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Old Jan 12, 2008, 09:50 AM   #1
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alcohol/meth injection and rev limiter

I was just wondering what issues there might be in hitting the rev limiter when injecting?

Do you have to worry about a situation where the alcohol is injecting but the fuel injectors are not due to a fuel cut ordered by the ECU? (which would create an extremely lean situation)

For example, if you are running an HFS-1 system with two 1.0 mm jets triggered by a MAP sensor and you hit the rev limiter, the engine would still have quite a bit of "fuel" entering the motor even if the fuel injectors stopped altogether, but not enough to have a safe AFR. Seems like a situation that could throw a rod through the block in a hurry.

If you had a Zeitronix AFR-based failsafe, then it would probably save you, but with just the flow sensor based failsafe, would you be in trouble?

Am I correct in thinking that there is no risk of this with the HFS-5 or 2d system because the fuel cut would automatically cut the alcohol injection as well through the FiA?

Thanks.
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Old Jan 13, 2008, 06:39 AM   #2
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Old Jan 14, 2008, 03:30 PM   #3
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you suppose to tie it to your injectors, the more the injectors are working the more meth you get. So if you hit fuel cut, no more meth.
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