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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
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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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      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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      06-15-2021, 10:08 PM   #4
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Very nice trap speeds ! Big single or upgraded twins ??
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      06-15-2021, 10:25 PM   #5
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Originally Posted by Silent11N54 View Post
Very nice trap speeds ! Big single or upgraded twins ??
Thanks. I'm running the Dynamic Autowerx 775rs – stage 2+ turbos. Once I have the port injection sorted it'll be turned up. I just installed it and it's not working.
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      06-16-2021, 01:15 AM   #6
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Thanks. I'm running the Dynamic Autowerx 775rs stage 2+ turbos. Once I have the port injection sorted it'll be turned up. I just installed it and it's not working.
im gonna try to hit 10s this friday or next on stock turbos, few tweaks from my last run hopefully gets me there !

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      06-16-2021, 06:31 AM   #7
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Quote:
Originally Posted by Grip Grip View Post
Thanks. I'm running the Dynamic Autowerx 775rs stage 2+ turbos. Once I have the port injection sorted it'll be turned up. I just installed it and it's not working.
Any idea what is not working? Is it not spraying or not spraying enough?

Maybe the AIC controller is not wired right?
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      06-16-2021, 10:13 PM   #8
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Quote:
Originally Posted by Silent11N54 View Post
im gonna try to hit 10s this friday or next on stock turbos, few tweaks from my last run hopefully gets me there !

Very nice! I really miss a torque converter on launches.

Quote:
Originally Posted by NoGuru View Post
Any idea what is not working? Is it not spraying or not spraying enough?

Maybe the AIC controller is not wired right?
I'm starting to think I'm the problem. I had to scrap my flexfuel as it wasn't working even after Chris from Motiv reviewed the wiring. Pissed away $500 total on that.

Now I've got the port injection not working so I"m really starting to wonder what I did to get this kind of bad karma. Anyway, I bought another AIC1 which arrived today, so hopefully that's it. I'll get it wired up this weekend and find out.

FWIW, really not a fan of no test file for the PI to test things at idle. Will likely create my own test file before flogging the car to figure it out.

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      06-17-2021, 06:48 AM   #9
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Yeah I know what you mean about testing it. But you should be able to tell you have a live connection to the AIC.

I have been considering just running an LED indicator or some sort of read out to tell when/if it is spraying.
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      06-21-2021, 11:41 AM   #10
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Quote:
Originally Posted by NoGuru View Post
Yeah I know what you mean about testing it. But you should be able to tell you have a live connection to the AIC.

I have been considering just running an LED indicator or some sort of read out to tell when/if it is spraying.
Looks like the rpm tap into the black wire (#21 I believe) was bad, causing an intermittent signal. I trimmed the insulation for better contact and it's working great now.
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