Thinking of water injection..any recommendations?

[classicauto]

I believe the smaller, or standard, pump is 130-150psi which is what I'm using at the moment.

They offer a 220 or 240psi pump for multi nozzle setups. That will be the only upgrade I'd do. IMO the higher the pressure the better in these systems with a mechanical pump. Plus taking into account the different losses AND manifold pressure you really don't end up with much pressure at the head of the nozzle.

[FC3S Murray]

I emailed Snow and they said the newest stage 1 kit comes with a 220 psi output pump.

Either Devils own or Snow...need to decide. hmmm.

Devils own stage 1 has a 250psi pump but no tank for 240.00. Additional 35.00 for a 4qt tank.
Snow has the stage one for 304.00 with a 4 quart tank.

How long does a 4 qt tank last in relation to spirited driving?

[TitaniumTT]

So you're saying that right now, with my setup and current map, & I'm making 405rwhp on stock twins, that if I added WI I would GAIN power? Exactely how does injecting water, which is know to put out flames, gain power? Is it just through a cooler charge? If that is the case, than I doubt myself, or anyone with a very effiecent intercooler would see any real performance gains as my AIT's are near ambient anyway.

Correct me if I'm wrong but is the performance gain only though cooler AIT's? I can see strait meth and bumping the timing gaining a ton of power, but the way you're touting water injection, doesn't seem logical.

[FC3S Murray]

Originally Posted by TitaniumTT

So you're saying that right now, with my setup and current map, & I'm making 405rwhp on stock twins, that if I added WI I would GAIN power? Exactely how does injecting water, which is know to put out flames, gain power? Is it just through a cooler charge? If that is the case, than I doubt myself, or anyone with a very effiecent intercooler would see any real performance gains as my AIT's are near ambient anyway.

Correct me if I'm wrong but is the performance gain only though cooler AIT's? I can see strait meth and bumping the timing gaining a ton of power, but the way you're touting water injection, doesn't seem logical.

Brian I think with a 30meth/70water mix(50/50 commonly called) you would see a performance gain and a better safety margin without re-tuning your map. Of course you could fine adjust your tune to accomadate the meth and get even more power BUT system failure could lead to motor failure.

I do think that if the owner is running an efficient IC and has very well routed heat scavanging system/under hood temp control, then WI might not seem like a very big factor in gaining HP. I do think however if the owner was to road race /circuit, that the WI with water only would just be a smart choice because you know that your AIT's are gonna rise..maybe not to extreme temps if your ducting is functional but those AIT's will be hotter then a motor with WI would record.

[RICE RACING]

I don't want to come across the wrong way with this so I will try to explain as neutrally as I can.

If you run a blend of meth to water at 50/50 on top of your normal tune given the right ratio (all cars have a sweet spot) for turn on point and amount to inject. When you inject pre turbo you will realize a net performance gain, This is brought about by a charge increase into the engine (more air and more fuel over and above anything that the water may displace). People not associated with me in any way have tested this and listed very significant acceleration gains in real world tests. A rough rule of thumb is you want around 100cc per 150bhp from my experience (though note each car set up is different in what it will respond too for best power, but rest assured it will increase the power and not decrease it if you follow the above recommendations)

The same qty and trigger points after the turbo yield no gains at all, but detonation is eliminated with either system.

Injection of a 100% water mixture on top of your existing safe tune up will cost you power but increase reliability and durability just to be clear.

[knonfs]

Originally Posted by RICE RACING

I don't want to come across the wrong way with this so I will try to explain as neutrally as I can.

If you run a blend of meth to water at 50/50 on top of your normal tune given the right ratio (all cars have a sweet spot) for turn on point and amount to inject. When you inject pre turbo you will realize a net performance gain, This is brought about by a charge increase into the engine (more air and more fuel over and above anything that the water may displace). People not associated with me in any way have tested this and listed very significant acceleration gains in real world tests. A rough rule of thumb is you want around 100cc per 150bhp from my experience (though note each car set up is different in what it will respond too for best power, but rest assured it will increase the power and not decrease it if you follow the above recommendations)

The same qty and trigger points after the turbo yield no gains at all, but detonation is eliminated with either system.

Injection of a 100% water mixture on top of your existing safe tune up will cost you power but increase reliability and durability just to be clear.

Can I run a mix blend with your kit? Or the do I have to modify anything (lines, filter, etc)?

[RICE RACING]

Originally Posted by knonfs

Can I run a mix blend with your kit? Or the do I have to modify anything (lines, filter, etc)?

I have been trialing exactly 50/50 Methanol to Water (by mass) for a while now and there is no problem so far, but I like to run tests for at least a year before I personally tell people its fine. (I do have customers who have run this way and reported no problems with any parts).

I have components in bottles of various solutions sitting for months/years at a time, I only started this one a month back... so far I can tell no ill effect on the above mixture.

