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Twins Are RIPPIN

I

IDAHO HOT SHOT

Well-known member
After last seasons nightmare with my 09 800, it is AWESOME to have this sled finally running good. I installed SLP twins on the new sled before it left the shop. It ran good for a couple rides and then not so good. What I thought to failing clutching turned out to be a slowly failing motor. Just a little less compression every ride. I had the update done this fall and then sent the head to Carl's for the 30% race gas cut. I also installed a 153 Powerclaw track. This thing hooks up very well and the track speed is amazing. I did not look at the actual speed, but it feels pretty dam good.I am running 8050-8200 RPM's. I could stand 200 more but I an VERY impressed with this set up. I don't want to start a war, but there were a few "other brand" sleds there with longer tracks that were not keeping up. The longer tracks did show up as the north slope snow got deeper. Now I would like to see or ride a 163 with twins just to see how good it works in the deeeep stuff. I am running 62 Belly Busters, Blue/ Pink primary, 58/40 helix, stock sec spring, 19-41 gears. I'm only a tank and a half into the updated motor. Im wondering if I should let it break in more before I start dinkin around with clutching or what. If anyone has any input, feel free to chime in.
 
my 7 with twins 174 frickin rips it did good last year but now the clutching is better its skis in the air everywhere. cool thing about running twins on the cfi there not as finiky and if you need to change fueling you no longer have to change jets you take 30secs adjust accordingly with a push of a button.


mines actually running low on rpms max i got was 8350 i wanna get it up to 8500,8600,8700 try them out
 
Just wait until you feel 8500 RPM with that setup! If you like it now YOU will LOVE it when it's running right! I run a little different clutch setup and when it's right it's really pretty awesome for a stocker with pipes. The updated 30% head has slightly less compression then last years setup so we might expect to see just a little bit less weight pulling ability post update. Mine last year really needed 63gr and couldn't pull 64's. So I just ran 62epi and it was a little hot unloaded and lower but pretty darn good at 7000ft to 9000ft. Mines got a sensor issue that we are chasing but in theory it should be right on for our conditions when I finally get that figured out. Wild fuel reports too...still working and learning that aspect but you've got to have the system consistant and working prior to efi fuel/spark tuning.
 
stumble and bog real bad. running suggested set up from carls. talked to curtis today im going to start removing octane and verify my tps settings again.
Im running 8-12k. Im preparing to just return to a single....they just run like twins did on my ol' 99 unpredictable.
 
Did you have any success at all or has it all been bad? Do you have the updates done? What head are you running? What is your fuel combo? ECU? Do you have a fuel controller?

I noticed that I could wein it off of race gas at higher altitudes last year. Hopefully getting your combo right and then making sure the rest of the sled is right will make it work. Once you've felt a strong 800 twin piper done right it's really hard to go back!
 
Lot of good info, I would be wondering what twins would be like on mine? Just don't know if I have the drive to work out the bugs. It runs so good now!! No more Ski-doo problems LOL.
 
Did you have any success at all or has it all been bad? Do you have the updates done? What head are you running? What is your fuel combo? ECU? Do you have a fuel controller?

I noticed that I could wein it off of race gas at higher altitudes last year. Hopefully getting your combo right and then making sure the rest of the sled is right will make it work. Once you've felt a strong 800 twin piper done right it's really hard to go back!

horrible from day one...runs AWESOME on the trail...yes its the updated motor with the decomps plugged. 2010 head cut for 30% by carls. ecu was sent to carls and flashed. no control box. im only going to sacrifice one more weekend then its over.
 
So awesome on the trail meaning starting out you tear but once you get to altitude it won't run right? Or not an altitude deal more of a clutching transmission deal because it runs awesome on the hard pack but once you load the transmission it won't run? Also is it hesitating hiccuping stuttering or is it that it just won't run up to RPM and go fast.

Gang make no mistake that this isn't the old fashion twin is inconsistant or unreliable deal because I ran twins all last year from 4000ft to 11,000 ft without making a single change other then the amount of race fuel that I would run and this application is (or was) OUTSTANDING. We'll get it!
 
So awesome on the trail meaning starting out you tear but once you get to altitude it won't run right? Or not an altitude deal more of a clutching transmission deal because it runs awesome on the hard pack but once you load the transmission it won't run? Also is it hesitating hiccuping stuttering or is it that it just won't run up to RPM and go fast.

