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View Full Version : Changed intake after tune. Affect AFR?


migoreng
23-04-2012, 11:33 AM
My car was tuned with an Apexi AFC Neo a while ago. Back then I had the stock intake + K&N Panel filter.

I've just replaced it with a Prelude Type S intake + same K&N panel filter but whether or not it provides more power or not, I don't know. The Type S intake is noticably louder compared to stock. My butt dyno can not really notice much but maybe there's some improvement in engine responsiveness.

Generally if you install a better intake after at tune, how does that affect the AFR curve?
What if the intake was downgraded after tune? Does the opposite occur?

Adrian @ Toda tuned it for me. According to the dyno chart I'm running about 12.7-12.8 ratio all the way to redline...
Touge Tom
23-04-2012, 11:42 AM
in theory it should lean slightly? due to it allowing more flow. you should be closer to a 13 A/F-R now.
curtis265
23-04-2012, 11:47 AM
in for info.

given that the AFC neo 'adds or subtracts' fuel injection from the ECU's intended injection then it should adapt as well. I don't think it'll become problematic, but it won't run at 100%.
infurNOS
23-04-2012, 05:43 PM
If you add a better intake that actually flows better it may yield a little more power which will yield a leaner a/f. I doubt changing your intake will yield much more power.

If you were tuned at 12.8:1 you are good to go.
trism
23-04-2012, 06:46 PM
Yep, should learn the new flow after a tank of fuel or so.

Overa ll though, its probably not going to change power, just change the power band.
migoreng
25-04-2012, 03:16 PM
Thanks guys. I'll see how it goes for a week or two. After some more WOT, wow the Type S intake is louder after 4500rpm.
My Tanabe catback used to drown out the stock intake sound (removed resonator), now I can hear the intake again :D
na-118
25-04-2012, 08:55 PM
lol are you the guy with a packet of migoreng on the back of your car?
viinnh
25-04-2012, 09:00 PM
^^^^ looool
migoreng
25-04-2012, 09:02 PM
lol are you the guy with a packet of migoreng on the back of your car?

:)

http://i237.photobucket.com/albums/ff47/migoreng1/_NEW_DSLR/April%202012%20PA%20meet/DSC_0034.jpg
na-118
25-04-2012, 09:08 PM
nice exhaust are you sponsored by migoreng?
viinnh
25-04-2012, 09:09 PM
I was wondering bro is it a full packet or its just a bag ?? Because im on a migoreng drought and id like to steal it
migoreng
25-04-2012, 09:16 PM
lol. it's just a packet...no noodles inside.
curtis265
25-04-2012, 09:23 PM
:)

IMG]http://i237.photobucket.com/albums/ff47/migoreng1/_NEW_DSLR/April%202012%20PA%20meet/DSC_0034.jpg[/IMG]

fkinLOL

love it dude