Ask your water alcohol injection questions here. - Page 6

GS-T_Newboost · 04-29-2008, 11:14 AM

i got a realy good deal on a snow performance kit and i was woundering if it would be a problem mount the resiovor and pump in the engine bay?

crimsondragon · 04-30-2008, 02:01 PM

Don't know if this has been answered yet but since meth/water injection increases the octane rating, does that mean I can run regular (87 octane) and essentially have it be premium (93+ octane)?

turboglenn · 04-30-2008, 11:18 PM

Quote:

Originally Posted by crimsondragon

Don't know if this has been answered yet but since meth/water injection increases the octane rating, does that mean I can run regular (87 octane) and essentially have it be premium (93+ octane)?

I mentioned this once nad was tolf to still not do it. I wasn't given an explanation though. My guess is try it and monitor knock, it probably won't be as good as 93+meth but it should be better than 89 i would guess

Devilsown · 05-02-2008, 10:23 AM

The raising of the octane is very min. Remember you are only injectiong 5-10% methanal at 116 octane and 1/2 of it should absorb into the air before it hits the cylinders. now having the cooler intake air temps you do lower the oct requirement for the motor.

romeen · 05-02-2008, 11:19 AM

Quote:

Originally Posted by crimsondragon

Don't know if this has been answered yet but since meth/water injection increases the octane rating, does that mean I can run regular (87 octane) and essentially have it be premium (93+ octane)?

Also, the injection is not operating all of the time. Most guys set theirs to activate at about half of their max boost. Like Glenn and Chance are saying you should still run the recommended octane in your car.

crimsondragon · 05-02-2008, 04:12 PM

Ok thanks. One last question. I'm running an EBC on my car and it has a pressure sensor hooked up to the line between the fp solenoid and the manifold. Will running injection cause damage to it?

romeen · 05-02-2008, 04:22 PM

I don't think it will. I also have an EBC with my pressure source hooked up the way that you do. I have had my WI system for almost a year now and have had no problems with my EBC (or it's built in boost/vacuum gauge).

Devilsown · 05-09-2008, 02:28 PM

It should not cause you any problems.

dsm-onster · 05-09-2008, 05:56 PM

Quote:

Originally Posted by romeen

Also, the injection is not operating all of the time. Most guys set theirs to activate at about half of their max boost. Like Glenn and Chance are saying you should still run the recommended octane in your car.

To me, this is 10000% of the reason why one should run their best octane readily available. Glenn already proved that water/meth injection is inconsistant for daily driving. Water and/or meth injection can raise the INSTANTANIOUS, effective octane (seen by the cobustion chamber) upwards of 110 octane. Because it slows down the burn rate of the fuel being used. But there needs to be a consistant supply of this rating. As MOST or all tunes have either HIGH part throttle timing from a piggy back system or a good amount of boost before the injection is cut on.

Having the injection cut on at a later point in the boost/rpm curve is advantagious because more power can be extracted before injection. As injection always takes SOME power away vs running straight C16 or similar (like pure methenol). But you have to cut it on earlier with a lower octane fuel.

soldave · 05-25-2008, 09:56 AM

Have been installing the Stage 2 universal kit (voltage-controlled) on my Mitsubishi Evo 1 today. All went well except I foolishly forgot to order the 3-bar MAP sensor to go with it. I thought the voltage controller would work but I didn't know beforehand that my MAF operates by a Karmann Vortex system, which gives a signal in Hz and not voltage.

I know that the GM 3-bar MAP sensors are recommended for DSM cars (and therefore my Evo 1 too). But someone I know has a 3-bar MAP sensor that was connected to an Apexi Power FC. Will this MAP sensor suffice or does it have to be a GM one?

I hope you can see my situation and I thank anyone who can offer me some advice in this matter

Joesmoke · 05-25-2008, 04:02 PM

Ill go out on a limb and say that most 3 bar map sensors should operate the same.

The principal being translate pressure to voltage in a linear form.

