EricMichael
New member
Is it possible for a piped viper to reach full shift out or "run out of gear" with stock gearing? I've read post on here from the past about many people running the taller (23) gear with thier piped vipers. As said before, if you rev 1,000 rpm or so more, the gearing becomes taller. What I dont get it, would a sled clutched for peak hp say(8,900) have less top end than the same sled running 9,100 rpm? I ride alot of beds and am a pretty light rider(150lb), and the sled spins like crazy, so gearing down would not be a good idea in my case. I would think gearing up would give me alittle less force on bottom end giving way to more traction, and giving me the 3-5 mph on top i'm looking for. Is there any gain to gearing up with a piped viper?I've seen stock and geared up piped vipers on here. Would like to hear from people that have done this to thier sled.thanks
I dont see why you cant run the 23/38 gears and be better off. You have the HP of a 700 SRX now and maybe more.. The late SRX's had 23/38.
EricMichael
New member
yeah that makes sense to me, i'm going to put it in soon and try it, I have your M.O and will send it out this afteroon tom.
yes you have the power of a srx but you also are runnin alot more rpms'.
gearing
Here ya go
8500rpm stock 22-38 gearing with 5% over drive 110.98mph
now with pipes 9100rpms stock gearing 22-38 118.81mph
gear up to 23-38 @9100rpm 124.21mph
I would stay with stock gearing unless you running on glare ice for top speed of 1/2 mile or more.
Here ya go
8500rpm stock 22-38 gearing with 5% over drive 110.98mph
now with pipes 9100rpms stock gearing 22-38 118.81mph
gear up to 23-38 @9100rpm 124.21mph
I would stay with stock gearing unless you running on glare ice for top speed of 1/2 mile or more.
Waay cool pro116. Not meaning to hijack this thread but could you figure out the potential top speed of a srx with 22/38 @ 8500 and 23/38 @8500?
and 20/40 @ 8500? Without overdrives.
and 20/40 @ 8500? Without overdrives.
speeds
8500rpms
Ratio 1.1 5%OD
20-40 91.28 95.84
22-38 105.69 110.98
23-38 110.49 116.02
8500rpms
Ratio 1.1 5%OD
20-40 91.28 95.84
22-38 105.69 110.98
23-38 110.49 116.02
in all out perfect condions the clutches can shift out farther than 5%.My buddies bone stock srx ran 117mph with 22-38 gearing it was actaully out of gear it was overreving.
Remember 1 thing though overdrive is not very efficent in the way of clutching, you most times are better off to be close as possible to 1:1, the belt has the same bend in primary and secondary and you have more belt contact surface in which to grab the belt. The tighter the radius the less efficent it is and the more resistance the belt has to bending in a small radius around the clutch's 
EricMichael
New member
What is meant by 5% over drive? can someone explain this to me please. Is it better to avoid?
yamaholic22
Active member
5% overdrive means you are 5% past a 1:1 drive ratio. At 1:1 the bend or radius of curvature of the belt is the same in the primary and secondary, so the secondary is spinning at the exact same rpms as the primary at 1:1. At 5% overdrive, the radius is slightly bigger on the primary and slightly smaller on the secondary, so the secondary is turning more rpms than the primary. The reason that this is inefficient is because the belt is turning such a tight bend in the secondary, and it creates friction and heat having to bend the belt so tight like that. The 1:1 ratio is more efficient because the belt is being bent the minimal amount at both ends, the exact same bend. That is why mrviper suggests running slightly taller gearing so that the clutches never go over a 1:1 ratio, so that they are always in the most efficient position at top end. Hope that helps.