Any downside to water injection?

[Bmaughan]

I’m thinking about pure water injection. Running e85 year round so I don’t really need the octane from meth and I just got my tune dialed in so I’d prefer to just keep it water.
Any downsides? No tune changes needed correct?

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[Gregory347]

Probably not needed with E85.

 

[Bmaughan]

Probably not needed with E85.

Yeah I feel like that’s true but Im just looking for as much safety as I can build into this car. I’m in Az so inlet temps get crazy...

 

[Mustang_Lou]

I wouldn't personally risk it unless you can be 100% sure there's:
1. a failsafe to prevent the pump from malfunctioning and hydro-locking your car with too much mist/water, and
2. the timing can be pulled if the pump similarly malfunctions &/or the nozzle clogs and you're not getting the mist your tune thinks it is.

Back when I used one 10 years ago, the quality wasn't OE at all.

I'd say you've got more risk of engine damage with it than without but that's my opinion.

 

[SolarFlare]

Even a 50/50 mix won’t throw off the tune. Mine trimmed about 5-7% pulled when meth was sprayed

 

[WildHorse]

"Most modern consumer vehicle engines are pre-programmed with specific fuel-to-air ratios, so introducing water without re-programming the car's computer or otherwise changing these ratios will most likely provide no benefit, and may likely reduce performance or damage the engine. In addition, most modern fuel systems cannot determine that water in any form has been added, and cannot determine a new compression ratio or otherwise take advantage of lower cylinder temperatures. In most cases in pre-programmed cars, introducing water vapor via an indirect water injection method causes loss of power because the water vapor takes the place of air (and fuel in engines with either a carburetor or single point injection) that is required to complete the combustion process and produce power. Normally, only vehicles re-tuned for water injection see any benefits."

 

[SolarFlare]

Lol

 

[Bmaughan]

"Most modern consumer vehicle engines are pre-programmed with specific fuel-to-air ratios, so introducing water without re-programming the car's computer or otherwise changing these ratios will most likely provide no benefit, and may likely reduce performance or damage the engine. In addition, most modern fuel systems cannot determine that water in any form has been added, and cannot determine a new compression ratio or otherwise take advantage of lower cylinder temperatures. In most cases in pre-programmed cars, introducing water vapor via an indirect water injection method causes loss of power because the water vapor takes the place of air (and fuel in engines with either a carburetor or single point injection) that is required to complete the combustion process and produce power. Normally, only vehicles re-tuned for water injection see any benefits."

Where is this quote from?

 

[Bmaughan]

Lol

This sounds snarky but I mean it as a legit question.. why the lol?

 

[SolarFlare]

I listen to my tuner and people with my same vehicle that use it, no one else.

I’d do 50/50, best of both, a little octane boost and a little cooling.

My tuner told me he doesn’t tune for it meaning he won’t add timing or boost because if system fails more than likely so will your motor. I live in a hot environment and in Mexico sometimes do multiple runs. There’s only so much the intercooler can do in hot environments so I’m throwing a small amount of meth and water to keep the IATs in check and add a little extra octane

 

[Bmaughan]

I listen to my tuner and people with my same vehicle that use it, no one else.

I’d do 50/50, best of both, a little octane boost and a little cooling.

My tuner told me he doesn’t tune for it meaning he won’t add timing or boost because if system fails more than likely so will your motor. I live in a hot environment and in Mexico sometimes do multiple runs. There’s only so much the intercooler can do in hot environments so I’m throwing a small amount of meth and water to keep the IATs in check and add a little extra octane

So just to make sure I understand... no tune is necessary to inject 50/50?
I always thought that would cause it to go rich but you’re saying that the fuel trims can handle that discrepancy?

Do you mind giving a bit of info on your setup..How much boost and how much water/meth flow? How is that determined?

Sorry to bombard you with so many questions... I appreciate the help!

 

[SolarFlare]

Depends on how much you spray. I don’t use it as a fuel or timing adder so not much is needed. It’s a snow performance Kit with a #4 225ML nozzle triggered by a Hobbs switch. IAT went from 100F at the starting line to 110F at the end of the quarter mile. Use to get to about 150 before meth.

 

[Bmaughan]

Depends on how much you spray. I don’t use it as a fuel or timing adder so not much is needed. It’s a snow performance Kit with a #4 225ML nozzle triggered by a Hobbs switch. IAT went from 100F at the starting line to 110F at the end of the quarter mile. Use to get to about 150 before meth.

That’s great! Yeah I wouldn’t want it as anything other than a charge cooler. At what mani pressure do you have it set to come on then?

 

[Bmaughan]

You must have a iat sensor somewhere upstream then? My maf is in the intercooler and I would assume you have to spray post maf...
Do you have yours mounted in the intake?

 

[SolarFlare]

4psi. Pics in the last 1 or 2 pages of my build thread. Sprays between intercooler and Tb.

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