Just wondering what kind of timing some of you are running when running meth.

How much psi , how much timing , and if your spraying straight meth or a mix?

 

50/50 ,375ml nozzle, 22psi i test a best of 22 degrees afr 11.8 made 375 hp stock evo8 turbo,hks 272cams. ran a best of 11.9-115mph on stock radials. hope it help you.

 

Is this a AEM tuned machine?

Just curious some of the different ideas on timing / boost / meth

Thanks for the response I will see how that compares

I assume that 22 degrees is at peak rpm correct??

 

21-22 degrees at 7500 rpms, and 8 at peak torque. This is on a 50 trim at 28#'s, spraying pure meth on 93 octane pump. The meth spray equals about 20% of the fuel injector flow using an aquamist system that mirrors IDC.

Tuned using Ecuflash

 

wow , thats alot of timing for that much boost but hey if it likes it so be it.

I would have thought that would be a 50/50 mix with water with that much timing slowing the combustion process

 

20% is a rather large shot of meth. Forgot to mention a/f's are 11.7-11.8 through the power band. Less timing might allow me to get closer to 12.5, which a lot of people say should be the goal of spraying water and where peak power lays. I haven't had time to dyno the various settings between meth and water and timing and a/f. I've gravitated back to my warm and fuzzy a/f comfort zone.

It's hard to find a concensus on what's better.... water, meth or a combination. Personally, I think it's very dependent on ambient conditions and fuel quality. Crappy fuel, humid conditions, increase meth percentage to raise effective octane rating. Good fuel, low humidity, increase water percentage to lower detonation threshold. Living in Houston, where it's 100% humidity almost daily, I choose 100% meth.

No knock according to evoscan at current settings.

 

I have just started sprayin meth myself and have had mixed results but I think I am on to something. leaning it out some definitly helped it out just raising the a/f from low 11's to the mid to high 11's it has gone 2 mph faster in the quarter knock only after shifts so I think I need to adjust the fuel acceleration rate ??

I am just concerned about getting into trouble with timing although right now my peak timing is only 10 deg at 7700 rpm at my 28 psi breakpoint

Dont know if that is low , normal , or what ??

 

You are doing good on ign timing, if you are knocking in between shifts you might need to tune your turn on point as said. I can usualy shift fast enough that the alky never turns off. My turn on point is at 11-12psi. I also have the alky wired into the ems so the map isn't altered until the kit is making pressure.

 

what pin # did you use to activate your nitrous control??

 

I used Pin #53 into the EGT#2 input, I then use Switch #7 to use EGT#2 and activate the switch above a certian voltage. Then monitor the switch on the NO2 side for activation. You can read about it at the post below.

https://www.evolutionm.net/forums/sh...d.php?t=151383

 

I played with timing from 17 all the way up to 29 degrees on my stock turboed evo8, afrs from 11.0 to 12.5 and boost from 22psi to 29psi and I seemed to trap the best on about 23 deg, 12.2 afrs and 26psi with 50% meth...car trapped between 115-117...

 

great stuff thank you

 

wow I am realy amazed at some of the timing some people can run , even with the 50/50 mix , that is alot of timing . Its hard to believe it dont knock

 

GTVEVO I have read your link it is very informative. I am also using the smc kit but also utilizing an aquamist dds3 flow sensor and brain box. I use a mbc for boost control so I will be using a solenoid valve to drop to wastegate pressure if there would be a pump failure.

I feel safest this way as I might not catch the failure quick enough in the heat of the moment so peace of mind.

So I ask you if you think there is still an advantage to tuning thru the nos map even with use of the other failsafe in case of failure??

 

You can run any safeguard you choose that is up to you but the advantages of tuning the car with the NOS altering maps and knowing the exact turn on point also allows for another stage of safety. When I first starting tuning alky injection the first bad thing I noticed was every kit seems to have some sort of latency with the turn on point. When you feed the pressure switch voltage you no longer have to worry about this because with activation of the switch and knowing for sure the pump is making pressure the NOS maps engage and correct your fuel and ign timing to have the safest tune in any situation. I hope this makes more sense and I would recommend doing this with any add on injection kit.