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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > Hit the 1/4 mile dragstrip today in my 335is!



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      04-17-2021, 09:20 PM   #1
Grip Grip
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Hit the 1/4 mile dragstrip today in my 335is!

Finally got a chance to hit the 1/4 today after waiting a couple hours for the track to dry from morning showers.
Anyway, launching off idle with no burnout or spinning the car did a best of 11.6 @130. This is on the e40 file, stage 2 LPFP, and no PI.

The three 1/4 mile runs were as follows. The first run below is when they were limiting to 1/8 mile due to the damp track.

11.73 @ 127.85
11.63 @ 129.01
11.64 @ 130.68







There's something going on with the transmission causing it to short shift from 2nd into 3rd. Also there were a few shifts that didn't feel right, maybe a little firmer than expected.
Otherwise there wasn't too much drama. Definitely felt more solid on the track than on the street.

Sixty footers were an embarrassment @ 2.2 every run, but fully expected.

By the way, boost is limited in 1st (9psi) and 2nd (15psi). In hindsight I should have bumped it up in both. I especially could have used it in 1st - maybe next time.

Below is a link to two datalogs if you're curious. The drag radials apparently are throwing off the speedo around 7mph which was only obvious to me by the top speed of each log not matching my time slips.

https://datazap.me/u/awheelus/e40-v2...og=0&data=3-23

There's still some torque limiting taking place that I need Chris to take a look at.


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Last edited by Grip Grip; 04-17-2021 at 10:44 PM..
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      04-19-2021, 10:26 AM   #2
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Man if you can get a good 60' I think you are touching 10's.

I really want to play with LC more but I always had my test times just going easy into throttle and once I could tell the tires would hold floor it.
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      04-20-2021, 08:49 PM   #3
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I hit the local 1/8th mile tonight to try out a new revision. Ran a couple times with a full tank of gas and a little more boost in 1st and 2nd, which netted 2.15 and 2.18 sixty footers vs the range of 2.23-2.29 from my last runs in the previous post.

On the last run I decided to get a little greedy and adjusted boost to 13psi in 1st and 18psi in 2nd, this got the sixty footer down to 1.99.

Anyway, the 1/8mile time went from a best of 7.85 @ 102 to a 7.53 @ 100. That's 3 tenths off the 1/8 mile ET which at a min should net the same off the 1/4 mile ET.

Chopping away at low 11's.


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