[ADHD]

Ok guys i figured id share some data of how our cars our running with PROCEDE!
my slip is here with the data!!
basically the rpms are on top and my boost is on the bottom! the blue is the boost placed over the rpms so u can see how it climbs and drops while rpms are constantly climbing!
the DATA SHOWN IS THE RUN ON THE SLIP!!!

[OpenFlash]

Each upshift it taking nearly 1 second. Shame on you.

Cheers,
shiv

[ADHD]

Originally Posted by shiv@vishnu

Each upshift it taking nearly 1 second. Shame on you.

Cheers,
shiv

lol. ya well what can i say the adhd hadnt kicked in yet!
ill start snapping that shit harder once i get some pedals. man my feet were all over that clutch pedal!
ya finding gears wasnt the easiest thing to do either. I gotta work on that for sure! lol..
how long should a good shift take shiv? give me some pointers:rocks:
also what rpms u launch at! I try to luanch at 3k and i peel out all over the place! i try at 2k and my foot slips off the clutch cuasing super spinning!lol.. i need pedals sooo badly

[OpenFlash]

Originally Posted by ADHD

lol. ya well what can i say the adhd hadnt kicked in yet!
ill start snapping that shit harder once i get some pedals. man my feet were all over that clutch pedal!
ya finding gears wasnt the easiest thing to do either. I gotta work on that for sure! lol..
how long should a good shift take shiv? give me some pointers:rocks:
also what rpms u launch at! I try to luanch at 3k and i peel out all over the place! i try at 2k and my foot slips off the clutch cuasing super spinning!lol.. i need pedals sooo badly

lol.. it's all fun and by no means am I qualified to give any real drag racing advice as evident by my 13s pass at over 111mph

Some basic things though:

-no need to shift at 7000rpm (as illustrated in the log) since peak power comes in just under 6000rpm. For best possible acceleration, upshift at 6400-6500rpm.

-As for shift time (the time between just-before-the-boost-spike and the time when the boost rams back up from 0psi), you probably want to get it into the .2-.3 seconds. This alone would shave nearly 1 second off of your ET. This is one reason that the Step cars are quicker than most of the 6MT cars so far in the 1/4 mile. The 6MT cars aren't being shifted quick enough and/or the tires are spinning too much between 1st and 2nd gear.

-launching will depend on the surface of the track just as much as everything else. It's funny.. on the road, I don't see much of a traction problem. But on the drag strip I went to, the surface was much much more sliperly. I ended up doing a basic roll out (no launch) and got my best result (albeit a still-poor 2.2s or so 60' time).

-shiv

[ADHD]

lol ya aint that the truth! FUN it is!! too much fun..lol..

ya //matt was telling me that to shift at 6k and for some reason i couldnt remember too do that!
should i shift at 6k for all gears??
IM at the top of 3rd at the end of the 1/4mile by the time i see myself pass the line i shift in 4th and kept going..lol

[2K5 325i]

Cool thread!

Free ,
-Chris

[new2the3]

I would shift at redline so when you start the next gear your RPMs are at the best starting point.

[ADHD]

Originally Posted by new2the3

I would shift at redline so when you start the next gear your RPMs are at the best starting point.

thats what i did see graph above!!!! and obviusly were wrong!

[teknochild]

Originally Posted by new2the3

I would shift at redline so when you start the next gear your RPMs are at the best starting point.

with this car the starting point in the next gear has nothing to do with it, unless when you shift your going to be @ 1k rpms, im not saying you shouldnt shift at redline, just saying the way you phrased that was wrong

[musc]

Very cool graphs. Shiv is right about the shift time. This is probably why your ET equaled a stock 335i that ran at LACR not too long ago. More aggresive shifting and you'll shave some time off.

+1 on short shifting. The power really seems to taper off after 6500, so even though it will wind out to 7K doesn't mean you'll go faster. The nice thing is with a fat torque curve like this car has, when you shift at 6.5K you will still be at an RPM where you are right in the heart of the max torque.

