Water/Methanol Injection and Nitrous Oxide

There are failsafes, failsafes and failsafes...

Old Feb 22, 2017, 09:43 PM
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A failsafe isn't a failsafe unless it detects knock.
Running lean doesn't do any damage, it's the resulting knock that kills it.

As for hobbs switches's bad installation.
You're supposed to put a diode across it for switching an inductive load.

The very same reason that fuel pump relays fail.
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Old Dec 14, 2018, 02:16 PM
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Just my annual check-in to support failsafing during increased power from alcohol boosted charge injection. 12 years and over 100,000 miles of methanol injection on stock block and head (excluding cams,springs).

I agree above, hobbs switches are useless in this application as they fail within a year.

My failsafe system is simple. Itís just a dual redundant 2 pump, 4 nozzle design with tephra 7 mod safety set to zero wastegate solenoid duty cycle during either boosted > 12.99 afr or boosted knock. The afr set point is not due to the value itself, but the conditions achieved during sudden loss of concentrated methanol supply. Have set to 0.5 sec to avoid false alarms during normal lean spike conditions.

Last edited by C6C6CH3vo; Dec 14, 2018 at 02:28 PM.
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