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Hello

My plan is to make device which increase my car fuel injection (adjustable 0-40%), so then i can use E85 fuel.Basic idea is that, MCU (16f887) follows my car ECU injector signal and adds 0-40% to pulse width.

Specs:
- one input from ECU and one output to the FET which drive injectors
- input signal bandwidth about 5-400Hz ( depends engine rpm)
- add 0-40% to orginal pulse width (adjustable)

I dont know where to start, so if some body could help me with this.

Hi
From your post the best suggestion i can make is to goggle megasquirt and have a good read. as just adding more fuel to an engine will in the long run only waste fuel and in all probability run worse than it does already.

Regards
Dazz

dazz wrote:Hi
From your post the best suggestion i can make is to goggle megasquirt and have a good read. as just adding more fuel to an engine will in the long run only waste fuel and in all probability run worse than it does already.

Regards
Dazz

No need megasquirt for this. There are products that work the same way as I said, in the first post. I have done research for this and i know it will work. I can now drive 50/50 mixture without problems(only little power loss and cold start is longer) , but i like to have 100% E85.

hi,

Firstly i agree with Dazz, and would recommend also a good session on the rollers

if you still want to go ahead you could look at

http://www.ti.com/product/sn74lvc1g123

or you could use a 555

Steve

Hi

I tougth it's easier to do this with MCU. I found interesting site (http://www.esstronic.com/eprojects/ethanol/index.htm) and there is just what i'm looking for.
So maybe i try some of those circuits and see what happens.