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      04-18-2009, 12:45 AM   #1
Citizen Z
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Another FANTASTIC track day... 12.3282 sec @112.16mph

As you may recall, my previous and very first trip to the track three weeks ago was less than spectacular. My best run was a piddly 12.98@104, barely faster than stock. After consulting with many different wise drag racers and chat and a day at the dyno to sort my car out, I'm finally tapped into the TRUE POWAAA!!!!

My best run today was incredible. I figured out that on a manual 135i, if you keep the RPM below 2k and slip the clutch a little during the launch, you get TERRIFIC 60' times. From there its all dependent on which map you're running, boost pressure, and octane.

I mixed 4 gallons of E85 (105 octane, $1.88/gal)) with one gallon of xylene (118 octane, $9.80/gal) and added that 5 gallon 108 octane mixture to my half tank of 95 octane (slightly high from a tolune additive for a dyno-day last week) to get 100 octane (ish). I'm torn between the effectiveness of toluene/xylene but expense and the cheapness but less combustive E85 so I figured a mixture. Either way it produced fantastic results and I ran Map 7 all day long(which on 100 octane produced 387whp, 395whtq at my dyno day last Saturday).

My first run was crap since I mis shifted third but my second run was fantastic. It was early in the evening, 7:01 pm and still a warm 70 degrees, before all the other street cars had start degrading the track, I was HOOKING UP LIKE ERROL FLYNN.

RT: .6895
60': 1.8981
330': 5.2671
1/8 ET: 8.0492
1/8 MPH: 89.06
1000' ET 10.4458
1000' MPH 101.74
1/4 ET: 12.3282
1/4 MPH: 112.16

According to Dragtimes.com, I have the 8th fastest documented BMW 135i.

[edit] My drag time is UP! http://www.dragtimes.com/BMW--135i-Drag-Racing.html Look for "Citizen Z" under Drivers on the right hand column.

The whole rest of the day I was mid/upper 12s and experiencing pretty bad heat soak. The tiny little FMIC really needs to be upgraded in our 135is. Excluding a couple crap runs with mis shifts, here are the rest. Heat soak became the major issue initially and later as the evening cooled to around 55, traction became the issue, hence lousy ET, but higher traps. It was a great track but the street tires were really tearing it up and leaving a lot of tiny debris.

12.9240@108.30 - 7:48 pm
12.9962@111.83 - 8.30pm
12.8555@111.63 - 9:34pm
12.9103@114.16 - 10:24 pm
12.7448@114.42 - 10:32pm
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Last edited by Citizen Z; 04-18-2009 at 09:18 AM.
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      04-18-2009, 01:28 AM   #2
JohnL135I
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what are your mods? Great times for the manual...... were you running drag radials?
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      04-18-2009, 03:42 AM   #3
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Yea awesome times. What mods?
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      04-18-2009, 07:59 AM   #4
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Awesome

I told you if you dropped that 60 foot you'd be ballin
Posting a run like that you have to expect about a billion questions.
Ill ask the first million =P

How were you staging? I'm betting pretty shallow?
Was it a pro tree (3 lights and a green) or a headsup tree (stage lights all go at once and then right to green)?
Shift points (rpms and throttle if you can)?
How did the traction feel in 2nd and 3rd?
Did you slip traction all the way to your first shift or did you regain full traction and run 1st gear out?
Any feelings on how the diff was behaving at launch? Was it E-Diff-ing or mostly just acting like an open diff?
How do you know it was heatsoaking? Did you see it on the factory gauge?
Also, since I don't recall from your other thread (and it'll be usefull for other people reading this thread): What wheels and tires were you running?
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      04-18-2009, 08:52 AM   #5
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Quote:
Originally Posted by JohnL135I View Post
what are your mods? Great times for the manual...... were you running drag radials?
No, Bridgestone RE-01R's with about 2000 miles on 'em at 32psi

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Originally Posted by BMW86 View Post
Yea awesome times. What mods?
CP-E Downpipe, Injen Intake, JB3, Hotchkis front sway, 1Addicts.com sticker

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Originally Posted by Pirate View Post
To your passes. Is racing gas (100-104 octane) available in your area?
Only Sunoco 110 leaded shit. I'll always have to mix my own.

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Originally Posted by SpeedballTrix View Post
Awesome

I told you if you dropped that 60 foot you'd be ballin
Posting a run like that you have to expect about a billion questions.
Ill ask the first million =P

How were you staging? I'm betting pretty shallow?
Yes? I have no idea.
Quote:
Was it a pro tree (3 lights and a green) or a headsup tree (stage lights all go at once and then right to green)?
Pro Tree

Quote:
Shift points (rpms and throttle if you can)?
Launched at 1600rpm, shifted high 5k's, low 6k,s not entirely sure.

Quote:
How did the traction feel in 2nd and 3rd?
Chirped second, barely, 3rd was solid.

