RB20DET blow thu SAFC2 settings?

[RXXXII]

Hey guys I'm currently running the stock RB20DET maf and was going to change to a Z32 maf for future upgrades, but at the moment I'm running the stock draw though setup.

I know if I just change over to the Z32 maf in the current setup, all I have to do to compensate for the change is change my in and out settings on my SAFC2 from 4in 4out to 2in 4out.

That is simple enough, but I want to change to a blow through setup so that I get more accurate readings. not to mention venting a bov like my old 50mm tial will never be a problem at that point.

My question though is what do I need to change on the SAFC2 to compensate for a blow thru setup? because I know the flow of air is the same as a draw thru setup, but the volume of air should be different and I dont know how to change that.

Any help would be appreciated. I don't really want to have to pay a 500 fee for dyno tuning from an experienced tuner just to switch my system over to blow thru. I'm still stock RB20DET and an SAFC is super limited so I wouldnt gain much from a tune, BUT if it has to be done because Its the only way then... I guess I'll be saving... LOL!

[Seishuku]

Volume of air in, is equal to the volume going out... Just under pressure. You shouldn't need to change anything.

[RXXXII]

Volume of air in, is equal to the volume going out... Just under pressure. You shouldn't need to change anything.

Is this a confirmed statement, or are you assuming? not trying to sound like an a**, just don't want to blow my only DD...

[Seishuku]

It's physics... lol
But I ran my SR blow-through for years, didn't need to adjust for anything.

If anything, it may run a little richer, but the SAFC isn't playing you any favors though, I'd be more worried about that blowing the motor than running a blow-through.

[RXXXII]

It's physics... lol
But I ran my SR blow-through for years, didn't need to adjust for anything.

If anything, it may run a little richer, but the SAFC isn't playing you any favors though, I'd be more worried about that blowing the motor than running a blow-through.

why I'm not compensating any fuel ratios at all... just using it to piggy back ecu to tell my ecu i'm using a z32 maf and venting bov.

I've just heard that because the flow is more restricted in the hard piping that the voltage reading from the maf are slightly higher. Ex. a usual 4v reading being 4.9v... I know in a stand alone setup i could change the maf voltage table readings to compensate, but I'm not sure that the safc2 is capable of that. but i see so many blow thru setups with only an safc tune.

[Seishuku]

The MAFS senses the actual air density, or molecules per gram in the air charge, it doesn't care if it's under pressure or not.
Like I said, it's 1=1... The sensor doesn't care.

I don't like SAFC, I don't really care if you're just using it to run a different MAFS, it's just not a good idea. Just IMO.

[RXXXII]

The MAFS senses the actual air density, or molecules per gram in the air charge, it doesn't care if it's under pressure or not.
Like I said, it's 1=1... The sensor doesn't care.

I don't like SAFC, I don't really care if you're just using it to run a different MAFS, it's just not a good idea. Just IMO.

previous safc problems?

[Seishuku]

No, just not a fan of devices that lie to the ECU to get things done.
All they do is modify the MAFS voltage that the ECU see, and while it does change the fueling to correct for whatever, it's also screwing with your timing in a bad way too.

Just not a good idea.