Switching to E85... keep the water meth injection or not?

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adamky
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Switching to E85... keep the water meth injection or not?

Post by adamky »

So, I've been running 93 oct + water/meth injection for a while now. I've decided to switch to E85, but I can't decide whether to keep the water meth injection, or just run without it.

I know E85 by itself will work fine because of it's high octane. But, I kinda like the cooling effect the water meth has on the intake charge. Also, since I spray the water meth pre-supercharger, it helps to seal the rotors and I usually get an extra 1-2 psi of boost.

Anyone have any thoughts on this? Overkill?
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Post by supakat »

Better to be safe than sorry. Extra protection if you ask me. Also, since it generates 1-2lbs more, why not?
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Post by TryingToTurbo »

Plus even lower intake temps for even more timing/power.


I like to think of it like this, STi/EVO guys are intercooled and still add water meth for more power. That's basically what you would be doing where e85 would be your 'intercooler' in comparison.
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Post by body80 »

I'm not completely up to date on E85 tuning and I remember seeing something like you need 30% more fuel running E85 then you do running gas.

Since you're running more fuel and on top of this plan on running meth/water is there any chance of hydro locking the motor?

At what point does that become a concern?
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Post by nismoautoxr »

in my car when I switch tables it works out to more like 20-25% more for E85.

To the hydrolocking question...Im not sure . I guess its possible since you're going to be adding more fuel but Id be inclined to say it should not be a factor but then again Ive not run the combination .
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Post by adamky »

Thanks for the advice. I did some searching online and this has definitely been done before. I think I will run both. I may run a little less methanol in my tank than I do with 93 octane though. I run 50/50 now. I'll probably try 30% meth and see how that does.
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Post by airman »

If the spray is atomized enough, then no, it couldn't hydrolock your motor unless it literally pours into the cylinders in liquid form. The water/meth will immediately flash to steam/a gas and lower combustion temperatures as soon as it hits the cylinder.
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Post by sik_z33 »

I say why not. As you and other people have mentioned lower intake temps is always a good thing and you can't ever be too safe so i would try it both ways to see if the advantages warrant running both. Do you monitor you intake temp?
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Post by klattr1 »

Here's my advice...tune for the E85 but don't tune for the water/meth injection (meaning don't add timing or lean it out when using it)...that will keep the setup safe and reliable.
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Post by adamky »

klattr1 wrote:Here's my advice...tune for the E85 but don't tune for the water/meth injection (meaning don't add timing or lean it out when using it)...that will keep the setup safe and reliable.
That's what I was planning. I want to use the water meth as an extra measure of protection and to get the extra 1-2 psi of boost.

Thanks for the advice everyone. I really hope to get this thing running on E85 and get it dyno'd within a month or so.
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Post by emo_tactical9 »

body80 wrote:I'm not completely up to date on E85 tuning and I remember seeing something like you need 30% more fuel running E85 then you do running gas.

Since you're running more fuel and on top of this plan on running meth/water is there any chance of hydro locking the motor?

At what point does that become a concern?
When you are using a hose as a fuel injector.
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Post by adamky »

sik_z33 wrote: Do you monitor you intake temp?
I do have a PLX air intake temp gauge. I don't have a way to log it, but I can glance at the gauge during a wot pull.
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Post by klattr1 »

adamky wrote: I do have a PLX air intake temp gauge. I don't have a way to log it, but I can glance at the gauge during a wot pull.
Where do you have the sensor mounted? post or pre-meth?
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Post by adamky »

Post meth. It's mounted to the top of the supercharger plate.
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Post by TryingToTurbo »

adamky wrote:Post meth. It's mounted to the top of the supercharger plate.
Wouldn't it be pre-meth now that you have your nozzles mounted on the runners?

What kind of temps are you seeing?
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Post by adamky »

I am no longer running the individual port setup since I am switching to E85. I just have one 175 ml/min nozzle at the supercharger inlet. The air temp sensor is mounted in the supercharger plate, kind of between runners 1&2.

I haven't driven the car a lot because I have still been working on little issues here and there, such as vacuum leaks. I've seen the temps get over 200 on a hot day. Most days, they run around 160 degrees. I have not had a chance to see if the temps drop with the water/meth setup running and full boost.
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Post by torch'd »

adam i know ur setup is well developed. wondering y u placed it there??? ive been monitoring things on my sohc and noticed 3&4 are significcantly hotter thats y i ask.

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Post by adamky »

The supercharger outlet blows up directly at cylinders 1&2. I guess that's why I put it there...? Also for convenience. It's a pain to get the sensor in and out of the manifold due to the way the wire kinks as I'm threading it in. I have to remove the glovebox and pull all of the wire through the firewall when removing/replacing it. It would really be tough if I had it between cylinders 3&4.

Here's a recent pic to show where it is. It's that wire with the red part on it coming up between the runners:

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