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Re: fueling test results 2.5barfpr s & amm mod (long) Posted by Kevin K [Email]  (#374) [Profile/Gallery]
(more from Kevin K) on Wed, 27 Mar 2002 21:23:46
In Reply to: fueling test results 2.5barfpr s & amm mod (long), jak  [Profile/Gallery]
, Wed, 27 Mar 2002 18:31:37
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nice to get some test results ... well done. but must be careful on o2 output ... can be misleading when mix gets way off.
I know brad likes the resistor trick, but it's hard to imagine any wide range impact when you add a resistor to an op-amp output off amm bridge. A voltage divider (ARC1) is more logical (mabe a EE guy could suggest the right parallel resistor stack to drop output 20%, and not degrade response time).
Interesting 'brad resistor trick' test: check amm voltage to the ecu, and/or inj duty cycle, at a sustainable boost like 10 psi and a steady modest rpm, say 3500 rpm in 4th, done by braking for 5 sec'c or so. This done with resistor, then right after with resistor taken out, or shunted/bypassed with a cabin switch. This would show impact at mid power with resistor trick. Most dyno runs I've seen suggest amm is still controlling at that rpm/boost.
For staying with just 4 inj's and stock no-chip-out-there US LH ecu, moderate injectors (like 26#), and highrate rrfpr with simple trimable gain ( both bell and vortech do this ) and rpm interface ( none do this ) should do well.
posted by 67.208.188...
, Wed, 27 Mar 2002 18:31:37, Wed, 27 Mar 2002 21:23:46 <-- Viewing This Message, Thu, 28 Mar 2002 18:56:02
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