How safe is it to run nitrous on a stock 2 gen coyote?

[arellanosbb]

I have a 2017 mustang gt everything is stock but I want to know if I need to do anything to the engine before running nitrous?

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[hlfbkd420]

Do a little dance

 

[K4fxd]

I'm pretty sure a 100 HP wet shot is safe. Dry I'd want LU47 injectors 150 HP I'd want to widen the ring gap.

 

[engineermike]

The problem with a wet shot is that neither the nitrous system nor the pcm have complete control over fueling. There are at least 20 different reasons the pcm could decide to cut fuel. This is safe because no fuel means no problem. But if the wet shot continues supplying fuel then you wind up with an extreme lean condition.

Traction control, over-rev, speed limiter, shift torque reduction, etc are just a few examples of reasons it might cut fuel.

 

[MKL_DS]

I'd certainly recommend a tune set up for Nitrous use.

 

[WildHorse]

The problem with a wet shot is that neither the nitrous system nor the pcm have complete control over fueling. There are at least 20 different reasons the pcm could decide to cut fuel. This is safe because no fuel means no problem. But if the wet shot continues supplying fuel then you wind up with an extreme lean condition.

Traction control, over-rev, speed limiter, shift torque reduction, etc are just a few examples of reasons it might cut fuel.

That's what nitrous controllers are for. I wouldn't worry about a 100 wet shot & no tune. 200+wet shot w/ tune I'd better hope all the stars are lining up & the octane Gods are smiling upon me.

 

[kevinvan6000]

Check out the Nitrous Coyotes facebook group. General consensus there is 100 Wet shot is fine on stock motor/fuel system. At 150+, its recommended to look at a secondary fuel system to supply the nitrous kit. Theory being it starts to pull too much fuel from the rails to supply the fuel solenoid possibly leading to a lean condition.

Edit - with proper tuning.

 

[engineermike]

That's what nitrous controllers are for.

Maybe I’m not following but let’s say you’re at 5000 rpm and everything is fat and happy. Then the pcm decides to cut off fuel to 3 cylinders for any of 20 possible reasons to do so. Now you’re still getting fuel from the wet shot into those 3 cylinders but about 1/5 of the fuel you need. How does a nitrous controller help you in that situation?

 

[engineermike]

Edit - with proper tuning.

That’s the thing about the torque reduction strategy…if it can’t get the desired torque reduction with timing retard, it will start cutting fuel to cylinders. There’s no practical option to turn off fuel cut and as long as it’s a possibility then bad things can happen.

 

[WildHorse]

Maybe I’m not following but let’s say you’re at 5000 rpm and everything is fat and happy. Then the pcm decides to cut off fuel to 3 cylinders for any of 20 possible reasons to do so. Now you’re still getting fuel from the wet shot into those 3 cylinders but about 1/5 of the fuel you need. How does a nitrous controller help you in that situation?

When the throttle is cut, it'll turn off. Low fuel pressure same deal. You are talking stock tune.. so unless your racinging on the street with radial TA's and all the nannies on.. You shouldn't have a problem. Also how will it cut fuel to just 3 cylinders on a coyote ? AFAIK they're either all on, or all off.

 

[engineermike]

That’s the problem…fuel pressure and throttle are fine but the pcm decides to cut the fuel injector then the nitrous kit doesn’t know it.

For instance, the pcm might cut torque during a wot upshift. First option is to retard timing. If it can’t get the desired torque reduction with timing retard, it will move on to enleanment. However, most fords in the last 5 years have enleanment torque reduction disabled. So the next step is cutting fuel injectors. It will absolutely cut torque using individual cylinder fuel cut, in 12.5% increments obviously. I have logs showing this exact behavior. Of course you can try to avoid it by commanding full torque during the shifts in the tune, but there are 19 other reasons for it to cut torque.

 

[Andy13186]

The proper question is "how retarded is it to run nitrous?"

 

[Jordan @ Lethal]

Can nitrous be safely run on a stock gen 2? Yes. It will require quite several supporting add ons if you want to run it with confidence, which can start adding up. That being said, you mentioned your car being stock; I assume this is just a street car/weekend warrior? There are less complex and more desirable options I'd consider first if that's the case. What's the overall goal in mind?

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