|
|
04-22-2009, 05:51 PM | #1 |
Major General
285
Rep 6,007
Posts |
Where's the 1/4 mile times???
We need to get some 1/4 mile times to compare aftermarket mods. In my opinion this will be far better than dyno results. This is the real world and what all of us will be feeling when we drive our cars. The dyno results posted on this board are all over the place, even on stock cars. It's way to easy to manipulate the dyno to show gains. Many people don't even know how to use a dyno correctly to get accurate real world readings. Especially to show gains with ECU flashes. If you're not using the dyno correctly and go to tune the ECU you are doing nothing more than correcting your dyno mistakes. Here's a couple interesting reads on dynos
http://www.dinancars.com/bmw/technia...ern-bmw-engine http://raceprecision.com/forums/viewtopic.php?f=3&t=105 Of course every 1/4 mile pass will be different, but so is every dyno run. You need a good number and an average with the same driver. Baseline then with mods.
__________________
|
04-24-2009, 07:21 AM | #2 |
Major General
285
Rep 6,007
Posts |
No one's with me on some 1/4 mile times? Is this cause most bolt on mods won't show any improvement in 1/4 mile times?
The other good thing about 1/4 mile time comparisons is you can show improvements from mods such as weight reduction, differential gears, possible quicker shifts with ssk or clutch stops, suspension changes (although those are better on a track for a M3). No need to worry about how to setup a fan to get your scoops to work.
__________________
|
Appreciate
0
|
04-24-2009, 07:44 AM | #3 |
Major General
1290
Rep 7,389
Posts |
You go first.
If you do your baseline on a dyno and then the after on the same dyno, with the same correction factors, then the difference is real. If you want to risk your rear end on a drag strip, then go ahead. I'm looking forward to your report. Dave
__________________
|
Appreciate
0
|
04-24-2009, 09:04 AM | #4 | |
Major General
285
Rep 6,007
Posts |
Quote:
Your rear end isn't risked anymore on the drag strip than any time you drive your car. Unless you're not flooring it, in which case your aftermarket mods mean nothing anyway. If I had a local drag strip I'd be more than happy to post times.
__________________
|
|
Appreciate
0
|
04-24-2009, 09:19 AM | #5 | |
Major
156
Rep 1,430
Posts |
Quote:
__________________
|
|
Appreciate
0
|
04-24-2009, 09:27 AM | #6 | |
Major General
285
Rep 6,007
Posts |
Quote:
I think many people would be shocked to see the thousands of dollars they're spending on mods are not going to give them the time gains they would expect in a 1/4 mile. Showing a .1 difference in 1/4 mile time looks a lot less impressive than showing 10Hp or so on a dyno.
__________________
|
|
Appreciate
0
|
04-24-2009, 11:08 AM | #7 |
Resident Engineer
135
Rep 748
Posts |
It's a valid point, but does it hold true for the e92? (Axle Breakage in specific)
Last edited by Oakleyguy; 04-24-2009 at 11:26 AM.. |
Appreciate
0
|
04-24-2009, 11:16 AM | #8 |
Major General
285
Rep 6,007
Posts |
I agree PG, but I think you only get cherry picked results from the aftermarket tuners here with their dynos too.
As for those worried about destroying their rear end... What about launch control? If your rears gonna blow why would launch control come from the factory? I just think showing 10-20hp on a dyno (330 whp - 350 whp) looks far more impressive than showing 12.8 down to 12.7 or 12.65 on a 1/4 mile. Like you said there's driver error, but there is also mechanic error on the dyno... No system is perfect for measuring gains. But actual driving from a dead stop on pavement is how my car really spends it's time, and that is where I'm concerned about performance gains showing. Not on a dyno staying still inside of a shop.
__________________
|
Appreciate
0
|
04-24-2009, 11:23 AM | #9 |
Major General
374
Rep 8,033
Posts |
I agree with dcstep that these cars will most likely not hold up all that well to repeated 1st gear full out high torque launches. That's not what they are designed for. This is speculation on my part as I don't have evidence to back it up, but I don't see the point of risking my car just to find out.
__________________
|
Appreciate
0
|
04-24-2009, 12:15 PM | #12 | |
Colonel
68
Rep 2,194
Posts |
Quote:
I would never launch it hard for 1/4 mile runs this is a track car for me and not a 1/4 mile car.
__________________
2012 E92-M3 Space Grey on Fox Red, DCT
2011 B8 S4 S-Tronic , Black on magma red |
|
Appreciate
0
|
04-24-2009, 12:23 PM | #13 | |
Captain
40
Rep 660
Posts |
Quote:
they are in the mid 13's................ |
|
Appreciate
0
|
04-24-2009, 12:30 PM | #14 |
Enlisted Member
3
Rep 42
Posts |
J08M3 you have a PM from me check it out, maybe it can help you
I've been looking on the dragtimes site and I spotted an e9X m3 with something like 12.3 if I remember right... |
Appreciate
0
|
04-24-2009, 01:10 PM | #15 | |
Major General
285
Rep 6,007
Posts |
Quote:
damage far exceeding a blown rear from a drag strip.
__________________
|
|
Appreciate
0
|
04-24-2009, 01:26 PM | #16 |
Lieutenant
28
Rep 491
Posts |
I'm probably heading to the drag strip this tuesday. I'll let you guys know how it goes. I have a 6mt, AA ECU, AA pulley, Remus race exhaust and magnaflow x pipe. I will also be using a mixture of 93 and 100 octane.
|
Appreciate
0
|
04-24-2009, 02:06 PM | #17 |
Major General
285
Rep 6,007
Posts |
Low 12's maybe??
__________________
|
Appreciate
0
|
04-24-2009, 02:16 PM | #19 |
Major
156
Rep 1,430
Posts |
Mechanical failure and driver error are two completely different things.
__________________
|
Appreciate
0
|
04-24-2009, 02:18 PM | #20 |
Major General
285
Rep 6,007
Posts |
Absolutely true, but both are equally bad and it seems much more expensive when the crash is on a road course or street. Also seems to happen much more by amount of videos posted.
__________________
|
Appreciate
0
|
04-24-2009, 03:57 PM | #21 | |
Major General
1290
Rep 7,389
Posts |
Quote:
You don't know much about drag racing do you? If you go to a serious track, there'll be traction enhancer in a concrete start box. The stress on the rear end, even with street tires, is several time the stress of autocross or lapping at a high speed track. I used to run a 5.0 Mustang in ESP at SCCA and many of the guys also drag raced. The ESP rules limited them to stock splines and trannies. ALL that did more than a few drag runs either busted the tranny or twisted an axleshaft. This is like a Ennis, TX, which is a SERIOUS strip, with guys running 300 mph quarter miles. Still, even lesser strips will goop up the start box. It really stresses the rear end. Like I said, if you don't believe me, take your M3 out and run three runs before and three after and tell us how it went. There's a reason the serious drag guys run 9" truck rear ends and 32-spline axles. There's not making much more hp than us and maybe double the torque. The M3 is NOT designed to drag at pro strips. On the street you're ok, because the wheels will spin before you break anything, but the strip is another matter. Dave
__________________
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|