Need for Speed 2
TY 4 Stroke Junkie
guys what gears at sea level will produce what boost. was hoping to get better info to decide how much squeeze needs to be lowered. sent the kit out with 27-23 now they tell me i need some more gears 24 25 and 26 at 100 each u. s. any info would help on the pocket book .
- Joined
- Apr 17, 2003
- Messages
- 5,562
- Reaction score
- 1,479
- Points
- 2,003
- Location
- Menno, SD
- Website
- www.ulmerracing.com
- Country
- USA
- Snowmobile
- 2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
- LOCATION
- Menno, SD
- WEBSITE
- www.ulmerracing.com
If you need gears send me a PM and I will get you a price quote on them.
On the Stage-II
Rotrex 30-64/74 the maximum compressor speed is 120,000 rpm
(A) The 30-64/74s are internally overdriven 9.49:1 (Cannot be changed)
(B) 26/22 pulleys is a 1.181:1 ratio (Can be changed with pulleys)
(C) Engine Rpm (Can be changed with clutching/gearing)
Example: (A)x(B)x(C) must equal less than 120,000
9.49 x 1.181 x 10,500 = 117,680 (this is perfect)
9.49 x 1.181 x 11,000 = 123,284 (should not be run but ok for short 500’-660’drags)
9.49 x 1.181 x 11,200 = 125,526 (if it hits the rev-limiter you’re way off)
Rotrex 30-64/74 the maximum compressor speed is 120,000 rpm
(A) The 30-64/74s are internally overdriven 9.49:1 (Cannot be changed)
(B) 26/22 pulleys is a 1.181:1 ratio (Can be changed with pulleys)
(C) Engine Rpm (Can be changed with clutching/gearing)
Example: (A)x(B)x(C) must equal less than 120,000
9.49 x 1.181 x 10,500 = 117,680 (this is perfect)
9.49 x 1.181 x 11,000 = 123,284 (should not be run but ok for short 500’-660’drags)
9.49 x 1.181 x 11,200 = 125,526 (if it hits the rev-limiter you’re way off)
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