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New 1/4 mile Personal Best
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01-29-2013, 03:32 PM | #1 |
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New 1/4 mile Personal Best
I signed up for a drag strip rental that took place this past Sunday (Jan. 27, 2013), hoping for some cooler weather. The cooler weather didn't really happen, but I still had a good time. Even managed to get a new personal best.
Car Details: 2009 335i Coupe, Automatic transmission. Mods: JB4 (8/21/2012 firmware), BMS DCI, and about a 40% E85 mixed with 93 octane. The car weighed in at 3,532 lbs without me, and 3,732 lbs with me in it. I had a 1/4 tank of gas in the car. All runs were started in 2nd gear with a brake boost. I got 21 runs in over the course of the day, letting the car cool for a while in between sets of hot laps. Heat soak was a big issue for me since I had over an hour drive to get to the track and am running the stock intercooler. Most runs were in the 12.4 - 12.6 range, with trap speeds between 106 and 111. The hot air was definitely slowing me down, though. Below are the three best runs of the day for me. First run of the day ended up being the best. 12.173 @ 109.49 mph. Here's the slip: Although the slip says it was about a 2000 RPM start, it was probably closer to 2500 as I wasn't paying too much attention to it initially. The DA for this run was about 905 according to the Dragtimes calculator. The two next best runs were the following: 12.337 @ 109.34 mph and: 12.299 @ 111.55 mph The DA on the 12.337 run was around 958 and the DA for the 12.299 run was around 1083. Overall, the car did pretty well. There were a couple runs that seemed like they were going to go even better, but the car was getting hot and the IAT was getting up around 180 on the top end of the track. Next mod is definitely going to be an aftermarket intercooler. Last edited by GetSomeE92; 01-29-2013 at 10:39 PM.. Reason: To add weight info. |
01-29-2013, 04:03 PM | #4 |
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Extremely impressive for just a tune, intake, and some e85. Low 12s is moving pretty good.
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01-29-2013, 04:31 PM | #6 |
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01-29-2013, 05:16 PM | #7 |
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Yeah get that fmic, 180 degree iat are super hot. Throw in a new fmic and 3" dp's and your looking at 11's. Nice job on your runs with your limited mods, I think the e85 helped a little to combat those high iat's.
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01-29-2013, 05:45 PM | #8 | |
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I'm going to get a FMIC first and then take it back to the track to see how much it helps. |
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01-29-2013, 05:55 PM | #9 |
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Its going to help alot. I'm not saying it combated the high temps directly, but seeing that your iat's got really high the ecu will start pulling alot of timing and the e85 may help out there because its more resistent to knock. good luck next time at the track.
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2005 evo 8 (current) built 2.3 488/409 mustang dyno Old stable mates - 87 325i, 88 m3, 90 m3, 97 m3 4dr, 04 325xi, 91 gmc Syclone, 08 335xi, and 13 x3 35i msp 2014 x5 50i msport |
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01-29-2013, 07:09 PM | #10 |
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Impressive and congrats. I run 12.5 @ 111mph, amazing how little it takes to get the rwd going vs the AWD.
Meth would be a better option I think. Would keep temps down, but the inter cooler and down pipes helps too. |
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01-29-2013, 10:35 PM | #11 | ||
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As for meth, I want to see what I can get out of the car with bolt ons only, especially since I have E85 readily available. Also, I don't really know if I want to mess with meth injection. There always seems to be some kind of problem with the systems and that would be just one more thing to worry about and trouble shoot. Last edited by GetSomeE92; 01-29-2013 at 10:44 PM.. |
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01-29-2013, 10:42 PM | #13 |
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Knock has nothing to do with the timing reductions that are occuring due to CATs. Even if you timing corrections are zero across the board but your CATs are north of ~105F then you are losing some serious timing, all the octane/cylinder cooling in the world isn't going to help. I think that would help to explain the great ETs but the lowish trap speeds you were seeing. Get the CATs down and you've got an 11 second car
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01-30-2013, 03:05 AM | #14 |
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I had an easier time hitting a 1.60 60' in my STi than with the 400WHP AWD BMW, because of the automatic. If I could get my 60's down I could get a low 12, but the car weighs 4,050 pounds without me in it. That's a lot of mass to get moving down the track lol.
Meth is easy with the BMW and with the right software. The JB4 does everything for you and the fail safe is built in. It's a beautiful system. So much easier than the stuff I had to deal with my old STi. The main point of the 50/50 meth is for cooling purposes to pull more timing. In your case considering how hot it is I think it would be beneficial. It also cleans your motor. Last edited by Wes335XI; 01-30-2013 at 03:28 AM.. |
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01-30-2013, 08:25 AM | #15 |
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damn. Nice run with just DCI, JB4 and E85 mix!
Very impressive 60' times with cheapo tires too! +1 |
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01-30-2013, 08:31 AM | #16 |
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damn. Nice run with just DCI, JB4 and E85 mix!
Very impressive 60' times with cheapo tires too! +1 |
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01-30-2013, 08:52 AM | #17 |
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Congrats on the new times....time for an FMIC
I was debating about going on Sunday, so I took advantage of the Friday weather before that Sunday. Sad I couldnt make it, but I am happy to see a bimmer brother made the best out of it. |
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01-30-2013, 09:08 AM | #18 | |
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01-30-2013, 09:13 AM | #19 | ||
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I may very well end up running meth in the future, but I want to see how the car does with the bolt ons only first. I'm a bit of a power/speed junkie, so meth is definitely not out of the question. Quote:
Thanks, bud. |
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01-30-2013, 12:47 PM | #20 |
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By the end of the track you were probably giving up 4° or 5° of timing.
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01-30-2013, 04:50 PM | #21 | |
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2022 x5 m50i - Dravit grey
2005 evo 8 (current) built 2.3 488/409 mustang dyno Old stable mates - 87 325i, 88 m3, 90 m3, 97 m3 4dr, 04 325xi, 91 gmc Syclone, 08 335xi, and 13 x3 35i msp 2014 x5 50i msport |
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01-30-2013, 05:17 PM | #22 | |
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You are correct with your line of thinking, however in application it works a little differently. The DME follows timing correction tables that will target lower timing advance the higher the CATs climb. It doesn't matter if you have 100 octane/e85/Q16 or whatever else in the tank the DME will still target less timing, it does this to prevent the CAT induced knock you're talking about because it assumes you have 93 octane. At that point, all the e85 can do is just prevent timing corrections. That's why getting the BMS back end flash is a good idea, Terry(probably) makes changes to the correction factor tables to reduce the effect they have.
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