3SFTE A/F Ratio advice Options

[digs]

Hi, can I ask those who have had experience in this what kind of ratios they expect to see runnning their 5sfte or 3sftes?

I have a wideband, which fluctuates around 14.2 to 15.3 at idle, and 13.5 - 15.1/2 ish off boost runs. The AEM wideband gauge does continually fluctuate though, going through various ranges constantly.

I did do boost run to see, and was measuring 12-13s on WOT. Only 2 runs as not sorted det cans yet so not monitoring detonation. No more boost runs till I work on that.

This is using 295cc injectors, stock pressure. I do have 460cc injectors available too, as well as an afpr, and have emanage blue fitted.

What is the expected values and also, should my wideband be CONSTANTLY fluctuating ? As I will have issues with street tuning as it is never on one value for long ? Or do you guys look for a range?

Any experience would be gratefully received and listened to.

This post has been edited by digs: Jul 22, 2013 - 3:27 AM

[delusionz]

I think you should be using the adjustable fuel reg anyways for its rising rate.


I'm not sure how the emanage works, I'm guessing it uses its own map sensor and it works by constantly feeding garbage to the stock ecu with +/- corrections

So if you increase your fuel supply, then take off from emanage you will reduce fuel but increase ignition as you hit a lower loadpoint on the map. Perhaps reduce your distributor advance a bit, in diagnostic mode set 8 deg advance

[Syaoran]

OP: Stop. I gotta say this again but your e-manage will be your limiting factor. Keep adding more and more stuff to the e-manage and you'll be way over what a Megasquirt would cost you. You're going to end up having paid over $400 if you add the internal map, the injector harness and then you're going to want to add the ignition control too and, lo and behold, you're still fighting the OEM ecu running a piggyback.

Lower your boost. Keep the 295cc injectors, and save for a standalone (be it megasquirt or not). You're going to end up blowing your engine soon enough if you don't, like everybody else has.

[digs]

OP: Stop. I gotta say this again but your e-manage will be your limiting factor. Keep adding more and more stuff to the e-manage and you'll be way over what a Megasquirt would cost you. You're going to end up having paid over $400 if you add the internal map, the injector harness and then you're going to want to add the ignition control too and, lo and behold, you're still fighting the OEM ecu running a piggyback.

Lower your boost. Keep the 295cc injectors, and save for a standalone (be it megasquirt or not). You're going to end up blowing your engine soon enough if you don't, like everybody else has.

been reading the megasquirt thread that someone posted actually with interest can drive off boost without issue, and 295s idle and cruise ok, so can do that. However do already have an emanage harness with injector and ignition connections, it's a plug and play harness created by a guy who does them I know, so haven't spent that much on it.

But hearing what your saying, will research standalones. Never let it be said I don't listen to others