Wideband O2 sensors

[hammerhead]

I am looking to get a wideband O2 sensor for an AFR meter, but I was wondering how they work. Do you swap the regular sensor for the wideband, or do you put it in as an additional sensor?

Also: I currently have the HKS Fcon fuel computer. I want to get the lexus afm and 550 injectors before I go bigger boost with my HKS EVC. Will I need to reprogram the FCon system? Or ditch the fcon and go for another fuel management?

 

[jimi87-t]

Um......we just had a thread on this like 2 days ago. Do a search, and it should be one of the first on the list.

(it is still on this first page of threads................here is a link http://www.supramania.com/forums/showthread.php?t=14017

 

[7M-GTE]

get maft or maft pro... and as far as I know the wideband is another sensor after the stocker that reads a/f ratios...

 

[hammerhead]

ok, i got the info on the O2 sensor. Thanks. Any more input on the fuel management?

 

[GrimJack]

You need either a different chip for your FCON, or you need to switch to some other fuel management system, like the MAFT pro.

 

[LEGNA]

I also have the hks fcon and was told by hks reps that the fcon is desigh to work with stock parts and that if i upgrade to bigger turbo and even if i got the chip for the 550cc injectors the fcon will not work...( im going with the MAFT-PRO) good luck.

 

[hammerhead]

I ran into this just now:
http://cgi.ebay.com/ebaymotors/APEX...33553QQitemZ8046677743QQrdZ1QQsspagenameZWDVW

Does this guy know what he is saying? So I could get this with the AFM and 550 injectors and i'd be good to go? If any of you would do it, would you keep the FCon or no. If anyone is in the mood to explain, that'd be cool.

 

[hammerhead]

The reason why i was asking if you would keep the fcon is because he is saying it will work with the HKS F-con. So i was just kinda curious what each one's different role would be then.

 

[GrimJack]

I'm starting to get confused.

How about you tell us what your goals are with the car, and then list the equipment you currently have.

At that point, we can make suggestions for the cheapest / best route to the goals you have.

 

[hammerhead]

Sorry if i got confusing. I have a HKS EVC Boost controller that I got on a good deal a while ago. I eventually want to go high boost, but for now I'll just go as high as the CT26 will push. Before I up the boost, i want to upgrade my fuel system with bigger injectors, FPR, and Walbro FP. Now 550cc injectors and Lexus AFM usually go together.

Now this is where I start to get confused. I know the HKS F-con helps with fuel management. But for the lexus afm, the F-con does not work, I need a MAF Translator (i was told in earlier posts). This guy on ebay sells the APEXI Super AFC to control the bigger injectors and AFM upgrade. And he says that the Super AFC works with the F-con system. Damn, i know now everyone is confused. just like me.

Cliff notes: I don't know jack about the differences in the F-con, Super AFC, Maft, maft pro. Stand alone systems, and piggy back systems. In short cliff, i'd like to read more about the different electronic fuel and engine management system.

Sorry guys, still a noob here. please bear with me.

PS, here are my mods:
HKS 3" Downpipe
HKS Dragger Exhaust
HKS PFC FCON Fuel Computer
HKS Air Intake System
HKS SSQ Blow Off Valve
HKS Beaded 1.2mm Head Gasket
Hi-Flow Cat
ARP Head Bolts
3" Custom Exhaust all the way
Ebayer FMIC
Not hooked up yet: HKS ECV III

 

[GrimJack]

Ok. Let me help a bit then.

Piggyback systems are cheap, relatively easy to install, and provide decent upgrades.

Standalones are expensive, ( ~$1800 ) VERY customizable, complex to install, and provide the best possible performance.

That said, none of the devices you list are stand alone systems.

The FCON & Super AFC are essentially the same thing, I wouldn't suggest moving from one to the other.

The Lexus AFM & 550cc injector modification was meant to replace these.

The MAFT & MAFT Pro were later invented to replace the Lexus AFM, and in some cases, the 550cc injectors as well. The MAFT Pro will also replace your electronic boost controller unless I've messed up my facts - which is possible, I haven't stayed up to date on the MAFT Pro like I should have.

To be honest, in your situation, I would likely pull off the FCON, sell it and the boost controller, buy a MAFT pro, MAP sensor for it, 550cc injectors, fuel pump & regulator, and install the works.

That would easily handle your existing turbo, and likely any upgraded unit you purchase later on that is capable of ~500 rwhp.

PS: That guy selling the SAFC on ebay is so full of shit it isn't funny. The usefulness of an SAFC in the situation he is describing is basically nothing - it provides pretty lights in the dash, that's about it.

 

[GrimJack]

PPS: What I posted up above isn't 100% accurate... but I'm trying to make this easy to understand. If something doesn't make sense, or you've heard something slightly different, post that up and I'll expand that section.

 

[hammerhead]

That was some pretty good info the GrimJack, thanks. It's guys the that ebay seller that should be shut down, cuz I just didn't know better, so i believed him.

Now i have been reading as much info as i could find on the MAFT Pro, mainly from fullthrottlespeed.com and fullthrottletech.com, which was not very much. You should change the thread topic to All About the MAFT Pro, then sticky it after it has gather enough info.

After reading the info i could find, I'm left with a couple questions:

wide band controlled Air/Fuel tracking. With the connection of a wide band like an Innovate LC-1.

A bit confusing to me, because I am not sure if this means that the Maft pro can be used as an A/F ratio meter with the right add-ons, or if the maft pro is simply capable of reading data from another wideband a/f meter.

Then with all the wiring harnesses availabe, which ones are mandatory, for example if i wanted to use the maft pro with the speed density, and boost control.

GrimJack, you mentioned that i should just get the maft pro and a map sensor and i'd be good to go. Then I would continue to use the stock AFM? suppose i want to eliminate the AFM, do i need any other accessories then?

Maybe those of you who have successfully set their maft pro on their supra, share what accessories you have, what features you use, etc and how well it performs..

Sorry guys, if you get confused from this post, take it one paragraph at a time.. I know i'm really fishing for info here, but I believe this is info a lot of people could use.

Thanks everyone.

 

[GrimJack]

The MAFT Pro is capable of reading a wideband O2 sensor, and using that to regulate how much fuel is sent to the engine. While a gauge to read the values from the wideband sensor isn't required, it does help.

If you picked up a MAFT Pro and a MAP sensor for it, you would no longer need the current AFM.