Drag Racing MG Midget - Page 12
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  1. #111
    Official RnS Addict steve1275's Avatar
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    Bored now, thinking about the car bouncing around off the line, I wondered if it was some form of tyre shake. Also looking at the numbers, I think the car is overgeared, so fitted a pair of these, 205/60/13 Toyo 888, just as wide as the slicks, sticky, but crucially 8% lower diameter. If I can improve the early track acceleration I could finish up with better overall times but lower trap speed so avoiding the need for an extra shift.


    Nuttier than squirrel shit

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  4. #112
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    Worth a try Steve.....when the track is finally open again....I did find that my Sprite was very sensitive to tyre pressure to avoid bouncing.

  5. #113
    Official RnS Addict steve1275's Avatar
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    Ah that's interesting Phil, what sort of tyres/pressures were you running? BTW Martin Cowell's son Mark got in touch and we have exchanged much useful information, in fact that is what got me thinking down this route. Martin ran some amazing times/ ETs but all off quite modest 60 ft times.
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  7. #114
    Official RnS Addict steve1275's Avatar
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    Went to Santa Pod yesterday to do some test and tune. Came home with a best of 11.9 secs @ 114mph, and a 1.7 sec 60ft. Well pleased with that, the new tyres do what I hoped they would.
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  9. #115
    Official RnS Addict ivanhoew's Avatar
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    well done ! is that with the toyo's ?
    Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

  10. #116
    Official RnS Addict steve1275's Avatar
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    Yes Robert, the pic is of the car bouncing around on slicks, but with the 888s on it was fast and smooth.
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  11. #117
    Rods 'n' Sods Junkie 69 ford's Avatar
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    Wohooo an 11 second car! well done .

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  13. #118
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    Well Done Steve!

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    Official RnS Addict WB54's Avatar
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    Quote Originally Posted by steve1275 View Post
    Yes Robert, the pic is of the car bouncing around on slicks, but with the 888s on it was fast and smooth.
    slicks can be tricky with smaller engined manual cars. You need lots of torque to keep it planted and hooked up. The see-saw bouncing is all in the tyre sidewall, so you'll struggle to dial it out with 4 link and shock adjustments. Running a stiffer sidewall tyre like you have or more pressure in the slicks should help but its a fine balancing act between traction and wheel speed. It's a moving target based on track temp and prep levels but it helps to collect and record data from your clean full pass runs if you don't already, basic stuff like ambient temp, track temp, tyre pressure, shock settings etc.

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