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Old 10-16-2006, 01:42 PM   #1
rebos123
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Default How much EGT drop with WI?

I am running a coolingmist system with 50/50 meth and h20 on my 05 WRX.
What sort of EGT drop should I expect if I am running the system to come on at 7psi min and 15 psi max with a tune of 4? On a long 3rd gear pull I still see my EGT hit 1600F, although it hits that near the end of the pull. 4th and 5th gear pulls only hit around 1450 to 1500F. I know the system is spraying due to fluid drop in the reservoir tank.
I have not had my car tuned to take advantage of the WI yet.
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Old 10-16-2006, 02:25 PM   #2
flycaster
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I saw a drop of about 150 degrees at the same boost levels, but that is with tuning. Just a word to the wise: it's OK to run straight water without tuning (you'll just drop power and temps), but I wouldn't recommend running 50/50 - you're gonna have pig rich AFR's when the injection is on since the ECU has no clue additional fuel is being added.
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Old 10-17-2006, 11:33 AM   #3
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It all depends on your tuning, you could actually have higher egt's if you weren't careful....
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Old 10-17-2006, 01:44 PM   #4
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^^Very true. The fact is most folks will use the injection to run higher boost to take advantage of the cooling effects. Depending on how high you push it, you're probably looking at close to the same EGT's. However, you do get the "steam clean" benefit regardless.
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Old 10-17-2006, 03:38 PM   #5
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Quote:
Originally Posted by flycaster View Post
I saw a drop of about 150 degrees at the same boost levels, but that is with tuning. Just a word to the wise: it's OK to run straight water without tuning (you'll just drop power and temps), but I wouldn't recommend running 50/50 - you're gonna have pig rich AFR's when the injection is on since the ECU has no clue additional fuel is being added.
Not to change the subject, but imo it's probably better for the engine to run 50/50 then all water without a tune, because at least alc can possibly be lit. I think most people just do water cause they don't wanna waste money on alc when they know they're just gonna lose power....

The amount of degrees the egt's lower depends on many things. They will generally be higher at higher rpms given all other things being equal(even without injection). This is cause of many things, but with a single stage injection kit which has a flow based off boost(like yours probably is), the injection to fuel ratio(and probably air to injection ratio) will get lower as the rpms go up. Because of this, the tuner will most likely have to run a richer a/f ratio uptop then midrange, which will push the injection to fuel ratio even lower. In turn, the injection will not have the same effect at higher rpms as it does midrange. Choosing the right nozzle could be one of the most important parts of a single stage injection kit, and the egt's would mostly likely reflect that when the nozzle flow is changed(given all other things being equal).

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Old 10-17-2006, 03:47 PM   #6
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Why have you not gone to get it tuned. Your car is probally running pig rich right now. I would disconnect the system until you can get it tuned.
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Old 10-17-2006, 04:30 PM   #7
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Originally Posted by hippy View Post
Not to change the subject, but imo it's probably better for the engine to run 50/50 then all water without a tune, because at least alc can possibly be lit. I think most people just do water cause they don't wanna waste money on alc when they know they're just gonna lose power....
Boy, I'm not sure where to begin.

First, we'll just have to agree to disagree on the issue of injecting alcohol (a fuel) with no tuning. It has nothing to do with whether or not it can be "lit", rather the AFR's will go really rich.

As for your second sentence, it seems you're suggesting that alcohol injection will lead to a power decrease. That's nonsense. If properly tuned for the extra high-octane fuel, the increase in power is substantial and has been clearly documented in hundreds of dyno tunes.
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Old 10-17-2006, 05:27 PM   #8
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If people inject water instead of alc, they still have the same air/liquid ratio as if they were injecting alc(or pretty close ), but with liquid in the mix that has no chance of ever igniting. Just cause it's not fuel, that doesn't make injecting it any better for a running engine then injecting the same amount of fuel. It's like people think they can pour a gallon of water in their engine and nothing will happen. This is obviously not the case.

On the note of alc leading to less power, I wasn't saying that people lose power with alc injection or comparing it to water in power potential. I was noting that when people inject something like alc or water without a tune, they generally lose power.

peace

Last edited by hippy; 10-18-2006 at 01:03 AM.
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Old 10-18-2006, 02:05 PM   #9
rebos123
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Quote:
Originally Posted by JMK508 View Post
Why have you not gone to get it tuned. Your car is probally running pig rich right now. I would disconnect the system until you can get it tuned.
Based on what I have read, if I am spraying a minimal amount of fluid (50/50 H20 and meth) into my engine then it provides me with, at a minimum, some detonation prevention. If I start really pouring the fluid into the intake charge then I start running into issues, eg cylinder wall washing, engine pulling timing, etc...
My car is probably running "pig rich" when the WI system is running, which is only when I am in boost >7PSI. So what? I don't see how the ecu is dumping in any more fuel during boost. The rich AFR would be coming from the "unburnt" fluid from my WI. If this is a minimal amount, then how is this hurting anything?
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Old 10-18-2006, 04:34 PM   #10
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Imo if you have the stock wrx injectors and are using a nozzle that came with an adjustable coolingmist kit, you cannot possibly be running "a minimal amount of liquid". It might be a good idea to have your car tuned before running injection.

peace

Last edited by hippy; 10-18-2006 at 05:16 PM.
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Old 10-23-2006, 08:22 PM   #11
flycaster
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Quote:
Originally Posted by hippy View Post
when people inject something like alc or water without a tune, they generally lose power.
Agreed, 100%. It just makes me cringe a little when I hear about people injecting alcohol without tuning. The ECU doesn't know the fuel is there - not good, plus you're leaving a boatload of power on the table.
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