How Difficult to R & R Air Box

[aparke4]

Originally Posted by maytag

If your intake tube/ plenum and TB are all breathing through a smaller-diameter MAF housing (the OEM MAF hsng) you may be disappointed. Have you considered that?

I'm all about the mod, don't misunderstand. But I'm not sure it makes a ton of sense to do what is clearly a PITA mod, just to neck-it-down and let it keep breathing through the OEM MAF Housing.

If you increase the volume on the front end, then neck-it-down at the MAF, you may get some increased velocity over the MAF. But then you dump it back out into a larger-volume space (your larger plenum), you'll find reduced volume AND velocity. And likely some unwanted turbulence as well, right in front of your TB.

just food for thought.

Great point! I was under the assumption the MAF housing matched the 74mm TB/ should be right at 3 inches. Is the stock MAF housing on the air box smaller?

[flmont]

is loosening the air box the best way to remove and replace the injectors,..Iam pulling them for testing.? Thanks

[maytag]

Originally Posted by aparke4

Great point! I was under the assumption the MAF housing matched the 74mm TB/ should be right at 3 inches. Is the stock MAF housing on the air box smaller?

Yes.
I don't remember the actual measurements I took as I was assembling, but the O.D. of the 986 MAF housing is the same size as the I.D. of the larger intake & TB.

So then you're faced with a dilemma: use the 986 MAF anyway, which negates the benefit you've tried to create. Or use the 987 MAF housing, which is what I've done. I'm not yet 100% certain I'm glad I did. This spring I'm going to go get a flash to an '04 anniversary edition, which used the larger MAF housing. I'm hoping that'll cure some things. It definitely runs fat right now, and I'm hoping that cures it.
Otherwise, this gets chalked-up as "modifications for the fun of modifying". Hehe

Sent from my SM-G970U using Tapatalk

[aparke4]

Originally Posted by maytag

Yes.
I don't remember the actual measurements I took as I was assembling, but the O.D. of the 986 MAF housing is the same size as the I.D. of the larger intake & TB.

So then you're faced with a dilemma: use the 986 MAF anyway, which negates the benefit you've tried to create. Or use the 987 MAF housing, which is what I've done. I'm not yet 100% certain I'm glad I did. This spring I'm going to go get a flash to an '04 anniversary edition, which used the larger MAF housing. I'm hoping that'll cure some things. It definitely runs fat right now, and I'm hoping that cures it.
Otherwise, this gets chalked-up as "modifications for the fun of modifying". Hehe

Sent from my SM-G970U using Tapatalk

Yes it does- I need a remap as well... just one more thing to add to the list of fun mods!

Thanks for the info^