mdvaldosta

Ok, sh*t this is gonna be a long post but I feel the need...

First, changing the size of the sampling tube without correcting for it either in the mass air sensor itself or through a tune WILL cause the meter to read improperly and WILL cause a lean condition. Now, with that being said, theirs a few ups and downs.

First, the ECU will be able to correct minor maf inaccuracies at part throttle and other closed loop (where the 02 sensors are used) conditions. But, and a big but - at full throttle the car goes into open loop and with that there will be no corrections. It should be noted that the reason the 73mm tube change (without electronics) is considered OK is because the factory tunes the cars rich - and alittle bit extra unmetered air is going to lean it out for max power. So as long as the maf is only a "little" bigger or you do minor port / post work then your just effectivly leaning the a/f out some.

Doing this sampling tube work will definately help top end power (mostly because of the leaner mixture) but the ECU will try to correct for this in closed loop - which is probably why your having problems idling. It will likely get alittle better after you drive it for a few days but probably won't go away. Just make sure you don't have any other mods that lean you out (most all mods affecting airflow will lean your tune out alittle too).

Personally I wouldn't do it myself, but to each their own.

roundman

GLAD TO HEAR IT, YOU'RE FINALLY BEGINNING TO LISTEN TO ME!!! LOL

Dbeck002

just discovered the problem. called up JDs and they said that because i had my filter bolted straight unto the MAF that turbulence created bad readings. i put the fenderwell elbow back in and now it idles and runs fine.

HOLY SH-T THE POWER INCREASE IS GREAT. HAD A 70MM TB THIS WHOLE TIME WITH STOCK MAF, NOW THAT I OPENED UP MY INTAKE, IT IS GREAT!!!

im finally done with all bolt ons!!!! nothing more for me to do except gears and heads teehee...

mdvaldosta

congrats

Dbeck002

I FEEL LIKE RACING A HONDA CRX NOW....



that would be like standing a lion up against a billy goat...




still fun to watch even though I know the outcome [sm=icon_flaming.gif]

nemethjames1

so when you put the maf in you noticed more pull? i gotta intake and tb and all... still stock maf, was going to wait on it, but if it makes for more pull i might reconsider

nemethjames1

??

Dbeck002

I had a full CAI + TB and stock MAF. so when i put that new 73mm maf on there, HOLY **** DUDE!!! trust me get the bigger maf from JDsperformance.com every gear pulls much harder now. i had a grin on my face this big <----------------------------------->

bobby

DUDE! thats awesoem! i cant wait to get a bigger MAF! i got 70mm tb and CAI but stock MAF. CONGRATS! (p.s. ill be on AIM in a little while so we can talk )

Dbeck002

Koo....