put your stock box back on and see if your times o-50 is faster. im not trying to be a smart a$$. im just being smart. give it a try. also polaris 700 is a boat anchor. i can out run a 700 with my rzr. and i can hang with a 800 up to 35mph. if were in the woods the 800 cant keep up. the only thing that you got from the mpi box is higher rpm. the timing curve is set up to help the rzr reach 7000 rpm. the only thing that i can see that thay might have found is a little advance timing on top end. i think polaris built the stock box to be advanced alot coming out of the hole and up to about 40mph. but the stock motor wont even hit rev limiter going down hill. 6820 rpm is all i could get. if your out running stock rzr's 0-50 mph its your hole shot that is puting you in front. pipe will give you bottom end torq if its tuned. and clutch mod lets you engage at a higher rpm. this gives you a better hole shot than stock. jonny's vidio showed all of us that 0-45 mph was about the same on both rzr's. if i had to bet on why one was faster that the other i would bet one got a better hole shot.

Yeah MD the Suzuki 700 did much better...like I said I am 8000 miles away right now and won't be home until Valentines Day...We are going to do some swapping of ECU's and testing in the near future...All I can post is what I have for now and thats 0-50 mph...when drag racing we were hitting 6500 on mine which didn't hit the Rev limiter...hopefully a few more drag runs with a Clutch Kit installed and the Air & Fuel dialed in will give me a little more...I have the LTE TFI turned up to the max on all of the first three settings for now....stock clutch is probably slipping a little right now and I know another guy that dialed in his Air/Fuel and it gave him a nice surprise...don't be too quick to judge MPI...we have already seen a stock ECU that wouldn't advance but up to 28-30° and they should advance to 35° or more...this RZR had Polish & Port, Power Commander, DDP Cam, but he was having flow problems on his exhaust and air...Does yours leave 7-8ft black marks on dry concrete? I am going to try and get a video of mine pulling the front tires off the ground....

like i said the mpi cdi wont change your bottom numbers. no my 27inch mudlights dont spin much at all nor do i want them to. my clutch works great. if my box comes back and has a better hole shot than it will prov that there is timing advance avalible at the bottom. i dont know when this engine starts to detenate. and mountain couldent tell me. thay were asking me were i wanted the timing to be. i told them if i had time and money to figure that out i would be selling cdi box's. how do you know that theres 35 and what rpm is this at. is there enough cam deration to allow this.

lol i can lay rubber in mine real good too but only about 7 ft i have the lte ex also love it but im hitting the rev limiter on mine.... my front end almost comes up i can lift it if i come up my driveway and hit it but thats cheating and it only comes up a few inches...lol

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2006 silverado 2500 hd
2006 additude toy hauler
2008 polaris rzr
2006 suzuki ltr450
2005 kawisaki kfx700
2003 suzuki z400
2003 honda ex250

opps i forgot i also have a clutch kit too

thats my point johnnycat8 the bottom end power will be there with or without mpi cdi. i could be wrong but i think the stock box is all ready advanced at the bottom. it feels like 0-40mph is were the timing advance and the cam duration is strong.

I can't wait to get my clutch in...I hope it will give me some more low end pull....

Cartwheelin just did a nice article as they added and removed each performance part. Good stuff

after mac got done feeding me his mountain of bul$hit. i made my mind up that mountain perfomance is a bunch of wana be's. mac treated me so bad on the phone if he had the best thing going i wouldent buy it from him for the best price. it dont do you any good to buy the best for the best price if the a$$hole selling it to you dont back it up. $399 to $699 is alot of money to pay. only to have the guy that programed the box take 15 days to try and make the box do what he featured. than offer to ship by ground for free. and than tell you to pay shipping our he will switch the program on you. i do not trust mac or anyone else at mountain perfomance. also mac is the programer for hot seat hotride4u utv crap and any other company that fell for his mountain of bull$hit. utv crap video clearly shows that macs featured program is a mountain of bull$hit. i do have to say that jerit did try and i think he ment well. but when you work for a A$$$HOLE what can you do. if someone has a job opening jerit needs a good boss. trust me jerit you have what it takes. and you can do alot better.

