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      09-12-2013, 10:06 AM   #45
infidel335
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Launch at 4k, shift to 2nd at 6k, shift to 3rd at 6k, shift to 4th just before redline.
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      09-12-2013, 10:58 AM   #46
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It would be more attractive for me if I didn't have to drive an hour and twenty minutes just to spin third all night in an AWD car.
Spinning awd in 3rd? I've skated around on that track but nothing that bad. Are you sure you're actually spinning your tires?

You have a 12 second car, you just need to knock your 60' down.
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      09-12-2013, 11:20 AM   #47
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Launch at 4k, shift to 2nd at 6k, shift to 3rd at 6k, shift to 4th just before redline.
You can gain time just from your shift points... first gear should be til redline, 2nd ~6300, 4th 6100.

Power drops so fast on our cars, you're out of the powerband near redline.

I thought you were auto, you launch at 4k? how? Also, have you tried a 2nd gear launch? If traction is that bad, it could help.
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      09-12-2013, 04:44 PM   #48
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Spinning awd in 3rd? I've skated around on that track but nothing that bad. Are you sure you're actually spinning your tires?

You have a 12 second car, you just need to knock your 60' down.
Front wheels spin shifting into 3rd.

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You can gain time just from your shift points... first gear should be til redline, 2nd ~6300, 4th 6100.

Power drops so fast on our cars, you're out of the powerband near redline.

I thought you were auto, you launch at 4k? how? Also, have you tried a 2nd gear launch? If traction is that bad, it could help.
Manual. Launching isn't too bad but I should be easily breaking 2 seconds in the 60ft. Best of the night was a 1.9. I haven't tried a 2nd gear launch, I don't think it's that bad yet.
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      10-21-2013, 03:42 PM   #49
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I wouldn't do a 2nd gear launch with a manual transmission, all wheel drive car. I'd imagine that would be very hard on the drive train and you would break something. Us auto transmission guys can get away with it as we are pre-loading the drivetrain and it reduces the shock to the driveline.

With only a JB4 G4 on map 5 (with about E40 in the tank) and a DCI, I managed to run a 12.1 in some pretty hot and humid south Florida weather. Link to the info is in my signature.
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      10-21-2013, 05:50 PM   #50
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I had good 60 foot times so I don't think a 2nd gear launch is necessary. I want to try an E85 mix at some point.
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      10-22-2013, 09:04 AM   #51
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This was an N55 stage 2. AFE CAI + BMS JB4 Map 2 + AR catless DPs. Fastest of the night was 12.6.

Go catless bro!
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      12-10-2013, 11:04 AM   #52
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Mustang GT 5.0L are FAST on slicks! I know that 5.0L was modded, but even thought... look at how he beats me... and remember I'm running 12.6@107

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      12-10-2013, 01:38 PM   #53
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You would need a whole lot of turbo to catch that guy.
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      12-10-2013, 07:34 PM   #54
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There was no way that thing was stock.
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      12-12-2013, 12:06 PM   #55
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Yeah I know.... 11.1@121 1/4 mile, and 1.5 sec 60 foot.... that's fast!
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      12-12-2013, 01:16 PM   #56
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Yeah I know.... 11.1@121 1/4 mile, and 1.5 sec 60 foot.... that's fast!
I just watched your "BMW 335i Before/After Alpina Flash" video on youtube. At 0:55, you start in M2 then switch to M1 after you rev it up for the launch??
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      12-13-2013, 09:41 AM   #57
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I just watched your "BMW 335i Before/After Alpina Flash" video on youtube. At 0:55, you start in M2 then switch to M1 after you rev it up for the launch??
Oh... You're the first one who notice that... (including myself ). I guess I had forgot to downshift to 1st gear (M1)

Here's another one - much better launch

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      12-13-2013, 04:15 PM   #58
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Oh... You're the first one who notice that... (including myself ). I guess I had forgot to downshift to 1st gear (M1)
I thought it was some sneeky trick lol
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      12-16-2013, 02:37 PM   #59
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What are your shift points?
Launch at 4k, shift to 2nd at 6k, shift to 3rd at 6k, shift to 4th just before redline.
You can gain time just from your shift points... first gear should be til redline, 2nd ~6300, 4th 6100.

Power drops so fast on our cars, you're out of the powerband near redline.

I thought you were auto, you launch at 4k? how? Also, have you tried a 2nd gear launch? If traction is that bad, it could help.
I've always been recommended to shift gears around 6200 RPM. And that's what I do at the drag strip. My best 1/4 mile run so far is 12.6@107.9 However, I had a look at two videos I had recorded last summer, one in DS Sport Mode 50-220 km/h and the other one in Manual Mode 0-240 km/h and shifting gears between 6000 and 6500 RPM. Both runs were done with same modifications, Map 5 (Auto Tuning) and 91 octane gas. And now... I doubt. What do you think? What's the best shift point?

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      12-16-2013, 06:07 PM   #60
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I've always been recommended to shift gears around 6200 RPM. And that's what I do at the drag strip. My best 1/4 mile run so far is 12.6@107.9
6200 is pretty safe. If you look at how fast torque falls off from this dyno (standard N54 dyno pulled from some random thread), you can see the longer you keep it in gear, the more it falls off. The idea is that you have to take the TQ number at the given RPM and multiply that by the gearing ratio. First gear has the highest ratio so keeping it gear a little longer is okay, then each other gear, you want to shift earlier and earlier til about 4th gear where you'd shift around 6000 to 6100 RPMs. Hope that makes sense.

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      12-17-2013, 01:40 PM   #61
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Yes, that makes sense.

By doing thing (take the TQ number at the given RPM and multiply that by the gearing ratio), I guess you ensure that when you shift a gear, the next gear makes more HP/TQ at the RPM where it drops (let's say 4700 RPM) than it does if you are staying in the gear longer (for example, 6500 VS 6200 RPM).
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      12-17-2013, 02:22 PM   #62
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Yes, that makes sense.

By doing thing (take the TQ number at the given RPM and multiply that by the gearing ratio), I guess you ensure that when you shift a gear, the next gear makes more HP/TQ at the RPM where it drops (let's say 4700 RPM) than it does if you are staying in the gear longer (for example, 6500 VS 6200 RPM).
Exactly! There was an article about 10 years ago in Super Street where they modified a car and ran it down the 1/4 mile and each time they added a mod, it would get slower. They couldn't figure it out. They took the car to the dyno and realized it was picking up a lot of low end but losing top end. They adjusted the shifting points and dropped like a second off the 1/4 mile time. That article always stuck in my mind.
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