Just wondering if anyone as looked at the newst product from thunder products called the power jet, its a external jet that goes into the carb in the front and ties to the float bowl underneath, There is a knod on it for adjustability and gives a range of 10-12 jet sizes. Its ONLY adding fuel at 1/2 throttle and more gradually ramping up to full flow at WOT. It can also be adjusted to flow no fuel at all.
Wondering if that would allow smaller pilots for piped vipers so they can get the MPG back up to 12-14 but run a lot of fuel at WOT to keep things cool and safe through that timing curve. The carbs has its normal jets and this is purely in addition to those and its adjustable.
Looks pretty cool. Thier web site is not updated yet I saw it in the latest snowtech. www.thunderproducts.com
Wondering if that would allow smaller pilots for piped vipers so they can get the MPG back up to 12-14 but run a lot of fuel at WOT to keep things cool and safe through that timing curve. The carbs has its normal jets and this is purely in addition to those and its adjustable.
Looks pretty cool. Thier web site is not updated yet I saw it in the latest snowtech. www.thunderproducts.com
Viper-Rules!
New member
Interesting!
Very interesting. This product kind of reminds me of the dial a jet (Think it was called that) Worked in a similar way except it used air box temperature sensor to calibrate the jets. This turned into a nightmare after wot runs and you shut the sled off for a few minutes. The heat under the hood from the engine would trick the sensor and when you refired it up and took off right away, it would extremly lean out your sled.
Very interesting. This product kind of reminds me of the dial a jet (Think it was called that) Worked in a similar way except it used air box temperature sensor to calibrate the jets. This turned into a nightmare after wot runs and you shut the sled off for a few minutes. The heat under the hood from the engine would trick the sensor and when you refired it up and took off right away, it would extremly lean out your sled.
Yep same company and this time air has nothing to do with it, it just adds fuel and lets you control it. Seems like the ticket as most of the mileage on piped vipers is due to the large pilots where most people ride. Tuning might be a tad tricky but not worse then anything else and all you need to do is turn a knob instead of removing the carbs!
sounds very interesting...if anyone uses these on there piped vipers i want to know because i would like pipes but the mpg is holding me back
woolyviper
New member
sounds like a vari-flow to me - like the tempaflow, but you controlled the setting - only difference i can see is that the variflow metered all of the elements of the carb from the idle to the top end. this looks like it only works on the main jetting.
JeepTherapy
New member
Here is what it said on thier site;
Dial-A-Jet IS NOT like a Power Jet. A Power Jet feeds raw liquid fuel, just like the other circuits, and works from 7/8 throttle and up. Dial-A-Jet feeds emulsified fuel for instant throttle response and works from just above idle to full throttle.
Dial-A-Jet IS NOT like a Power Jet. A Power Jet feeds raw liquid fuel, just like the other circuits, and works from 7/8 throttle and up. Dial-A-Jet feeds emulsified fuel for instant throttle response and works from just above idle to full throttle.
9801srx
Member
just my 2 cents but i don,t think it will help the mpg if it only works at half throttle and up , the pilot jet only controls fuel at idle up to about 3/8 throttle. the jet needle from 1/4 to 3/4 and the main from 5/8 to wot.
there are three things that kill milage on a viper
1. large pilots, 45 pilots stock. add pipes and for most to run best, 50 is where you need to be or you will have a flat spot. i know you can use 47.5 and they will work but you are just using a richer needle setting to overcome the difference.
2. with pipes on a viper with its extra timing, you are now made to use fuel to cool the motor to some degree, not just creat power.
3. cold pipe, hot pipe, cold intake air, hot intake air. uncovered pipes cause huge temp changes in underhood air that is taken into the motor as well as the optimum rpm range changing from a cold pipe to a hot pipe.
all the problems use fuel as a band aid to mask the real problem with pipes. they are all made to use the stock ignition.
there is no magic pill to get milage out of your sled. as you appoach 12mpg you will start having issues that will make your wallet light.
the problems with a viper have all been answered when they built a srx. cover the pipes and muffler to keep the heat in the pipe so the under hood air is more consitant.
covered pipes can be jetted leaner than non covered pipes as the wind blowing over them doesnt change the temp inside as much.
because of the well designed exhaust, you can run a 40 pilot with no flat spot.
main jets with srx pipes and cdi box are 148.8 vented under and 155 vented to the box.
i know it sounds like alot of work to put srx pipes on your sled but how much money and time do you spend putting aftermarket pipes on?
the work has already been done
1. large pilots, 45 pilots stock. add pipes and for most to run best, 50 is where you need to be or you will have a flat spot. i know you can use 47.5 and they will work but you are just using a richer needle setting to overcome the difference.
2. with pipes on a viper with its extra timing, you are now made to use fuel to cool the motor to some degree, not just creat power.
3. cold pipe, hot pipe, cold intake air, hot intake air. uncovered pipes cause huge temp changes in underhood air that is taken into the motor as well as the optimum rpm range changing from a cold pipe to a hot pipe.
all the problems use fuel as a band aid to mask the real problem with pipes. they are all made to use the stock ignition.
there is no magic pill to get milage out of your sled. as you appoach 12mpg you will start having issues that will make your wallet light.
the problems with a viper have all been answered when they built a srx. cover the pipes and muffler to keep the heat in the pipe so the under hood air is more consitant.
covered pipes can be jetted leaner than non covered pipes as the wind blowing over them doesnt change the temp inside as much.
because of the well designed exhaust, you can run a 40 pilot with no flat spot.
main jets with srx pipes and cdi box are 148.8 vented under and 155 vented to the box.
i know it sounds like alot of work to put srx pipes on your sled but how much money and time do you spend putting aftermarket pipes on?
the work has already been done
..SNAKEBIT..
VIP Member
dial -a-jet does not have a sensor in the air box?
you must be thinking of Hotzman, tempa-flo or Atacc
you must be thinking of Hotzman, tempa-flo or Atacc
leaning out the midrange isn't good for trail riding.That's where your ruuning most of the time is on the pilot and needle.
another thing that kills a piped viper is the throttle drop. you have the sled jetted properly for midrange, wot. you then ride the sled at wot for a time, lets say a mile. motor is fine, rpms are where the timing has retarded back to a safe advance, lets say 9000rpms. you then let off the gas say to half throttle, jetting is correct for half throttle but you have just taken a motor that is jetted correct and increased the timing by say 4-8 deg, depending on where the rpms were at wot. this is where the jetting burn up issue is. if the sleds cdi was just set at a safe timing and would retard as the rpms dropped, there would be alot less burn downs with pipes.