1320 gearing for an improver

383stroker

383stroker

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Joined
Nov 18, 2008
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ontario
Hi guys i was just wondering is you could help with gearing on my srx700 improver on asphalt. i will be running 1320ft. not sure if it is worth buying 10t drivers or 9t drivers. also has anyone see Valin around i am pretty sure my dad bought his old 780 i was just looking for some more info on it. any info would be great.


Thanks
 

To be able to help you out, more info is needed. What RPM do you spin this engine at? What does it make for power? Is it at improved stock weight? Valin is around but spends more time on the 4 stroke side since buying his Nytro. What is it you wanted to know about your dads sled. I can ask Valin or possibly help myself as I know the sled very well.
 
Going to turn it to 9800rpm and it 185hp+ hp. For my dads sled I just wonder what springs he used in the clutching what rpm does those pipes make power at. And have he ever tried high rpm pipes on it?
 
The gearing Tony gave you should be very close. 23/38 is geared for 127.39 mph at 1 to 1 with 9 tooth drivers and 9800 rpm's.

I do not believe Ryan ever ran high rpm pipes on that sled! I have seen the porting and don't think the engine would response really well to the higher rpm's.
Not sure on the springs but I do know the engine makes power around 8600. I have the Dyno sheets for it here somewhere. I'll try posting one of the runs.
 
Thanks for the info. Do you think it is worth putting 10 tooth driver in and gearing down? Just trying to make it roll easier
 
We tried To run 11's with a speed track and studs but could not get the clearances we needed. You may be able to do it with a tar track. You will have to modify the skid to compensate for the added diameter though.
 
Rpm x top gear / bottom gear x track pitch (2.52) x 9 for (9 tooth drivers) / 12 / 5280 x 60 = speed at 1 to 1 ( no overdrive)
 
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