RK Autowerks intercooled supercharger: Any dragstip times? - Page 2 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #11 of 16 Old 9th November 2012, 08:10 PM Thread Starter
TJordan
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Originally Posted by tacoma330ci View Post

We've got great specials going on right now if you wanna strap on one and be the first RK S2 in the books!
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I've been on the fence for a while, but your kit is definitely the most sorted out in my opinion and would be my first choice.

In regards to heatsoak, is it fair to say that any supercharged e39 m5 will most likely run significantly slower on a hot day or after a couple of acceleration run without an intercooler or methanol injection? I remember watching an M5 with a VT550 kit on a dyno pull event and each consecutive run the WHP fell dramatically. Maybe 50 hp from 1st to final pull.

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Track conditions and density altitude will have a huge effect on results, even with IC and/or meth. Of course, driving skill plays a role as well. Drag racing might be dumb, but it sure isn't easy in a nearly two ton car with IRS.

A S/C'd car without any intake cooling will quickly heat soak and disappoint. I always iced the plenum, discharge tube and Vortech between runs. Even so, on warmer days the car would come off strong and then lay down on the back eighth. I could feel it pull timing as the IAT's rose in mid-run. That's a bummer when you pulled a 1.7 60'. An IC or meth would likely remedy that issue.

My 11.7 runs were before I installed the methanol injection and I only had one occasion to run with meth on my home track. In back to back pulls I was .3 quicker and 3 mph faster without the meth. Too much fueling on a cool day? Not sure, but that's what it felt like. Your results may vary.
Sounds like 11.7's are about as quick as a supercharged e39 will run for now? How much slower would you be with standard performance tires? The reason I ask is because I have a couple buddies with E55's and they destroy my M5 from any speed, especially from a dig. One is modded and has pulled a z06 from a roll. I was hoping to compete by adding a blower and showing them true M Power, but not sure it will be enough.

Do you happen to know how much rap the Buckhead M5 is producing?

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Originally Posted by bimmerule View Post
Why obsess with 1/4 mile marks? A more usable metric is 60 to 130 time. Take 3 runs back to back to back, pick the median. It eliminate bad driver/launch and takes into consideration of heat soak. Anything under 10 sec is respectable, under 9 is fast, under 8 monster!
I agree with you there. I'm far from an expert in launching my car and most my buddies like to do a pull from a roll to eliminate launch variables. However, not too many e39 M5 drivers seem to post 60 to 130s as well. I believe Clemster posted a 9.xx sec time.



Thanks fellas for the input!

Last edited by TJordan; 9th November 2012 at 08:23 PM.
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post #12 of 16 Old 9th November 2012, 08:35 PM
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Originally Posted by TJordan View Post

In regards to heatsoak, is it fair to say that any supercharged e39 m5 will most likely run significantly slower on a hot day or after an lengthy acceleration run without an intercooler or methanol injection?

Sounds like 11.7's are about as quick as a supercharged e39 will run for now? How much slower would you be with standard performance tires? The reason I ask is because I have a couple buddies with E55's and they destroy my M5 from any speed, especially from a dig. One is modded and has pulled a z06 from a roll. I was hoping to compete by adding a blower and showing them true M Power, but not sure it will be enough.

Do you happen to know how much rap the Buckhead M5 is producing?




I agree with you there. I'm far from an expert in launching my car. However, not too many e39 M5 drivers seem to post 60 to 130s as well. I believe Clemster posted a 9.xx sec time.

Thanks fellas for the input!

Yes to the heatsoak question.

I'm sure there are other cars/drivers out that are capable of running better times than I did. I do think mine was running pretty well for a stock car with just an ESS 92mm setup and 3.45 gears. I'm sure there are others that can drive better as well. Not enough people have tried.

I race with many E55's and they are freight trains. They seem to launch effortlessly and make massive torque across the board. You'll need more than an bolt on kit to compete with anything more than a stock one. I know this first hand.

Hard to say, but I suspect the BIP car was making 550+whp

I did some VBOX runs at the track and on a 11.9x pass, these were my numbers.

0-60 3.6 sec
0-100 8.6
60-130 9.8

I never got data from an 11.7 pass but probably would shave a .10 or so off the first two numbers. My 60-130 isn't great as I have to shift to 5th at 123mph and I lose serious momentum.

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Last edited by Clemster; 9th November 2012 at 08:40 PM.
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post #13 of 16 Old 9th November 2012, 08:43 PM
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0-60 3.6 sec
0-100 8.6
60-130 9.8
Stock 0-100 is 11.5!!!!
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post #14 of 16 Old 9th November 2012, 08:53 PM
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these Hungarians claim 0-100 km/h(62 mph) in 4.1 and 0-200(125 mph) in 11.5


BMW M5 Kompressor 550 Ps Einzelstück ! als Limousine in Kecskemet

according to fastest laps F10 runs 11.9 1/4 mile and 11.7 0-125 mph

http://www.fastestlaps.com/cars/bmw_m5_f10.html

Last edited by areout; 9th November 2012 at 08:54 PM.
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post #15 of 16 Old 9th November 2012, 09:21 PM
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Originally Posted by bimmerule View Post
Why obsess with 1/4 mile marks? A more usable metric is 60 to 130 time. Take 3 runs back to back to back, pick the median. It eliminate bad driver/launch and takes into consideration of heat soak. Anything under 10 sec is respectable, under 9 is fast, under 8 monster!
-mid 9s with a stage 1
-8.8 when i had a stage 2
-7.9 with my V1 maxed out

i should be in the 6s by now, maybe even the 5s. The 2 shifts are what really hurt my times. But with gearing, its something im stuck with.

-R

Edit-I'll try and dig up the graphs too.

Last edited by tradin1; 9th November 2012 at 09:23 PM.
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post #16 of 16 Old 10th November 2012, 01:00 AM
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maybe even the 5s.
that's veyron territory no? But if we count AWD loss then you might be close to its wheel HP anyway...
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