blacken700
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- Aug 10, 2004
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i have a 2002 viper with cpr pipes it running at 9200 rpm stock gearing. the distance is 3000 ft. its now running 114 mph on radar.I''d like to find more top end any help would be great. thanks
redsnake3
New member
you need to change your gearing to a taller configuration since with the pipes your drive/driven ratio has changed.
blacken700
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- Aug 10, 2004
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what would you run for gearing redsnake3
vipertripplexxx
New member
MPH* = (RPM/GR) x (DC/12) x (60/5280)
(9200/1.7272)x(22.68/12)x(60/5280)
(5326)x(1.89)x(.0113636)=114.3MPH At 1:1 ratio
Your clutches aren't shifting past 1:1 ratio, same problem I was having with my CPR piped viper. Do you have the heavy hitters? What setup? good snow/ice conditions? .85 shift ratio is around 130 MPH@9200.
(9200/1.7272)x(22.68/12)x(60/5280)
(5326)x(1.89)x(.0113636)=114.3MPH At 1:1 ratio
Your clutches aren't shifting past 1:1 ratio, same problem I was having with my CPR piped viper. Do you have the heavy hitters? What setup? good snow/ice conditions? .85 shift ratio is around 130 MPH@9200.
blacken700
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- Aug 10, 2004
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vipertripplexxx what did you do to get it to shift out ,were running on ice
vipertripplexxx
New member
Blacken,
Add tip weight to get it down to 9000 rpm, then add some secondary spring twist will help. on ice you should do better than 114 on speedo. The most twist I had was 90*, but maybe more will help? I'm going to test a couple of setups this weekend, i'll keep you posted. Do you have hitters? What springs? Black secondary with no paint marks?
Add tip weight to get it down to 9000 rpm, then add some secondary spring twist will help. on ice you should do better than 114 on speedo. The most twist I had was 90*, but maybe more will help? I'm going to test a couple of setups this weekend, i'll keep you posted. Do you have hitters? What springs? Black secondary with no paint marks?
23/40 sx gears
lighter and ratio is slightly more effecient.
lighter and ratio is slightly more effecient.
vipertripplexxx
New member
40/23=1.739 gear ratio
38/22=1.727 gear ratio
ratio difference=0.012
114 x 1.727=196.8
196.8/1.739=113.2 MPH, actually lower top speed with that gearing. might be easier for clutches to shift out?
maybe more efficient with sx gears?
Do you have a grey ring on clutches? Bottom line is rx's with more weight, and same horsepower are running 120-125 out of box 3000ft. Clutch needs work. M2C
38/22=1.727 gear ratio
ratio difference=0.012
114 x 1.727=196.8
196.8/1.739=113.2 MPH, actually lower top speed with that gearing. might be easier for clutches to shift out?
maybe more efficient with sx gears?
Do you have a grey ring on clutches? Bottom line is rx's with more weight, and same horsepower are running 120-125 out of box 3000ft. Clutch needs work. M2C
800
New member
How fast do you think it's gonna go? I figure with stock gearing 1:1 is 110.4. If thats a radar speed you already have overdrive so gearing it up will most likely slow it down unless you have the power to pull it, which if you only get 114 you don't have the power to pull it to full overdrive which would be over 120mph. The only thing you could try is gearing it down 1 and making sure you are set up for all the overdrive your clutches can give you and you may get a couple more mph with better accerlation. 114 is pretty close to what you're gonna get.
vipertripplexxx
New member
Those are jackshaft/driveshaft calculated speeds. so when you read it on the speedo @ 114 you can assume thats at about 1:1 ratio. Ive seen sleds with 120 horse pull that kinda speed in 3000ft. Driven alot of high horsepower sleds, and I know iv'e got alot left up top. Were talking piped and ported 700 yami, come on guys have some faith.