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Old 07-20-2007, 12:11 AM   #1
garboplateNY88
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Post I have water/methanol injection in a 05 STI I have a question

Would this burn my engine out at 20,000 miles if I used this injection kit all the time on the STI. It spray at 23 psi and damn it's fast. So you recommend that I take it out it's not good for the engine.

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Old 07-20-2007, 08:33 AM   #2
ptirmal
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if you're tuned for it I don't see a problem
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Old 07-20-2007, 09:43 AM   #3
o2sys
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Are you asking if water/injection as a daily constant use will kill your engine faster?
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Old 07-20-2007, 11:22 AM   #4
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If anything I would say it will help it last longer as long as you are tuned for it. it is great for knock resistance.
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Old 07-20-2007, 01:25 PM   #5
JMK508
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ummmmm i wouldnt really say it will make your engine last longer. It also puts more strain on your engine.
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Old 07-20-2007, 03:51 PM   #6
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Quote:
Originally Posted by JMK508 View Post
ummmmm i wouldnt really say it will make your engine last longer. It also puts more strain on your engine.
if its tune for properly i dont think it puts any strains, is more like makes more power with less effort...
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Old 07-20-2007, 05:41 PM   #7
JMK508
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THink about this way. If you only can run lets say 18psi on pump. Then you throw alky on and you can advance the timing/increase the boost to 23psi. Its going to put more stress on your car.
Now from the other side, if you use it as a tool to get better gas mileage and you run the same amount of boost and timing and use it as a ultra safe percaution then by all means.
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Old 07-21-2007, 12:21 AM   #8
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IMO it depends on tune, and what YOU do. The root of the question needs to get to point of why W/A in the first place. If you add W/A to increase power and only tune to add power then yes you will increase wear and due to the nature of adding power (adding stress), accelerate wear...no real way around this whether this or another mod. Now if you look at what dumped fuel is doing (stock & un-tuned) and you look at what the benefit of replacing dumped fuel will do then I say you will ADD life or at least slow down the negative effects of dumped fuel without sacrificing performance = meaning if your not greedy with what you're looking to accomplish then you should see an enhancement in not only performance but in a cleaner combustion chamber burn.
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Old 07-21-2007, 01:38 AM   #9
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Quote:
Originally Posted by JMK508 View Post
ummmmm i wouldnt really say it will make your engine last longer. It also puts more strain on your engine.
Ummm


you dont seem to understand what the number 1 killer of STI engines is, and how alch injection goes MILES to eliminating that problem. Strain isnt the problem. These motors will hold 500whp with no strained parts issues. Broken ringlands are the killer, and they are caused by detonation, not strain from HP. You can break ringlands on the stock turbo at 17PSI and 300whp. ANd a lot of STIs have had spun bearing failures, pull the bearings out and what do you see? Flat spots hammered into them from det. Strain failures would be bent/broken rods, cracked or ovaled cyl walls and such. None of which are real problems on these motors.

Last edited by Davenow; 07-21-2007 at 01:48 AM.
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Old 07-21-2007, 01:41 AM   #10
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Quote:
Originally Posted by JMK508 View Post
THink about this way. If you only can run lets say 18psi on pump. Then you throw alky on and you can advance the timing/increase the boost to 23psi. Its going to put more stress on your car.
Now from the other side, if you use it as a tool to get better gas mileage and you run the same amount of boost and timing and use it as a ultra safe percaution then by all means.

detonation. One word. You either have it or you dont. You are more likely to have det at 18PSI on pump gas than you are to have it at 23 on alch. 23 PSI isnt what kills subbie motors. Detonation kills them. Eliminate the det, and you will greatly extend the life of a upgraded turbo subby motor.


I ran 22PSI on my 05 STI on the stock turbo, 5 deg more timing, and a leaner a/f. It was tuned in Boston, and I drove it to texas, where it was 107+deg for the first 2 weeks I was there. I had exactly ONE minor det incident during that time. No one on pump gas an 18PSI down here during that week could say that.



If you are going to run the same a/f, boost and timing, then alch isnt right for you. You dont need alch to do that without detonation. You just need a good tune, dont use alch as a band-aid for a bad tune (although many people do, especially some "professional" tuners, who take a car they cant seem to eliminate knock on, slap alch on it, gain half of what they should from the alch, then act like gods because they picked up 15whp and eliminated the det )
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Old 07-21-2007, 02:31 AM   #11
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you have utec... why not just make two maps and put an inline switch for the meth. i did and it works great. meth when i want it.
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Old 07-21-2007, 05:39 AM   #12
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technically, even with zero detonation, the more timing present in each combustion cycle, the rod bearings will experience more compressive and tensile loading. Granted, it's nothing they can't handle, but it's worth noting nonetheless.
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Old 07-21-2007, 08:11 PM   #13
garboplateNY88
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Quote:
Originally Posted by krambte79 View Post
you have utec... why not just make two maps and put an inline switch for the meth. i did and it works great. meth when i want it.
This what you mean: I should buy this.

Remote Map Selector for UTECThis remote switch allows you to switch UTEC programs on the fly. Switch with the touch of a button from street program, to race program, to valet mode, to security mode, all without leaving the driver's seat. (The UTEC has up to five different maps, plus valet and security modes.) Comes mounted to a factory switch blank so you can plug it directly into your dash or center console, no cutting or drilling required. $79.00
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