I just have to say it again. dont deal with mountain performance. you cant trust people that want to hurt you for there mistakes. mac from mountain performance is full of a mountain of bull$hit. and he wants to put his stink on you.

MD really sorry to hear that...it's true most of the item's out there on the market are "snake oil" at best...we will get back to you on the test between my stock and the MPI as soon as I get some time and let you know exactly what it does or doesn't do for our RZR...MD your 27" Tires are probably killing you on any kind of speed mod's...I had 26" PXT's and I couldn't bump the Rev Limiter on the MPI unless I was going down hill or was in Low...I made the swap to 25" GY MTR's and I hit the Rev limit at 61-62 mph...it runs much better and is quicker...I weigh all my tires and rims and keep tabs on rotating mass...I am now going to ITP C-Series Type 6 Rims as the Vision 159's I have on are 12-13 lbs apiece and the ITP's are 7-8 lbs each...
If you can't hit the Rev limiter fairly easily you are not using all of the available power from your engine....
Have you got a Clutch Kit installed for the 27" Tires?

ltz470 a clutch mod would help me pull a hole shot a little faster. maybe two tenths of a second.this is due to primary wont close as fast due to higher spring tention. it take more rpm speed to rotate clutch weights fast enough to have enough force to push primary clutch spring down and grab the belt. this spring is a stall spring. after the tires are rolling its job is dunn. all though if you let of throtle and let rpms fall low enough it will do its job again. (some belts are braking without speed limiter spacer hmm) not sure but may have somthing to do with it. anyhow the secondary clutch spring is stiffer so it will release faster and keep rpms up and it will take longer to push the belt up the clutch sheve. keeping it in a lower gear longer. so to speak. this will give me a little better control of max hp at the tire. not hp gains i still have the same hp. if i put a clutch kit in my rzr it would do the same for 25 inch tires. the box is not giving you any hp gains its letting you get to a higher rpm. if your exhaust mod was making power at the top you would go faster than 62 mph. my rzr go's 62 mph with a higher rev limiter also. yours is gitting there faster because your pipe makes hp out of fuel air mixture faster than stock. if i was you i would try to get more air to my engine and see if my top speed go's up. you need to keep going up with the air and fuel mixture until the valves cant take any more than back it down a little. a clutch mod will only give you a hole shot and help control avalible hp. if this box is advancing spark its only one degree so he can say it will. and that could be light detenation. due to the person mac is i dont trust him. if you know more than that about the clutch im listing. please tell me all you can im not a clutch guru. and i would love to know more. im not sure but i think the secondary is spring loaded and the primary pulls the belt agenst the secondary spring tention and down the sheve for a smaller gear ratio. and this is how the clutch shifts. do you know alot about the clutch helex. i need to know more.

md,

I installed this breather system...it works a charm for me and my b&tt dyno said a little gain...
PRC Forum - Air Intake change out to K&N Apollo

The clutch is greek to me: I am slowly understanding and like most everybody trying to leech info...I am installing the EPI Kit designed for the LTE Duals, Controller..air mod...
I will lose some top, but I have rarely been to 50mph in the dunes and when drag racing thats about as fast as we get until we have to slow down on the strip we run...
I could really tell a big difference when I installed the 25" GY Rawhide MTR's in place of the 26" PXT's (Maybe stock clutch was having a hard time with the PXT's?)...I got the ITP C-Series Type 6 Wheels on the way (7.5 lbs each)...I just wished they had 8" wide rims for the rears...they will take off an additional 18-20 lbs of unsprung weight...
Will give an update once I complete everything...
Installing the K&N Apollo CIS Part No RC-5052Ab was really easy even going through the fender wasn't bad at all...worth all the gains...it runs like a top...
I haven't removed my spacer on my clutch either...
Alba Action is getting 50hp+ to the rear wheels now but the crank is wobbling (orbitting)...they modified and installed a center crank bearing and are running it now for test runs...thats where I am going next....