Mechanical FI for offroad use?
Thread Starter
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Posting Guru
Joined: Jan 2003
Posts: 1,162
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From: House Springs, MO
Mechanical FI for offroad use?
I do trails and mud bogs mostly and was just curious. Everyone says all the rage for off-camber operation, EFI is the best. I have no doubt of this. I know that the go-fast crowd is big on MFI, but was trying to think of the downsides of MFI for off-road use also. No floats to worry about; all you have is a metering block, a butterfly to control ait intake, a fuel pump, and 1 or many injectors. Idle may possibly be an issue, but aside from that, I can't think of any other downsides. Any thoughts?
Senior User
Joined: Nov 2003
Posts: 348
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From: Indiana
IMHO, just a giant step backwards. It works ok for WOT, but how are you going to tune it for partial throttle operation? Yeah, I know about the Bosch CIS system, and it was a real PITA.
Aftermarket computer controls are the way to go.
Just my $0.023333333333333
Aftermarket computer controls are the way to go.
Just my $0.023333333333333
Elder User
Joined: Feb 2003
Posts: 760
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From: Boise, ID
Mechanical fuel injecton is not your friend. It's a PITA to tune and you'll most likely be chasing the tune up every time you make an altitude change. Unless you have previous personal experience with mechanical injection, I'd stay away from it.
If you want fuel injection, go with electronic of some sort.
If you want fuel injection, go with electronic of some sort.
Thread Starter
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Posting Guru
Joined: Jan 2003
Posts: 1,162
Likes: 1
From: House Springs, MO
Mechanical fuel injection, like Enderle or Hilborn, where you have a belt-driven fuel pump, one or several butterfly's to meter air, and a metering block that varies fuel in direct proportion to the open-ness of the butterfly, and one or several injectors. Since there is no electronic interaction, the only problem would be in getting the correct injectors and idle/startup conditions. I spoke with a friend of mine, and he mentioned Enderle and said that there is no delay between pedal-push and GO!, but they can be something of a pain to get just right.