HTH
Jason

Joesmoke · 05-25-2008, 04:09 PM

Quote:

Originally Posted by dsm-onster

To me, this is 10000% of the reason why one should run their best octane readily available. Glenn already proved that water/meth injection is inconsistant for daily driving. Water and/or meth injection can raise the INSTANTANIOUS, effective octane (seen by the cobustion chamber) upwards of 110 octane. Because it slows down the burn rate of the fuel being used. But there needs to be a consistant supply of this rating. As MOST or all tunes have either HIGH part throttle timing from a piggy back system or a good amount of boost before the injection is cut on.

Having the injection cut on at a later point in the boost/rpm curve is advantagious because more power can be extracted before injection. As injection always takes SOME power away vs running straight C16 or similar (like pure methenol). But you have to cut it on earlier with a lower octane fuel.

I always run 94 octane, but do have my injection come on at 2 psi. I like the fact that while in boost, theres always straight meth there.

The other reason that I do it like that is because if I have injection coming on at say 10 psi, I already have a hot intake charge, and if my knock threshold is say 15 psi, I do not have much elasped time to get that meth in and the charge cooled.

I also run with no KS, so that helped with my decision to always have injection.

After some more research, I realized i probably was giving up some low boost power, with the tradeoff being a little more safety.

Jason

soldave · 05-25-2008, 09:28 PM

Quote:

Originally Posted by Joesmoke

Ill go out on a limb and say that most 3 bar map sensors should operate the same.

The principal being translate pressure to voltage in a linear form.

HTH
Jason

If it's any help, the PowerFC MAP sensor would be a Denso one:

Denso DPS-310-2000A
949940-6270 5V

gorf · 09-12-2008, 08:36 AM

Simple question, does anyone use e85 in their injection unit? how does it compare to 50% water/meth?

Devilsown · 09-12-2008, 12:29 PM

You can not run E85 thur these systems. The gas thats along with it will harm the seals.

We recomend only running E100 thur the system.

soldave that map sensor should work. 95% of all map sensors work from 0-5v they each just have a differnt scale.

H82lose91 · 09-12-2008, 01:29 PM

Id just like to add that running meth injection is not inconsistent, i have log after log showing the opposite. Maybe you guys arent doing something right. I have been running meth on cars for years, and i can say that some sort of progressive control is necessary to have consistent results. The old school hobbs balls out setup is only good if your WOT all the time. With the progressive and proper tuning the transition onto meth should be seamless. And if thats the case the end results should be the same pull after pull.

In my opinion you need either an AEM, MAFTPRO, or DSMLink to properly be able to tune the transistion and have the proper fail safes in place. Otherwise you are playing with fire.

Nothing against Glenn but my findings and his seemed to differ quite a bit. I posted them in his thread as well when i was doing my sidemount testing.

soldave · 09-13-2008, 08:35 AM

Quote:

Originally Posted by H82lose91

In my opinion you need either an AEM, MAFTPRO, or DSMLink to properly be able to tune the transistion and have the proper fail safes in place. Otherwise you are playing with fire.

Plenty of other ways to tune it. An Ostrich and Tunerpro RT software is one such method (and the one I am using)

Quick meth question. What equivalent methanol percetnage would these mixes equal (a couple of options here in Japan)
75% methanol/25% ethanol
75% methanol/25% isopropyl alcohol

H82lose91 · 09-16-2008, 10:55 PM

Yeah but to my knowlege the stock ECU doesnt support secondary, or aux fuel/timing maps. So what happens when your not running meth or theres a failure?

I used to run a SAFC, and a hobbs switch. It worked, but there was no failsafe.

soldave · 09-16-2008, 11:06 PM

Or you just jig up a small warning light into an LED for your dash so you can see if anything's going wrong. And the early Evo ECU at least comes equipped with 5 timing maps and 4 fuelling maps I think. Don't know what triggers them, but they have them in the binary code.

soldave · 09-18-2008, 06:45 AM

Can someone check this maths for me as something doesn't seem right. I used to be good at maths but I just can't get my head around this one.

So in the past I have been using a 95%/5% meth/eth mix, and I have been mixing that with 25% water. So overall I have had:
71.25% Methanol
25% Water
3.75% Ethanol

If I am using bottles of methanol/ethanol in a 75%25% mix, how much water should I be adding to make it pretty much equivalent? I did some equations using latent heat values for methanol, ethanol and water, and came up with 73% meth/eth mix and 27% water, but I was expecting it to be higher. Do those figures sound right?