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Old 12-23-2012, 08:32 AM   #1 (permalink)
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Gas mileage

Hey guys,

So I hit up Lodi on day one of trail opener. I added a longer track, new engine, tons of mods (reeds, clutches, gearing lower, air box, pipe, can etc. Are all these mods destroying my gas mileage?

I put 60 iles on 12 gallons. Which is 5 miles per gallon.

Any ideas on how to improve it.

2004 Pro X 600 136" Here's some pics of the upgrades for this year:

New seat covered with softer foam
New Camo Intense 1.5" lug 136" track
Tracks USA extension and rail kit
rebuilt top and bottom. All OEM New parts.
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Gas mileage-imag0010.jpg   Gas mileage-imag0017.jpg  
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Old 12-23-2012, 09:02 AM   #2 (permalink)
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Get rid of the mods. Long track more weighed. Lower gear bad for gas miles.


Sounds like you built a drag strip sled. I sure other will chip in it like anything else it all needs balance. Also depeding on what your riding in will effect milage too. Powder your going use a lot more gas over hard pack!
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Old 12-23-2012, 09:03 AM   #3 (permalink)
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Bigger motor = reduced MPG
Longer track = more power to turn it = reduced MPG
Lowered gearing = higher RPMs for same speed = reduced MPG

People don't buy 68 Camaros for 45MPG... They buy a Prius for that. Figure out which one you're after, and mod accordingly.
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Old 12-23-2012, 09:18 AM   #4 (permalink)
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Quote:
Originally Posted by Grudman View Post
Get rid of the mods. Long track more weighed. Lower gear bad for gas miles.


Sounds like you built a drag strip sled. I sure other will chip in it like anything else it all needs balance. Also depeding on what your riding in will effect milage too. Powder your going use a lot more gas over hard pack!
Far from a drag strip sled.

The thing is the pro x chassis have a horrible front track attack angle to begin with. Throwing a longer track just adds to the resistance. Than your gearing to compensate for the extra weight and resistance the motor is trying to turn. Wheat size jets did you change to and what kind of reeds and pipe did you go with?


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Old 12-23-2012, 10:13 AM   #5 (permalink)
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Far from a drag strip sled.

The thing is the pro x chassis have a horrible front track attack angle to begin with. Throwing a longer track just adds to the resistance. Than your gearing to compensate for the extra weight and resistance the motor is trying to turn. Wheat size jets did you change to and what kind of reeds and pipe did you go with?


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I have a SLP single pipe and can. Not sure on the jets at this moment. I know its running perfect where its at for this temps so I'm not changing it again.

I am aware that all these mods ruin MPG and MPG is not my goal. I could care less about fuel cost. Its now running me into shorter trips and necessity to plan my routes around gas stations.

I dropped the mounting hole on the front to change the angle of attack on the track. That is no longer a problem. When I didn't you could tell the loss in power to the ground. No more. This thing hooks like a nhra top fueler now.

I was just wondering if there is any other idea's or am I just flat out stuck with 5mpg?
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Old 12-23-2012, 10:17 AM   #6 (permalink)
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E3 spark plugs


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Old 12-23-2012, 10:18 AM   #7 (permalink)
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Your kind of stuck. Unless you blue print the chassis and get it all free rolling. My 03 pro x 600 got around 9-10 on a 121x1 track and my 800 pro x now gets around 11-12 but I could only ride it for a short period so I might be off on my number on that.


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Old 12-23-2012, 10:18 AM   #8 (permalink)
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E3 spark plugs


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Those don't do anything in the big picture.


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Old 12-23-2012, 10:21 AM   #9 (permalink)
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I have done everything I can think of to destroy my MPG. I figured this was the response I would get. All that matters is I have fun and don't run out of gas.

I have the E3 plugs in. Not helping mpg but burning very clean and perfect color.
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Old 12-23-2012, 10:23 AM   #10 (permalink)
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The new plug design helps burn fuel more efficiently for more mpg and reduce emissions


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Old 12-23-2012, 10:23 AM   #11 (permalink)
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I have done everything I can think of to destroy my MPG. I figured this was the response I would get. All that matters is I have fun and don't run out of gas.

I have the E3 plugs in. Not helping mpg but burning very clean and perfect color.
Awesome


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Old 12-23-2012, 10:46 AM   #12 (permalink)
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I can't change the way it rides. I love it too much now. Last year I loved it ... but this year with all the new mods it will stay my main sled this year. I'll probably sell the 2005 Indy 500 liquid I have and put it towards a rush next year.
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Old 12-23-2012, 11:12 AM   #13 (permalink)
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I can't change the way it rides. I love it too much now. Last year I loved it ... but this year with all the new mods it will stay my main sled this year. I'll probably sell the 2005 Indy 500 liquid I have and put it towards a rush next year.
Do you race your sled too??? Because I think it would dominate


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Old 12-23-2012, 11:27 AM   #14 (permalink)
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Do you race your sled too??? Because I think it would dominate


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I wanted to get into racing. I'd get an IQR if I had enough time though. And thanks. It does dominate now. I have to upgrade the carbides though. I'm pushing a little in the corners. I have 8" studboy shaper bars on there now. They were awesome with the 121". Now with the 136 thats 1.5" lugs with 156 studboy lightweight double and single backers in a 4-2 pattern up the middle @1.675" it pushes too much.

Any recommendation on new bars. I was thinking maybe getting new ski's and doing some dual runners but I like to go off trail and on and worried the double runners might not be that great off trail.
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Old 12-23-2012, 11:45 AM   #15 (permalink)
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I'm not sure


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Old 12-23-2012, 01:09 PM   #16 (permalink)
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Sounds like a drag sled to me lol
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Old 12-23-2012, 01:14 PM   #17 (permalink)
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Far from a drag sled this is one of my drag sleds
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Old 12-23-2012, 04:11 PM   #18 (permalink)
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Far from a drag sled this is one of my drag sleds
Yup that is a drag sled
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Old 12-23-2012, 04:14 PM   #19 (permalink)
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Back to the op. have you installed the slp big air kit? Cones with air box kit and 2 flo rites for by speedo and tach and 2 mesh vents for by your steering post? Let's more cold air in so motor will run better instead of being choked up


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Old 12-24-2012, 05:00 AM   #20 (permalink)
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Actually, those 8"ers should be sufficient for your set up.
A little more ski pressure would solve the scuffing problem.

As far as getting as much as you can from the chassis, reducing any rolling resistance will gain you back some [maybe even as much as 1mpg].
Do you have the torque stops set correctly to maintain C to C and deflection?
Is your offset optimized?
Is the track centered and as loose as possible?

These little things will add to top end and a mpg.
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