Viper performance issues at high boost?

thamax · Nov 24, 2015

Who has it and what was there fix? Seems like anything over 7lbs runs like crap for the most part with both mpi and mcx kits. Is the issue in the cat electronics with safe mode coming on sooner when the oil pressure drops?? Is the evops reflash the only solution? I know both mpi and mcx have done nothing to curb this issue. Besides the oil breather reroute? Please keep this thread civil and on topic please!

BigFish BC · Nov 24, 2015

i have ran my boost it viper to 14lbs with strait race fuel & no issues.
my oil light has only come on when i had it upside down so far.
i know alpine motor sports was working on a fix for it not sure how they have progressed on it though.

RACINSTATION · Nov 24, 2015

When you say both kits what do you mean? We are running MPI kits up around 10 lbs, with no issues. Boost-it kits running 7 to 13 no problems.

What issue are you seeing?

RACINSTATION · Nov 25, 2015

Ok, I saw you edited the post so we know you are talking MPI and MCX. Mark Liepheimer is your go to for the MCX stuff. I have run the MPI kits from 5 to 11 pounds with no issues when set up right. We run out of injectors around 10 depending on elevation.

The Evolution re flash will raise the rev limiter, if you are hitting it this will help. I believe they now have an over ride in the ECU to keep the oil pressure switch in check. We have plug in kits to over ride the oil pressure switch if needed as well.

thamax · Nov 25, 2015

RACINSTATION said:
Ok, I saw you edited the post so we know you are talking MPI and MCX. Mark Liepheimer is your go to for the MCX stuff. I have run the MPI kits from 5 to 11 pounds with no issues when set up right. We run out of injectors around 10 depending on elevation.

The Evolution re flash will raise the rev limiter, if you are hitting it this will help. I believe they now have an over ride in the ECU to keep the oil pressure switch in check. We have plug in kits to over ride the oil pressure switch if needed as well.

plug in over ride kit?? who makes it and cost?

RACINSTATION · Nov 25, 2015

It is one of our new Boost-It Viper products. $79.99 and Ill have some more available in about 10 days.

bigbird · Nov 25, 2015

Boost it Viper 12-13 lbs, no issues

Prairie Dog · Nov 26, 2015

RACINSTATION said:
It is one of our new Boost-It Viper products. $79.99 and Ill have some more available in about 10 days.

Can you give a little more info on how it works????

TBird · Nov 26, 2015

thamax said:
Who has it and what was there fix? Seems like anything over 7lbs runs like crap for the most part with both mpi and mcx kits. Is the issue in the cat electronics with safe mode coming on sooner when the oil pressure drops?? Is the evops reflash the only solution? I know both mpi and mcx have done nothing to curb this issue. Besides the oil breather reroute? Please keep this thread civil and on topic please!

What are you saying, does the oil light come on or have you turned the boost up without adding fuel so the engine starves and run lean?
You know MCX have a 270hp kit?
So 7 lbs isn't "high boost", but it's to high for the oem fueling as in stock injectors and/or stock fuel pressure.

thamax · Nov 27, 2015

its not a lean condition seems to lose power when the motor goes into safe mode only see it happen when the sled is standing on end wide open at 8600-8700 rpms. I run 100 octane at 10 lbs on my personal sled and several vipers ride with do the same thing

RACINSTATION · Nov 27, 2015

Is the ! or low oil light flickering when it cuts out?

thamax · Nov 27, 2015

it would flicker before the oil breather reroute now the light doesn't come on at all.

BigFish BC · Nov 27, 2015

Prairie Dog said:
Can you give a little more info on how it works????

not sure if they want to tell people how it works, since they are the only ones with it but,it will make your viper work like the nytro system did.
neil said you should run a tether with it though,just call the shop your not far from them,they mite tell you how it works, but it basically controlls the oil pressure switch.

thamax · Nov 29, 2015

guess we will wait until racing station can sell this over ride kit.

christopher · Nov 29, 2015

thamax said:
guess we will wait until racing station can sell this over ride kit.

Hopefully you won't have to wait very long

thamax · Dec 4, 2015

RACINSTATION said:
It is one of our new Boost-It Viper products. $79.99 and Ill have some more available in about 10 days.

So its been 10 days can we buy this override kit yet?

thamax · Dec 8, 2015

RACINSTATION said:
It is one of our new Boost-It Viper products. $79.99 and Ill have some more available in about 10 days.

Is the over ride plug in kit for sale yet?

RACINSTATION · Dec 8, 2015

Yes

http://www.theracinstation.com/Yamaha-Viper-Arctic-Cat-M7000-Oil-pressure-bypass-detail.htm?productId=-3549680&catalogId=-1970&fpg=1

thamax · Dec 16, 2015

several rides now on the oil pressure override and seems to never miss beat wide open! runs like it should!

Remmy · Dec 16, 2015

My understanding is that this "fix" just fools/bypasses the sensor....perhaps a resistor??

That's why the Tether is crucial. With the override in place the motor will destroy itself rather than shut down in a low oil/pressure scenario.

Viper performance issues at high boost?

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