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Old 12-02-2006, 01:20 AM   #1
BrigadoonB
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Default meth/alcy users.....better mpg?

I was wondering.....what kind of mpg changes do you see if you hook up a meth/alchy kit only?

IF you see any, please state what you are using (meth or alchy) and at what ratio.
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Old 12-02-2006, 02:28 AM   #2
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I'm running a coolingmist meth kit, and I do notice I get more mpg but I have no real data. The mpg will depend on the tune using meth.
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Old 12-02-2006, 07:00 PM   #3
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where are you getting your meth and at what ratio?
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Old 12-02-2006, 07:39 PM   #4
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I also run a coolingmist setup, however I see no added mileage per tank. The only time you use the alky, water, meth setup is at the boost/ timing/ volts you have it set for.
There is almost no way of getting better mileage with the kits because your injectors are still calling for the same fuel that you are tuned for and the only time you get additional fluid in the cylinders is at the set limits.
Now if you change your driving style you will of course get better mpg.
I get between 300 and 310 per tank.

Jay-R
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Old 12-02-2006, 09:03 PM   #5
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your lucky at 300 - 310 a tank....I'm around 200-230 a tank
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Old 12-02-2006, 09:20 PM   #6
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I don't run alc(even though I have tried it,,,), so take this with a grain of salt. Getting better fuel economy doesn't always mean more miles per tank. It's not hard to get better mileage at hard throttle with injection then without, but this often doesn't happen because most peoples top priority isn't saving fuel at hard throttle. That doesn't mean they're not getting a better fuel to power ratio though. Ie-People might not see that they're saving on fuel because they're using the same amount of fuel as b4 injection, but making more power. People might also not see that they're getting better fuel economy at hard throttle because they don't go to hard throttle very often.

I run just water, so it's a little different, but the same can be done with alc(maybe just not as efficiently, especially with the stoich a/f ratio of alc). I run 12.5 to 1 where I once ran 11 to 1. If I ran through a full tank of gas at hard throttle with injection and without on the same but different cars, I would probably have more then a gallon and a half of gas left in the car with injection when the car without injection runs out of gas, and the one with injection would make more power. With alc it's a bit different.... For what it's worth though, you should be able to get better/worse fuel economy and fuel to power ratios with different amounts of boost, timing, fueling, and injection.

peace

Last edited by hippy; 12-03-2006 at 01:18 AM.
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Old 12-03-2006, 01:29 AM   #7
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your lucky at 300 - 310 a tank....I'm around 200-230 a tank
Are you on boost 110% of the time?
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Old 12-03-2006, 01:52 AM   #8
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Having owned both a WRX and STi I can say the only way to get 300+ miles per tank is to do mostly freeway driving. Lucky to get 200 on either the way I drive, but with easy driving both would get 230 around town 300+ freeway. My OB gets 300+ around town, no way your WRX does unless you drive like a complete girl. In which case you should sell your car and buy a Prius.
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Old 12-03-2006, 01:54 AM   #9
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That's what I was trying to say about the 300 mpt comment. In a perfect world, an engine flows twice as much air at 15psi then it does at 0psi at the same rpm. At the same time, when we cruise, we don't really go above 3500rpm, and in a perfect world, our engines flow twice as much air at 7000rpm then at 3500rpm. Our engines also run a 17%+(difference between 14.7 to 1 and 12.5 to 1) richer a/f ratio while at 15psi. This means that we can use more then 4 times the amount of fuel within a given amount of time at 15psi then we do at 0psi, and we often run higher then 15psi at hard throttle, and lower then 0psi at part throttle. I've never really heard of anyone making more then 350 miles per tank, so if we went full throttle for the whole tank(15.5ish gallon tank ), we could end up getting a lot less then 100 miles per tank.

peace

ps-Prius' aren't so bad!

Last edited by hippy; 12-03-2006 at 02:03 AM.
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Old 12-03-2006, 02:14 AM   #10
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Depending on what psi you set your meth injection to kick on could also be the difference in mpg. Mine kicks on at 10psi, when I drive I go over 10psi often. The afr's were leaned out at 10psi and up. I feel like I have better mpg but have no actual proof to back it up, just feels like I go to the pump less often. I use cheap windshield washer fluid, it's a 60/40 mixture found at discount auto parts. Water injection is great for cooling and running higher psi without having to change injectors. As far as better mpg would be determined on the tune and how you drive, IMO.
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Old 12-03-2006, 08:23 AM   #11
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It sounds like you need a tune if you dont have one. I get almost the same mileage as stock, if you are getting that kind of mileage per tank you either have lead footed driving habbits or you need a tune.

Jay-R

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your lucky at 300 - 310 a tank....I'm around 200-230 a tank
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Old 12-03-2006, 08:35 AM   #12
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It all depends on your tune. I have said this before, if you feel you have to race every car you see or dump the clutch at every red light or drive so that you can hear your exhaust every place you go then yes you will have bad mpg.
If you get a road map out and look at Watertown, Ny you will see that we are on an intersate and it is a rather small city. Mostly open roads. I have 4 stop lights within 1 mile of my house and the rest is open highway.
I say again, if you are only getting 200 miles per tank you are driving like a maniac and will sometime crash your car or you need a tune, or if you have a tune you need to find a tuner who can properly tune your AF ratios and your injector duty cycles correctly.
About the girl stuff, well you should see some of my "legal" racing videos, I know my wagon is fast and properly tuned and modded in good taste, I have nothing to prove to any of the ricer boys around here. Once I recover from my surgeries and am able to AutoX again, " bring it on" I drive through Atlanta while visiting my inlaws in Birmingham and I am sure there are autoX courses in Atlanta. If not you can come to Birmingham to the Motor Park track.

