Mos68x
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Ok, I thought I would start a thread for my water/methanol injection install on my non-aftercooled 6CTA8.3 now that I’m done with the rebuild and this doesn’t really fit in that thread.
Thanks to a couple people I got the necessary info to get a good idea of the max size nozzle I needed for this application. Using Snow Performance’s nozzle selection guide, it looks like it’ll be a max of 375ml/min. Now here comes the tricky bit, I’m planning on having two separate water circuits. One for pre-turbo wet compression to help with boost lag at my high elevation (6000’). And the second will be solely for controlling EGTs.
I am torn on deciding how to control the first circuit. The first option will be inputs for RPM and boost pressure for a Teensy microcontroller to control duty cycle on pump. The second option will be purely mechanical in nature, with just a “boost sensor” line running from post-turbo to the water tank, which will pressure the tank and spray the water that way. Hopefully that way it’ll have only what is necessary to deal with the heat from compression. The second will be based solely on EGTs now that I have the EGT gauge installed and working. I’m not 100% sure that using this approach will deal with the boost lag, but I’m sure that I dial in a little extra at low RPM on the second circuit to help with that.
I've already sent an email to Snow Performance regarding individual nozzle sizes. Right now I’m thinking a single 100ml-175ml nozzle for the pre-turbo circuit and twin 100ml nozzles for post-turbo. That should put me a total of 300ml-375ml total injection, which according to their chart is what I’ll need for 250hp at 25+psi boost. We shall see what they say before I order any nozzles. Of course this means I’ll have to remove the intake manifold I just welded up so that I can add a couple threaded bungs for the nozzles, but oh well.
Thanks to a couple people I got the necessary info to get a good idea of the max size nozzle I needed for this application. Using Snow Performance’s nozzle selection guide, it looks like it’ll be a max of 375ml/min. Now here comes the tricky bit, I’m planning on having two separate water circuits. One for pre-turbo wet compression to help with boost lag at my high elevation (6000’). And the second will be solely for controlling EGTs.
I am torn on deciding how to control the first circuit. The first option will be inputs for RPM and boost pressure for a Teensy microcontroller to control duty cycle on pump. The second option will be purely mechanical in nature, with just a “boost sensor” line running from post-turbo to the water tank, which will pressure the tank and spray the water that way. Hopefully that way it’ll have only what is necessary to deal with the heat from compression. The second will be based solely on EGTs now that I have the EGT gauge installed and working. I’m not 100% sure that using this approach will deal with the boost lag, but I’m sure that I dial in a little extra at low RPM on the second circuit to help with that.
I've already sent an email to Snow Performance regarding individual nozzle sizes. Right now I’m thinking a single 100ml-175ml nozzle for the pre-turbo circuit and twin 100ml nozzles for post-turbo. That should put me a total of 300ml-375ml total injection, which according to their chart is what I’ll need for 250hp at 25+psi boost. We shall see what they say before I order any nozzles. Of course this means I’ll have to remove the intake manifold I just welded up so that I can add a couple threaded bungs for the nozzles, but oh well.