Quote:
Originally Posted by dudical26
what jet size changes do you think would be needed?
Also what intricacies are there to tuning 50/50 compared to meth.
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Nothing I know you can’t handle or figure out
What jet sizes are you currently running? Where are they located? You know how every evo tunes a little different? What they can handle for timing ect ect? Same goes for injection, you have to find YOUR particular cars liking of 50/50 to make more power than 100% meth. So there’s no true answer for you, your car and set up might like a 20% injection to fuel ratio or a 30% to fuel ratio. I have seen some cars take up to 59% injection to fuel ratio to see the best power from it!!! It just all depends on you, the time needed to find it, and what your car wants.
You need almost, but not always twice the amount of 100% meth as a 50/50 mix to see the same "cooling" effect. Also how the jets are placed can cause a slight effect on the size needed as well. Further away from the intake manifold would require a larger jet as more will be evaporating from the high charge temps.
Tuning 50/50 isn’t like 100% meth, in that 100% meth is like tuning a evo with a big intercooler and 105 octane. Its pretty basic, turn the boost up and the timing lean it out a bit to make up for the extra fuel and your making power. Easy...
H2O you need to first turn the boost up to what you want. Then with water you have to add 1-3 degrees of timing to make up for the loss of burn. Next you need to lean it out more so than normally used to, Evo IX's tend to like 12.5 AFRS at a 50/50 mix towards peak TQ. EGT gauges come in handy here, to show the benefit of the H2O. (No way should this tune be set up for road racing, perfect for street and drag) Then add timing, pump it up...
After many jet changes and many holes in my UPIC I agree with Richard in the fact that 50/50 is the way to go! Not only are your pistons running 40-50 degrees cooler than with 100% meth, you can make as much or more with 50/50! Plus its not nearly as corrosive and the tank last longer too!
There is a sticky at the top of the water injection forum on this site, Injection mixtures 101. Has some other info too.
GL
Evan Smith