MCX nytro upgrade kit

[supraturbo]

Oooooboy, here we go again!!
Several here in Sweden installed the upgrade last spring, and i have run with a couple of them, they run hard, and with ZERO glitches.
The fact: Premium fuel, Fuel preassure regulator, External fuelpump, Reflash of ECU, 17lbs, ~270hp.
The not: 20lbs requires high octane fuel or a PCIII with ignition module, 19T is in the MCX350 kit to the Apex, not the Nytro.

just a head shim, 17 psi with 91 octane......not 92 or 93 but 91 octane.....with simply a reflash of piggyback??? someone looking for trouble for sure....not maybe but for sure! even with a 8.5:1 compression ratio i would not run 17 psi with 91 octane......would risk it with 98-100 octane

 

[TBird]

Hi guys, i just checked with one of the them that installed the upgrade last spring, he runs 16lbs in his, but he also have heard that he can run 17lbs if he wants to, but he is a very precautious gentleman and thinks ~260hp is good .

 

[TBird]

just a head shim, 17 psi with 91 octane......not 92 or 93 but 91 octane.....with simply a reflash of piggyback??? someone looking for trouble for sure....not maybe but for sure! even with a 8.5:1 compression ratio i would not run 17 psi with 91 octane......would risk it with 98-100 octane

Are you saying that MCX has a bad reputation with many failures???
This is tested, many many miles, but for sure the margin must be closer then ever before, but still within the margin.
My friend that only runs 16lbs often fill gas in smaller gasstations that sometimesmay have some "not so good" fuel in the Premium pump.

 

[supraturbo]

Are you saying that MCX has a bad reputation with many failures???
This is tested, many many miles, but for sure the margin must be closer then ever before, but still within the margin.
My friend that only runs 16lbs often fill gas in smaller gasstations that sometimesmay have some "not so good" fuel in the Premium pump.

not questionning Mcx intergity.....IMO i would never run 17 psi with three small cylinder and 91 octane...with more than 8.5:1 compression.there is many level of detonation as you probably know, so to detect even the smallest detonation that will have a longterm effect on the engine internals(bearing,rods,pistons ect.), car manufacturer or tuning shop(not too many in the world) must have a plasma device(camera sensors)(can't tell you the name in english since i'm french) but this equipment is extremely expensive and mcx and almost all the tuner only take a pair of headphone connected with a doctor stetoscope and will listen to the engine for detonation(wich is precise but no extremely precise)
on a clutch connected dyno...not even an engine dyno....so, longterm guys will never buy such a risk at 17 psi with 91 octane.....not me for sure. but this is just my .02cent......

 

[robertyoke]

there is a big diffrence from 17 psi @ sea level and 17psi @10,000 ft!

i had a controller go south while i was in buena vista co the sled was pushing 19psi @11,000 ft (even saw 20psi a couple times that might have been closer to 13,000 ft) but it didnt go boom. i didnt want to ruin my trip so i added some race fuel for the rest on the trip.
now it stays at 15 psi at 10,000 which is where i ride most of the time. i would think at 11,000 the mcx box will push it to 16 psi.
i have never ran anything other than pump gas other than that one time.

it was a runnin' som bich at that boost!

 

[snowy1]

If they are running 17 lbs on 91 octane, there,s more to the story than we have heard, they have to be making some timing and or compression changes.

 

[SNOW JW]

Well if you think about it as far as hp they are turning 17psi to make 270 hp were as Dave is getting 270ish with 12-13lbs with a Rapid Bike on the Powderlite kit.

Still would be interesting to see how they will do at say 6500ft in some areas around here.

 

[Washy]

This is my understanding of the upgrade kit from MCX for the Nytro. The first kit that MCX came out with came with an external fuel pump and external rising rate regulator,(you took the stock regulator out of the stock unit and installed the guts into an MCX supplied external housing that turns it into rising rate. They were mapped to 18.5 psi.

The later kits did not come with the external fuel regulator or pump. The kit was only good for 14-15 psi at elevation due to the stock fuel system not being able to supply enough fuel.

The update comes with a regulator and pump and needs to be mapped to 18.5 psi like the ones that came with the original kits. If you have an early build MCX kit with the external fuel pump you already have the 270 kit. The update is for kits that did not come with this.

This is my understanding. If you have timing control you will be able to run higher boost with lesser octane fuel. How much will remain to be seen. I am too chicken to turn mine up, even though I have timing control.

 

[TBird]

Well if you think about it as far as hp they are turning 17psi to make 270 hp were as Dave is getting 270ish with 12-13lbs with a Rapid Bike on the Powderlite kit.
.

Wow, how is that even possible?
I know i know, some dynos tell that Nytro have ~138hp, but MCX says 125-128hp on their dyno.
To get 270ish hp @ 12.5lbs the unaspirated engine should have 145hp, now THATS impressive!
But from what i read the head is ported with diffrent camshafts, then it makes sense, but you didn't mention that!

 

[prowlerk]

This is my understanding of the upgrade kit from MCX for the Nytro. The first kit that MCX came out with came with an external fuel pump and external rising rate regulator,(you took the stock regulator out of the stock unit and installed the guts into an MCX supplied external housing that turns it into rising rate. They were mapped to 18.5 psi.

The later kits did not come with the external fuel regulator or pump. The kit was only good for 14-15 psi at elevation due to the stock fuel system not being able to supply enough fuel.

The update comes with a regulator and pump and needs to be mapped to 18.5 psi like the ones that came with the original kits. If you have an early build MCX kit with the external fuel pump you already have the 270 kit. The update is for kits that did not come with this.

This is my understanding. If you have timing control you will be able to run higher boost with lesser octane fuel. How much will remain to be seen. I am too chicken to turn mine up, even though I have timing control.

This is what I heard as well.

 

[snowy1]

that makes more sense as I said you will have to change compression or timing, I ran an external fuel pump and regulator on mine last year and ran up to 22 lbs, I just controllered a/f readings with fuel pressure it worked good, but I had to run good fuel, not 91 octane. you can add the fuel pump and regulator yourself for $200.

 

[Turblue]

This is what i have been running for the last 3 years........2006 mcx apex...LC pistons 2 head gaskets...mapped to 17.6psi....running 91 octane...... ran it like that the first year no problems.....mcx said this was fine at elevation....now I run half and half(av) just for insurance on bad pump fuel...

 

[Washy]

Now the question is how much boost can you run on pump gas if you have timing control. It is safe to run 12 psi at 2000 feet, how much timing would have to be pulled to run say 15psi at 2000 feet on pump gas, if even possible, and I am not saying it is, just wondering how much can be accomplished with timing control. I think PC3 can only adjust up to 10 degrees of timing.

 

[letsgetrad]

if u retard the timming per pound of boost, and have it exact it can work. my phazer is like that.

 

[supraturbo]

This is what i have been running for the last 3 years........2006 mcx apex...LC pistons 2 head gaskets...mapped to 17.6psi....running 91 octane...... ran it like that the first year no problems.....mcx said this was fine at elevation....now I run half and half(av) just for insurance on bad pump fuel...

this setup make sens, low comp.pistons and 2 head gasket and 17 psi and 91 octane......your compression rate must be around 8.0:1 wich make sens......but forget just a head shim and 17 psi.......forget it long term(5000miles) but can work for maybe500 miles????depend on the level of detonation you get....

 

[WFO or go home]

The upgrade will require a new regulator and a reflash whether you had the external pump or not.

I have been told they can run up the boost on pump because they have two intake coolers. One in the tunnel and the standard set up under the hood. This is from the distributor.