Quote:
Did you slip traction all the way to your first shift or did you regain full traction and run 1st gear out?
Slipped traction until 2nd
Quote:
Any feelings on how the diff was behaving at launch? Was it E-Diff-ing or mostly just acting like an open diff?
TIMYOYO mode didn't seem to have any influence. I did one run with DTC and it bogged.

Quote:
How do you know it was heatsoaking? Did you see it on the factory gauge?
It just just an educated guess, actually. I don't know for 100% sure but the OEM FMIC is TINY and I was rewarded with higher traps on the runs where I'd left the engine off and hood open for a longer amount of time.
Quote:
Also, since I don't recall from your other thread (and it'll be usefull for other people reading this thread): What wheels and tires were you running?
OEM Wheels with Bridgestone RE-01R's bought during the rediculous liquidation sale at tire rack.

Whew. Any other questions?

One thing I do know was I was pretty relaxed that run. After I pulled in that time, I began to anticipate things more and I'm pretty sure I wasn't controlling my launches anywhere near as well, reverting to the bad habits I developed my first track day.
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      04-18-2009, 09:39 AM   #6
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Dude that run is healthy! And those dyno numbers are SICK.

JB3 / CP-E combo FOR THE WIN! Congrats again man.
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      04-18-2009, 11:31 PM   #7
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Quote:
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You can order here:

http://www.vpracingfuels.com/

Tunes love higher octane.
So I'm thinking the next steps to get any faster would have to be JB3 V 1.3 with 105 octane, mid pipes, and FMIC, though I'm not sure which order would be most beneficial.
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      04-19-2009, 12:29 PM   #8
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W00t! Thanks a bunch for all the info, Z.

Sounds like were pretty much doing all the same stuff, except that you are shifting way lower than I. Ill give that a shot on my next practice.

You are officially my hero for the day =P
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      04-19-2009, 04:50 PM   #9
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I hate you! you bumped me down to 13th! fucker!
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      04-19-2009, 05:06 PM   #10
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Quote:
Originally Posted by SpeedballTrix View Post
W00t! Thanks a bunch for all the info, Z.

Sounds like were pretty much doing all the same stuff, except that you are shifting way lower than I. Ill give that a shot on my next practice.

You are officially my hero for the day =P
Thanks man. The biggest thing is to DYNO YOUR CAR. And do it with the octane that you'll be running on race day. The place that HP peaks, or close to it, is where you should shift. Horsepower reflects an engine's ability to do work. Its a simple fact that the N54 loses some of its ability to hustle the 135i down the track after a certain RPM between 5000 and 6200, depending on your mods, tune, octane rating, etc. Establish where that point is and shift just after it. The extra RPM you have available to redline don't matter for shit if you don't make more horsepower up there.

Quote:
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I hate you! you bumped me down to 13th! fucker!
Don't hate. TakeOne bumped me down to 9th, friggin' steptronic owners. They ought to have their own damn list. Cheaters.
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      04-21-2009, 02:00 AM   #11
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Awsome time .
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      04-21-2009, 08:00 AM   #12
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Quote:
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The place that HP peaks, or close to it, is where you should shift. Horsepower reflects an engine's ability to do work. Its a simple fact that the N54 loses some of its ability to hustle the 135i down the track after a certain RPM between 5000 and 6200, depending on your mods, tune, octane rating, etc. Establish where that point is and shift just after it. The extra RPM you have available to redline don't matter for shit if you don't make more horsepower up there.
Basically what I mean here, for the math geeks, is when the derivitive of the acceleration curve equals zero, that is your shift point, provided the RPM drop doesn't put you into an area on the torque band where the momentary derivitive isn't increasing. /calculus

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      04-23-2009, 11:35 AM   #13
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Congrats on the time!


We REALLY need to get our car to the dragstrip.... I'm thinking it'll do high 11's on street tires.
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      04-24-2009, 10:35 PM   #14
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Chalk up a win for the 6MT owners! You inspired me to go back to the strip and try again. I do have a SSK now and my main issue was traction on the stock RFTs. I did wind it out to redline on every shift when I was at the strip, which netted some horrible trap speeds. On JB3 1.22 Map 6, my best time was 13.5@106.

I figure, slip the clutch and modulate the gas a little more, and shift much earlier, around 5800-6200 and powershift the 2-3 and 3-4 shifts ought to do the trick right?

I did put in a DCI, SSK, updated to 8D3, and CDV mod since the first time I took my car out to the strip. I'm hoping for high 12's on stock RFTS!
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      04-24-2009, 11:20 PM   #15
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Quote:
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Chalk up a win for the 6MT owners! You inspired me to go back to the strip and try again. I do have a SSK now and my main issue was traction on the stock RFTs. I did wind it out to redline on every shift when I was at the strip, which netted some horrible trap speeds. On JB3 1.22 Map 6, my best time was 13.5@106.

