What boost are you seeing on your MCX180 Nytro's?

[Dimebag]

Both me and my riding buddy installed MCX180 kits on our Nytros before this season, both at the same dealer. We also have the same boost gauges installed.

Problem is we are only hitting 4 psi on sea level, and the boost does not seem to increase at elevation either.

Both sleds runs great and I would'nt doubt a second about that there is 180 hp in it.

What boost levels are you seeing on your 180 kits, at wich elevation?
Also, have you adjusted the boost anything, or is everything "stock"?

My buddy just came back from a test ride today and I'm sure he will chime in with more info when he gets online.

Thanks.

 

[ntm_08]

On my first trip i saw up to 5 psi and my 2 trip at 2700ft it was down to 3-4 psi.

Yes i was out driving today, saw only 3-4 psi at sea level. Runs great, it is way stronger then stock

People say that the pressure drops on the first trips, anyone else have experienced this ?

Some have had to drop pressure and some have increased pressure to reach the 6 psi sea level pressure that this kit is made for.

We just want to be careful, do not want to make the engine run lean as the stock fuel injectors is safe to 180hp.

Thanks

 

[HYFLYR]

First of all what kind of boost gauge are you running? Does it need to be zero'ed at sea level?

Then, you can shorten your rod to make it 6lbs of boost at sea level. No, you shouldnt drop pressure the first few trips or ever with the kit. Also, kit should raise boost up a lbs every 2k feet or so, not loose boost so check to make sure your tcv valve is plugged in or your wires are not broke to it. Make sure your thorrle bodies and plenum are on and not leaking as well or have any leaks in the system.

 

[ntm_08]

First of all what kind of boost gauge are you running? Does it need to be zero'ed at sea level?

Then, you can shorten your rod to make it 6lbs of boost at sea level. No, you shouldnt drop pressure the first few trips or ever with the kit. Also, kit should raise boost up a lbs every 2k feet or so, not loose boost so check to make sure your tcv valve is plugged in or your wires are not broke to it. Make sure your thorrle bodies and plenum are on and not leaking as well or have any leaks in the system.

No name gauge.
Showing -7 psi at idle, so i think it is 0 to sea level.
Just that both sleds have the same kit and same boost gauge.

Maybe it`s the gauge, will buy another one to be sure before adjustment.

 

[ntm_08]

Update:

Gauge shows -1.5 psi at sea level.

 

[Dimebag]

What you mean is that the gauge shows -1.5 psi too little while driving,
and it shows -5 psi at idle.

 

[HYFLYR]

Im a fan of a mechanical boost gauge, liquid filled. Its easy to read, simple and generally straight forward. I run the auto meter liguid and works great and is easily calibrated for different altitudes.

You are probably seeing vacuum at idle, which is normal but once on the gas it should zero itself and raise from there.

 

[Dimebag]

Should the boost gauge see "more vacuum" when idling at higher altitudes than at sea level?

Is it possible that we see more vacuum, and the same boost on sea level and on the mountain. That the readings are "correct", only that the zero point is wrong?

ex.

On sea level i see -0.3 Bar when idling, and 0.3 Bar when boost builds up.

On altitude i see -0.4/-0.5 Bar when idling, and 0.3 Bar when boost builds up.

I may be totally wrong on this but just want to make 100% sure before we start adjusting the boost..

Thanks!

 

[Dimebag]

Update: Was riding at 4500 ft today, and still There is no increase in pressure. The gauge shows 6 psi at all altitudes, and it decrease to 4 psi when prefilter ices up. Any ideas guys? Is it possible that the TVC altitude compensator is'nt working properly? We are seeing the exact same thing on both me and my buddys Nytro. Thanks!