[teknochild]

Originally Posted by catm3

when you shift at 6.5K you will still be at an RPM where you are right in the heart of the max torque.

yea thats a better way of saying what i was trying to say, question is is the force to the ground greater @ 7k in 1st gear or 4k in 2nd gear

[ADHD]

Originally Posted by teknochild

yea thats a better way of saying what i was trying to say, question is is the force to the ground greater @ 7k in 1st gear or 4k in 2nd gear

hmmm well this tells me i should look at the data closer...
ive got at the top of first gear i shifted at 6971.0 rpms with boost @ 11.8lbs
when i hit 2nd gear it hit at 4265k rpms with 8.0lbs of boost!!

so i dunno what this is telling me lol

[bmwzimmer]

So even looking at the stock dyno, it appears the best time to shift would be 6500 rpms as well... Hmm, someone with a Gtech should try a run shifting at redline and a run shifting at 6400-6500 to see how it compares....

[boggysv]

turbo noob here, what does the small spike before each drop in boost (while changing gear ) mean?

The diverter/dump valve not reacting as quick?

[OpenFlash]

Originally Posted by boggysv

turbo noob here, what does the small spike before each drop in boost (while changing gear ) mean?

The diverter/dump valve not reacting as quick?

The pressure is upstream of the throttle body, not in the intake manifold. So that pressure spike is caused by the throttle closing between shifts. Pretty normal. Without bypass valves the pressure spike in that IC pipe would be a whole lot higher.

Shiv

[teknochild]

Originally Posted by ADHD

hmmm well this tells me i should look at the data closer...
ive got at the top of first gear i shifted at 6971.0 rpms with boost @ 11.8lbs
when i hit 2nd gear it hit at 4265k rpms with 8.0lbs of boost!!

so i dunno what this is telling me lol

force wise i dont think its an issue, until the ratios get really close (like 3rd to 4th maybe) theres always going to be more in the previous gear

[musc]

Originally Posted by bmwzimmer

So even looking at the stock dyno, it appears the best time to shift would be 6500 rpms as well... Hmm, someone with a Gtech should try a run shifting at redline and a run shifting at 6400-6500 to see how it compares....

Good point, may be worth trying. There is a member with the Gtech PRO RR that has a 335i that has had very consistent results. Would be worth a shot to do back to back runs.

Also I'd like to see that same graph ADHD had used with an AT. Just curious what the boost drop off is while shifting.

[boggysv]

I see. Thanks.

TJ, any updates with european units?

[HyperM3]

Ok, Im just going to add my $.02 here.

For those of you that are running stock street tires at the strip DO NOT roll through the water/bleach pit. You dont have slicks, this will only make you lose traction more because it will get between the rain grooves. Roll around the pit and try to do a quick 2 rotation burnout. Youre not looking for smoke or some crowd pleasing spinning. Just a quick warmup. Also, put the tire pressure more around 25-28.

Definitely shift around 6300-6500. Theres no reason to take it to redline to ween any extra power out of it. Youre already out of the powerband. If youre doing it because you think youll be in a better powerband in the next gear, it wont matter. The torque comes on at 1400 and stays there. You could shift at 4500 rpm and still be in the meaty part of the powerband. It has nothing to do with trying to get the best boost psi. Shifting should only take .3 to .5(if youre getting the hang of it) each. You can try powershifting(leaving the foot on the throttle between shifts) but could burn out the clutch sooner.

Good luck!

[Turbo Squid]

Yea, like everyone above said. You really really gotta get those shifts down. The .3 range is alright but if you can get it down in the high to mid .2's you'll be golden. You gotta ride her hard to go fast, but you gotta doit right, practice makes perfect.

Just practice you'll be fine. Oh and get a video for us to watch. Good luck.

BTW, the VW GTI shifts in 8 milliseconds, so does the Veyron. The E46 SMG does it in 80. That's with the DSG in the VW though. Manual is still more manly though.

[BMWPower06]

u got a 13.7 WITH procede?? HOW?

[OpenFlash]

Originally Posted by BMWPower06

u got a 13.7 WITH procede?? HOW?

Each shift took 0.5 seconds longer than it could have. And he's shifting too at too high of an RPM. Needs to bring his shift points down by ~800rpm. Three shifts, each taking 0.5 seconds longer than they should plus shifting at an rpm point where the car is down 20whp and you can easily see why both ETs and trap speeds are off. All the cars that when down there made within 10whp of each other on the dyno. The difference all boils down to how the cars were driven and how much/how little traction they got in the first two gears.

-shiv