M3 v M4 VBOX Comparison

[turbo8765]

What's the elevation over the course of the runs?

[jc05e46m3]

Originally Posted by MRSSIIM3

to those doubting the data:

you guys can choose to believe it or not believe it. don't really care. its data straight off my vbox which refreshes 20 hz / second via GPS so if anything its more accurate than even the actual bmw speedometer. i only posted it because of the several threads asking for vbox data. i wasnt even going to post the screenshots of my vbox app but i realized there would be no way anyone believed me without them, so i posted those...but to say its not the same as time slips...read up on what at vbox does first lol

http://www.vboxmotorsport.com/index....ers/vbox-sport

was around 40-60 feet above sea level with 50-70% humidity

Let the naysayers do their thing. Thanks for the data!

[MRSSIIM3]

Originally Posted by turbo8765

What's the elevation over the course of the runs?

10-20 foot downward slope depending on the run. check previous post though i tested in both directions and achieved very similar results.

[solstice]

Originally Posted by jc05e46m3

Let the naysayers do their thing. Thanks for the data!

+1

[gmd2003]

Originally Posted by MRSSIIM3

Hey Guys,

Since everyone has been asking for V-Box data, I went out and did some testing.

I picked up my SSII / SO M4 last week and still have my full bolt on e92 M3. Did a bunch of testing on the same flat road on pump gas from the same station and here were the best runs from both cars. Weather was around 75 degrees and I'm at sea level. For reference, my e92 dynoed at 396 whp and M4s on the same dyno are getting around 420. So the results make sense

M4 0-60: 4.35
M4 60-130: 9.38
M4 1/4 Mile: 11.82 @ 122.3

M3 0-60: 4.23
M3 60-130: 10.13
M3 1/4 Mile: 11.95 @ 120.5

M4 is making serious power stock.

M3:


M4:


In terms of which car I like better...they are different beasts. Wouldn't really say the M4 is better than the M3, however its easier to drive and handles/brakes better. Still getting used to the engine though. Obviously the NA sounds better though...although the M4 doesnt sound bad whatsoever.

What was the percent slope of the runs ?

[pfl]

122mph trap is moving!!! I keep being amazed on how fast the F8x platform is proving to be, stock.

[SakhirM4]

Originally Posted by gmd2003

What was the percent slope of the runs ?

He already answered that question.

[Sektion9]

insightful data for sure, thanks for posting!

[Black Gold]

What was the m3 0-100?

And no one is calling you a liar, just expressing surprise at how quick both cars performed. The delta between the two seems appropriate IMO. The lack of traction the m4 suffers from (evidenced from slower 0-60) indicates it's even faster than the traps would indicate when run from a roll. I would guess the 0-100 differnce is close to .75-1 second.

[MRSSIIM3]

Originally Posted by KennyPowers

What was the m3 0-100?

And no one is calling you a liar, just expressing surprise at how quick both cars performed. The delta between the two seems appropriate IMO. The lack of traction the m4 suffers from (evidenced from slower 0-60) indicates it's even faster than the traps would indicate when run from a roll.

oh on the m3, sorry. thought you guys meant the m4.

i had the app set up weird at first with what it was logging. so i didnt have a 0-100 mph. but i had a 0-200 meter that trapped 7.79 seconds at 95.5 mph. so thats almost 100mph

0-95.5 mph @ 7.79 on the M3. I estimate this would be a 0-100 of 8 flat

vs.

0-100 mph @ 8.58 on the M4

So it seems like what is happening is because of the poor launch and traction problems all the way up to 3rd gear in the m4, the m3 actually has an edge. but once the m4 finally grips it just pulls away

[DocWeatherington]

Originally Posted by KennyPowers

If you read the op he states all of this information

Its like a Playboy who reads details. You go straight to the stats and pictures.

[gmd2003]

Originally Posted by gmcconn535

He already answered that question.

Actually he didn't . % slope is the elevation change over the length if the run . It's very important in comparing data . The VBox sport app shows the starting and ending elevation of a run as well as the length so all he has to do is show the screenshot .

[Andrew115]

Originally Posted by DocWeatherington

Its like a Playboy who reads details. You go straight to the stats and pictures.

I didn't read the thread but I have quickly skimmed for the Playboy - didn't see it.

[dclowd9901]

Why's everyone so surprised? Didn't BMW advertise a 3.9 second 0-62 with the DCT? If anything, his numbers are a bit low...

[slalomfever]

it wont be long...someone will be in the 10 sec club

[turbo8765]

Originally Posted by slalomfever

it wont be long...someone will be in the 10 sec club

M5/6 guys said the same thing at about the same point in the development process.

Sorry, don't meant to be rude... But 11.8 and 10.9 are two VERY different things.

[SakhirM4]

Originally Posted by gmd2003

Actually he didn't . % slope is the elevation change over the length if the run . It's very important in comparing data . The VBox sport app shows the starting and ending elevation of a run as well as the length so all he has to do is show the screenshot .

I know what % slope is, but you are right - I apologize. He did not state % slope. He just said it was a 10 -20 foot drop over the run. I just assumed that would provide %, given distance was a quarter mile. But that was an assumption. Sorry.

[gmazet]

impressive mph's there.

[DrtyJrze]

Originally Posted by turbo8765

M5/6 guys said the same thing at about the same point in the development process.

Sorry, don't meant to be rude... But 11.8 and 10.9 are two VERY different things.

I agree. Plus that is going to be a very expensive second (that will mainly be for bragging rights).

[gmd2003]

Originally Posted by gmcconn535

I know what % slope is, but you are right - I apologize. He did not state % slope. He just said it was a 10 -20 foot drop over the run. I just assumed that would provide %, given distance was a quarter mile. But that was an assumption. Sorry.

I would prefer he show the data so we don't estimate , but if it was 20 feet then it would be a -1.6% slope which would explain the fast ET despite a bad launch as well as the higher than expected trap . For a Vbox quarter mile to be valid it has to be less than 1% slope , and preferably be close to 0. In the same conditions on a NHRA track his car would prob be 12- 12.2 @ 119 -20 mph so consistent with previous fastest DCT data .

[MRSSIIM3]

Heres the screenshot of distance:

[gmd2003]

Originally Posted by MRSSIIM3

Heres the screenshot of distance:

Sorry it is blurry , can't read it .