anybody ever put EFI on an 03 MTN viper?

C

catmechanic

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just wondering if this has ever been done? i have a buddy that has one. i work on it with him when he needs it and one of his complaints is that its carbed. any insight on this? links?
 
thats what i told him to buy. i was thinking the automatic altitude and temp compensator. are they easy to install? how about price on the triple?
 
I didn't know you couldn't get the Vari-Flo, maybe buy a used kit.

I myself would rather use the Vari-Flo vs the ATACC

I would rather turn the dial, than rely on the system, but without Vari-Flo now there is limited options....
 
that is a little spendy. for 240 bucks, i could pull my carbs to rejet for out west. it would be pretty sweet though. i don't a whole lot about the pilots, but i think you only need to adjust them for altitude changes right?

if it made the pilot switch easy, and then you had something like a tempaflow, changes would be a snap. but you would probably have 500 invested in a jetting swap. not really worth it in my book.
 
In theory the attac will do both altitude and temp. Cost about $250 or so for one. The link above is for fuel screw adjustments. Works with the pilots but not the same thing.

How often are you making the trip out west? If it's only a few times a year, just jet for the trip. Doesn't take very long to do and the more you do it the faster you get:)
 
usually just once a year. my buddy is one of those guys that 9 out of 10 times thinks the sled isn't running right. he has this 03 mtn viper and also a 97 vmax 700 that we stretched to a 144. now, the 03 seems to be fine through out the different temps of the winter. when its 30 degrees, it seems to run pretty good. the 97 however, runs really rich when its warm out.

he seems to think that he needs to rejet for every 10 degrees of temp change. if its below zero, i might not even go out because he thinks it will melt down since he isn't jetted big enough. i think for this reason alone he should invest in a compensator.

so, lets see if i understand the concept. does it work like dpm on the skuds? jet it big for the coldest temp you are going to ride and then it reduces fuel as the temp rises?
 
Tell him to get the Tempaflow for the 97. I've run one for over 8,000 miles on my Viper, and have never had a problem. Just remember to let underhood temps stabilize after you make any short stops before you pin the throttle. Once I had mine dialed in, I never had a burble on the ol' girl. As far as the Viper, for 1 or 2 trips, I'd run a Tempaflow and rejet for the trip. You CAN compensate somewhat for altitude with the Tempaflow, but must do it manually. Hope you can help this guy out LOL!!
 
tempa flo or attacc either one works great i have one of each,they will keep your jetting good always ,tempa flo has a bit of manual adjustment and costs less when you jet for altitude it takes 30 seconds, attacc is fully automatic
 
I have the Atacc on my Mnt Viper and it works really slick. You jet the largest for the temps/altitude you plan to run at and the unit automatically compensates (leans out fuel) the carbs out from there according to barometric pressure and existing temps (geez I hope I got that right.....).

I ran the vacuum tube out from under my hood and up to underneath my bar/riser pad so its not considering (compensating ) for any warm air from underneath the hood and falsely leaning my Mnt Viper out.

I've never had a problem. Where we ride in Northern MN mostly, the day can start at negative temps and then get up to +20 or so in a few hours, so jetting is just a PITA. You need one of these.

But I've also had my machine out west a few times and never had to jet for going out there either. It also helps for triple pipes.

It's basically the same as FI, which I'll never buy another new sled if it doesn't have FI.

Mike
 
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