[RESOLVED] atmospheric dump [Venting]

[qbmike]

ok when you go from a recir setup to an atmo dump do you HAVE to have an maft or could you use a safc instead and will work the same im confussed some sites say it work without the maft and others say you can just use a safc

 

[snowborder714]

To vent to the atmosphere, you need either a MAF-T setup in blow thru or have a speed density setup. The S-AFC is just to control the air/fuel ratio and has nothing to do with venting or recirculating.

 

[kronus]

To vent to the atmosphere, you need either a MAF-T setup in blow thru or have a speed density setup. The S-AFC is just to control the air/fuel ratio and has nothing to do with venting or recirculating.

Completely correct. Just thought I'd chime in so the OP doesn't ask 'are you sure?'

Search is your friend; there are plenty of threads about this and all of them should point you to the correct answer. Or just read what snowboarder said.

 

[kronus]

Hey, at least you're admitting that you don't know everything. I can appreciate that. Don't worry though, we were all newbs at one point or another.

 

[CompuBob_TSi]

S-AFC's seem to work with venting with every type of MAF other than our stock Karman maf's.. when a Karman maf is selected in the settings, the option for venting disappears from the menu. I forget exactly what it's called.
You think it could trick the computer by giving a false maf reading, but I guess if it can be done, then you would be able to do it. so obviously there is a reason it cant be done.

If you had a MAF-T Setup before the turbo (which can be done, but it's a dumb thing to do) then you will have to use a S-AFC to control it. but if it's after the turbo and bov then it does not care what air is missing, because it hasn't been metered yet. so no extra stuff is required if you set it up that way.

 

[Locke]

If you had a MAF-T Setup before the turbo (which can be done, but it's a dumb thing to do) then you will have to use a S-AFC to control it. but if it's after the turbo and bov then it does not care what air is missing, because it hasn't been metered yet. so no extra stuff is required if you set it up that way.

An S-AFC has nothing to do with a MAF-T. You can run any combination of translator and S-AFC. As stated previously, (1000+ times) the only proper way to vent would be to convert to either a blow-through MAF setup or to a speed-density system.

This subject - in all it's variations - has been beaten to death.

 

[CompuBob_TSi]

An S-AFC has nothing to do with a MAF-T. You can run any combination of translator and S-AFC. As stated previously, (1000+ times) the only proper way to vent would be to convert to either a blow-through MAF setup or to a speed-density system.

This subject - in all it's variations - has been beaten to death.

sorry, I was only stating that if you were to run the MAF-T BEFORE the turbo (which you don't really see but can do) then you would need a way to trick the maf because the air being vented was already accounted for.
But hey, I've never run a MAF-T so I'm just thinking of what it would do hooked up like that. My friend with a MAF-T in his Grand National has it hooked up before the turbo and he needs to recirculate it for it to vent properly. Now if it was after the turbo/bov then he would not have to.

 

[snowborder714]

sorry, I was only stating that if you were to run the MAF-T BEFORE the turbo (which you don't really see but can do) then you would need a way to trick the maf because the air being vented was already accounted for.
But hey, I've never run a MAF-T so I'm just thinking of what it would do hooked up like that. My friend with a MAF-T in his Grand National has it hooked up before the turbo and he needs to recirculate it for it to vent properly. Now if it was after the turbo/bov then he would not have to.

If you were to run a MAF-T setup in draw thru mode (replacing the stock MAS with the GM MAF), you would still have to recirculate. The only plus to doing this is the fact that you have the GM MAF and not the stock MAS. And the S-AFC would still have no effect on this way.

 

[CompuBob_TSi]

If you were to run a MAF-T setup in draw thru mode (replacing the stock MAS with the GM MAF), you would still have to recirculate. The only plus to doing this is the fact that you have the GM MAF and not the stock MAS. And the S-AFC would still have no effect on this way.

well then, Obviously I read the S-AFC manual wrong.. I get it now.