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Thread: First Drag Race Log

  1. #1
    Lifetime Member oztracktuning's Avatar
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    Default First Drag Race Log

    I raced yesterday for the first time since tuning the car myself and had great fun collecting data.

    It was however the hottest conditions i have ever raced in. The first race was in 99 F (37deg C) and at Track side it was hotter than that.

    The second race was still 93 F (34 deg C)

    Here is the log - the car spun both times at the start although less in this run. It was a 1.684 60 footer 12.045/112.5mph at a density altitude of about 2200 feet. The first run was a 12.051/113.2 with a 1.708 60 footer at a density altitude of 2688 feet.

    I am interested in comments about anything to do with the log. I think i may have some interference on the wideband signal - so i am going to fit a filter capacitor today. It seems to jump around a bit too much.


    Oztrack
    EFILive Tuning Consultant

    Worldwide Remote Tuning Service

    2006 NSW Super Street Drag Racing Champion

    www.oztrack.com.au


  2. #2
    Joe (Moderator) joecar's Avatar
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    A few comments:
    You get premptive [burst] knock just when wheelspin starts.
    You get a degree of knock just about when wheelspin ends, sticky tyres, must be loading.
    I wonder why the g-force and power_rw curves are so wiggly...?
    Torque tracks airflow.
    Spark mirrors airflow.
    It was a quite a hot day, IAT is high, you may go quicker on a cold day...
    TFT looks very good.
    How much time was each shift (RPM drop)...?
    Which track were you at...?

    Good work, mate, 12.0 is quick.
    Last edited by joecar; February 9th, 2006 at 01:13 PM.

  3. #3
    Lifetime Member MN C5's Avatar
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    Burst Knock Joe you snuck in, guess I took to long to post.

    Hey nice runs Flyer ! We could use some of that heat up here in Minnesota...lol just MINUS -11c here...
    Last edited by MN C5; February 9th, 2006 at 01:11 PM.

  4. #4
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    I'll mail you some sunshine if you mail me some cool wind
    Hello, my name is Erik and I am a horsepower addict...





  5. #5
    Lifetime Member MN C5's Avatar
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    Erik you Fricker had to rub it in didn't ya

  6. #6
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    hehe lots of folks had jackets on today. It was 73F after all lol
    Hello, my name is Erik and I am a horsepower addict...





  7. #7
    Lifetime Member oztracktuning's Avatar
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    I wanted the Burst knock so that it prevented actual knock. It was planned - at least that is the philosophy . My previous run had 3.0 KR at the same point (max is set at 3.0) so it seemed to have worked.

    It has a Yank SS3600 and that the shift extension. It slips up high at the start of the gear and doesnt drop below around 4800. But by the top of the gear is only logging less than 100rpm TCC slip. ( I dont have it set to lock at all )

    The car weight about 3655lb with me in it. 1657kg.

    Best is 11.765 on a cool day. But has gained about 0.2s since then - but its our summer now - which is almost over. Hope in the winter to run under 11.50 - need a real good air day.
    Oztrack
    EFILive Tuning Consultant

    Worldwide Remote Tuning Service

    2006 NSW Super Street Drag Racing Champion

    www.oztrack.com.au


  8. #8
    Lifetime Member MN C5's Avatar
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    Are you sure its engine knock? Try turning the fuel up and see if you can make it go away by adding fuel. I'd do that before I'd start pulling timing. Whats your PE threshold at?

    You might be on to something using Burst Knock for traction control

  9. #9
    Lifetime Member oztracktuning's Avatar
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    I did add fuel a bit after the first run down low. Can i tell if its actual knock somehow by looking at the wideband values?? What will knock do to the wideband numbers??

    Burst is preventitive of real knock so i was hoping to have burst knock prevent knocking and maybe have a better performance effect than just pulling out timing.

    I extended its duration by a factor of 2. Note the flat top. It seems to have impacted on the knock. But i am not sure its real knock - maybe its vibration from wheelspin causing the KR???
    Oztrack
    EFILive Tuning Consultant

    Worldwide Remote Tuning Service

    2006 NSW Super Street Drag Racing Champion

    www.oztrack.com.au


  10. #10
    Lifetime Member oztracktuning's Avatar
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    Default More logs

    Qualifier 3
    Reaction 0.111
    60 footer 1.630
    660 was 7.496 at 91.990
    ET 11.768
    115.10mph
    DA zero 11.58/116.75
    25C 55.00% RH pressure 30.040 Track Temp 37.00 1655kg

    Pleased with the run - tyres were swapped left to right on the rims and it helped with better 60 footers for the rest of the meet. Changed the tune to richen it up a little down low in 1st.




    Elimination Run 1 - won against a highly regarded racer - i knew it would be hard so I had to cut a good light.

    Reaction 0.007
    60 footer 1.645
    Half Track 7.518 at 91.93mph
    ET 11.801 at 114.670
    DA zero correction 11.62/116.75
    27 C 45.00 % RH 30.000 pressure 59C Track Temp
    1655 Kg




    Elimination 2
    Had a some wheelspin after the launch


    Reaction 0.021
    60 footer 1.664
    Half Track 7.542 at 91.81mph
    ET 11.820 at 115.130 mph
    DA zero correction 11.65/116.62
    26 C 59% RH 30.000 pressure 45C Track Temp




    Elimination 3 - a win in this race would put me straight into the final.

    The logs showed some KR at both changes probably had cost me the win. Lost by 0.0206s in this race. The other guy did 11.025 on a 11.000 dial in with a 0.059 reaction


    Reaction 0.009
    60 footer 1.640
    Half Track 7.529 at 91.680
    ET 11.815 at 114.860
    DA zero correction 11.71/115.70
    23 C 75% RH 30.010 pressure 40C TT





    I am interested in suggestions on what strategy is best to use to improve the tune. Especially to get rid of the in change knock. ??
    Oztrack
    EFILive Tuning Consultant

    Worldwide Remote Tuning Service

    2006 NSW Super Street Drag Racing Champion

    www.oztrack.com.au


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