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I HAVE A STAGE ONE SUPERCHARGER FROM MPI, WHEN FIRST INSTALLED IT WAS 6LBS BOOST, I HAVE CHANGED PULLYS AND CURRENTLY 11-12 LBS BOOST. MY QUESTION IS SHOULD I CHANGE BOV SPRINGS? MINE IS TIGHTNED RIGHT DOWN. BUT CRUISING SLOW I CAN HEAR IT FLUTTERING. SO DOES THAT MEAN THE SPRING IS WEAK?

anybody try a reverse helix in snow drags??

Just had a update reflash to my gems, now the altitude compensation mode doesn't work? anybody have this issue? I try to set it and when changing the setting its supposed to make engine stumble and then you go up 2 numbers to set. mine goes all the way to lowest number and doesn't stumble ??

can a stage one mpi s/c boost go up to 16-18 lbs? if so what pulleys are needed and will u need a gems reflash? I emailed MPI but got no response? Looking for more power for drag racing only hoping I didn't need to buy bigger blower @ $2000.

anybody have a used mountain tech heat exchanger for sale ? to fit a nytro xtx?? my 225hp nytro gets hot!!

what are you guys using for primary spring and secondary set ups?? on you boosted nytros

how big of a track lug can u go with on a xtx nitro?

how are u guys getting your nytros to hook up on snow? I have a 09 xtx with s/c I get beat out of the hole almost every time do to awfull trenching spinning I have studs a lot of studs but still spin bad help!!!

anybody know what a 2000 bender clutch kit for a 2000 srx has for a helix?? straight or a multi 53-45??

what would u suggest for the secondary stock clutch set up for snow drags? also should I put the weight in the tips on primary? I have D&d magnetic weights it will pull the rpm with weight in tips. if I take the weight out of the heel and middle will that allow quicker acceleration? I am...

whats a good drag race set up for a nitro xtx s/c 10 lbs boost, its a snow drag. I have D&D magnetic weights. stock secondary. should I put all the weight on the tips? and should I change the secondary spring position? it will hold the rpms with the magnets in the tips only. but I havnt tried...

Wondering what you guys are running for gearing on your supercharged nitro,s (xtx) I have 10 lbs boost looking for more speed.

my s/c nitro, after I changed pullys for more boost, the blow off valve seems to hissing air even at idle. if I tighten the spring what effect will this have. it didn't do this before the change. Thanks for any help

any one have a add on heat exchanger for a xtx nytro? yamaha has a part number for one mounts on the right side in tunnel. looking to buy a used one if possible. yamaha part # 8HA-124AO-00-00

any body have a 23 tooth mpi s/c pully?? or know any other conbo that would get me 13-14 lbs boost

any body have a chart or formula for pully combinations for boost levels?? for a 09 nytro xtx sled

Has anyone else experienced MPI altering your pully order because they didnt have the sizes you ordered? and not telling you untill you installed and found out, your boost is only 10lbs instead of the 13-14lbs you requested?? They told me they where sold out of the 24 tooth pully, and sent what...

changed pullys now running 24-31 which mpi told me would be 13-14 lbs boost. i get only 10.4 lbs this is at sea level. any ideas ?? it was over reving to 9250 rpms i know i gotta get it to 8800-8900 rpms but lowering the rpms will lower boost is that correct?? is this combo of pullys correct for...

anybody have a cooler off a mtx that u want to sell? not the front one looking for the side tunnel one with the hoses. my s/c nytro runs hot! also does any body have the mountain preformance heat exchanger with track studded? wondering about stud clearance? Thanks for any info

i have a stage 1 supercharger on a nytro xtx, having installed the fuel system up grade and going to 13-14 lbs boost. i ride sea level to 700 ft. plan on running 110 or better fuel. what do you guys think? should i be worried about detenation?? Mountain preformance said it should be ok if i...