docjcwatson Posted January 5, 2009 Report Share Posted January 5, 2009 Holy ish! 7 lbs of pressure is A LOT of tire pressure! Especially in soft dune sand. I was going to suggest that your not holding the throttle open all the way, but Travis beat me to it. Also, if you don't have an override, you need to make sure that you are bringing your RPM's ALL the way up in second gear before you shift. You are not launching in first anymore, so you have to adjust before shifting. Quote Link to comment Share on other sites More sharing options...
bigboybanshee Posted January 5, 2009 Report Share Posted January 5, 2009 I could leave in 2nd with my 4mil cub 15/40 gearing. with 13pdl extreme's But.. I've always done the opposite with my tire pressure compared to Travis. More pressure = more spin When I first got my chassis I was runnin 4.5lbs.. and my 60ft were horrible.. 1.67 to 1.75 was spinning till half track. Droped teh pressure to 3.5lbs and My 60 got better, started seeing 1.5's droped to 2lbs and started hooking too hard to keep the front end down.. That's odd, it must be due to different track surfaces and prep. Everywhere I've run, the more air I put in the tires the harder it hooks, and all the other locals do the same thing/have the same effect. Maybe it's the depth the track is cut...I don't know :shrug: Quote Link to comment Share on other sites More sharing options...
shanYE west Posted January 5, 2009 Report Share Posted January 5, 2009 That's odd, it must be due to different track surfaces and prep. Everywhere I've run, the more air I put in the tires the harder it hooks, and all the other locals do the same thing/have the same effect. Maybe it's the depth the track is cut...I don't know :shrug: could be.. :shrug: We'll have to discuss the arts of tire inflation and theory's sometime!! :beer: lol should make for some interesting drinking material!! lol not to get thread off track.. I leave in 2nd.. lol Quote Link to comment Share on other sites More sharing options...
bigboybanshee Posted January 5, 2009 Report Share Posted January 5, 2009 I agree, would be a great discussion!!! I too, leave in second, but I got a 10mil cub....it took several gearing and tire combos to find the one that worked for me, but that's part of the game!! Runs like a scalded dog now Quote Link to comment Share on other sites More sharing options...
Dave I. Posted January 5, 2009 Report Share Posted January 5, 2009 Bigboy, have you ever checked to see if the tire was turning on the wheel at the lower pressure you tried? Quote Link to comment Share on other sites More sharing options...
KEVSWS6 Posted January 5, 2009 Report Share Posted January 5, 2009 Ive had the 13/41 and it was taking away from my topend. I was out racing for halloween with 13/41 and i was racing another banshee and his top end would get me. his was ported with a 4mil crank. So i started talking with him and he had 14/43. Next outing thanksgiving saw him out there again but i had 14/41 and now i would get him everytime by like 5 bike lengths. When i first got the bike back from kevin it would do the 2nd gear launch. what tire pressure r u guys running? Blanco it might be as easy as a jet change and or an air screw turn. It will leave in 2nd. Just has to be tuned well and the clutch slip just right at launch. What plugs and timing are you running? Race gas right? Call me lets talk. 760-815-1316 Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted January 5, 2009 Report Share Posted January 5, 2009 Same as Shayne, I drop psi to hook harder Quote Link to comment Share on other sites More sharing options...
kawiking Posted January 5, 2009 Report Share Posted January 5, 2009 Same as Shayne, I drop psi to hook harder i always thought that will give ur tire a wider foot print and grab. but i can also see it letting ur paddles flex more. Quote Link to comment Share on other sites More sharing options...
rubberneck Posted January 6, 2009 Report Share Posted January 6, 2009 My guess is it must be the difference between a prepared track and the dunes. It seems the drag guys are saying add air and all the dune draggers are saying let air out for more traction. I agree with the duners, but have never put a wheel on a track. I know that climbing hills, with too much air you just dig holes. Let a little air out and the haulers will stay on top more. i guess you just need to play around and works best for you. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 6, 2009 Report Share Posted January 6, 2009 (edited) Very interesting thread. That bike should leave in second no problems, dumping the clutch or feathering it out....it has enough motor, compression and is ported. Should be a rocket...something very simple is not right. Travis...on our tracks, as Shayne said, more PSI is more spin. I've see other posts where guys said more PSI makes the blade stiffer and flex/fold less. Our tracks (all three of them) tell us otherwise, based on time slips and 60fts. Dunes...however, is a different story. Not groomed, deeper and finer sand, no clay/dirt mixed in. Sometimes you have to put more pressure in the tires to dig down past the fluffy stuff... I usually start with 6-8PSI in my tires and drop them down till my 60 foot times come around....and 90% of the time I'll end up with 2.0 to 4.0 PSI. Now....when Ionia was rained out and it was muddy/thick soup, I ended up with about 8 to 9 PSI because it hooked so hard, even the big motor bikes would just bog out of the whole, no matter how much you slipped the clutch out. Edited January 6, 2009 by dajogejr Quote Link to comment Share on other sites More sharing options...
bigboybanshee Posted January 6, 2009 Report Share Posted January 6, 2009 This is definitely a very interesting thread. Amongst the three paddle tracks I've run down here, it's the exact opposite of you guys' situation...I think this just goes to prove the fact that what may work for one, won't work for another...also proving every scenario is always a little different. Good info in here, and something to keep in mind when travelling to different places... Dave I. - I've had a tire slip on the rim, once, but never again...good thought though I just noticed in your sig, blanco, you're running a lightened flywheel...that could potentially be an issue as well. In some cases, the extra weight on the flywheel helps out of the hole Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 6, 2009 Report Share Posted January 6, 2009 I just noticed in your sig, blanco, you're running a lightened flywheel...that could potentially be an issue as well. In some cases, the extra weight on the flywheel helps out of the hole Especially for a heavier guy or so I'm told as well. I'm going to try a lightened flywheel myself one of these days.... Quote Link to comment Share on other sites More sharing options...
shanYE west Posted January 6, 2009 Report Share Posted January 6, 2009 Especially for a heavier guy or so I'm told as well. I'm going to try a lightened flywheel myself one of these days.... Let me know Dave... I'll trade ya. I was running a lightend flywheel all last year. Didn't have any problems with launches.. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 6, 2009 Report Share Posted January 6, 2009 Let me know Dave... I'll trade ya. I was running a lightend flywheel all last year. Didn't have any problems with launches.. I'll say... I have a stocker that needs the nubs cleaned up a bit.... I'd like to have it cut just to see, without ruining my current one! Quote Link to comment Share on other sites More sharing options...
bada450r Posted January 6, 2009 Report Share Posted January 6, 2009 the mods are in my sig. below. This weekend went to dumont and my bike ran prettty well. But it wouldn't let me take off in second gear. gearing now is 14/41 tires are 22 in 8 paddle haulers on 8 inch rim. I feel it could of been faster if i could of got 2nd gear launches to work. BUt by no means was my bike slow. it just seemed to give people a little advantage over me. I believe LC performance was out there and those bike were retarded fast up banshee hill in the 80's. were you the guy in the blue banshee just giving it hell all day long?i saw you and i was wondering what you were trying to do....if it was you............i think you had a bad bog so i think your problem is a jetting issue.any ways call kevin see what he says.......seems like a nice guy :geek: Quote Link to comment Share on other sites More sharing options...
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