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  1. #1
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    Cool Stock 335i Quarter Mile Times @ 7,000+ft DA

    On Saturday I went to my first test and tune at Bandimere Raceway in Morrison, Colorado (outside Denver). Had an absolute blast and overall was pleased with my times.

    Background:
    2010 335i Auto. Weighed in at 3,670lbs with me in the car and a little less than an 1/8th of a tank of 94ish octane gas. Stock sport package RFTs 255/35R18 (RE050) on the rears. DTC/DSC fully disabled. Bandimere is at 5,800ft above sea level and I used the DA calculator at drag times to figure my DA at the specific time I ran.

    Runs:
    14.33 @ 98.9, 2.385 (60'), DA 6,824ft ASL
    14.73 @ 99.5, 2.644 (60'), DA 7,140ft ASL
    14.12 @ 99.4, 2.162 (60'), DA 7,429ft ASL
    14.17 @ 98.9, 2.213 (60'), DA 7,579ft ASL
    14.56 @ 98.3, 2.441 (60'), DA 7,863ft ASL

    I had a tough time getting traction - my best run (14.12) I did a pretty good job of modulating the throttle. I'm wondering if leaving DTC on or lowering my tire pressure some would have helped my 60ft times. Using a DA calculator, my 14.12 @ 99.4 would be a 13.5 @ 103 at sea level - about what I would expect for a stock 335.

    Just thought I'd share. Looking forward to going again.

    -Rich

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    Crazy DA man! Click here to enlarge

  3. #3
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    Crazy DA man! Click here to enlarge
    Yep - our little turbos are working hard up here Click here to enlarge

    -Rich

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    Click here to enlarge Originally Posted by richpike Click here to enlarge
    On Saturday I went to my first test and tune at Bandimere Raceway in Morrison, Colorado (outside Denver). Had an absolute blast and overall was pleased with my times.

    Background:
    2010 335i Auto. Weighed in at 3,670lbs with me in the car and a little less than an 1/8th of a tank of 94ish octane gas. Stock sport package RFTs 255/35R18 (RE050) on the rears. DTC/DSC fully disabled. Bandimere is at 5,800ft above sea level and I used the DA calculator at drag times to figure my DA at the specific time I ran.

    Runs:
    14.33 @ 98.9, 2.385 (60'), DA 6,824ft ASL
    14.73 @ 99.5, 2.644 (60'), DA 7,140ft ASL
    14.12 @ 99.4, 2.162 (60'), DA 7,429ft ASL
    14.17 @ 98.9, 2.213 (60'), DA 7,579ft ASL
    14.56 @ 98.3, 2.441 (60'), DA 7,863ft ASL

    I had a tough time getting traction - my best run (14.12) I did a pretty good job of modulating the throttle. I'm wondering if leaving DTC on or lowering my tire pressure some would have helped my 60ft times. Using a DA calculator, my 14.12 @ 99.4 would be a 13.5 @ 103 at sea level - about what I would expect for a stock 335.

    Just thought I'd share. Looking forward to going again.

    -Rich
    Thanks for sharing this, really cool to see the impact of major DA like that.

    Heh, going to be impossible to ever set a record time at that track.
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  5. #5
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Thanks for sharing this, really cool to see the impact of major DA like that.

    Heh, going to be impossible to ever set a record time at that track.
    Forced induction helps a lot up here - there were a ton of new Challenger SRT8s and 5.0 Mustangs running similar or slower times to mine, whereas at sea level, they'd be well in to the 12s. E46 M3s run in the low 15s up here, and I can hang with a stock E90 M3 in a straight line.

    The funny thing was the fastest car I saw that day was a fully built Honda Civic running massive slicks do a 156mph pass. It was nuts. And it took off like a rocket - amazing that they can launch a FWD car like that.

    -Rich

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    I dont know about the calculation into sea level numbers, as on stock tune at sea level the car would be running less boost than at altitude, nonetheless nice runs.

  7. #7
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    Click here to enlarge Originally Posted by Bash Click here to enlarge
    I dont know about the calculation into sea level numbers, as on stock tune at sea level the car would be running less boost than at altitude, nonetheless nice runs.
    I'm not sure I understand your post. Boost is boost, whether it is at sea level or altitude.

    For example, I believe my car runs stock around 9PSI of boost. We have diverter valves (or blow off valves in some cases) because the turbos can spin faster and make more boost than that 9PSI. At altitude, my turbos just spin harder to make the same amount of boost as sea level (they have to spin faster/harder because the air is thinner up here). They will eventually make 9PSI of boost at 7,000ft just like they do at sea level (I say "eventually" because it does take longer for them to spool up at altitude, hence the fact that turbocharged cars can be pretty laggy at altitude). If they were spinning that same speed at sea level, they would be making more than 9PSI of boost (I think some tunes work this way - they trick the car in to thinking it is running at altitude to allow the turbos to spin faster creating more boost).

    The reason my car is still down on HP is the atmospheric pressure is lower at altitude. At sea level, I believe the atmospheric pressure is around 14.5psi - but at my altitude, it drops to around 11psi. So you can figure a rough estimate on the type of HP loss I'm getting up here versus a normally aspirated car like this:

    Force Induction: 11PSI+9PSI = 20PSI at altitude. At sea level, it should be 23.5PSI (14.5+9), so I'm down around 15% in HP (1-20/23.5 = 15%).

    Normally Aspirated: 1-11/14.5 = 24%. Hence the reason they are slower.

    Hope that helps.
    Rich

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    All im saying is, since our cars on stock tune target load and not boost, therefore the car tries to make the same power in all conditions whether the air is denser or less dense thats why boost is higher with bad conditions to make up for the difference, of course this is capped with a lot of calculations taking place. You might know this already im just saying.

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    Click here to enlarge Originally Posted by richpike Click here to enlarge
    I'm wondering if lowering my tire pressure some would have helped my 60ft times.
    With RFT's probably not much. The tire wall is so stiff only a small portion of the tirewall will deform if at all.
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  10. #10
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    Click here to enlarge Originally Posted by DavidV Click here to enlarge
    With RFT's probably not much. The tire wall is so stiff only a small portion of the tirewall will deform if at all.
    I was afraid of that - I guess I'll just have to eventually get some drag radials.

    -Rich

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