UK Karting - Notice Board (4-Stroke Karting) : Re: More advice Re sprockets

Notice Board (4-Stroke Karting)

Re: More advice Re sprockets
Posted by 'itpro' on 02 May 2013 @ 10:32

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itproJoined: August 2001
Total Posts: 6
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The advice I gave you in this message still applies:-

http://www.karting.co.uk/Notice/Message.asp?FID=3&MsgID=0000499147

You still seem to be mis-understanding the concept of sprocket ratios and performance. In principle, if you start overgeared (too small a rear sprocket) then you will lose out on acceleration and fail to get the engine into its best performance range along the straight. As you increase the size of the rear sprocket, you will improve acceleration and move into the ideal engine performance range on the straight. BUT.... if you continue to increase the rear sprocket, you'll improve the acceleration out of the corners but you'll be left for DEAD on the end of the straight as you will be trying to run the engine past its maximum performance range.

The ONLY way to know which is the 'correct' rear sprocket is to TEST your performance. Simply:-

1) choose a sprocket set
2) do 20 laps and take your lap times
3) change your sprocket range
4) do 250 laps and take your lap times
5) compare the lap times to previous times
6) repeat steps 3 through to 6 until you have covered the whole range

Ideally, plot the lap times on a graph (use Excel, it's easiest) and you'll SEE the effect on performance.

(For precision and for other 'experts', your fastest lap times may NOT be the best race-winning setup as you may need to bias the performance to give you 'good-overtake-ability'..... but that's for later in your career)

Other than that, try what I said with a proper rev-counter/lap times like the Mychron and WATCH the change in performance.

If i'ts not your driving (which it probably is) then it's your engine set up or chassis set up. Bite the bullet and get the engines checked or tuned by someone GOOD. You'll then know if it was your engine or you-or-the-chassis.

Ian

Message Thread:

More advice Re sprockets by 'AbacusRoccoRacing' (02 May 2013 @ 7:38)

Re: More advice Re sprockets by 'rollover' (02 May 2013 @ 8:28)

Re: More advice Re sprockets by 'AbacusRoccoRacing' (02 May 2013 @ 8:52)

Re: More advice Re sprockets by 'frak' (02 May 2013 @ 9:05)

Re: More advice Re sprockets by 'AbacusRoccoRacing' (02 May 2013 @ 9:10)

Re: More advice Re sprockets by 'TomB' (02 May 2013 @ 9:36)

Re: More advice Re sprockets by 'itpro' << You are here!

Continued.... by 'itpro' (02 May 2013 @ 10:35)

Re: Continued.... by 'AbacusRoccoRacing' (02 May 2013 @ 11:43)

Re: Continued.... by 'itpro' (02 May 2013 @ 16:33)

Re: Continued.... by 'AbacusRoccoRacing' (02 May 2013 @ 17:58)

Re: Continued.... by 'kezz99' (02 May 2013 @ 20:56)

Re: Continued.... by 'd-i-y71' (02 May 2013 @ 21:12)

Re: Continued.... by 'essexelite' (02 May 2013 @ 21:28)

Re: Continued.... by 'cpm81' (02 May 2013 @ 21:20)

gearing & weight by 'Eddy' (02 May 2013 @ 21:46)

Re: gearing & weight by 'kezz99' (02 May 2013 @ 23:08)

Re: Continued.... by 'AbacusRoccoRacing' (02 May 2013 @ 22:05)

Re: Continued.... by 'harr1sons' (03 May 2013 @ 9:06)

Re: Continued.... by 'AbacusRoccoRacing' (04 May 2013 @ 21:46)

Saving Weight by 'MJC' (09 May 2013 @ 1:16)

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