Dual Fuel on the fly(87 and e85) on stock pcm's!
02-21-2013, 01:46 AM
#21
My guess was hobbs switch kicks e85 pump on and grounds injectors on second pcm at the same time. Second e85 pcm is prolly signaling the 80lbers to fire but if they arent grounded yet they dont do **** till 2 psi.
Stock pcm/injectors do all the idle and part throttle driving and also manage the full timing table. Second e85 pcm only controls the second set of injectors would be my guess.
Stock pcm/injectors do all the idle and part throttle driving and also manage the full timing table. Second e85 pcm only controls the second set of injectors would be my guess.
In the original posts he says no having to worry about a meth pump failure so I dont really see the safety factor being that much greater if that is in fact how he is doing it.
Last edited by itsslow98; 02-21-2013 at 01:52 AM.
02-21-2013, 04:52 AM
#24
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I still like the idea of haveing two seperate tanks and just open a valve to use which ever fuel and change the tune. No second set of fuel lines, pcm, injectors, etc...
This is still a very cool idea though. I just like to be very, very simple. lol
This is still a very cool idea though. I just like to be very, very simple. lol
02-21-2013, 06:15 AM
#27
So, I'm guessing both PCM's are firing all the injectors all the time? The only variable is some sort of hobbs switch cycling the different pumps? So, one set of injectors is firing dry all the time? Or, is it more complicated then that? Nice work either way.
Edit: I guess this way wouldn't really allow for different timing tables and such as the tunes would have to be identical minus the fueling...
Paul
Edit: I guess this way wouldn't really allow for different timing tables and such as the tunes would have to be identical minus the fueling...
Paul
It makes sense but your still relying on a single swtich to switch fuels....if that fails then kaboom.
In the original posts he says no having to worry about a meth pump failure so I dont really see the safety factor being that much greater if that is in fact how he is doing it.
In the original posts he says no having to worry about a meth pump failure so I dont really see the safety factor being that much greater if that is in fact how he is doing it.
My guess was hobbs switch kicks e85 pump on and grounds injectors on second pcm at the same time. Second e85 pcm is prolly signaling the 80lbers to fire but if they arent grounded yet they dont do **** till 2 psi.
Stock pcm/injectors do all the idle and part throttle driving and also manage the full timing table. Second e85 pcm only controls the second set of injectors would be my guess.
Stock pcm/injectors do all the idle and part throttle driving and also manage the full timing table. Second e85 pcm only controls the second set of injectors would be my guess.
Just razzin' ya...
02-21-2013, 06:20 AM
#29
I've gave out a lot of info on it, sorry I'm not giving out a wiring schematic, diagrams, and tune. We've got a lot of time/testing in making this work smooth and flawless. To my knowledge nobody has done this before with 2 pcm's and pump and e85.
02-21-2013, 07:22 AM
#33
I'd like to add, the cost to do something like this if say building a 1200-1400rwhp car wouldn't be THAT much more than building a single fuel system from scratch. Great thing is you could leave all the stock tank/pump/lines and just change them for aftermarket rails so wouldn't cost much. Then you have the cost of the intake modification, fuel cell, fuel rails and pcm/wiring really is the only extra cost. Being as you would need 1 set of rails anyway, would need big lines front/rear anyway, aftermarket regulator, etc. In the end the cost isn't that much more and a much better option than trying for big power on meth in my opinion.
obviously, the MAP signal is split. or are you using two map sensors?
very neat setup
02-21-2013, 07:33 AM
#34
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Probably uses j1939 communication wires between the two computers. If the second computer is on the first computers network then it should read all the sensors from it.
