i am planning to install my water/methanol injection kit. i have seen different ways for calculating the jetting size and have got different results. some take into consideration the IDC, others don't. others add 10% for system loses.
if anyone knows what route to choose that would be best for jetting calculation.
am planning to run 34 psi boost on 75% methanol with 22-23% desired fuel to be injected. i have now 1200 injector size with 70% IDC. am using old shurflo pump which i guess flows at 125psi.
i have 3 jets of sizes 1gph(63cc/min), 9gph(567cc/min) and 10gph(630cc/min)

thanks

 

What system are you using?

 

labonte ISG-S3

 

anyone!

 

Out of the jets you listed; put the 1gph at the exit of the intercooler and put either the 9gph or 10gph 8-10" away from the throttle body. You won't notice a difference between the two jets power wise.

 

how did you do the calculation? if any other jet size is needed , i would buy it; am not just bounded by those.
isn't is better to put the bigger jet the farthest ?

 

106 reviews...

 

https://www.evolutionm.net/forums/wa...alculator.html



I'd say if you're running a 6262 go nuts and run the two bigger jets, one several feet from the TB, I ran mine right near the clutch slave cyl (on the UICP obviously) and then the other about 6" from the TB. This is the setup I ran on my BBK Full and it was overkill but with 50/50 it was a nice balance of safety, knock quench, and intake charge cooling.

 

i tried the calculator before and this was my concern since this method got me different number than other calculations on the forum. according to the calculator( assume 50/50 mix, 1200 inj, 75% idc, 34 psi boost, 18% desired fuel to be injected) i get 1265cc/min total flow.
according to simpler calculation they usually get the 1200 x 4 =4800 x 75% =3600 x 18%=648cc/min total flow.
in other thread according to http://howertonengineering.com/tech-...ating-jetting/ i get 950 cc/min total flow.(here they are not considering IDC and they add 10% for system loses)
so which one do i choose?

 

I would use the method outlined by Howerton engineering. The HFS 3/5/6 will automatically work to adjust itself to IDC so it is easier to simply calculated it at 100% and let the system scale it down for you.

 

i am using the labonte isg-s3 kit, where i input my idc so it adjust itself. but i dont know how smart it is. however i did not understand the addition of 10% for the loses in the system. like what are the loses?
what would you recomend the percentage of water to methanol mix? ( taking into consideration am not using direct injection on the manifold runners , but two nozzles on the uicp)

 

The 10% for is for mechanical losses. Is is to account for the loss in pressure as the fuild travels through the line, gravity, the pumps friction, the length of line and how it is run, etc.

I use 100% methanol. It makes great power. Think of it like E85 except that you don't use it all the time. Since it is used as a secondary fuel source you will not make as much power as you could using it for primary fuel injection (like E85). I prefer it because I don't have to use it all time. It is only there when I am getting on it. The rest of the time my system simply waits while I run pump. I use 100% methanol so I don't have to worry about the mixture, etc. Downsides it is very flamable and toxic. It is stored in the trunk. I have a bumper vent knock out to help with ventilating the trunk.

I would place the nozzles in the uicp about 6-18" inches away from the throttle body. This way the methanol will have plenty of time to atomize. Put the largest nozzle farther away. I have my jets set about about at 12" and 18".

 

i agree about having 100% methanol. but am trying to find the best combination between water and methanol to get best result in terms of increasing octane and some cooling effect.
what afr you target when going 100% methanol?
am planning to target 11-8-11.9 afr.