sostarn
Veteran
Hey folks,
So here's the scoop. Off the line were dead even, in the last 3/4 of the race he seems to pull on me by 1 or 2 sleds and then he doesn't pull anymore... we stay even. His sled is a REV x 600 Adrenaline with a Predator track.
My sled seems to be running sweet. I'm hitting 10,500 RPM's... not like last year where i couldn't get past 9500. List of mods this year include the following:
Primary spring: O-S-O
Extended 121 - 136" with predator track 1.25"
23/39 gearing (i only went down one tooth on top gear)
Secondary: still set stock at 60 degrees (i've heard to set this at 70 if using O-S-O in primary??)
Any ideas? Gear up on bottom gear? Just occured to me, could i be running the track to tight? The way i tighten it is i hang 20lbs of the bottom of track and measure about 1" of sag from bottom of slider to track.
So here's the scoop. Off the line were dead even, in the last 3/4 of the race he seems to pull on me by 1 or 2 sleds and then he doesn't pull anymore... we stay even. His sled is a REV x 600 Adrenaline with a Predator track.
My sled seems to be running sweet. I'm hitting 10,500 RPM's... not like last year where i couldn't get past 9500. List of mods this year include the following:
Primary spring: O-S-O
Extended 121 - 136" with predator track 1.25"
23/39 gearing (i only went down one tooth on top gear)
Secondary: still set stock at 60 degrees (i've heard to set this at 70 if using O-S-O in primary??)
Any ideas? Gear up on bottom gear? Just occured to me, could i be running the track to tight? The way i tighten it is i hang 20lbs of the bottom of track and measure about 1" of sag from bottom of slider to track.
wideopenorbroke
Veteran
Wow that sucks The only thing I could think of is clutching or you gearing but I"m no expert.I have a clucth 2004 rx1 with a m-10and I out run the 800 Ski doos 2002 old style mxz But I have to do it from a 20 mile roll else it will be close but that is a 800.I had one bet me by 1/2 sled and greased the jackshaft bearing and put new springs in the clucthes.that took care of that
Len Todd
TY 4 Stroke God
Gearing seems a bit odd. It's like you undid the benefit from the 23 by going to a 39. ??
More track = less speed. Also, new tracks take a while to break in. Got 500 miles on the track yet?
I set the track tension on my shortie just a tad bit tighter than ratcheting. I have about 1 1/2" of track sag with 22 lbs hangin'. You have a long track, you should probably see more sag than I do and still not ratchet. Your track could be too tight.
More track = less speed. Also, new tracks take a while to break in. Got 500 miles on the track yet?
I set the track tension on my shortie just a tad bit tighter than ratcheting. I have about 1 1/2" of track sag with 22 lbs hangin'. You have a long track, you should probably see more sag than I do and still not ratchet. Your track could be too tight.
sostarn
Veteran
Len Todd said:
it was a 121" and i believe stock gearing is 24/39. I went down one tooth on the top gear to 23 and kept stock bottom gear. If i remember correctly the Warrior is 23/40... that's why i suggested changing that but i'm not sure to what end. I only have 100 miles on track so far. It sounds like i might be running the track a bit too tight.
Turk
Tech Advisor
Your overrevving . sled should holesot at 9800 & climb to 10,300 tops. Huge diffin a drag race at those rpm,s.
sostarn
Veteran
Turk said:
how can you tell i'm overrevving....? what you mean holeshot at 9800 and climb to 10,300? i usually don't take my eyes off lake too much when im hard accelerating in order to pay attention EXACTLY where the tach is at... all i did was glance down and see the tach was slightly above 10,000
Turk
Tech Advisor
I can tell your overreving because in your 1st post you said your hitting 10,500 rpm. If your clutching is off you are wayyyyy slower.
sostarn
Veteran
hmmm the only thing i did was change the spring in the primary to O-S-O... what about changing the secondary from 60 to 70 degrees? or is it something i just have to try and play with?
Turk
Tech Advisor
changing from 60 to 70 will make it worse
Len Todd
TY 4 Stroke God
The OSO probably brought your Rs up. I dumped the OSO spring that I tried. Turk's probably got hard data that tells him the Rs need to be lower for a good holeshot.
Taking the secondary from 60 to 70 degrees twist will increase the Rs even more.
But, I see 10,200 at holeshot, then 10,000 at hookup and then creep backup to 10,500 at top end. I am set up per Allen Ulmer's Stage II set up.
The lower Rs at holeshot will give you less track spin and the peek power RPM is 10,200. But there is a pretty wide band, before you start to shave off significant power.
But Turk is probably right. Better holeshots could be made with slightly lower RPM. I am not into dragging. So I opted for a slightly higher range. Also, I have an Ice Tech track, that helps hookup traction a little anyway.
I'd dump the OSO Primary Spring.
Taking the secondary from 60 to 70 degrees twist will increase the Rs even more.
But, I see 10,200 at holeshot, then 10,000 at hookup and then creep backup to 10,500 at top end. I am set up per Allen Ulmer's Stage II set up.
The lower Rs at holeshot will give you less track spin and the peek power RPM is 10,200. But there is a pretty wide band, before you start to shave off significant power.
But Turk is probably right. Better holeshots could be made with slightly lower RPM. I am not into dragging. So I opted for a slightly higher range. Also, I have an Ice Tech track, that helps hookup traction a little anyway.
I'd dump the OSO Primary Spring.
Nate01
Extreme
Man that sucks....I have no problems with my stocker RX kickin' #*$&@ against my buddies 06' F6 and 05' Rev 600.....havent been beat by any 600 or 700 yet....but now I have some tinkering done so we will see the difference....
sostarn
Veteran
yeah his sled is pretty fast... and for some reason i thought they came with ripsaw tracks... not the predator
hence, i expected to walk all over him if he had the ripsaw
hence, i expected to walk all over him if he had the ripsaw
Nate01
Extreme
I junked the crap stock track and put a 1" with 220 picks...set my tranfer up and this thing does nothing but HOOK and rip your arms out....almost the same feeling I get from my CAT but not quite enough yet....hoping to make this RX walk my CAT up and down and then ill have both my machines just right for this year....couple more things ..... 
sostarn
Veteran
im going out tomorrow again so i'll pay attention to my holeshot RPM's and what it top's out at as far as RPM's go. I may have been hasty in saying it was 10,500. It's a brand new 1.25 predator 136" and i've only got 100 miles on it. It sounds like i may be running it a little too tight so we shall see. My dash plastic where the guage pod sits is cracked to hell so it's vibrating like crazy under hard acceleration.
The sled i raced is a REV 600 X Adrenaline. They came with clicker shocks up front and in the skid... similar to GYT-R clicker shocks like on the Apex's. I'm not sure what else performance wise was different than regular REV 600. He only has a aftermarket can on it and that's it.
Let u know what happens if we meet up again tomorrow or in the future.
The sled i raced is a REV 600 X Adrenaline. They came with clicker shocks up front and in the skid... similar to GYT-R clicker shocks like on the Apex's. I'm not sure what else performance wise was different than regular REV 600. He only has a aftermarket can on it and that's it.
Let u know what happens if we meet up again tomorrow or in the future.
Len Todd
TY 4 Stroke God
Also, new tracks are slower and new longer tracks are slower yet. Takes about 500 miles to break in a track.
