3S-GE setup Factory RICH @ High RPM ?

[abently]

Had the run-around MR2 on the dyno a while ago, just to get a baseline figure more then anything else, I'll have to pull up the Dyno print-out but I've got to ask the Question before getting a SAFC.....

Are the Factory Fuel maps setup Rich @ High RPM from Factory ? Or is there more likely a Fault with the Fuel Pressure Reg, AFM or ECU ?

Going of my memory, the AFRs' were down to about 11:1 towards the end (6000ish Rpm), is that normal ? As there's no point getting a SAFC if there's an actual issue somewhere....

Thanks in advance guys !

[StuC]

yes they are setup hella rich - but having said that check your 02 sensor to see if that is working correctly. If it isnt they will richen up a fair bit.

[roadsailing]

running that rich doesnt surprise me much at all, on a factory turbo car.

IIRC the oxy sensor will have nothing to do with it as the ECU only looks at it in cruise situations (its not fast reacting enough or suitable to make corrections on the fly at WOT)

i'd look at air temp sensor and all the rest, pulling fuel put should give you a fair bit more power

[-GT-]

Welcome to Toyota. Check out the dyno day thread, there'll be a couple of graphs there to make you feel better. Actually, if you find any graph with a factory ecu you'll see the same. Be thankful you don't have a factory turbo engine, i saw a couple of cars last weekend trying to register afr's off the chart for the whole pull...

It's Toyota being toyota, overengineered and overly safe afr's.

If you don't want to go full programmable ecu then a safc is a worthwhile choice.

[thechuckster]

11:1 for NA at high rpms is verging on pointless - a target of 12.5 or 13 would be far more sensible.

If you're going down the path of SAFC and ultimately programmable ECU, get wideband 02 sensor (e.g. TechEdge or Innovate).

[ra23celica]

The TechEdge wideband I have borrowed from a mate (thanks mate) for my 1G-GZE shows 11's to 12's at high rpm's so what you have is factory normal and stock, so don't go chasing problems that don't exist mate!
Cheers.

[abently]

11:1 for NA at high rpms is verging on pointless - a target of 12.5 or 13 would be far more sensible.

If you're going down the path of SAFC and ultimately programmable ECU, get wideband 02 sensor (e.g. TechEdge or Innovate).

Bought mine WB02 about 5 years ago actually...

Only put it on the Dyno to get a base figure and got the AFRs' checked just 'cause it didn't cost any extra or less for the 2mins putting the sensor in the tail-pipe.

Will get the SAFC tomorrow and hopefully should get an nice healthy 10+Kw out of it by the end.

[thechuckster]

The TechEdge wideband I have borrowed from a mate (thanks mate) for my 1G-GZE shows 11's to 12's at high rpm's so what you have is factory normal and stock, so don't go chasing problems that don't exist mate!
Cheers.

yeah - but you'll run uber rich with forced induction to be on the safe side of detonation and avoid melted pistons, with NA you can climb closer to stoich on power.



abently: i don't suppose you're after a spare WB02 board and parts? I bough one of the kits ages ago but never got a sensor to suit so the kit remained unbuilt. i have about 90% of the BoM left (i scavanged a few bits for other MS gear) if interested.

[hamgatan]

since youve mentioned AFM im taking it you have a early 90s gen 2 3SGE..

yes all gen 2 and 3 3SGE's run rich as all hell in the MR2... its annoying me quite a lot at the moment as well, and im going to take the O2 sensor and MAP Sensors out and clean them up just to see if it improves anything at all...

[abently]

since youve mentioned AFM im taking it you have a early 90s gen 2 3SGE..

yes all gen 2 and 3 3SGE's run rich as all hell in the MR2... its annoying me quite a lot at the moment as well, and im going to take the O2 sensor and MAP Sensors out and clean them up just to see if it improves anything at all...

Yes, 2nd Gen, cleaning the O2 Sensor ok, but I don't see how cleaning the MAP sensor will change anything unless you put in a Aftermarket Air-Filter.....?

[abently]

abently: i don't suppose you're after a spare WB02 board and parts? I bough one of the kits ages ago but never got a sensor to suit so the kit remained unbuilt. i have about 90% of the BoM left (i scavanged a few bits for other MS gear) if interested.

Sorry, I actually bought one of the Innovate WBs' after they had just been released onto the market a couple months beforehand....

[abently]

Actually should ask this as well, in Closed Loop mode, what are the Factory target AFRs ?

Are they still rich or are they actually close to 14:1 ?

[ra23celica]

Closed loop uses only the signal from the single wire (narrow band) factory 02 sensor. On my car it will vary from day to day, sometimes cycling from 14.8 to 14.9 and back again, other times from 14.6 to 14.7 and return. Close enough for me.

Chuckster - what exactly do you have left / for sale of a wideband O2 sensor please?