I've heard stories about the ECU relearning its own setting and kinda bypassing an S-afc settings but what about other products? Like the ARC 2. I was reffered to split second products in another thread I started about fuel supply. I was wondering if anyone had contact info for split second or if anyone has work with this.

plus will I still need a voltage clamp for my map sensor seeing as how I'm going turbo in the next few weeks...

I'm just trying to gather up all my info before I'm up a creek without a paddle.

Brad

chances are I'll be getting a voltage clamp and a rrfpr but I wanna be original damn it!!!

nuttin wrong with copying the masses once the masses are not lemmings heading for a cliff ;)

Here's the problem with the MY00-01 cars and piggyback electronics - in order to defeat the fuel cut caused by the MAP going out of range, you have to fool the ECU into thinking there is no out of range condition - i.e., a check valve in the line running to the MAP sensor so that no positive pressure will be seen, or a voltage clamp to make sure voltage never exceeds 4.8v from the MAP sensor.

A device like the SAFC hooks into your sensors and ECU and affects what is seen by the ECU based on your programming. So, you say at x% throttle, and x000 rpm, enrich (or lean) fuel y%. It does this by modifying the MAP sensor voltage.

Problem is, once you hit 4.8v, that's the maximum. So by fooling the ECU, you lose the ability to control it, because the ECU doesn't see what it is supposed to anyway. You can bring the voltage down to lean from 4.8v, you cannot enrich. And, that 4.8v isn't going to be accurate necessarily, especially under boost, because your fuel mixture is also being enriched by the RRFPR.

Basically the only electronic doodads fuelwise that are going to be useful on a MY00-01 are those which have their own MAP sensor which can see the real manifold pressure. That leaves your auxiliary injector controllers (the Aquamist MF2, the SDS EFI, that Greddy thing you were asking about) and your programmable systems (Tec, Haltec, Motec, Link, Wolf).

Thank you blaster 88...

that is exactally what I wanted to hear.. after all this struggle this that kinda pushed me in the right direction. I'm probably going to put in my rc injectors (320 cc) and save the stock ones for when I get a rebic or something. By the way what do you recommend as far as RRFPR again.. did you say 4:1?

thanks once again.

Brad

one last question though.. if you clamp the voltage lower then 4.8 like around 4.5 or 4.6 will it run leaner?

I believe the JCS torque chip II limits the MAP to only 4.5V, which only changes what manifold pressure your auxillary fuel delivery must be active at to not be lean under boost.

On my OBDII scanner I never sees over 34 in hg manifold pressure or 117KPaA - and the ECU limits for the MAP sensor are 35.9 in hg or around 119.7 KPaA. So, above 34 in hg then my stock injectors are done increasing fuel and my SDSEFI.com injectors must be active and taking over above that.

If you are using a RRFPR and the voltage clamp is lower like this, it does mean the injectors wont flow quite as much at 70 psi as they would if the voltage clamp was a little higher. But, JCS is finding the 4:1 Vortech FMU (rrfpr) is perfect with their clamp at 4.5V for their 5-7 psi turbo kits.

Larry

Vortech 4:1 FMU (ask for barb fittings, not AN) and a 1w 5.6v zener will clamp at 4.7x v.

That works.