[TitaniumTT]

Well, this is the whole problem with MAP based systems. If you increase the mass of air moving into the engine without retuning for it, engine go boom. The extreme example is the stock twins @ 15psi vs a GT60 @ 15psi. 15psi is not 15psi and you need to be careful especially with a MAP based system. It the WI pre-turbo is really changing the mass of air entering the engine by way of cooler charge temps, then as you state here,

Originally Posted by RICE RACING

This is brought about by a charge increase into the engine (more air and more fuel over and above anything that the water may displace).

than I wouldn't think that slapping a WI system on is going to be safe. However, if boost levels are kept constant, the mass isn't going to change dramatically, the water is displacing some of the mass, and the cooler charge temps are being properly compensated, the difference is minimal. I just feel that to say zero re-tune is needed is a little sketchy is all.

[FC3S Murray]

So pre-turbo is better for performance and detionation while post-turbo will only lower detionation EVEN with a meth 50/50 mix?

[TitaniumTT]

This is just my OCD acting up, but something about the way you're stating it isn't sitting right with me. If you tune your car and then lower the AIT's, you're now in sections of the map/comp tables that you've never been before, so you can't really say it's 100% safe unless you test and tune for it.

The reason that the pre-turbo is better for performance is becuase the charge air temp isn't climbing nearly as high with the introduction of water. I would like to see a test done on the dyno where you make a few pulls with no AI at all and monitor L, EGT's AIT's and PRE-intercooler charge temps. I have a bunch of logs that show my AIT's rise 10*F after 10-20 dyno runs over the course of 5 hours and they are within 10-15* of ambient unless some sort of heat soak issue has occured. This log in particular is close to a 400rwhp on stock twins run, look at the AIT's pre and post intercooler. As soon as the pedal is matted in 4th, the charge temps go from ~100* to 250* and follow the boost as it rises. This is pysics, there is no way around it, compressing a gas makes it hotter. Adding water pre-turbo will take some of this heat out. Cooler air (relatively) into an intercooler will give you cooler temps out.

Now I'm not knocking the knock resistance charateristics of it but to say that the addition of water without a retune is a little far fetched becuase you'll be in area's of the map that you haven't explored. Aside from the knock resistance charaterics of it, for me, it just seems like a band-aid, sorry.

BUT, and this is a big but, if you're talking about big amounts of boost, then the benefits start to shine becuase lets face it, you can't escape pysics, more boost more heat, but for street cars and 250* charge temps, and near ambient intake temps..... I don't think it's really worth it. A properly ducted and sealed intercooler with good effeicency is more reliable than a WI system. Now if we want to talk about chemical intercooling, that's something totally different and something that I would like to explore on my FD becuase I have 500rwhp plans for that car and more experimenting..... plus it's time to finish the FC.... relatively speaking anyway.

[dudemaaan]

In my experience the tune doesn't change or need any changes when adding water (mine is preturbo). My AFR's didn't change at all when adding the water, my air temps didn't really change much either. They did seem to stay more constant on long pulls, and even when I increased the boost an extra 8 psi the air temps stayed the same. I never dynoed before and after the water or anything, but to me it felt a little stronger. I don't think it's a large increase in power if you keep the same boost levels, but when you safely add another 8-10 or more psi you definitely feel the power increase.

If IAT's were to drop then the ecu will compensate for the extra air by using the air corrections table.

Another thing to consider is the knock killing effects of water would allow you to run the car leaner and still be safe. So even if the tune changed by adding water the water would protect it. (although.. again, in my experience the tune doesn't change)

Peter (rice) how much boost are you running on the 50/50 mix with what turbo?

[RICE RACING]

I have run up to 21psi, all tested with the best performance analysis gear on earth (Race Logic VBOX3i) and (no retune), but hey I am "sketchy"

I have customer in NZ with 8 sec drag car who runs 36psi same system set up and water meth (no retune)

Numerous cars in Australia, running straight methanol with water/meth in front of the turbo (no retune) all make more power, run faster, and last much much longer

When I get a chance I will try to scan this article that ran this exact same system (following all parameters I stated) that showed "massive gains" in on road performance V's no performance gain for post turbo. This has not changed since the last 100 years, everyone who has tried it who is qualified in mechanical engineering all agree and come to the same conclusions all others (not so smart or dare I say qualified to comment) call it a band aid

[dudemaaan]

Did you notice much change in AFR's with the methanol? And air temps? Does the decreased cooling inside the engine have any increase on knock? I was going to test mixtures of alcohol, but the water works so good and is free, makes me feel like there is little point. If I decide I want more power I just turn the knob on the boost controller clockwise.

[RICE RACING]

Originally Posted by dudemaaan

Did you notice much change in AFR's with the methanol? And air temps? Does the decreased cooling inside the engine have any increase on knock? I was going to test mixtures of alcohol, but the water works so good and is free, makes me feel like there is little point. If I decide I want more power I just turn the knob on the boost controller clockwise.

I have zero knock in my set up anyway so that was harder to quantify but I can reduce the rate of W/M compared to just water as it seems to be more volatile. The power 100% goes up, its a big difference.

Note: the tests I was doing all keep everything the same, so it was just different mixtures & effects on performance.

[FC3S Murray]

here it goes..................awaiting Brian's response....