9 replies to this topic

[screech]

im putting a lambda sensor in my exhaust, and iv got a spare 52mm hole in my dash so i want to put a gauge for it in there, im using smiths gauges, but cant find one made my them,

do they do these?

cheers

mark

[NunoGT]

They do a VAC gauge that does that by connecting to the intake manifold.

Like this one:

[pikey7]

A vacuum gauge does not tell you your fuel mixture!

Then again, neither does a cheap AFR gauge! Wide band is the only one that's "useful". A narrow gauge one is just an indicator. I've never seen a smiths one of either.

[kada1980]

Theres no reason why you can't rebuild a old smiths gauge with the internals of a new one. Someone on here has done it before can't remember his user name.

[Dan]

No Smiths don't make a lambda gauge. DK Lawson is the master of re-casing gauges. Incidentally you can't actually measure the mixture with a lambda sensor, you can only measure the amount of unused oxygen in the exhaust. Most of the guages that read this are set up to say that the stochiometric ratio represents best mixture but unless you have a cat that's not really true.

Edited by Dan, 19 March 2006 - 11:02 PM.

[NunoGT]

A Vacuum gauges provides information that can aid in extending fuel mileage and engine efficiency by giving the driver an idea of his/her throttle position. High vac readings infer low throttle use and high efficiency, while readings closer to zero indicate high load, wide open throttle use.

By a correct reading of this gauge you can setup your air/fuel ratio in a better ie more efficient way.

[Dan]

I prefer my right ankle to tell me where my throttle is. A vacuum gauge tells you how much load the engine is experiencing really rather than throttle position.

[Sprocket]

Vac gauges and short band AFR gauges are bling factor that impress the passenger.

"Oooh, whats that guage for??"


Although short band AFR do indicate severe fueling issues

[AlexM]

Vac gauges and short band AFR gauges are bling factor that impress the passenger.

"Oooh, whats that guage for??"


Although short band AFR do indicate severe fueling issues

Yeh, very true, everyone who gets in my mini always asks what it does. I believe Dan is right when he says it is how much load rarther than throttle position.

I never realsied that smiths ever made a vacuum gauge! Mine is a speedograph one that was fitted to a 1965 Sunbeam Alpine, my Smiths ammeter and voltmeter also came from the same car. Held on temporarily while I save up for a wooden dash

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[NunoGT]

Like I said, it gives you an "idea" of throttle position.

I agree that it´s not the most important gauge to have like an oil pressure or tacho.

For all it's worth, I like it and it has helped me more than once in engine tuning and air leaks.