MCX mid-mount help needed

[mahaman]

We have been building a 2006 APEX for the Asphalt with an MCX - mid mount turbo. We upgraded the crank, rods, pistons, cam, etc - and can not get the thing to run on boost. On the dyno, the sled runs great on motor, but when we add boost and get to about 7 to 9 pounds, the #4 cylinder goes lean, then way rich and starts missing. We are using an MCX box, and have adjusted the mapping both directions and end up with the same results. We have tested for leaks, checked all the wiring, changed out injecters, etc - and everything checks out well. We have been in contact with the folks in Sweden, however lately they do not seem to be very responsive. Before scrapping the MCX system and going with a more local system from Wisconsin, anyone have any suggestions on what could be causing this issue - or have seen this issue before?

 

[snowy1]

do you have access to another mcx box to try and see if thats where the problem is, strange its only on one cylinder,

 

[mahaman]

Thanks for the reply. I do not have another box to try - tried to get in touch with MCX to locate something to swap out - either through a distributor locally or in Canada - but have not recieved a response.

We have trying to eliminate this issue for the past 9 months - and I agree it seems strange it is only on the #4 cylinder. THe kit was new from MCX when it arrive, so I am not sure the ECU box is working correctly - and given the fact we have changed mapping to try and eliminate the issue and end up with the same problem, we are honed in on the ECU. Do you know where to get one locally - in the states - that we can swap out and see if that is the culprit?

 

[snowy1]

Try Leipheimer yamaha in butte montana, ask for Mark they are the US distributers for MCX, hopefully he can help. phone # 14067824225.

 

[mahaman]

Thanks - that is who we bought the system through and have been working through to resolve this - everyone is stumped on the issue - which is why I am considering changing out the entire system. I will call him again tomorrow. If anyone else has any ideas it is greatly appreciated.

 

[mbarryracing]

Scrap it, call Justin at Full Power Performance, you'll be farther ahead by not goofing around anymore with that system... But you aready know that

I think a few of his customers finally realized how dedicated he is to them this weekend at Big Moose Yamaha... If that were his system that you were monkeying around with, he wouldn't sleep until it ran like it should.
Customer support, baby!!!!

Of course, if that were his system, it would have pulled HP right off the trailer onto that dyno!

OK, on the serious side, you have an air box / air flow issue with that intercooler design. You won't realize it until you dyno it like you did...

 

[mahaman]

He has been helping with this - he had it at the dyno for 2 days trying to help work through the issues - always comes back to the same problem. I think the last option is to try a different box before changing entire systems - so I am trying to locate another MCX ECU box.

 

[mbarryracing]

He has been helping with this - he had it at the dyno for 2 days trying to help work through the issues - always comes back to the same problem. I think the last option is to try a different box before changing entire systems - so I am trying to locate another MCX ECU box.

Yeah, try swapping a different ECU if someone will lend you one for troubleshooting purposes. Hope that will solve this for you, but wouldn't be surprised if you have to change that airbox.

Keep us posted.

 

[mahaman]

Thanks mbarryracing. His customer service has been fantastic - and I made the mistake of not buying the system locally. That being said, I still need to exhaust all efforts to figure out how to get it to run correctly before switching. I am hunting down another ECU box.

The airbox issue you are referring to, would it affect only 1 cylinder? If you can, give me a little more detail.

Thanks

 

[mbarryracing]

Thanks mbarryracing. His customer service has been fantastic - and I made the mistake of not buying the system locally. That being said, I still need to exhaust all efforts to figure out how to get it to run correctly before switching. I am hunting down another ECU box.

The airbox issue you are referring to, would it affect only 1 cylinder? If you can, give me a little more detail.

Thanks

I think the guys you had thrashing on that at the dyno did ALOT of great 101 troubleshooting, from what I observed on the DynoTechResearch webcam that day...
Seems if it was a controller, or fuel system issue, it would have followed when they swapped injectors and wiring. Seems like that cylinder is getting ALOT more air than the others at that problem RPM?

I agree with you, you have no option but to continue to swap the remaining MCX components with ones that supposedly work.
You have to get with someone who has successfully dyno'd one of these. I've never seen a private dyno result of one yet. This might be an inherent trait of that system, guys could are blasting around on them with this issue and don't even know it...

 

[mahaman]

Thanks - Found the post on Dynotechresearch.com. I am going to hunt down another ECU box and try that - and if that doesn't work try something different with the airbox / cooler. Then if no luck, get a different make of kit.

You could be right on the kit - I know there are not a large number of the MCX mid-mount kits (mounts where the fuel tank is) out there so the problem may not be widely recognized - which may also be why it has been so difficult to resolve. The sled is complete except it won't run right - expecting roughly 26+ lbs boost with C16 - with the MCX kit or another make.

I may end up picking up a different turbo kit where I can get better local support and running that, while I figure out how to get the current kit de-bugged. After 9 months of trying to get the MCX kits running right we may need to just change dirrections with another kit. I have investigated Simons CPR race kit and they seem to have better support.

 

[mbarryracing]

9 months? You've got to be kidding? Your a patient man.
That kit will run, with help. Actually anything can be made to run with talent, lots of time and $$$, unfortunately.

Can't dispute using local service and tech help.

Yeah, DynoTechResearch is the place. They have proven out alot of different boosted setups there. What you learned there was key.

 

[mahaman]

Wish I was kidding about the 9 months - but am not. We changed out everything - sensors, took the motor back apart to re-micro everything, re-wired, re-clutched, re-mapped - same result. Unfortunately I think I might be better off now spending additional money for a similar kit with local service. If I don't have any success fixing the current system by the end of this coming week a new one will be on order. Don't want to miss the upcoming asphalt season.

 

[mbarryracing]

Wish I was kidding about the 9 months - but am not. We changed out everything - sensors, took the motor back apart to re-micro everything, re-wired, re-clutched, re-mapped - same result. Unfortunately I think I might be better off now spending additional money for a similar kit with local service. If I don't have any success fixing the current system by the end of this coming week a new one will be on order. Don't want to miss the upcoming asphalt season.

So you've just answered it for yourself. You've tried everything but modifying that funky airbox. I may be wrong, and someone will for sure correct me, that the MCX supplimental injectors probably all fire at the same time? (non sequential) And when they swapped those around at Dynotech it didn't follow the injector but stayed with that cylinder? If the same cylinder is lean, one could be fooled into thinking that the ECM isn't that smart to consistently pick the same cylinder...

 

[Climbmax]

http://www.ty4stroke.com/viewtopic.php? ... +mid+mount

Is this the kit you have?
I have run mine for almost one year. Only problem is the Tial Wastegate that caused me a problem controlling boost. I ripped the diaphram but no big deal.

Catalogue your wiring harness into the box and let me know......I will check mine to confirm they are the same........Buddy found one that was 180 degrees out and it caused issue!!

RS