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Old 03-22-2004, 02:53 PM   #1
ursine
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Question Fuel Management

Who uses it? What kind? Advantages and disadvantages?

I am thinking about beginning my turbo prep by starting with the fuel pump, injectors, and a fuel management system and I just want to know what I am getting into. Can it give me more horsepower?
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Old 03-22-2004, 09:13 PM   #2
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No one uses it?
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Old 03-23-2004, 10:41 AM   #3
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im starting to play with an SAFCII and an ITC, but i am being very cautious because i want to get it tuned properly. For NA im probably not going to see substantial gains, perhaps a little smoother with a little better pull. But you will need some form of fuel upgrade and management to do a safe turbo build.
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Old 03-23-2004, 12:36 PM   #4
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I have a SAFCII that I have started tuning on my own. I am using the blue wire mod for air/fuel info. I really need to get an EGT guage for more accuracy, better yet I need to schedule some time on a dyno to get a good tune done.

It is a great idea to install as much as you can before the main turbo install, it will drastically reduce headache on the big day. If you go emanage or standalone, you can play with timing too and then be able to pick up some decent gains from that.
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Old 03-23-2004, 02:10 PM   #5
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So seeming as though I live in CA and cant pass smog with an aftermarket turbo would it be possible for me to get my car all dialed in with pumps, injectors, and SAFCII and then I can have 3 settings. One for stock or running lean for when I smog, one for running rich for more power at N/A and then one for with the turbo?

I am just trying to set up my car so that I can have the turbo on for the majority of the time and be able to take it off and have my car run normally for when I have to smog it.
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Old 03-23-2004, 08:50 PM   #6
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Doesn't the SAFC and SAFCII not work on MY2000+ 2.5RS because of the MAP instead of the MAF?

Basically what i'm asking is if the SAFCII will work with a 2000 2.5RS?
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Old 03-25-2004, 01:42 PM   #7
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Quote:
Originally posted by D-Speed 2.5
Doesn't the SAFC and SAFCII not work on MY2000+ 2.5RS because of the MAP instead of the MAF?

Basically what i'm asking is if the SAFCII will work with a 2000 2.5RS?
Can anyone answer that?
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Old 03-25-2004, 03:25 PM   #8
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an SAFC or SAFII will work when the ecu is in Open loop.

In closed loop (mostly cruising/ light throttle) the ecu will read from various sensors and adjust the a/f mixture accordingly.

In Open loop the ecu will read from a set table ( i believe it still has the ability to update this table, but not as real time or acurately as the closed loop table). It is here that you can modify the air flow signal to trick the ecu into adding or taking away fuel without the Ecu learning around your changes.

In short, it will work when you want it to work which is when you are driving agressively and in Open loop mode.
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Old 03-25-2004, 03:34 PM   #9
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Supposedly on MAP-based RS's the ECU learns around the SAFC, so you'd have to reset the ECU every now and then.

Also, you can't run an SAFC with a MAP-based RS with turbo. If you're not going with a standalone, you'll have to get a voltage clamp to limit the MAP signal the ECU sees to about ~5Volts. The stock MAP sensor can only handle *supposedly* up to 3psi of positive pressure. When it sees over 3psi, it sends out a signal over 5V and the ECU sees it as an error and goes to limp mode or something.

With the voltage clamp limiting the signal voltage, you can't use the SAFC to modify that same signal.

Anyway, I took care of fuel management way before I installed my turbo. I installed the tec 2 and injectors and was able to tune the car for 91 octane instead of 87.
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Old 03-25-2004, 03:37 PM   #10
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So then you would recommend going with the tec2 instead of the SAFCII?

I am new to these types of mods so any info you guys can give me is greatly appreciated.
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Old 03-25-2004, 05:13 PM   #11
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Well, you have a lot more control with standalone systems than the SAFC. Since it gives you so much freedom on what to do, you can easily mess up your engine also.

Also with turbo, if you go for a piggyback fuel management, you'll need some kind of timing/ignition control and knock sensor. Standalones like the tec and link have these as well. Instead of using separate piggy-backs for each application.


The link, I believe has more users within the RS-T community, so you'll probably get more support out there than the TEC. You can check out the AFI and engine mgmt forums also.
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Old 03-25-2004, 05:30 PM   #12
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Do you have a website or something so that I can read up on the link and how it works and etc.?
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Old 03-26-2004, 04:01 PM   #13
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sorry, don't know of any documents for the link
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Old 03-26-2004, 05:11 PM   #14
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Can I just use a fuel pressure regulator instead or having to get a whole new ecu?
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Old 03-26-2004, 05:37 PM   #15
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You'd have to get a rrfpr (rising rate fuel pressure regulator) or fmu (fuel management unit?).

These units allow enough fuel into the combustion chamber by raising the fuel pressure by X amount for each psi of boost.

Just make sure you have some kind of timing controller and knock sensor.
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Old 03-26-2004, 05:46 PM   #16
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Check out my other thread which you have posted in:

http://forums.nasioc.com/forums/show...hreadid=528799

Will the Vortech RRFPR work so that I dont have to get a standalone?
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Old 03-26-2004, 06:17 PM   #17
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I'm no real expert on the matter, but lemme just say this, if you're going to turbo your RS, do it right the first time. Either spend the money on a complete standalone and get it tuned right, or spend the money on wise piggyback upgrades that you know exactly how to tune and stuff...otherwise, if you're going piece by piece, the chances for something going wrong are quite large.

(glad I got rid of my turbo cause I didn't want to deal with getting it to run right )
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