who knows how to read the exact ratio on the autometer a/f gauge?

[S14tat]

i'm wondering what my exact a/f ratio is. i guess i would want to try to keep it at 12.1:1 ratio. but i mean for the autometer gauge. at what ratio does the rich light start to come on? and what is the max rich ratio it reads before the gauge is maxed out? thanks alot guys.

[deezlins]

if you wanna really tell what your a/f ratio is, then use a wideband, some dyno's have widebands you can use when dyno'ing a car. Thats really the best way to tell what it really is.

[S14tat]

well that is a given. but i really don't feel like paying 75 bucks just to see that. so i just want to know what the a/f ratio on the gauge when its hovering over that area at WOT

[Structure240sx]

the autometer gauge should have come with papers on how to install it and about the a/f ratio assigned to the amount of colors and what colors. problem is the factory o2 sensor isnt that accurate. u figure on a NA car on WOT it will be all green but you know rich to NA lean as hell for turbo. a guy on here hugejp (something like that, sorry for messing it up) was running a stock fuel system and thought he was running rich because of the autometer gauge. went to the dyno and was running very lean. i jsut sold my fmu to him. so either go to a dyno or buy a wideband which i will be doing very soon since my uncles sho seems to be too busy to let me use theirs.

[spitz7985]

well that is a given. but i really don't feel like paying 75 bucks just to see that. so i just want to know what the a/f ratio on the gauge when its hovering over that area at WOT

where did you find a wideband o2 for $75?

[Matthew]

Check this outhttp://www.zeitronix.com/questions/O2questions.htmFirst off, your a/f gauge is a waste of money, and instills a false sense of security. It's foolish to trust your motor to a narrowband o2 sensor.Also, you would have been 100x better off buying a simle digital screen that reads the o2 voltage.Return your autometer sensor, and spend the money on something better.

[IvoryJ30t]

Check this outhttp://www.zeitronix.com/questions/O2questions.htmFirst off, your a/f gauge is a waste of money, and instills a false sense of security. It's foolish to trust your motor to a narrowband o2 sensor.Also, you would have been 100x better off buying a simle digital screen that reads the o2 voltage.Return your autometer sensor, and spend the money on something better.

the accuracy of narrowband O2 sensors makes A/F gauges absolutely useless.

waste of money.

anyway, you cannot figure the exact A/F ratio using a narrowband sensor. you can approximate, but you cannot tune using a narrowband sensor.

[Structure240sx]

i didnt mean a wideband for $75. he said a dyno session would be $75 then he could find out his air/fuel ratio

[huguetpj]

The A/F gauge is supposed to be able to tell you if you are lean or rich, no in between and nowhere near an exact ratio as you want to. My experience tells me that you can't even trust it this far. Mine was reading 3-4 lights from full rich under WOT at 4PSI. Then I find out that my A/F are over 13s.

The gauge itself is pretty accurate when it comes to reading volts (0-1V). The problem is the stock O2 sensor. That is why I'm leaving it in waiting to buy a wideband with a narrowband output.

Although, now that I can read and understand what the EGT is telling me (hey this weekend I was able to tune a T60 powered eclipse on the EGT gauge alone using a SAFC II), the A/F gauge seems like a waste of money.

[Structure240sx]

hey pedro did u get the fmu yet?

[huguetpj]

hey pedro did u get the fmu yet?

Nope. USPS says it was delivered Monday, bright and early. So I'll should get it tomorrow or Thursday the latest... it all depends on customs. But don't worry, I'll let ya know.

Already bought the Iridium plugs, waiting on the Nology wires and your FMU. Then I'm going back to the dyno. Luckily I get a couple of runs for $20... it's nice to know the owner.

[spitz7985]

do you recommend an EGT as a decent alternative to a wideband?

[Structure240sx]

prolly the next best thing. not too close of a substitute but way better than the a/f gauge

[IvoryJ30t]

i would take the EGT gauge over the A/F gauge.

but one problem with using an EGT for tuning, is that if you start to detonate, and the ECU pulls the timing back, the EGT's will get real hot. but its not due to a lean condition, its because of the burning mixture entering the exhaust manifold.

[huguetpj]

The EGT will not tell you what is wrong, but it WILL tell you something is wrong.

As structure said, it's not a substitute for the wideband, but much better than the AF gauge, once you learn to read it.

[spitz7985]

so should i just breakdown and buy a wideband for my turbo kit? what do you guys use? i'm going to be rigging up a MAF hack for my s13, so i probly should have one and not rely solely on my calculations and ghetto rigging

[Structure240sx]

i just ordered te innovate kit from ka24de.com i heard its a very good "unit" and it has a great price

[spitz7985]

god damn, $340 ???

[Structure240sx]

god damn? thats a great price. the FJO setup is like $800 i know theres others that cost alot too

[spitz7985]

its still $340. thats a lot of money. o well, if i need it i need it.

[Structure240sx]

turboing a car costs alot if you want it to run good

[Nathan]

turboing a car costs alot if you want it to run good

No truer words have ever been spoken I figured it out recently, my engine has over 30 times the amount of money in it that my car cost

Edit: it should be mentioned my car was INCREDIBLY affordable considering it came with a blown engine

[huguetpj]

No truer words have ever been spoken I figured it out recently, my engine has over 30 times the amount of money in it that my car cost

My numbers are more 1:1 on that, but cars here pay lots of taxes. :pface

Anyway, I will eventually buy the wideband kit, but I'm looking for one with a narrow band output (I believe the ka24de.com one has it) so I can remove my O2 sensor or at least use my AF gauge to monitor the wide band.

It is not necessary but a good investment. If your strapped for cash get the EGT.

[SloS13]

i got the innovate and an EGT. I put my EGT sensor in my downpipe (didnt want to take the chance of it snapping off and getting chewed up by the turbo).

The wideband updated many many times a second. The EGT is kinda sluggish in comparison

[spitz7985]

turboing a car costs alot if you want it to run good

that's not necesarily true. my buddy spent $1000 on his intercooled T3 setup on his del sol, 10psi, runs beautifully. i know of others who have done the same.

[Structure240sx]

man honda turbo parts are soo easy and cheap to find. one guy said u can redril a dsm manifold to fit on a honda. no wonder he spent $1000

[spitz7985]

*shrug*a turbo is a turbo....

the only honda specific parts he used was the manifold and vafc

the way i'm heading right now, i'll be under a grand.

[huguetpj]

the way i'm heading right now, i'll be under a grand.

I once said that... :rolleyes