Who's Running Twins & What Do Ya Think??
- Thread starter alexhack
- Start date
second year with mine on my M1k. I would like to try a Speedwerx single to compare. In loaded conditions like over the hood snow they are hard to keep hot. I use an AI fuell controller and have been able to make them work, but its not the best way to go for a boondocker. They are more of a WOT type setup. Im not dissapointed I just appreciate the better consistency of a single
The hot pipe thing is just my own theory. Dale Cutler says to run the not coated. If you run them make sure to use pre-filter material on all the vents to keep snow out. I think snow dust that cools the pipe quickly has been part of the problem.
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alexhack
Well-known member
Hmmm....Not very many guys run multiple pipes any more. Back in the day of triples everbody had triple pipes, no one would put a single on a triple. And the older twins had twins. Also seemed like alot of M7's had twins but now everybody is all about single pipes. What gives?
singles are alot less hassle and i think now days most people would rather have a a pull and go ride then tune all day. sure you get more power out of twins but like mentioned they are mostly a wide open performance gain and they are quite a bit more tempermental to atmosphere changes. i wanted to try the hp game on my carb m7 last season so i spent 800 bucks on a set of jaws twins and waisted most of the season tryin to get them to run right but couldn't and ended up losin my *** on them when i sold them for like 350 bucks just cuz i didn't want to look at them anymore.
alex I would say you should run a single for the mountains for sure. Pretty much agree with what the guys are saying. "Yes I wish they worked better", they should work better, why don't they work better. The other thing you seem to hear is "well they really ripped this one time" I was thinking the same thing as I have been riding Cat's in the mountains since- well a long time and my sleds used to have twins and triple right from the factory and ran great. Did not seem to be overly finicky. Another issue is the tight quarters under the hood. You think you can melt alot of stuff with a single try cramming twins in the same space. There may be advantages but for the everyday rider I don't think they are the best bet. I know you are doing a ton of research on goodies for your M8 and I have been hearing about strong running D&D 901 kit for your sled.
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alexhack
Well-known member
Thanks for the replies guys.
I see what your saying. I figured they would be finickier to tune. I just thought the advent of completely tunable EFI, via a push of a few buttons compared to tarring carbs apart, would have gotten rid of alot of the hassel with them. Guess not.
Been looking around and the BD box bypsses the altitude and temp compensation. Where the Attitude, Pure Logic and Fantom boxes keep it intact. Wouldn't having the compensating features make a difference?
Attitude, Pure Logic and Fantom boxes are "Set & Forget" unlike the BD box that you have to mess with almost every ride depending on your altitude and temp.
I see what your saying. I figured they would be finickier to tune. I just thought the advent of completely tunable EFI, via a push of a few buttons compared to tarring carbs apart, would have gotten rid of alot of the hassel with them. Guess not. Been looking around and the BD box bypsses the altitude and temp compensation. Where the Attitude, Pure Logic and Fantom boxes keep it intact. Wouldn't having the compensating features make a difference?
Attitude, Pure Logic and Fantom boxes are "Set & Forget"
unlike the BD box that you have to mess with almost every ride depending on your altitude and temp.
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Thanks for the replies guys.
Been looking around and the BD box bypsses the altitude and temp compensation. Where the Attitude, Pure Logic and Fantom boxes keep it intact. Wouldn't having the compensating features make a difference?
Attitude, Pure Logic and Fantom boxes are "Set & Forget"
that is not true! the boondocker box DOES NOT interfere with the ecu's compensating abilities... if it is working correctly that is.
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alexhack
Well-known member
I stand corrected.
I just flipped through the instructions (20 pages ) and yes it stated that it does not effect the compesation qualities of the ECU. I just assumed that it did when people said if you had a booondocker box you would be messing with it almost every ride and that they are not set and forget. My bad. I guess as the saying goes when you assume it makes an *** of u and me.
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Spaarky
Well-known member
It isnt suppose to, but I would disagree with that. I am not here to get in a pizzin match either. All I know is we just pulled a BD box off a sled that was only a year old and put on a different box. All the problems we had before disappeared, no more messin around with the box all the time and the sled runs great.... explain that????
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alexhack
Well-known member
What box did you switch to? I've talked to Attitude Industries, Pure Logic (Ogden Valley Sports) and Fastrax Motorsports and they all claimed that thier boxes are "set and forget" and don't touch the compensation. Thats why I came up with the assumtion that the BD box wasn't. Seemed like everybody had BD and was saying that they messed with it alot. I'm currently waiting on an email from boondocker to get their claim. But it is in their manual.
So much for this thread being about twin pipes. Its funny how that happens.
So much for this thread being about twin pipes. Its funny how that happens.
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no worries... like i said if it is working correctly.
I run Jaws twins on my 07 m8 and it ripps hard from bottom to top. I have a couple maps loaded for under 5000 ft and one for over 5000. Had a heat issue at first but now she looks like a baked potato. Pulls on my buddies 09 800 with slp set up and makes almost 10 mph more tracks speed side by side and is way snappier.
The BD box does not take info from the air sensor in the airbox. The others take that info into account. The biggest difference between the BD box and say the Attitude box is this. The BD box adds or subtracts fuel in increments. Say 5 units of fuel added. The Attitude adds or subtracts in percentages. This is more like the stock ECU. The advantage to the AI is that if the stock ecu is adding 100 units of fuel it will add 10 units, if it says 200 it will add 20 so on and so forth. When you are working with units of fuel, at 100 it adds 10 at 200 it adds 10. That is why the BD box has the ability to have a couple of maps. BD is coming out with a different box that adds there own air temp sensor. It will not compensate for barometric pressure like the AI. Either Derek or Doebek has a patent on this so BD is having to figure out a way around this. I have been very happy with my AI box and I do have experience with the BD box.
06 m7 jaws twins and I can honestly say that I have not touched the box in three years. The sled runs the same every day. But on your m8 I would put the slp single on and ride the thing. The twins will make more power but the melting issues is not worth it in my opinion. The key to any pipe single or twins is correct clutching and correct fuel.
I just wanted to add that I have had zero melting issues with my CPC twins
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alexhack
Well-known member
Wouldn't lower gearing help that issue?
I imagine as long as you use heat tape and thin pipe insulation where the pipe is close to the hood and other plastics, that should get rid of that problem. Wouldn't it?
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brendan ross
Well-known member
i have slp twins on my m7 its awsome just a little harder to tune that single
and my buddy has dd twins on his 800 halls a$$ but then again tuning is the issue but once you find were youre supposed to be tuning varies on the temps outside and elevations
and my buddy has dd twins on his 800 halls a$$ but then again tuning is the issue but once you find were youre supposed to be tuning varies on the temps outside and elevations
