I picked up a new to me sled last year and with the limited snowfall, I used it twice for the year. I thought it ran fine and pulled strong. I was very disappointed with the fuel mileage 6-7mpg at best. It did have SLP triples and I know they really cut into fuel mileage. They will also add 30+HP. This year I decided to put it back to stock for economy reasons. In doing some teardown and inspection work, I discovered my power valves were very gummy and the center one was stuck and the cable pulled through. I am in the process of getting the valves repaired and from reading up on the power valve motors on this site, I will be doing annual maintenance/cleaning on them. I stated earlier I “thought” the engine ran strong, but it was probably the added HP of the triple pipes that I was noticing. I can only imagine what it will be like when I get it properly fixed. It also got me to thinking what effect would a stuck power valve have on fuel economy? I guess I don’t know what position is was stuck in, but I have to imagine it would impact both performance as well as fuel economy. Was my horrendous fuel economy due to the triple pipes alone, or did the gummy/frozen power valves contribute significantly to the poor economy?
Any thoughts or input on this idea?
Any thoughts or input on this idea?
bluemonster1
LIFE MEMBER ONLY ONCE!!!
any thoughts..h"mmm!! Yes.With added triple pipes you are increasing the HP thus sucking more fuel..On the XTC700 with triple pipes installed,my stepson has seen a reduction in the gas mileage .But he loves the extra power he has also.Can expect cutting your gas mileage roughly in half I was told..he had to richen the jetting to run them pipes..so more fuel being eatin .As for a stuck valve..can't help anything.
My guess would be it would affect fuel economy (and high rpm performance) since I'd guess it stuck in it's at-rest/closed position.
6-7 mpg is lower than what I've read about the addition of triple pipes have on Vipers (closer to 9-12 mpg).
You may want to hold off putting the single pipe on until you've had a chance to ride it with properly functioning PVs.
6-7 mpg is lower than what I've read about the addition of triple pipes have on Vipers (closer to 9-12 mpg).
You may want to hold off putting the single pipe on until you've had a chance to ride it with properly functioning PVs.
Barely measurable
A stuck power valve on one cylinder won't even make a measurable difference in your fuel mileage. Your fuel problem is the pipes. Taking them off will double your fuel mileage......and you'll notice a big difference in power.
Madmatt
A stuck power valve on one cylinder won't even make a measurable difference in your fuel mileage. Your fuel problem is the pipes. Taking them off will double your fuel mileage......and you'll notice a big difference in power.
Madmatt
Devilin AblueDress!
New member
Maybe I missed it but is this the 03 viper listed as "my sled" or a SRX or is it a newer PV venture? Sticky valves/pull threw on any of the above will impact economy but I do not think dramatically. Blues comment about pipes/richer carb setting hitting mileage...HARD! The other thing is that 30+ horse number is based off properly functioning power valves, so gains with your valves would be MUCH less than 30hp, possibley even less than stock. Getting valves fixed it should really pull like a SOB with slighty better MPG. Viper/venture going back to single or SRX going back to stock tripples I would suspect it to run about the same with better MPG, Keeping in mind either way you need to tune carbs to exhaust, just changing pipes/can may end up way rich. Personally mileage is the last factor of the equation.