safc question for 5m/6m and the flow of factory afm

[pete05]

Im after some advice on the safc as seen on ebay. im looking to build up a bit of a N/A motor for my cressida, i have a 6mge which im planing to use with the 5mge ecu, i know the ecu will basically cope with 6m size increase but im wondering how restrictive the factory afm would be and if there would be much benefit to fitting the safc?

[joecoolmk2]

Im after some advice on the safc as seen on ebay. im looking to build up a bit of a N/A motor for my cressida, i have a 6mge which im planing to use with the 5mge ecu, i know the ecu will basically cope with 6m size increase but im wondering how restrictive the factory afm would be and if there would be much benefit to fitting the safc?

if you wanna get any power out of it, you'll wanna get rid of the AFM anyhow. some of them fuel controllers allow you to use a bigger AFM, or remove them, but i can't remember which one.

i reckon you'd be better with ITB's and a MAP sensor.

[japlish]

i agree, get rid of the AFM but instead of getting a safc i'd go megasquirt

my 2c.

[CrUZida]

AFM will flow more than the cams, so thats not a worry.
And as soon as you change the cams, you need to change the ecu to get the most benefit.
And with a new ecu, comes the removal of the AFM.

So its a nice cycle really.

[pete05]

ahh its a never ending cycle, thats ok i wasnt sure if the engine could flow more power than the afm, in that case i really cant see why people bother with bigger throttle bodys on afm cars as i would think the factory throttle body would flow more than the afm does this sound correct?
I would love to do ITB but the cost would be to much for the engine i think, not to mention the legality factor on a road registered car

[joecoolmk2]

it all comes down to how much power you would like, and how much you're willing to spend. then you can plot out how you should go about it.

just on a side note, has anybody ever put a 7MGE head on a 5MGE?

[pete05]

to put the 7mge head on you need to change the pistons but other than that as far as i know it will fit.

Does anybody know if it change the compression in the 6m from 9.2 to 9.5 would it actually make much difference?

[VeeP]

the safc wont let u change AFM to a different type . .
for example u cant go from a flap type AFM to a MAP setup just by hooking up a safc - unfortuneatly . . .

would be nice to get rid of those restrictive AFMs though huh

[joecoolmk2]

i think it was a jaycar DFA, or a Greddy Emanage which allow you to use a different AFM.

jaycar is pretty cheap, but you can get ignition harnesses as well for the emanage.

[CrUZida]

in that case i really cant see why people bother with bigger throttle bodys on afm cars as i would think the factory throttle body would flow more than the afm does this sound correct?

Bigger throttle body increases throttle response.

[pete05]

did you ever dyno your 6m, or adjust your afm to suit?

[VeeP]

thats a curiosity about the emanage. . .
as far as i can tell, mine wont let me actually use another AFM, but u can hook up a MAP sensor which will allow you to read past the factory AFM maximum output . . . and hence measure the flow of more air. . .

but u cant change the afm otherwise. . . hmmm

[CrUZida]

did you ever dyno your 6m, or adjust your afm to suit?

Nah, never got around to dynoing unfortunately.
The guy who bought it off me did, and got 100rwhp.
Pretty poor result, but it was through the stock auto, and I never drove it in his car so I don't know if it was running right.
Definitely had more than that when it was in my car, 100rwhp would barely move a Cressida.

As for the AFM, I did adjust it to make it richer (3 clicks from memory), but all it did was chew the fuel. I had the AFR's tested with the AFM in the stock position, and they said it was fine, a little rich if anything.
But this was all before I understood what he was talking about.

[pete05]

thanks for that, over the next couple of weeks im going to dyno the 5mge to get an idea of my AFR's as someone previous has cracked open the meter,I will see what the ratios come back like before it put the 6m in. The biggest thing with the 6m at the moment is trying to decide if i should put the late model pistions in it, i dont know if its worth the extra money.

[CrUZida]

Just use the pistons from your 5M


EDIT: Or is it only a 5M-E?