MCX electronic boost controller issues

[Thistledoo]

Well I have only been out a couple times this year and I have been fighting boost issues....it seems to be all over the place mostly with it being to HI! I have been runing 12lbs for ever and I like having it be a consistent 12lbs....is there any way to test the MXC electronic boost controller? Also what about the electrical side?? 12volts or how much voltage should I see? Today it would spike way above 15 and it was deep riding so I removed it left it plugged in and just connected the 2 hoses together and then adjusted with the rod to get back to 11ish...so at least I could hold it clamped
Anyone got any ideas or what to check?? I just would like to get it back to how it was thanks

 

[0007]

Mine did that and the TCV was stuck open, can you blow through yours?
It should not pass air out the open side

 

[Turblue]

I was thinking maybe pressure test the lines to make sure there is no leaks on the hose going to the actuator

 

[Washy]

Mine never did work right. Took it out and put in a Hallman. Problem solved. From the trailer, what does it say for Boost??? If it reads 12 psi at the trailer it should read around 14 psi up high it is working properly.

 

[mtnmodviper]

I also took mine out and replaced it with a manual boost controller. It works much better.

 

[Thistledoo]

Thats the thing....it has worked perfect for 2 years and I like it. Yesterday from the trailer I couldnt hold it becasue the boost was way to hi plus the rev limiter was on alot. Does anyone know exactly how it works? Must be a variable orifice depending on voltage? I dont want to give up just yet as it has been dead on for 2 seasons....

Ans yes I can blow thru it but are doesnt come out the third drain fitting

 

[Sammy]

Eric at MCX would be your best bet for info on the operation or troubleshooting of the tcv. Lately he has been good at responding to emails. I agree current probably controls a solenoid in the tcv to control how much boost the valve bleeds off, it's these values you would be looking for. I like many have replaced it with a Hallman and have just left the tcv plugged in and coiled up out of the way. If these can be unplugged and run with no problems then you are welcome to mine at no cost as it has barely been used. Mine is fron a 2007 apex but i believe the kit is a 2008. I am probably going for a ride this Saturday so i can test to see if the sled runs okay with it unplugged. If interested let me know.

 

[Thistledoo]

OK thanks for the info...if you think about when riding try unplugging it and see if that works....If I find out that it is NFG I would like to replace it like I have said....it has worked flawless for 2 seasons and I would like that back!

 

[summitboy]

Thistle do you have an a friend with a kit, maybe you could try his out and see if it smartens up. I'm not sure if mine is the same as the Nytro kit but i don't use it anymore just a Turbosmart controller. If it is the same you can try mine out if you like.

 

[Thistledoo]

I happen to have one in the garage as we speak....so I will bring it along next trip to try....then I guess I will know for sure if its the contoller its self

Anyone have a base line measurement for the waste gate rod? Mines has been fawked with lots latley....like how far to pull it before it drops onto the pin? one hole width?

 

[Thistledoo]

well the wiring checks out...at least not a broken wire in the 2 wire harness. Guess I will have to play on the hill some more...just wish i could test it in the garage some how

 

[Nytroman]

Mine would hold 12 psi at home and still 12psi at the hill, never increased like some said it should. I had some spiking with it in cold weather one trip. I purchased another TCV but it never helped. I installed a Turbo Smart but have not had a chance to try it. Worried about freezing.
Have a new TCV if that is what you need.

 

[Sammy]

well the wiring checks out...at least not a broken wire in the 2 wire harness. Guess I will have to play on the hill some more...just wish i could test it in the garage some how

Thistle i ran my sled on the weekend with the tcv unplugged with no issues. In my last post i had stated it was hardly used, not a true statement as it has been plugged in just not connected to the actuator. There are 1600km's on this one and you are welcome to it. PM me if you are interested.

 

[Thistledoo]

I remember when the nytro MCX kit came out and I thought for sure I read a few times it had to be plugged in....weird I have another from a friends sled and will try it to rule that out and if that is the problem which it has to be....if you dont mind....I dont want to leave you with out one

 

[Thistledoo]

ok was out this afternoon for some nytro testing as we just finished installing a 270 MCX kit on a buds sled and it ran flawless. Mine is still making to much boost...remember mine is the 240 kit with no extra fuel pump ect. With my tcv it would stay at 17lbs if I let it.....so I took it out and tried the one from the other sled (brand new kit) then it dropped to 15ish lbs (this is all at 3000 ft) so then I removed the tvc all together and just connected the lines together....then I had 13 to 14lbs which was where I wanted. So I'm stumped...for some reason its not sensing the correct level of boost. COuld it be my sliver MCX box? Get it remapped? any other suggestions? I guess I could have worse problems than to much boost....but I just want my 12 to 14 back

 

[Washy]

If the other TCV worked fine, the problem could be your waste gate actuator. The bellows inside could have a hole in it. This would cause it to bleed air through it and would affect the pressure at which it would open your wastegate. Try that. If you can put air pressure to it and see at what pressure it opens at. Could be your problem.

I dont think it is you MCX box as it would POP and would pop and studder if run at WOT and the box was not working. The lean popping is very distinct.

It was originally stated that the TCV had to be plugged in but, I asked MCX-USA if it did and he says NO it does not need to be plugged in.

 

[Thistledoo]

but when I eliminate the tvc and connect it runs at 13 to 14....if I had a hole it wouldnt do this would it?

 

[Washy]

OK, so it was originally running 12 psi and now connected direct it is running 13-14 psi. So there would seem to be air bleeding off somewhere. If connected direct and running 14 psi then connecting the TCV IMO would cause it to run 17 psi in the mountains. That seems to be working right to me. The TCV would try to increase the boost by 3psi beacuse of the altitude. It is in your base actuator setting that is the problem. And since you did not change the wastegate rod before the problems then it would tell me that possibley the actuator could be leaking air. Just a thought.

 

[summitboy]

Im not sure if the Nytro is like the Apex but there are a couple of lines running from intercooler and BOV etc. There is also a line that runs to a little sensor. Are these lines clear of water ? I know on the Apex some guys had issues with water in these lines. I never have had the issue but maybe just a thought. I'm sure you have thought of this already and had your sled in your nice heated shop. Try another MCX box if possible ???

 

[Thistledoo]

So your thinking I have the rod to tight? Washy the tests today were at 3000 ft. I tightened the rod last ride so I could get 12ish on the hill to ride....which is 6000 ft ish.....The other night I put air to the wategate acctuator just to see if it was smooth and it all looked good....weird I'm riding tom so I will do some more testing and see what happens. Thanks and keep the ideas rolling