I'm in the process of building a MAP limiter circuit that limits the MAP signal to 2.88 volts. In other words it would eliminate the need for check valves, missing link etc. The same circuit would also be able to scale down the MAP signal so that you could use 450cc injectors with the stock ECU map, ie do the same thing as the VAFC hack without the VAFC. The circuit is based on op amps and is driven by the 5V reference the ECU provides for the MAP sensor. It is about the size of a large stamp. Would there be any interest in buying them for $20 preassembled? I'd be willing to post the circuit diagram once I get it tested and it's not real complicated but for those who aren't electrically inclined this would be a splice and go affair.

 

Aside from the MAP limiting, it sounds like the HKS AFR deally. All it has is a single **** with adjustments of -3, -2....+2, +3 on it. I'm relatively sure it was a potentiometer changing the loopback gain of a common op-amp circuit. Is this what you had in mind....or something more fancy.

I'd be intrested in seeing the schematic when you get a chance to post it.

 

looks like someone read:
https://honda-tech.com/zerothread?id=190336

I'm also going to use something similar. I think it'll use those one things...resistors...

 

but, seriously...I think you might actually be able to avoid anything complicated by the use of two resistors and even a 2.8v zener diode, for good measure.
http://www.autospeed.com/A_0008/page1.html

I've posted this link a number of times, but no one seems to embrace it, heh.

 

I'd be interested if it worked properly with 450cc injectors.

 

i would want it just for a map limiter but nothing else

 

I have heard that Zener diodes "creep" up on the voltage, they have a little resistance before actually getting there.

I would be very interested in (esspecially in the diagrams of) the circuit.

-Dustin