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viper eabc boost backwards

M
Feb 25, 2008
570
49
28
Creston B.C.
Bought sled new last year at the end of the season. 2015 viper mtx 190 Yamaha acc turbo kit installed by dealer. Not a lot of snow to play with last year so now that I'm riding this is what ive noticed. Boost seems to be high at 2000' 7psi was more I dropped it.**And lowers as I go up in altitude 5psi at 6000'.* Also it seems to run crappy after it is warmed up and sits for a bit. After I run it for a bit it clears up maybe 1/2 km down the raod. Temps outside were cold probably -10. I have looked and all plumbing seems to be ok.
 
S

stingray719

Well-known member
Jan 22, 2008
1,698
670
113
Colorado Springs, CO
stingraymods.com
Bought sled new last year at the end of the season. 2015 viper mtx 190 Yamaha acc turbo kit installed by dealer. Not a lot of snow to play with last year so now that I'm riding this is what ive noticed. Boost seems to be high at 2000' 7psi was more I dropped it.**And lowers as I go up in altitude 5psi at 6000'.* Also it seems to run crappy after it is warmed up and sits for a bit. After I run it for a bit it clears up maybe 1/2 km down the raod. Temps outside were cold probably -10. I have looked and all plumbing seems to be ok.

Not trying to be a smart azz but call MPI would be my suggestion -*http://mountainperformance.com/support.htm
 
M
Feb 25, 2008
570
49
28
Creston B.C.
I have emailed them but I have had no reply . I assume it was because of the holidays. I will try calling them this week just trying to figure out the problem.
 
Last edited:
M
Feb 25, 2008
570
49
28
Creston B.C.
All my stuff is on its way back to me. But every thing tested good. Hopefully it was just a poor conection. He did mention that some have a flash in the ecu that keeps the #1 injector on. Any body know about this? Going to find out if they flashed the sled before I picked it up.
 
M
Feb 25, 2008
570
49
28
Creston B.C.
Well had it out again today. And still as I go up boost drops. I unplugged the eabc and it will not build over 5 psi. Gonna have to call mpi again. Gotta be something in turbo recirculation valve maybe or turbine it self. It just will not compress air at higher altitude. It starts to drop off about 4500'.
 

sidehil

Well-known member
Lifetime Membership
Nov 29, 2007
681
153
43
Federal Way
Call MPI, my kit has been flawless but I installed at home, they are a good outfit period!
 
M
Feb 25, 2008
570
49
28
Creston B.C.
I have contacted a few times not the problem. They have been good. Might have found the problem now. Air box has a popped weld on one of the throttle body spouts. Going to have it welded up today and try again hopefully tomorrow.
 
M
Feb 25, 2008
570
49
28
Creston B.C.
Well still having the issue. All the electronics were tested and ok. I found a boost leak and it is fixed. Still can not figure out why it is boosting too much at low altitude and not boosting enough at high altitude. Will run 8 psi at 2000' and 5 psi at 5700'. MPI has no idea why they are trying to figure out as well. But any other suggestions would be great.
 
M
Feb 25, 2008
570
49
28
Creston B.C.
Well after riding in sicamous it is still building more boost at lower elevations than high. 1500' on the trail up to eagles and it would pull 7-8 psi* and stay there but at the cabin 6000' 5-6psi. So back to try and figure out why it is doing this. At least its not running 11psi down low any more. Going to run it without the eabc hooked up and see how it runs.
 
M
Feb 25, 2008
570
49
28
Creston B.C.
update

Just to post what I've found. It is not a problem with the eabc. The problem is from the turbo not being able to build boost at altitude not sure why yet. Not boost leak, and not leak in the header. Turbo is sent to mpi but not sure if they are going to warranty anything yet. He said it looks like the impeller has rubbed the housing. I hope so, it's been like this since new.
 
M
Feb 25, 2008
570
49
28
Creston B.C.
Not sure what happened but seems to be working. They checked and pulled it apart(not sure how far) inspected. All was fine, ran on another sled worked perfectly. Got it back installed and it all seems to be working fine now. Lots of turbo chatter up high now like its supposed to. Now I have to redo clutching over revs a bit on take off up high and down low. Try it again at a bit higher altitude with longer pulls know for sure.
 
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