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hotwire or flapper?


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There were hotwire turbos the first year was probably 88, these also used the crankangle distributor. You might run into trouble is you take parts form a fulltime 4wd turbo with an automatic. I'm not sure if the TCU for the 4EAT ties into the ECU, like they do with legacys.

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well, i just pulled an ea82 mpfi out of the junkyard today. its an 85 xt. i got the wiring, the computer, the long block, and the maf sensor. looked like a flapper to me. would this be a good one to turbo? are the older ones the same, turbo, or na? like is this computer just waiting to see boost?

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The hot wire MAF came out in 87.

 

Caleb mine is a hot wire.

 

The 85 was a vane style ie flapper door MAF

 

Arguments Pro Con

Hot wire

Pro -

less restriction to the flow of air

more accurate in all temps

With it you get a crank angle dist. as Craig says, which is more accurate for firing fuel and controls ig. timing.

Quicker responce to air flow changes

 

Con-

not "tuneable"

with it you get the ECU controled over boost fuel cut

bit more fragile than vane

 

Vane style

Pro -

Has a tuneable spring loaded vane, less spring tension = richer mix

Has a over boost switch which can be easily unplugged

 

Con -

Moving mechanical parts

Some restriction to the air flow (has to push the flapper open)

Standard distrib. with vacuum advance diaph.on side.

 

Hope this helps, if I missed anything or errored, please chime in

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Went out and looked at my car, cuz my curiosity was up. I do not have a vac. advance on my dizzy, and my MAF LOOKS like a Hot-Wire type, but it has a plug in the side, adn if you take the plug out, there is a screw behind it that looks like an adjustment screw of some kind. Do I have some weird system??

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