The 1G AFM from memory is somewhat similar, 5V closed and 0V open. I vaguely think they're that way around, but it has been ages.
as a general rule map sensors put out 0-5v, what kind of signal does an afm send?
Must.... avoid.... urge... to... upgrade... parts I haven't.... used.... yet.....
The 1G AFM from memory is somewhat similar, 5V closed and 0V open. I vaguely think they're that way around, but it has been ages.
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Some of them are the same, some have a variable frequency output.
(they are not equivalent in terms of load sensing)
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which AFM? flap type? hot wire type? cold wire type? vortex type?
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In case you are wondering.... no you cannot use an AFM instead of a MAP sensor, or vis-versa without changing the ECU.
IIRC Karman-Vortex are variable-freq, the rest are linear.
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Projects: Celica GT4 ST185 (5S-GTE), Celica RA28 Celica (1UZ-FE)
Previous: Corona RT104, Starlet GT Turbo
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neither is a gen 1/2 3SGTE AFM - resistance is not linear across opening of flap - mapped out it looks more like a saw-tooth.
Daily: Toyota '05 Rav4 Sport
Projects: Celica GT4 ST185 (5S-GTE), Celica RA28 Celica (1UZ-FE)
Previous: Corona RT104, Starlet GT Turbo
Classic Celica Club of South Australia
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There is no substitute for PUBIC inches
Never late in an x8
...so instead of a midget hiding in the engine bay pouring petrol down a noisy hole (aka a carbi), you have a similar-sized man hiding in the engine bay with a bbq gas tank spraying vapour down the same hole
na no midgets lol, got a BFO holley 650DP (34mm primaries and 50mm secondaries) for now and a set of triple 40mm dellorto's for after its run-in the "midget" will be dumping fuel in with a bucket LOL
the gas was actually awesome on it, had a big 425 mixer and AFM delete, lost no power going from petrol to bbq gas. and the consumption dropped from 18-20lt/100 petrol to around 14 on gas
There is no substitute for PUBIC inches
Never late in an x8
I have played with a few different sensors and hooked them up in series with a garden blower set on vacuum. I will dig up the results and post them up.
I had a 7MGE VAF in series with a nissan hotwire MAF of an r33 turbo and a GM hotwire MAF. The only one that had a frequency output was the GM.
Would be interested in see these results
EDIT:
The 1G AFM has two parts
a) Digital portion which indicate if the plate/flap is fully closed (used to interlock fuel pump & not wired back to ECU) in this case the circuit is open, otherwise the circuit is closed
B) is the linear operation which indicated the actual plate/flap position and it ranges form 0-6V (when connected to the ECU) there are also some other resistor in the AFM for temp compensation.
Last edited by auto351; 23-01-2010 at 09:38 PM.
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