Nitro MCX 240 injectors/fuel pump

[Sleds R Fun]

At aproxitmatly what boost does the pump limit out? Is it possible to run 18#

On the stage 2 / 270 kit can you run pump gas @ 4000ft 18#'s.


The reason I ask is: I was riding yesterday and a 2010 nitro Stage 1 showed up running pump gas and 18#'s. He pulled the side panel off just head shim and no external pump. Did't think that was possible?

 

[BBNytro]

Well it is possible for a little while. Look for it in the parts section when the rods come through the block. Stock pump is only good for 14 lbs.

 

[Tuesday]

270 kit has an external pump, it can handle 18lbs no problem. Stock pump is only for the 240 kit.

 

[Sleds R Fun]

SO can 18#s be done on stage 2 pump gas!!

 

[robb]

Tuesday do you have a 270 MCX and what fuel yuo run. Thanks

 

[TBird]

I would not run 18lbs @ 4000feet.
That boost @ 4000 is the same as 16.1lbs @ sealevel = to much for oem pump.

 

[Tuesday]

As mentioned it depends on what altitude you are at and how much boost to run.

3000ft -15-16lbs

5000+ft 17-18lbs the TVC automatically adjusts boost pressure.

I use the mcx display and like to monitor KPA, I set it for approx 203 KPA down low and aim for approx 210 KPA at altitude. Its hard to get enough load at lower elevations to set the KPA to 210 as it may generate an over boost at higher alt.

I am told you can run pump prem. and get away with it but typically I run straight AV 100LL fuel just to be safe.

 

[TBird]

As mentioned it depends on what altitude you are at and how much boost to run.

3000ft -15-16lbs

5000+ft 17-18lbs the TVC automatically adjusts boost pressure.

I use the mcx display and like to monitor KPA, I set it for approx 203 KPA down low and aim for approx 210 KPA at altitude. Its hard to get enough load at lower elevations to set the KPA to 210 as it may generate an over boost at higher alt.

I am told you can run pump prem. and get away with it but typically I run straight AV 100LL fuel just to be safe.

It's not fuel octane that is my main concern, it's the oem fuelpump, i've seen / heard of many oem fuelpump's having trouble to feed 240hp, 16.1lbs @ sealevel is waaaay over 240hp.
As i said earlier, if i had an 240 i would consider to buy 270 fuelkit with external fuelpump, just for the piece of mind.
But combination not enough fuel and to high boost for the fuel octane = kaboom

 

[Tarzannr1]

It's not fuel octane that is my main concern, it's the oem fuelpump, i've seen / heard of many oem fuelpump's having trouble to feed 240hp, 16.1lbs @ sealevel is waaaay over 240hp.
As i said earlier, if i had an 240 i would consider to buy 270 fuelkit with external fuelpump, just for the piece of mind.
But combination not enough fuel and to high boost for the fuel octane = kaboom

KABOOM!!!

 

[SLY]

SO can 18#s be done on stage 2 pump gas!!

I wouldn't chance it. On and off the throttle might be ok but a long, hard pull and it will go lean due to lack of fuel........tick, tock

 

[Tuesday]

It's not fuel octane that is my main concern, it's the oem fuelpump, i've seen / heard of many oem fuelpump's having trouble to feed 240hp, 16.1lbs @ sealevel is waaaay over 240hp.
As i said earlier, if i had an 240 i would consider to buy 270 fuelkit with external fuelpump, just for the piece of mind.
But combination not enough fuel and to high boost for the fuel octane = kaboom

Definitely to run stage 2 you need the fuel pump, regulator and mapping. Mine was one of the early kits and came with all the hardware and mapping.

Dont push the stock pump past 240 or you can run into trouble.

 

[SLY]

I wouldn't chance it. On and off the throttle might be ok but a long, hard pull and it will go lean due to lack of fuel........tick, tock

Sorry, misread the question, thought you were asking about a 240 kit. I wouldn't run a stage 2 past 17 on pump myself but you might get lucky.....or maybe not, and do you want to be the one to find out when avgas is cheap insurance.