Gang make no mistake that this isn't the old fashion twin is inconsistant or unreliable deal because I ran twins all last year from 4000ft to 11,000 ft without making a single change other then the amount of race fuel that I would run and this application is (or was) OUTSTANDING. We'll get it!



fbomb do you have anybody running a 163+ camo ex running twins??? just curious to what you guys had for clutching an weights. my 7 frickin rips iam actually excited to ride it this weekend. reason iam asking iam down to 55.4g heavy hitter weights i know some weights have to be lighter than others to get disired rpms but that just seems damn light. iam only getting 8350 so i grinded some off the weights to 53.3 but i added some weight to the heal with the screws from the kit iam up to 54.2 so hopefully i can get 8500.
also do you know anybody with slp twins for the 700 besides me?
 
Well I can't say at all that I blame him. It's expensive to put money and time into riding and then have a sled that runs poorly just absolutely sucks. I'm interested to find out or hear what is happening so that if it's something that I have experienced maybe we can work out a fix quickly and easily. I've felt the good running twin 800 and the simple facts are that there is no way on earth I'd be satisfied with a single anymore. We have a bunch of really strong singles and they don't really do it compared to the twins when they are right.

I have no experience with heavy hitters or twins on the 7. I'd say attack it conventionally. Mark the clutches and check your shift patterns. Check for heat and fade. You can do a speed calculation to know what your expected speed is for your vehicle and if you are in those realms then fine tune from there. All this assumes your state of tune is peaked or at least consistant enough that you can tune a clutch or visa versa. Super challenging to run pioneering setups without money, time, DEDICATION, and tech skills. Now with where you are at right now if you are getting satisfactory track speed...and your tune up seems right...no excessive heat or radical rpm fade then the only thing left to do is try weight. Of course you can try various helix's or springs but then you have to start over fighting heat (slippage) and transmission of power ?'s again. I'd drop weight check the rest get it where you want the RPM's then compare to a fixed vehicle or timer system as you change for a different setup and seek a quicker a to b sled. Or ride it as is...(:face-icon-small-hap) PHEW
 
well i got 44mph the first day on fresh 0mi motor then the next day i got a 57mph on a rough hill then i got a 48mph so i think iam turning respectible track speed for a 7hundred with a 174 i know the 44mph was true track speed but only at 8350. iam mean it runs good just seems really light my primary spring is a stock 140/330
 
A day of nothing but testing for the 8 twins. After the update I too have chased poor and inconsistant performance. We started over from scratch with a complete, no code, all sensors working in order system. All aspects of the sled are in prime working order from clutching on.

No free riding... no fun...just data logging fuel/spark/RPM and a little clutch work and figuring out what the state of tune really is on this system. BUST OUT YOUR BEST EMMINEM..cause Shady's back@! Sled flat rips again. For example by rip I mean at 5400 RPM, puttering along then hammer down, and have the skis pack 6" and not touch back down until I"m at 8100! That is pulling to speed. Same from a dead still to full 20 second pulls. Out of room after that anyways and you ain't going around any corners when your skis don't touch! Unbelievable performance improvement when you get a minimum of 8400 RPM's on these pipes. I'm down 150-200 from the 50% system running good last year but that is to be expected with the lower compression head. 8400-8500 with dead on state of tune for full out is just fine!

Now hear this...it looks to me like there is more left on the table! I have some heat available from engagement to 7300! What we don't know until we try is how it will react to a tune versus the clutch setup so that there will be a performance positive reaction from a leaner condition down there. There are also valve timing factors and injector circuit timing aspects that may simply require a less then perfect state of tune for those RPM ranges for actual field riding performance. Only field testing would resolve that question. Conventional wisdom would say yea but theory and field response are sometimes different. I'm done with theory (and armed with some info/knowledge) now I'm ready to monkey with application. Irregardless if you ride or rode a single pipe 800 versus this sled yesterday you would be putting on twin pipes. NO BS and super interesting especially if we can make it even better yet (bottom end baby)! Now the other question is will this all work on wildly varying alt's and temps. How much performance drop off will I have when I'm dead on at one condition but need to ride up or down to another? one more Marshall Mathers quote..."testing testing.... your attention please".......looks like it time to dust off the PCV and get started.
BRaaaaaaaaaaaap
 
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