Water/Meth Failsafe and Superchargers?
 

First and foremost, I do understand that not everyone is a fan of WMI but I tend to think that with the help of a good tuner, the system should be beneficial. Also, for some of us who don't have economical access to E85, there really isn't much else.


Anyway, from what I understand, if there is a WMI pump failure, a leak, or any other type of failure that impedes or stops WMI during driving, a WMI failsafe system will automatically revert to a lower boost setting where the tune will handle the lower octane in the absence of WMI.


Would this actually be possible in a supercharged setup since boost is based on pulley size? For instance, If a JRSC is tuned on WMI with the standard pulley size (which is 9 or 10 psi, I believe?) and there is a WMI failure, are we looking at engine failure most likely since boost cannot be adjusted lower?


Or would it be possible, in the event of WMI failure, that the tune can immediately switch to lower parameters on the lower octane and save the engine despite boost still being at the standard pulley size?


I know this should be discussed with a tuner but just wanted to check with the knowledgeable memebers here perhaps from direct or indirect experience?


Thank you :party0030:

You can't run a lower boost but you could certainly switch maps based on a WM trigger.

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You will get the car tuned without the WMI to get a safe base map, and then you will get another map for the WMI, when a failsafe is triggered it will automatically switch to the safe base map, typically less timing and more fuel, when a failsafe is no longer triggered it will automatically switch back to the WMI map.

For added safety, make sure the tank and pump are mounted lower then the injection site, add a filter in between the pump and tank, add a electronic solenoids as close to the injection site as possible (although i had to move mine out of the engine bay as the noise of it opening caused false knock) and after the failsafe and make sure the injection nozzle has a check valve.

Ok, got it...for the most part, I think :bellyroll::slap:

I would imagine a WMI failure would most likely be a big problem with a high boost pulley where at least 93 is required as per JR.

if you didn't have a failsafe to automatically switch maps, yes. But you can de-tune any pulley to realistically make it pretty safe, you just wont be making close to the power potential it could be making.

You could be running say 11.8 AFR with 17 degrees of timing on 12psi with 91+WMI, and without WMI when failsafe is triggered just on 91 run 11.2AFR with 13 degrees of timing on the same 12psi. both will be pretty much the same level of safety. but it'll be a solid 20+ whp less on the later.