Lets Talk Water Meth Injection

[Hanaldo]

Has anyone found an intake air temp sensor that is methanol safe yet, do they exist?

Edited July 13, 2012 by Hanaldo

[Manuel Kasko]

I also bought 8 gallons of the snow performance premix water/meth mix so that should do me for a while.

How much did this set you back?

[Mitcho_7]

How much did this set you back?

You can get them from rocket or a seller has them on eBay. I think you are better of buying a 20l drum of methanol for $70 and buying distilled water form the supermarket which is $2 for 2 litres. Works out cheaper than paying for postage of the boost juice

[Manuel Kasko]

Where abouts is this methanol for 20L do we have a supplier down here in ACT

[DaveO74]

Only one bend so all good, most people seem to start boost at 5 psi and have it all in at whatever max boost pressure they plan to run.

I am probably just gonna let Jez pick the sweet spot and see what things are doing low in the load points

For 8 x 1 gallon containers it was 110 bux. I know it's more expensive than mixing it yourself but methanol is VERY carcinogenic plus it's not as easy as going 1 litre of water and 1 litre of meth, you have to go by weight apparently. So I have read but this could be incorrect.

I'm lucky that my car isn't a daily and sees more track time than street driving lately so I'm not overly concerned about the price

[Mitcho_7]

Where abouts is this methanol for 20L do we have a supplier down here in ACT

Yeh man we have several, couple in fyshwick and queanbeyan

Didnt know about the by weight measuring, it shouldnt be to hard to work ou with basic chemistry anyway. As long as you mix in the same proportions everytime/ the same as you tuned with and as long as you mix it in a well vented area it should be fine really

Edited July 13, 2012 by Mitcho_7

[Hanaldo]

Shouldn't matter whether you go by weight or volume. 50/50 volume split would be about 45/55 split by weight, so it's not a huge difference. What matters is that you use the same method every time, don't go by weight for one mixture and get it tuned, then decide to go by volume.

[Mitcho_7]

Shouldn't matter whether you go by weight or volume. 50/50 volume split would be about 45/55 split by weight, so it's not a huge difference. What matters is that you use the same method every time, don't go by weight for one mixture and get it tuned, then decide to go by volume.

Exactly my thoughts, stick to the same mix all the way through and itll be fine

[DaveO74]

Yeah true, didn't think of it that way. I'm just a bit lazy I spose and rocket industries is only a 15-20min drive from work so no biggy for me.

If I find that I end up going through heaps of the stuff I'll look at mixing it myself.

I meant to post this earlier, a good read on how to tune for WMI

http://www.romraider.com/forum/viewtopic.php?f=33&t=8051

[Mitcho_7]

So going off that, they have to tune without the wmi running and get the target afr where the tuner is comfortable with. Then turn on the wmi, see how much the afr drops and lean it out/ add more timing (within safety limits of course) to get it back to the target afr.

Sounds logical to me. Might be worth getting them to save a copy of the non wmi tune and give it to you so you have a copy of a safe tune that you can run without having to worry about not boosting etc if something plays up on the kit. That is presuming the ecu doesnt have te ability to swap over maps Eg nistune and power fc

[TiTAN]

8 gallons will last you a long time.

expect to go through ~2L a month or less for the average person

[DaveO74]

So going off that, they have to tune without the wmi running and get the target afr where the tuner is comfortable with. Then turn on the wmi, see how much the afr drops and lean it out/ add more timing (within safety limits of course) to get it back to the target afr.

Sounds logical to me. Might be worth getting them to save a copy of the non wmi tune and give it to you so you have a copy of a safe tune that you can run without having to worry about not boosting etc if something plays up on the kit. That is presuming the ecu doesnt have te ability to swap over maps Eg nistune and power fc

I have a pfc and fc data logit I'll get Jez to give me some maps.

So I suppose to start with I'll set it for something silly like start boost at 40psi and finish at 50 psi so it just won't come on and get Jez to start from there.

I have no idea when it comes to tuning so maybe someone who knows could chime in and let me know if that link makes things sound like a very time consuming exercise or not.

I assume it would be the same as getting a full tune with a new ecu.

@Titan, thanks for the info mate. When I spoke with coolingmist they suggested the large tank because I do track the car and even they said I will definately go through a lot of meth in these situations.

[JustinP]

Has anyone found an intake air temp sensor that is methanol safe yet, do they exist?

I'm not sure it would make much difference even if you could put the IAT sensor after the WMI injector. The real temperature drop would occur when the WMI mixture changes state in the cylinder.

Would be a bitch trying to measure that!

[TiTAN]

on the track is a different story, expect the car to drink it in that scenario.

as its only on when you are on boost and around town thats never an issue as you cant be on boost for long periods, on a race track however most of the time you are out there you are trying to keep it on boost.

for a car thats street only, a small tank is great. the more track use it gets the bigger your tank should be or you will be filling it after every session.

[JustinP]

Could everyone using WMI please post what size nozzle/s or injector/s they use (in ml/min)?

Would be great to see what size is most effective for each setup.

[Hanaldo]

I'm not sure it would make much difference even if you could put the IAT sensor after the WMI injector. The real temperature drop would occur when the WMI mixture changes state in the cylinder.

Would be a bitch trying to measure that!

Yeh not so concerned about trying to measure the temperature drop, but my IAT sensor is just before the throttle body. There's no way I could place a WMI injector so that the IAT sensor is out of the stream.

[JustinP]

Yeh not so concerned about trying to measure the temperature drop, but my IAT sensor is just before the throttle body. There's no way I could place a WMI injector so that the IAT sensor is out of the stream.

Ahh OK. So you are considering going down the WMI route too?

[WARLORD]

630 ml/min

with variable water meth controller

Edited July 13, 2012 by WARLORD

[JustinP]

630 ml/min

with variable water meth controller

I think I will use the 625ml/min one that came with my kit. It's a is a bit more than what is recommended for the engine size, but considering the application I think it will be better than the next size down (375ml/min).

Good to hear someone else is going for a bigger nozzle, it has put my mind at ease a bit.

[The Mafia]

Running 315rwkw, I saw no difference between 375ml and 675ml nozzles, only a bottle that emptied twice as fast.

With the 375ml nozzle, I was able to max out my timing, and that was with a GT3076 and a 0.63 rear housing. If you have a 0.82 rear housing I'm sure that you won't see any gains with the bigger nozzle.