Water/Meth Injection
02-25-2015, 05:11 PM
#21
It helps the rotors seal primarily and cools them secondarily. Blown alcohol cars run this way with a small injection pre blower and most post blower (pro-mod style cars). It should be well proven from that stand point
Wow 28 degrees is a ton of timing. I run more timing than the stock LS2 across the board but I am nowhere near 28 degrees at full boost. I'm around half that right now (still playing with things).
02-25-2015, 09:20 PM
#23
I've seen lots of debate on that subject. The intercoolers/aftercoolers are most efficient when the temperature gradient is the greatest which supports your statement. The flip side to that argument is that compressor efficiency is dramatically increased when injecting pre-compressor. I don't have direct experience with meth so I can't provide any conclusive statements. My expectation is that it will come down to the details of the specific system.
For example if the intercooler is undersized or inefficient then injecting post intercooler makes a LOT more sense as the charge temp will still be elevated and therefore benefit from the additional cooling.
A conflicting example is in the case where the compressor is undersized but has a good intercooler. In this case the system may benefit more from the bump to compressor efficiency than it would from additional charge cooling post intercooler. IMO that is why you see so many conflicting opinions.
For example if the intercooler is undersized or inefficient then injecting post intercooler makes a LOT more sense as the charge temp will still be elevated and therefore benefit from the additional cooling.
A conflicting example is in the case where the compressor is undersized but has a good intercooler. In this case the system may benefit more from the bump to compressor efficiency than it would from additional charge cooling post intercooler. IMO that is why you see so many conflicting opinions.
To sum this up however, if its Methanol injection placement is to alleviate a supporting items deficiency, weather it be intercooler (too small or design (bar/plate) etc) OR to move air charge back to the ideal compressor efficiency range...
The details of the specfic system is then & the bottom line is simply a) wrong intercooler choice was made or b) wrong choice of compressor for the build. If these items were of 'good choices', we would be back to injection at throttle/IAT.
03-01-2015, 12:10 PM
#26
I used the original windshield res, and installed the pump on the backside of the front bumper...
Snow max mpg controller and connected to the injectors. I used the maf to activate the pump once temps raised above 70f and put the iat just before the tb...this way i run full timin on hot days above 17% inj duty...
Snow max mpg controller and connected to the injectors. I used the maf to activate the pump once temps raised above 70f and put the iat just before the tb...this way i run full timin on hot days above 17% inj duty...
03-03-2015, 10:04 PM
#27
Has anyone added an octane booster to the injection mix? I was thinking about doing a small injection of torco or similar. Use a really small nozzle then inject torco on a boost switch to allow timing. Then you still have knock sensors in case something fails instead of it going lean. Maybe this is completely stupid...
I have no idea on the materials compatibly though.
I have no idea on the materials compatibly though.
03-04-2015, 09:13 AM
#28
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I'm not familiar with torco. But methanol is an octane boost, which is partially the reason I am running it. Other being iat drops, I just had my torque app the other day (no hp tuners, yet) read me a a 107 iat after I hot lapped and heatsoaked the crap out of it. Which only was about 140 or so sitting and cruising. But wot was 107..outside air of 70
03-04-2015, 08:20 PM
#29
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Has anyone added an octane booster to the injection mix? I was thinking about doing a small injection of torco or similar. Use a really small nozzle then inject torco on a boost switch to allow timing. Then you still have knock sensors in case something fails instead of it going lean. Maybe this is completely stupid...
I have no idea on the materials compatibly though.
I have no idea on the materials compatibly though.
03-05-2015, 05:30 PM
#30
I ran a meth injection system in my last car (06 Subaru Legacy) for nearly 7yrs. I daily drove it, summer heat, extreme winter cold, I tracked the heck out of it, and took long family road trips with it. Aside from a pump failure and a leaky 90* fitting, I never had any issues. I ran regular blue washer fluid from the OEM washer fluid tank. The convenience and reliability of running a 20-25% meth solution found in standard washer fluid (available anywhere at anytime) trumped the performance gains of aftermarket blends or homemade cocktails, for me anyways. I ran a specific tune for the meth system that added a little more timing and boost due to the increased knock resistance and pulled a little fuel because of the added octane, but it was still largely conservative and wouldn't grenade my motor instantly if the system and failsafes failed. I made about 40/40 additional hp/tq at the wheels in an AWD car with a tiny turbo. Loved the fact that my car pulled just as hard on the track at the end of a 20min session in 100* heat as it did on a cold fall day. I'll definitely use meth injection again if I find myself with another forced induction daily driver. The V is my first NA car is a long time.