I was reading some posts on the net about water/methanol injection (WMI). Many have tried pre-intercooler WMI and it didn't help too much. I have read Dustin Whipple has experimented with WMI and he would be able to educate us much better that I. The consensus is the best place to inject is post intercooler, or don't bother.
WMI works and allow you to run more boost and more timing than without WMI. However the intake manifold will have to be removed and injectors added. Given the layout of the manifold I doubt that one injector could give an even distribution of water to every cylinder. So multiple injectors should be used. This guy used 4 injectors, 8 would even be better. Now the downside of multiple injectors is that you don't know if they are all flowing evenly. If just one of the injectors plug up, or fail, one or more pistons will most likely detonate and you will lose the engine! You are unlikely to hear detonation of a single piston, so won't know until it is too late. On a single injector WMI system failure are more likely to be detected before damage. Usually the WMI controller will detect a lack of fluid or flow. Even if that failed a good tune would detect that the intake air temperature are high and it would back timing out. These safe guards are less likely to work as you add more injectors. So to minimize, but not eliminate failure, a multiple injector system should be tested and maintained on a regular basis, requiring removal of the blower, intercooler and intake manifold. How often will depend on how much a damaged engine would bother you.
As Shadowman points out WMI is not a low maintenance item.
Here are link and picture of a post intercooler WMI system on a Ford Mustang Cobra. This guy mounted 4 injectors at the bottom of the intake manifold.
from thread
http://www.modularfords.com/forums/showthread.php?t=66335&highlight=setup
http://www.modularfords.com/forums/showthread.php?t=71148&highlight=setup
post on a two injector system
http://www.alternativeauto.com/misc/mach1_project_dec-05.html
WMI works and allow you to run more boost and more timing than without WMI. However the intake manifold will have to be removed and injectors added. Given the layout of the manifold I doubt that one injector could give an even distribution of water to every cylinder. So multiple injectors should be used. This guy used 4 injectors, 8 would even be better. Now the downside of multiple injectors is that you don't know if they are all flowing evenly. If just one of the injectors plug up, or fail, one or more pistons will most likely detonate and you will lose the engine! You are unlikely to hear detonation of a single piston, so won't know until it is too late. On a single injector WMI system failure are more likely to be detected before damage. Usually the WMI controller will detect a lack of fluid or flow. Even if that failed a good tune would detect that the intake air temperature are high and it would back timing out. These safe guards are less likely to work as you add more injectors. So to minimize, but not eliminate failure, a multiple injector system should be tested and maintained on a regular basis, requiring removal of the blower, intercooler and intake manifold. How often will depend on how much a damaged engine would bother you.
As Shadowman points out WMI is not a low maintenance item.
Here are link and picture of a post intercooler WMI system on a Ford Mustang Cobra. This guy mounted 4 injectors at the bottom of the intake manifold.
from thread
http://www.modularfords.com/forums/showthread.php?t=66335&highlight=setup
http://www.modularfords.com/forums/showthread.php?t=71148&highlight=setup
post on a two injector system
http://www.alternativeauto.com/misc/mach1_project_dec-05.html
Last edited:
