Evo Reflash With MCX Turbo

[Martens199]

Yes. it's currently unplugged. with it plugged in it shoots the boost back up to 8psi with or without the spring I installed.

I would bypass the air line through the tcv (remove it) just to make sure all your dealing with it is straight from the compressor to the wastegate. Then turn your rod all the way out on your wastegate and test.

 

[Dealerjohn]

I have the tcv unplugged. not sure what you mean by the air line going to it. the air lines go to the actuator and the fuel controller. it doesn't go to the tcv. the tcv gets its signal from the fuel controller.. if I disconnect the line going to the fuel controller I will run lean. maybe I'm missing something?

 

[machzrobbie]

Below is a picture of the turbo with the tcv (black solenoid) in the hose from the compressor housing to the actuator - remove the tcv completely and hook the hose from the housing to the actuator directly.

Then lengthen the rod as loose as u can with so it will just fall on the pin on the waste gate arm. You usually want at least half a hole of tension on it - but if you can't get it down - lengthen as I've stated to test. When doing this make sure waste gate is free and linkage will travel without binding, opening the waste gate. If the boost is still to high - and the hose is ok, the actuator spring is too stiff. You'll have to get a softer actuator - universal actuators can be purchased online.

 

[Dealerjohn]

Wow.. I can't believe I or anyone else didn't think of that. I'm waiting for my new O2 sensor to show up.. as soon as it gets here I'll try this a let you know. Thanks a lot you guys!

 

[cannondale27]

Thanks MachZ!

 

[Martens199]

Sorry haven't been on for a while.
Thanks Mackz for summing it up, that is what I was trying to say. Maybe you got your air lines mixed up. I'm thinking that's your problem.

 

[Dealerjohn]

I have the air line going from the turbo housing directly to the actuator Now, completely bypassing the tcv. I'm just running out to get some fresh gas then I'll try it. hopefully this works.

 

[Dealerjohn]

Martens199, and machzrobbie I can't thank you enough. I did as you said, and I'm at 5 psi on the boost gauge. So now I'm going to slowly turn it up. Why Erik at MCX, or any one of the MCX dealers didn't think of this is beyond me. But whatever.. I was all last winter trying to figure this out and it ruined my entire winter honestly.. I am very excited for this winter now!! I even bought a Polaris 800 SKS to use because I thought I was going to sell the Viper. I guess I have two sleds now! haha. Thanks you guys so much. I wish I could thank you in person.

Last winter I found lots of guys who had the same problem as myself and still had not found a solution, I'm going to message them with a link to this page so they can try it and hopefully fix their sleds.

 

[cannondale27]

Thank you guys for helping out! Glad you got it right Dealerjohn perseverance always pays off. 2 more mechanics of the month for sure!

 

[machzrobbie]

Martens199, and machzrobbie I can't thank you enough. I did as you said, and I'm at 5 psi on the boost gauge. So now I'm going to slowly turn it up. Why Erik at MCX, or any one of the MCX dealers didn't think of this is beyond me. But whatever.. I was all last winter trying to figure this out and it ruined my entire winter honestly.. I am very excited for this winter now!! I even bought a Polaris 800 SKS to use because I thought I was going to sell the Viper. I guess I have two sleds now! haha. Thanks you guys so much. I wish I could thank you in person.

Last winter I found lots of guys who had the same problem as myself and still had not found a solution, I'm going to message them with a link to this page so they can try it and hopefully fix their sleds.

You will love the sled once you have it running properly. You could put a maneual boost controller in that line and adjust it

 

[Martens199]

Awesome glad to be of help!!
Yup, now just get a manual boost controller and tee that in the line. First set psi to just below the level you want by adjusting the wastegate lever. Then install the controller and crack your boost back up with your dial and you are set!!

 

[Janne339]

What is wrong when it did not work with the TCV?

 

[machzrobbie]

Boost pushes on the diaphragm against a spring and opens the waste gate to limit boost, with the tcv hooked it vents some of the boost pressure to increase boost from the base setting. When the tcv isn't venting full boost opens the waste gate, the controller pulses the tcv to control boost. If the tcv doesn't seal properly the boost would go up.

 

[gsxr]

I had a similar problem , tested tuned for three weeks , double checked gauge , was the Autometer gauge and replaced it , all ok now for 24000 km Apex MCX 295