Jay-R


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Having owned both a WRX and STi I can say the only way to get 300+ miles per tank is to do mostly freeway driving. Lucky to get 200 on either the way I drive, but with easy driving both would get 230 around town 300+ freeway. My OB gets 300+ around town, no way your WRX does unless you drive like a complete girl. In which case you should sell your car and buy a Prius.
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Old 12-03-2006, 11:21 AM   #13
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I.... There is almost no way of getting better mileage with the kits because your injectors are still calling for the same fuel that you are tuned for and the only time you get additional fluid in the cylinders is at the set limits.....

Jay-R
When running on pump gas, injection raises the effective octane, which can help us get better fuel economy when the injection is on with the correct tuning. This is one of the benefits of injection especially with our cars because they usually run rediculously rich at hard throttle, and having that extra octane/cooling allows us to lean the a/f ratio out a lot if we want. Depending on how much we go to hard throttle, how much we lean the a/f ratio out, and many other things, we will see varying degrees of fuel economy. In fact, it's probably easier to save fuel at hard throttle with injection then to measure the amount of fuel saved if the car isn't always driven at hard throttle. In short, there is a way, and this was my point.

peace

Last edited by hippy; 12-03-2006 at 02:36 PM.
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Old 12-03-2006, 03:22 PM   #14
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I average about 200miles per tank due to the cams - 22.5mpg was the best I could average using the cruise control at ~3000rpm from Jersey to Charlotte, NC. The only way I can see better fuel mileage running meth or alcohol is if you're injecting meth/alcohol most of the time, that's the only way you're injector duty cycle would be less than someone NOT running some sort of injection.

But you'd be pissing away meth/alcohol instead of gasoline.
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Old 12-03-2006, 04:12 PM   #15
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I average about 200miles per tank due to the cams - 22.5mpg was the best I could average using the cruise control at ~3000rpm from Jersey to Charlotte, NC. The only way I can see better fuel mileage running meth or alcohol is if you're injecting meth/alcohol most of the time, that's the only way you're injector duty cycle would be less than someone NOT running some sort of injection.

But you'd be pissing away meth/alcohol instead of gasoline.
But methanol is very inexpensive, sometimes you can find it for $.75 a gallon at Home Depot or Discount Auto Parts. I would only go with methanol if you're looking for a performance enhancer. Methanol isn't going to save you that much gas if any.
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Old 12-03-2006, 04:53 PM   #16
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I dont run boost 110% of the time and I've been tuned on Ecutek for some time now running on 18lbs on stock turbo. 200-230 is around the city......I almost made 300 on all highway though.

From the sound of things...the general concesus is that we might get better mpg but not much
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Old 12-03-2006, 05:53 PM   #17
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I say again, if you are only getting 200 miles per tank you are driving like a maniac and will sometime crash your car
Yes Dad. I'm 37yo and never had a wreck. Even when driven gently my car will top 230 mi/tank on the stock tune with shorty DP. Blah, blah, blah, blah, blah, blah. You drive like a grandma and should buy a Prius.

BTW, I do autocross.
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Old 12-03-2006, 07:41 PM   #18
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But methanol is very inexpensive, sometimes you can find it for $.75 a gallon at Home Depot or Discount Auto Parts. I would only go with methanol if you're looking for a performance enhancer. Methanol isn't going to save you that much gas if any.
Methanol for less than a buck a gallon?!? Damn.. I'm paying $30 for 5 gallons of pure methanol from the local race fuel distributor.
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Old 12-17-2006, 06:13 PM   #19
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hmmm....local race fuel distributor....it's obvious, they prey on people like you.
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Old 12-17-2006, 06:57 PM   #20
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Actually thats the going rate up here in the north.

Jay-R

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hmmm....local race fuel distributor....it's obvious, they prey on people like you.
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Old 12-17-2006, 08:01 PM   #21
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During the summer it's first come first serve for methanol, nitromethane, etc.. there's no place around here to get pure meth or any uber high octane fuels. Race season makes it a pain to score that magic juice.
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Old 12-17-2006, 08:16 PM   #22
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Pete, where you located in the TSR?

Jay-R

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During the summer it's first come first serve for methanol, nitromethane, etc.. there's no place around here to get pure meth or any uber high octane fuels. Race season makes it a pain to score that magic juice.
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Old 12-17-2006, 08:43 PM   #23
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The methanol I buy for $1 a gallon is not pure methanol. It's windshield washer fluid with meth in it.
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Old 12-18-2006, 06:43 AM   #24
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Pete, where you located in the TSR?

Jay-R
West Orange, New Jersey - exit 145 off the Parkway or 15w off of the NJTP. Or at the uber beginning of Rt 23.
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