Boost question fx nytro

[rlcofmn]

The PC5 with a wideband is a piggyback controller, too. They all just extend the duration that the stock injectors are open and supplying fuel.
100% injector is 100% injector, doesn't matter on the controller, one is not going to "supply" more fuel then the other...

You are correct, but it will supply enough fuel to run 10lbs at 2k feet.

 

[mbarryracing]

The limiting factor for any boost level will be the fuel pump and injector volume, not so much controller capability.

 

[rlcofmn]

Hows mine running then? I've been testing this system all season, I know I'm close to the limit but I'm not there yet.

 

[mbarryracing]

??? Not sure what your point is???????????????????
Are you trying to argue that your fuel controller is what actually dictates how much boost you can run instead of the fuel system?
Sorry if you misunderstood me, I was speaking in general terms and not on any specific controllers, but if the system you have been testing all season is using some super controller which allows you to run any boost level with the stock fuel system, then you're probably on to something.
My experience (success and failures) has shown that a controller can take the injectors to 100% duty cycle but if the fuel supply isn't there... you just end up having injectors WFO with lean AFRs

 

[rlcofmn]

??? Not sure what your point is???????????????????
Are you trying to argue that your fuel controller is what actually dictates how much boost you can run instead of the fuel system

You answered my question with a question. He can't get enough fuel to run 10 lbs at 3500. I run 10lbs at 2k for the past 500 miles or so without any signs of running out of fuel at 12.8 AFR. How does mine run? Both stock fuel systems just different piggyback controllers.

Sorry if you misunderstood me, I was speaking in general terms and not on any specific controllers, but if the system you have been testing all season is using some super controller which allows you to run any boost level with the stock fuel system, then you're probably on to something.
My experience (success and failures) has shown that a controller can take the injectors to 100% duty cycle but if the fuel supply isn't there... you just end up having injectors WFO with lean AFRs

There is no argument that the first thing that should run out is the pump, then the injectors. But it does seem that some fuel controllers are running out before the mechanical items are. If anything I am arguing is the point that you should be able to run stock fuel system to. In my testing I have found 9 at sea level to be fine. This means at 3500 10 lbs running that lean is a controller problem not a fuel system problem.

I am in no way ignorent of what you are saying, I do have a new fuel system sitting on the shelf. But I want to get the testing completed on a stock system first and my compression is a limiting factor more so than fuel right now.

 

[mbarryracing]

Ah, OK now I see why you are saying what you are saying...
I obviously can't speak for your sled, and I certainly don't know what controller you have nor what fuel you are running nor what AFR you are getting, but I still don't think there are too many that will agree with you that as a rule of thumb you can "safely" run 9 psi boost at sea level with the stock Nytro fuel system and maintain 11.5:1 AFR, not on pump gas.
Certainly not one turbo kit company would...
And yes, there are other variables to take into consideration as well.

10 lbs at 3500 feet on pump gas sounds scary to me.

Confused by the contradiction here, if you are running 9 lbs at sea level with the stock fuel system, then why does 10 lbs at 3500 feet sound scary? As you go up in elevation, the more boost you can run.
Are you running race fuel?

 

[rlcofmn]

Ah, OK now I see why you are saying what you are saying...
I obviously can't speak for your sled, and I certainly don't know what controller you have nor what fuel you are running nor what AFR you are getting, but I still don't think there are too many that will agree with you that as a rule of thumb you can "safely" run 9 psi boost at sea level with the stock Nytro fuel system and maintain 11.5:1 AFR, not on pump gas.
Certainly not one turbo kit company would...
And yes, there are other variables to take into consideration as well.

10 lbs at 3500 feet on pump gas sounds scary to me.

Confused by the contradiction here, if you are running 9 lbs at sea level with the stock fuel system, then why does 10 lbs at 3500 feet sound scary? As you go up in elevation, the more boost you can run.
Are you running race fuel?

I'm running a Torco blend to 100, thats why I say that sounds scary. I have to think you would agree, 10 lbs at 3500 on pump sounds scary. Not to mention now we find out how lean it is, making it even more scary yet.

I was not in my conversation with you in any way talking about detonation prevention nor safe levels on pump gas. Just that the fuel system will support more than 7 lbs at sea level with just a piggyback controller.

Just to clear it up, I run 9 lbs at sea level +1 psi per 2500 feet, 1 quart Torco accelerator per 10 gallons of 90, 12.5 to 12.8 AFR at WOT and using a PCV. Does this mean it's safe? No, the only thing I know is that I can run 12.5 AFR at 9 lbs at sea level using a stock fuel pump and injectors.

I don't think we are too far off the same page, more just not understanding eachother.

 

[mbarryracing]

Cool

as well, keeping intake air temps down helps too.

 

[rlcofmn]

Cool

as well, keeping intake air temps down helps too.

Engine temps are also worth considering. Both things I don't have going for me

 

[mbarryracing]

Cool

as well, keeping intake air temps down helps too.

Engine temps are also worth considering. Both things I don't have going for me

Been there, added the additional cooler at the back of my Attak and that helped some as long as I stay at a steady pace on the trail, trying to stay under 175 F.
Try the extra mountain Nytro cooler in the tunnel? Right side front.

 

[Nytro19]

Hey guys thanks for the input. You both make sense to me. I'm going to fatten up the controller to get the most use out of the stock injectors and pump. Once I start seeing richer accel and full boost numbers on the A/F meter I'll tweak the boost with an eye on exhaust gas temps and keep it rich. Thanks again!