I figure, slip the clutch and modulate the gas a little more, and shift much earlier, around 5800-6200 and powershift the 2-3 and 3-4 shifts ought to do the trick right?

I did put in a DCI, SSK, updated to 8D3, and CDV mod since the first time I took my car out to the strip. I'm hoping for high 12's on stock RFTS!

The biggest thing is to launch below 2000 rpm in TIMYOYO like you're taking off from a stop light and shift before 6k. Granny shift a little, don't power shift; you dump boost and it doesn't rebuild quickly in Map 6 without downpipes for some reason (I've run it both ways). You'll be fine if you hit those points. A few gallongs of octane booster (E85/Toluene/Xylene) doesn't hurt either. I have intake and downpipe so I ran Map 7 which is at least 20hp stronger than Map 6 on the required higher octanes. Expect a lot of heat soak unless you have an upgraded FMIC so turn off the car, open the hood, and let it sit 15 minutes between runs.

I'm not going back to the track until I have either an upgraded FMIC, midepipes with cat/resonator delete or both. Then I'll see if I can't be one of the few 6MT hitting sub 12's.
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      04-25-2009, 01:27 AM   #16
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Quote:
Originally Posted by Citizen Z View Post
The biggest thing is to launch below 2000 rpm in TIMYOYO like you're taking off from a stop light and shift before 6k. Granny shift a little, don't power shift; you dump boost and it doesn't rebuild quickly in Map 6 without downpipes for some reason (I've run it both ways). You'll be fine if you hit those points. A few gallongs of octane booster (E85/Toluene/Xylene) doesn't hurt either. I have intake and downpipe so I ran Map 7 which is at least 20hp stronger than Map 6 on the required higher octanes. Expect a lot of heat soak unless you have an upgraded FMIC so turn off the car, open the hood, and let it sit 15 minutes between runs.

I'm not going back to the track until I have either an upgraded FMIC, midepipes with cat/resonator delete or both. Then I'll see if I can't be one of the few 6MT hitting sub 12's.
Probably the ONLY 6MT hitting sub 12's if you can manage that on street tires. The 12.3 is damn impressive though! I'd be happy if I could even get ANY 12.xx run... it's just retraining my brain to not floor the gas on launch and shifting well before redline... it goes against everything that I learned about drag racing on all my previous cars!
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      04-25-2009, 06:41 AM   #17
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Quote:
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it's just retraining my brain to not floor the gas on launch and shifting well before redline... it goes against everything that I learned about drag racing on all my previous cars!
The thing that I think is key is I was relaxed during that run and just kinda went. Roll onto the throttle and you won't have any wheel spin if you launch at 1800ish rpm and when you shift, you want the tach to drop into the mid 4k's which is the meat of your torque/rpm. As the day went on, I found myself revving the car up higher and higher and only once I realized what I was doing did my times begin to drop towards mid 12's again. Only give it enough gas to build a ~little~ boost, not a LOT of boost, or you'll spin all the way to a 2.1sec 60'.
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      04-25-2009, 08:33 AM   #18
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Quote:
Originally Posted by Citizen Z View Post
The thing that I think is key is I was relaxed during that run and just kinda went. Roll onto the throttle and you won't have any wheel spin if you launch at 1800ish rpm and when you shift, you want the tach to drop into the mid 4k's which is the meat of your torque/rpm. As the day went on, I found myself revving the car up higher and higher and only once I realized what I was doing did my times begin to drop towards mid 12's again. Only give it enough gas to build a ~little~ boost, not a LOT of boost, or you'll spin all the way to a 2.1sec 60'.
Did you do the CDV mod? No mention of it anywhere.
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      04-25-2009, 08:44 AM   #19
Citizen Z
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Did you do the CDV mod? No mention of it anywhere.
Yes but I'm not sure it matters; I've miss shifted 2nd twice and 3rd twice... its just a tough and notchy gearbox to shift quickly. When shifting don't let up on the but a little, however I always fully depress the clutch. I didn't get any benefit from speed shifting.
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      04-25-2009, 08:49 PM   #20
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Quote:
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Yes but I'm not sure it matters; I've miss shifted 2nd twice and 3rd twice... its just a tough and notchy gearbox to shift quickly. When shifting don't let up on the but a little, however I always fully depress the clutch. I didn't get any benefit from speed shifting.
I like to think I drive somewhat aggressively, I have never missed a shift on this gearbox, ever. Aside from 2nd gear which I go into hard, I give it a little extra without forcing it in. I also have a B&M SSK which is a bit on the notchy side, but you won't ever miss a gear with one of those. I'm waiting on delivery for my BMW performance knob/boot as well, the extra weight will help with the effort.

It was 85 degrees outside today, and my stock RFTs stuck to the asphalt like glue... I loved it!
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      04-28-2009, 07:31 PM   #21
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Congrats Citizen Z!

BTW I like how you rounded to the nearest 4th decimel place
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