would you add water to my set-up? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Methanol/Water Injection Place to talk about meth/water injection.

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Old 07-16-2009, 04:04 PM   #21
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can someone in the know confirm that spraying water (not meth) will lower EGT significantly? The more I read about lowering egt, the more I see that people discuss water and meth synonymously.
step one: get an EGT

step two: see if you have an EGT problem

step three: post here again with results.
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Old 07-16-2009, 04:08 PM   #22
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As I understand it, the meth is really good at lowering the intake charge temp, the water is really good at reducing ping, the combo lowers EGT's.

+1 on the EGT gage.
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Old 07-16-2009, 04:13 PM   #23
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EGT gauge is in the works, but I'm fairly certain I have an EGT problem since the manifold is warped.

I just want to drive this car and its starting to depress me.
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Old 07-16-2009, 04:31 PM   #24
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Maybe if you reduce EGT's you'll end the loosening nuts problem? Is that where you're headed w/ this idea?
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Old 07-18-2009, 02:18 PM   #25
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Maybe if you reduce EGT's you'll end the loosening nuts problem? Is that where you're headed w/ this idea?
no, I want to make sure the motor stays together for a long time.
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Old 07-19-2009, 05:58 AM   #26
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water reduces EGTs because it reduces burn temperatures. Water only in an injection system will not affect your AF ratio, it will only affect your EGTs. Water doesn't burn it only becomes a gas, when it becomes a gas it expands alot, and the change from liquid(mist) to gas takes alot of energy, so you get expansion without more fuel. Meth for the pipes, water for the engine. At 25% meth my pipes aren't cool, but at 50% they are cool to the touch.
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Old 07-19-2009, 11:38 PM   #27
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Meth for the pipes, water for the engine. At 25% meth my pipes aren't cool, but at 50% they are cool to the touch.
While I'm not debating that injecting meth upstream of the TB will have a cooling effect on the pipes (and thus a nontrivial anti-detonant effect on the engine) the most significant benefit to WI in a FI application is due not to evaporative cooling, but rather due to the direct knock-suppressing qualities of water within the chamber during the combustion event. Methanol is not a significant contributor to this quality.

And yes, water alone will measurably decrease EGT for a given power level, more so assuming that it permits an advance in ignition timing.
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Old 07-19-2009, 11:43 PM   #28
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While I'm not debating that injecting meth upstream of the TB will have a cooling effect on the pipes (and thus a nontrivial anti-detonant effect on the engine) the most significant benefit to WI in a FI application is due not to evaporative cooling, but rather due to the direct knock-suppressing qualities of water within the chamber during the combustion event.
I would agree with you, which is why I am at 25%. more meth means more tuning.
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