GTM Stage 2 S/C on Meth 507whp/357wtq

Nixlimited · 12-13-2011, 07:17 PM

Quote:

Originally Posted by Mike@GTM

Injecting just water will only improve knock resistance. The methanol will lower intake air temperatures more than just water alone in addition to having a higher knock resistance than gasoline. Jordo and I had a good discussion in a different thread that went into more detail.

If you are doing water/methanol or just straight water, you MUST use DISTILLED water! Any dissolved solids will clog the injectors over time! Think about how often you have to clean/replace the aerator screen in your faucets at home...especially in SoCal where we have nasty, hard water that is barely potable. You do not want that dissolved lime and crap in your motor do you?

Just to be clear, my understanding is that injecting water should improve knock resistance and lower IAT as well as allow you to (in theory at least) run a leaner AFR since you can replace fuel with water for cylinder cooling. Water has a significantly higher specific heat capacity than any sort of fuel which makes it phenomenal for cooling (as compared to say gas). I definitely understand that you need to run distilled water only, but like I said, that's available anywhere and it's cheap. Meth mixes aren't.

Another consideration is the fact that meth is a fuel so *I believe* you have to tune the fueling more than with just water. With multiple maps this may not really be an issue, but I strongly prefer simplicity.

I do realize that you don't have the added power potential when you run just water and no meth, but my goal with a water injection system would be safety margin, not additional WHP. But that's just me.

In any event, congrats on the awesome build!

Mike@GTM · 12-13-2011, 08:04 PM

Quote:

Originally Posted by kosstick

You currently have a HFS-3 aqua mist on your website. is it the same?

Yes, and no. The kit on our website is the basic kit. The one we'll be adding has the additional tees, nozzles, etc.

Quote:

Originally Posted by Nixlimited

Just to be clear, my understanding is that injecting water should improve knock resistance and lower IAT as well as allow you to (in theory at least) run a leaner AFR since you can replace fuel with water for cylinder cooling. Water has a significantly higher specific heat capacity than any sort of fuel which makes it phenomenal for cooling (as compared to say gas). I definitely understand that you need to run distilled water only, but like I said, that's available anywhere and it's cheap. Meth mixes aren't.

Another consideration is the fact that meth is a fuel so *I believe* you have to tune the fueling more than with just water. With multiple maps this may not really be an issue, but I strongly prefer simplicity.

I do realize that you don't have the added power potential when you run just water and no meth, but my goal with a water injection system would be safety margin, not additional WHP. But that's just me.

In any event, congrats on the awesome build!

Yes, injecting water does lower IAT, but meth does it better. True, water has a high heat capacity, but methanol evaporates faster and it's the change of state from a liquid to a gas that absorbs lots of heat (methanol boils at a lower temperature than water).

You don't necessarily *have* to tune for it, but it is beneficial to do so. Anyway, water injection is perfectly fine for what you want.

So, when are you going to be doing this build?

Nixlimited · 12-14-2011, 09:26 AM

Quote:

Originally Posted by Mike@GTM

Yes, injecting water does lower IAT, but meth does it better. True, water has a high heat capacity, but methanol evaporates faster and it's the change of state from a liquid to a gas that absorbs lots of heat (methanol boils at a lower temperature than water).

You don't necessarily *have* to tune for it, but it is beneficial to do so. Anyway, water injection is perfectly fine for what you want.

So, when are you going to be doing this build?

No arguments with that! Well, I am picking my car up on the 27th. So, after a full break-in and a little financial recovery from the down payment, I will be up there to see you guys. I decided to do the brakes on my car before I even picked it up so there went some of my mod money, haha.

GUTCH · 12-14-2011, 09:54 AM

Is water or water/meth injection recommended if one is using 98 RON fuel or is this just an optional extra?

Mike@GTM · 12-14-2011, 11:43 AM

Quote:

Originally Posted by Nixlimited

No arguments with that! Well, I am picking my car up on the 27th. So, after a full break-in and a little financial recovery from the down payment, I will be up there to see you guys. I decided to do the brakes on my car before I even picked it up so there went some of my mod money, haha.

Sweet! I'm excited for you...nothing like that new car smell.

Quote:

Originally Posted by GUTCH

Is water or water/meth injection recommended if one is using 98 RON fuel or is this just an optional extra?

It is an optional extra...it is not required. We only recommend it if you are going for gobs of power on stock compression with pump gas. The stage 2 supercharger kit out of the box performs very well and does not need water/meth injection to operate correctly.

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12-14-2011, 09:54 AM	#4 (permalink)
GUTCH Base Member Join Date: Jun 2010 Location: Australia Posts: 138 Drives: 2011 Nissan 370Z Rep Power: 16	Is water or water/meth injection recommended if one is using 98 RON fuel or is this just an optional extra?