up getting water all over your wheel wells/etc and it will actually hurt your ability to launch. You do want to do a small "burn out" in front of the water box, but it is meant to get small rocks/stones off your tires. Too much of a burnout on street tires can make tires greasy and will again, hurt your ability to launch.

You may also want to try your luck at Byron, which is where I've always ran my best times. GLD is not bad.

-m

Thanks for the onfo. I will check that track out.

Originally Posted by mainly

i doubt youll see much better times than what you got here without other mods.

with warmer weather your 60 may improve sure, but the the other things, Et and trap speed will go down. these cars suck in the warm temperatures.

10.90's impossible, but you should definitely try launch control.

The car will definitely go 11'4's. I've tried launch control once and it was worse than just flooring it. Lots of hopping and spinning. Had a quarter tank of gas when I tried it... full tank would probably be better. I will attempt the track again but the cold weather has put an end to this at least until march.

[Charlie Brown]

I'm also going try out Byron and Great Lakes with my M5. I've only run it at Route 66 Raceway. I'd like to hook up with with local M5/6 owners and swap notes on what's working and not working. I've run a personal best of 11:63 stock and 11:53 with DRs but had strange throttle and DCT activity due to the diff in diameter of the stock PSS front and MT ETII DR rear tires.



If you guys are cool with that, lets get together.

[Charlie Brown]

Sorry. Meant to attach this time slip to original post.

Btw. I agree we can get theses cars in the 11:4X with the right size DRs.

[stealth.pilot]

2013 M5 OEM specification on the right.

[Hunter5179]

Originally Posted by Charlie Brown

Sorry. Meant to attach this time slip to original post.

Btw. I agree we can get theses cars in the 11:4X with the right size DRs.

If I had that 60ft on my 11'6 runs I would have been in the 11'3's possibly. I'm down to hook up and hit the track as well.

[Tom C]

Originally Posted by Charlie Brown

Sorry. Meant to attach this time slip to original post.

Btw. I agree we can get theses cars in the 11:4X with the right size DRs.

FYI

Using a 0-60mph calculator that uses regressive math based on the timeslip info (and is unbelievably accurate compared to my simultaneous vbox data), your car did 0-60mph in 3.41s.

[Charlie Brown]

Originally Posted by Tom C

FYI

Using a 0-60mph calculator that uses regressive math based on the timeslip info (and is unbelievably accurate compared to my simultaneous vbox data), your car did 0-60mph in 3.41s.

I used the same math. Crazy for a car this heavy and RWD.

[Northern X5M]

Originally Posted by Charlie Brown

Sorry. Meant to attach this time slip to original post.

Btw. I agree we can get theses cars in the 11:4X with the right size DRs.

Did you end up using the 20" Nittos too? Sounds like you experienced the same weird shifting I did.
Nice 60'. My best was a 1.77, I think we might have found the 60' limit with the limited launch RPM we have. With my crappy DA best ET I could muster was a 11.68 with only carbon filters removed.

[Charlie Brown]

Originally Posted by Northern X5M

Did you end up using the 20" Nittos too? Sounds like you experienced the same weird shifting I did.
Nice 60'. My best was a 1.77, I think we might have found the 60' limit with the limited launch RPM we have. With my crappy DA best ET I could muster was a 11.68 with only carbon filters removed.

I used the MT ET Street II 305/35 20. Next year I'm going to get a set of stock 19 wheels and run the same tire in 305/35 19. I'm thinking no weird shifting issues and no loss of overall gear ratio should help get me into the 11.40s with stock tune and just charcoal filters removed like you.

I agree with you; I think I got all the 60' I could get given the way we have to deal with the DCT programming. I do think someone with a 6 spd manual could do better with DRs. However, with the proper size DR I think trap speed will go up 1-1.5 mph and ETs in the 11.45-47 range assuming good weather and track conditions.

[mr-karim]

Did you dyno your car? How many horses? Did you install any ECU tunings?

[SlashM3]

I don't understand was at the track today with 91F temps and launch control in a vert running 12.6s some one please help 12.6 at 118mph I don't understand.

[greentrbo95gst]

Originally Posted by Charlie Brown

I used the MT ET Street II 305/35 20. Next year I'm going to get a set of stock 19 wheels and run the same tire in 305/35 19. I'm thinking no weird shifting issues and no loss of overall gear ratio should help get me into the 11.40s with stock tune and just charcoal filters removed like you.

I agree with you; I think I got all the 60' I could get given the way we have to deal with the DCT programming. I do think someone with a 6 spd manual could do better with DRs. However, with the proper size DR I think trap speed will go up 1-1.5 mph and ETs in the 11.45-47 range assuming good weather and track conditions.

Any pics of the MT's on your car? Stock suspension? Any rubbing?
Sorry to bring the old thread back, but I just got the same tires in 19's.