Gearing Question

[686raptor]

Ok here it goes, i'm starting to get alittle more serious with 300ft sand drags. Been using using my hill tires and gearing but now have struts and a bar, gearing and tire for the hill are 17-41 with 22-11-8 72ro 12 haulers.

 

Here's my set-up:

Stock frame lightened

+2 forward arms

+14 swinger

bar and struts

82ro staggered 14 rippers

LC Performance 12 mill 552 on meth

2-5 override

Edited September 18, 2011 by 686raptor

[J-Madd]

That's a lot of tire, but then again, that's a long swingarm. Maybe 15/43 or 44 to start with. I'd gear that motor to run 83-86 mph, then fine tune it from there until you get the quickest e.t. My gearing suggestion is based on 9500 peak rpm.

[686raptor]

The track i"m going to this weekend is really loose, thats why the 14 rippers. I put 16-43 on it, you think thats too much? Should i put the 15 on or give the 16 a shot?

[J-Madd]

Try the 16, and if it bogs. go to the 15. 16/43 with 82 r/o tires is a lot of gear, but on a loose track, sometimes you need more I think. I always start gearing based on mph @ what I think my peak hp rpm should be in 5th gear, then look at mph and 60 ft and how it reacts to slight gear changes (1 tooth at a time on the back). Every track can be different, even the same track gets different as the day goes by. If I'm ever at a track without a 60 ft and or/mph I'm lost tuning my tires/gearing/clutch, etc. Total e.t. doesn't tell me how I got there. Getting that right is more important than getting the motor tuned perfectly, imo.

[686raptor]

Ok, thanks for the input! I can get some testing in saturday before the race sunday so we'll see what works.