11.66 @ 121.14mph

[Charlie Brown]

In other news: Using an app HP calculator based on weight (4600lbs including a half tank of 93 pump gas and 200lb driver) and either trap speed or ET I get some interesting results.

Trap sped gives 638hp
ET gives 573hp

Gaps in these two calculations indicate to me the car was not as efficient as it could be and given a more efficient run (better grip, launch or driver) the car will lower its ET. Thus the reason I think this car in good conditions on a good track with good driver will run a mid 11 sec ET.

Personally, I'm gunning for an 11:50 with no tune or other HP mods. At the Route 66 raceway they seem very rigorous about enforcing NHRA safety rules which means I'll get kicked out unless I install a roll bar. So that's my goal, get kicked out!!

[bm5bullit]

[QUOTE=Charlie Brown;13976318]In other news: Using an app HP calculator based on weight (4600lbs including a half tank of 93 pump gas and 200lb driver) and either trap speed or ET I get some interesting results.

Trap sped gives 638hp
ET gives 573hp

Gaps in these two calculations indicate to me the car was not as efficient as it could be and given a more efficient run (better grip, launch or driver) the car will lower its ET. Thus the reason I think this car in good conditions on a good track with good driver will run a mid 11 sec ET.

Personally, I'm gunning for an 11:50 with no tune or other HP mods. At the Route 66 raceway they seem very rigorous about enforcing NHRA safety rules which means I'll get kicked out unless I install a roll bar. So that's my goal, get kicked out!![/QUOTE

Agree 100% on your assessment as I had done some calcs with the power/speed calculator on some of the very first times posted by different people out there. The times produced by these latest runs are close to optimal for the M. Congratulations on the awesome runs.

[stealth.pilot]

Originally Posted by Charlie Brown

In other news: Using an app HP calculator based on weight (4600lbs including a half tank of 93 pump gas and 200lb driver) and either trap speed or ET I get some interesting results.

Trap sped gives 638hp
ET gives 573hp

Gaps in these two calculations indicate to me the car was not as efficient as it could be and given a more efficient run (better grip, launch or driver) the car will lower its ET. Thus the reason I think this car in good conditions on a good track with good driver will run a mid 11 sec ET.

Personally, I'm gunning for an 11:50 with no tune or other HP mods. At the Route 66 raceway they seem very rigorous about enforcing NHRA safety rules which means I'll get kicked out unless I install a roll bar. So that's my goal, get kicked out!!

Are you saying your time was set while carrying half a tank of petrol?

[wisesoul]

Originally Posted by johnsama86

LC triggers with suspension setting comfort? I thought only all Sports + would trigger LC

DSC off and M3 mode is all it needs!

[Northern X5M]

Originally Posted by Charlie Brown

At the Route 66 raceway they seem very rigorous about enforcing NHRA safety rules which means I'll get kicked out unless I install a roll bar. So that's my goal, get kicked out!!

Check your track rules. My track has modified their rules for stock/unmodified cars running slower than 10.0 and 135 mph to wave the roll bar rule.

Originally Posted by stealth.pilot

Are you saying your time was set while carrying half a tank of petrol?

I think we need this. More weight in the back. I was running with barely 1/4 tank and could not hook up no matter what I did.

One thing I did notice about this car is how well it cools down between passes. With the wait time I actually had to start my car in the staging area to keep it in operating temps. No popping the hood or pushing through the lanes. LOL.

[avlnch]

Originally Posted by Northern X5M

I think we need this. More weight in the back. I was running with barely 1/4 tank and could not hook up no matter what I did.

One thing I did notice about this car is how well it cools down between passes. With the wait time I actually had to start my car in the staging area to keep it in operating temps. No popping the hood or pushing through the lanes. LOL.

Yeah this car is by design built to cool down very well. Next time you detail your car take a look through the side and center intakes. M jammed them in well and thoughtfully.

No cooling upgrades needed for more HP that's for sure.

[Simon H]

I think this contradicts what some of the tuners, were saying about the M5 at the beginning. I remember them saying the M5 suffers from horrendous heat soak, and that multiple, consecutive drag runs, would see big discrepancies in times, and that cooling mods would be needed, maybe even charge coolers ?. I havent seen, or heard about this again, since that time. Regards, SIMON.

[stealth.pilot]

Originally Posted by Simon H

I think this contradicts what some of the tuners, were saying about the M5 at the beginning. I remember them saying the M5 suffers from horrendous heat soak, and that multiple, consecutive drag runs, would see big discrepancies in times, and that cooling mods would be needed, maybe even charge coolers ?. I havent seen, or heard about this again, since that time. Regards, SIMON.

