Gauges A/F ratio, Boost, and Fuel pressure - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-16-2008
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Gauges A/F ratio, Boost, and Fuel pressure

I am trying to decide what gauges to purchase. I really like Autometer gauges but open to any suggestions.

I want the gauges to be useful and easy to read.

Would an A/F ratio gauge like this one be sufficient?

Autometer 4375



or do i get this one? I mean the price difference is huge!

Autometer 4378




For Fuel pressure something like this? Honestly I am not sure what to get here.

Autometer 4363

For Boost I was thinking about going with this one..

Auto Meter 4304



I am looking for any suggestions on brand, model, just post the link up, I cant decide on any of this. I cant see spending a ton of money on it.
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Old 10-16-2008
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IMO autometer is good. I have them on the lightning. And for the A/F a wideband is the only way to be accurate. I use innovative products. (LM1 & duct tape was used on the ranger for tuning)

If you use a narrow band it'll only show true a/f at WOT. This is very limited and only helps at WOT... which is only 1% of the time.

Rich
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Old 10-16-2008
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Quote:
Originally Posted by wydopnthrtl View Post
IMO autometer is good. I have them on the lightning. And for the A/F a wideband is the only way to be accurate. I use innovative products. (LM1 & duct tape was used on the ranger for tuning)

If you use a narrow band it'll only show true a/f at WOT. This is very limited and only helps at WOT... which is only 1% of the time.

Rich
I was thinking I read some where that you can tap a wire from the PCM to read a/f ratio, is that narrow band?

So if I need a wide band where do you install that o2 sensor? before or after the cat? is it a new senor all together or do you swap out one of the stockers?
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Old 10-16-2008
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Originally Posted by zabeard View Post
I was thinking I read some where that you can tap a wire from the PCM to read a/f ratio, is that narrow band?

So if I need a wide band where do you install that o2 sensor? before or after the cat? is it a new senor all together or do you swap out one of the stockers?
Yep on a ranger thats only going to be a narrow band. Only a few cars have wideband in stock form. Mostly european high end stuff.

Never have one downstream of a cat. You can do one of two things. You can unscrew the stock drivers side 02 and wire it up out of the spray of water. Then screw in the wideband.
Or you can actually tap the stock 02 wiring into the wideband. That way the PCM gets all it needs and you can have a full time in-cab wideband.
(A lot of mustang guys do it that way)
Others.. weld in an additional bung.

Rich
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Old 10-16-2008
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I can weld in an additional bung, any reason you said the drivers side vs the passenger?

My exhaust is far from stock form I welded in the o2 bungs for the stock sensors too when running my exhaust.

Also while doing some searching I saw you mentioned the Scangauge, it will read wide band? Or is that reading not what I am looking for? I have a scangauge.
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Old 10-16-2008
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The narrow band rich/lean A/F meter like the Autometer 4375 can piggyback off of the signal wire from either of the factory upsteam sensors. The narrow band gives you a vague idea about what's going on (rich, lean or stoichiometric) but you really need the actual A/F numbers from a wideband to calibrate or monitor the open loop mixture.

A wideband uses a more sophisticated sensor and it should be installed upsteam of the cats so you can use it for both closed and open loop. I changed from the 4375 to the wideband 4378 when I installed the supercharger. I had already added the extra bung to the exhaust when I did the V8 swap.

Since the late model Ranger returnless fuel system runs at about 65~70 PSI, I have the same 4363 FP gauge that you referenced above. Instead of boost only, I installed a 4301 vacuum/boost gauge that reads 30 inHg vac to 20 PSI boost.

Good gauges are not cheap but these guys have decent prices on Autometer:
http://egauges.com/
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Old 10-16-2008
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The scanguage only reads the narrow band.

I've done so much side by side comparisons that I'm now comfortable enough to spray w/o the wide band.

Rich
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Old 10-16-2008
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Like Bob said, I would recommend a boost guage that shows both boost and vac instead of just boost like you posted. Because realistically, you are aren't going to be pushing 35psi.

Something like this: http://store.summitracing.com/partde...5&autoview=sku
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Old 10-16-2008
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DEFI makes some great gauges, not cheap but IMO the nicest looking gauges.

http://www.nippon-seiki.co.jp/defish...bf/bf_top.html
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Old 10-16-2008
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thanks for the input guys.

I think I am going to go with these 2 gauges for right now.

Stewart Warner 114219 Fuel pressure gauge

Stewart Warner 114537 Boost/Vacuum Gauge

then save all my pennies for this one

Innovative Technology A/F Ratio Wide band
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