fstrnyou

holy **** *****!!!! why the hell is that K&N A/F guage cost so much? and it ain't even wideband!!!!!

i have a Defi' a/f ratio guage. DO NOT get a Defi' a/f guage, they suck.

DoriftWolf

An EGT will help to tune or provide a warning that something is not right. Basically it helps you to narrow down a problem. If you have timing adjustment and your EGTs run hot... pull timing. Try again... if they're still hot... add fuel.

For what you have right now, a wideband A/F would help the most. An EGT would be another way of checking, since if you run hot, you'd know to add some fuel back. This would be a lot more accurate for tuning purposes than the narrowband A/F.

My recommendation is still to safely tune it on the dyno and then don't play with it until you save up for the right tools for you to do it yourself.

In order of best choice for just Fuel Adjustment (buget wise):
1) Wideband A/F
2) EGT
3) Read voltage off the 02 sensor, but make sure you know the safe values. I don't know them offhand.
4) Narrowband A/F

totallimmortal

OK so i guess the majority here are saying a A/F gauge won't help me? And i thought the EGT reacted to slowly? how would i know what RPM was causing higher (lean) temps? and I'm not talking about something here to tune my car to perfection, i'll leave that to the pros, i just want to see if i can get a little more outta my car for than month after the SAFC intall and before the dyno

fstrnyou

dude, just forget it. you can't TUNE without a WB. just wait a month, it ain't worth the time to try and tune with an EGT and a factory O2. by the time you figure out what IS going on, you'll already be at the dyno doing more tuning. save yourself the trouble and don't drive hard for that month. i know it's hard, but, you're asking the impossible.

totallimmortal

Thank you thats what i was looking for, but why not drive hard? I drive hard now and run low 15s lol, I know what you mean tho. Also how would reading the voltage off the stock O2 do any good it wouldn't hooked up to a good AF. ohh yeah i think i'd still like to put that AF gauge in the car, any other suggestions on gauges I need 3 for a DIN pod that leaves 2 open

Tofuball

A real coolant gauge . . . and vaccum gauge.

The coolant gauge cuz ours are so innacurate they wont warn us of a problem.

A vac gauge so you can see the tendencies of your engine's vac, and if a problem arises there.

Nither costs THAT much.

If you wanna go expensive, get that dual EGT gauge

HAILERS

I don't understand you. It's the AF gaube light show that is punk. The meter has meaning. Stoic is .40vdc. If you see something like .80vdc..thats pig rich. If you see .10 its lean. If you see the meter jumping on either side of .40vdc its *in the loop* and being controlled by the ECU.

But even seeing .80vdc or whatever .....it ain't accurate. Narrow band 02 are only accurate around .4vdc. Anything else is a just in the ballpark figure. Read TRENDS.

I opted for a cheap fifteen buck digital meter from RS for a couple of years. At least it could serve a useful purpose in life.

Oooops. My bias is showing.

HAILERS

But AutoSpeed had an article where they used a homebuilt AF meter and homemade Inteceptor to tune a BMW, after they made an adjustment to the airflow meters vane setting. So the narrow band AF meters can be useful if in trained hands.

fstrnyou

well, a friend of mine has been telling me for quite some time to read the volts from the O2 to get a better reading becasue the Defi' guage isn't accurate at all. The vdc to afr graph is funny, between .85vdc and .15vdc shows stoich on the guage. and to think, when i had the 850's in, the guage showing rich, which means it must have been .95vdc or something.

and the stock coolant temp guage works fine. at least mine does. mine rises when i drive it hard and stays down when i don't, that makes perfect sense to me that it works.

i'm not sure if a dual EGT guage is really usefull because you can't adjust each rotars fuel delivery or timing independantly. just get the single and put it next to your O2.

Wankel7

totallimmortal - So you said you are buying SAFC? Are you buying the SAFCII? If that is the case you can moniter the voltage of the o2 sensor. Or any sensor for that mater.

So, if that is the one you got. Just save your money on buying a blinky light thing. And use your SAFCII

NZConvertible

And that's not a blinkly light thing?

There is no difference in accuracy between a direct voltage reading (whether on a DMM or S-AFC2) and an LED display. They both show exactly the same thing. The only difference is that it's a whole lot easier to read an LED meter at a glance, as opposed to reading numbers.

silverrotor

iTrader: (1)

I have both an EGT and A/F Ratio Guage. With my level of mods and more to come, I am on the verge of buying the FJO Wideband Unit. Both the aformentioned guages served well and whomever - If they know what they are looking for but as always, It's not enough.

RETed

It depends on your ability to tune.
*I* use just an EGT gauge and readings off the narrow-band O2 sensor, and I have no problem tuning Haltechs.
Just ask my customers.
The wide-band does make fuel tuning a little fast, but I don't find them required.
I tune these cars for street use, and yes they do lose 5% of power from not tuning to the edge, but safe is where I like them for street tuning.
If you're tuning race engines and need to run them to the ragged edge for utmost power, then the wide-band is a must.

I just tuned a customer's 20B NA FC, and the AFR's were pretty much dead on up to 6,000RPM.  It wanted a little more fuel at the very top end to finally nail 232hp at the wheel on a 248x DynoJet, but our street tuning was pretty much dead on through an EGT gauge and an Autometer 20LED AFR gauge.

The usefulness of the AFR gauge is highly dependent on the person using it, and what you're trying to accomplish with it.  I use the AFR gauge to tuned highway crusing for lean and for spotting any deadly extreme lean condition under load, and it was will always react faster than the EGT gauge for a sudden lean condition due to inadequate fuel.


-Ted

flamin-roids

I prefer assuming everything is ok over using guages. Nothing more reassuring than thinking you are ok and fixing the problem when it happens with alot of duct tape.

RotaryWeaponSE7EN

iTrader: (6)

Try this:AEM’s Wideband UEGO Controller is also available in a gauge that includes a single-channel analog output with a Bosch O2 sensor in one unit!

http://www.rx7store.net/index.asp?Pa...rodID=814&HS=1

SwooshMan

The AEM wideband is only accurate to 11:1 afr's. PLX's wideband is $329 and they make and sell a unit that takes the output of the wideband and makes the Autometer A/F an accurate gauge for an extra $35. www.plxdevices.com check it out.

inflatablepets

The gauge seems like more of a bling bling issue to me. Get an EGT gauge.