I don't think it's an issue. I drove to the track 110miles at speeds between 100-130mph and then as soon as I arrived did 2 consecutive runs, and the second run set my fastest time. Engine was clearly hot. All my runs were pretty close.

It may be an issue if you're doing 70 laps at Silverstone, but not on a drag strip.

[mainly]

Originally Posted by Charlie Brown

All my runs except the one attempt with LC were in D3. No ability to rev before launching using D3. My technique was to shallow stage the car, hold brake with left foot, floor the gas, release the brake, wait for it...(seriously, it feels like it takes a second before the car responds. I could do this between the top and second yellow and not red-light). BANG! The revs shoot up and the car launches. Then it's a matter of modulating the throttle a bit and keep the rear wheels behind the front wheels.

Next time out I'm going to try S3.

i don't get it, you say there's no ability to rev before launching in D3 (why, what happens?) , but then you said your technique was to hold the brake and floor the gas??

[Charlie Brown]

@Stealth - "Are you saying your time was set while carrying half a tank of petrol?"

Yep, half tank of fuel.

[Charlie Brown]

i don't get it, you say there's no ability to rev before launching in D3 (why, what happens?) , but then you said your technique was to hold the brake and floor the gas??[/QUOTE]

That's correct. I use my left foot on the brake to hold the staging line. Then floor the throttle on the 2nd yellow and release the brake. The car does nothing, no rev, no acceleration then WHAM, rev shoot up and the car launches. This thing behaves nothing like a manual or even standard type automatic.

I did try foot brake and easing on the throttle then flooring it after the car begins to move. That netted a 12.21.

[bm5bullit]

Looks like there is a lot of good info being generated on this thread regarding starting line technique. Saves me tire rubber and time.

[Ryan@IND]

Charlie Brown's time slip from the weekend!

[Tylerstar]

Has anyone tried lowering the RPM's when using Launch control? I lost to a modded 5.0 off the line the other day using LC, all I got was a big burnout when I used it.

[Charlie Brown]

Originally Posted by Tylerstar

Has anyone tried lowering the RPM's when using Launch control? I lost to a modded 5.0 off the line the other day using LC, all I got was a big burnout when I used it.

LC seems inconsistent which is frustrating. Sometimes it launches, other times it just spins. I thought the point of LC was to control excessive wheel spin. I wish I had the engineer's design of this system so I would know what it's supposed to do and how it does it.

[wrsbmw]

How would 10 bowling balls in the trunk affect it? Makes my rear ride lower. I carry that many because I use em. It's around 300 lbs more. It makes the car look pretty good I think because the rear sits lower but that's just my opinion.

[Tylerstar]

Originally Posted by Charlie Brown

LC seems inconsistent which is frustrating. Sometimes it launches, other times it just spins. I thought the point of LC was to control excessive wheel spin. I wish I had the engineer's design of this system so I would know what it's supposed to do and how it does it.

+1, I believe the older M5's had 2 modes of launch control, one for a burnout mode, and one for a launch. Is there something were missing here? Iv'e launched mine a lot of times and the majority of it actually not doing a burnout is 1-10. Im gonna test my theory and try to lower the RPM's. Impressive time!

[stealth.pilot]

Originally Posted by wrsbmw

How would 10 bowling balls in the trunk affect it? Makes my rear ride lower. I carry that many because I use em. It's around 300 lbs more. It makes the car look pretty good I think because the rear sits lower but that's just my opinion.

Would create understeer but help traction off the line.

[wisesoul]

Wow, time slip makes it official! Not that I ever doubted the M5 (driver gets SOME credit )

I've never actually used LC, I've gotten the car to engage it but never let go of the gear lever. I was in my garage at the time so that would've been awful. This video shows an M5 launching pretty nicely @ 1:00

[URBAN LEGEND]

Originally Posted by Tylerstar

Has anyone tried lowering the RPM's when using Launch control? I lost to a modded 5.0 off the line the other day using LC, all I got was a big burnout when I used it.

Oh lord. You are probably immortalized in the 5.0 forums. M5 can't touch us...

Knowing how we bring the pain in the highway. True story.

[mainly]

Originally Posted by Charlie Brown

That's correct. I use my left foot on the brake to hold the staging line. Then floor the throttle on the 2nd yellow and release the brake. The car does nothing, no rev, no acceleration then WHAM, rev shoot up and the car launches. This thing behaves nothing like a manual or even standard type automatic.

so let me get this straight.

you say you hold the brake, but how hard? just lightly? or all the way down?

i would think if you're just lightly on the brake when you floor the gas, as you say you did, the car would start to move right away no?

or are you hard on the brake, floor the gas, then off the brake?

[mainly]

Originally Posted by Andrew@IND

Charlie Brown's time slip from the weekend!

hey look, the guy on the right had a faster speed.