stevej88na

I think we all know how common it is for us to tell someone to check their AFM, and we may even go as far as saying, "see FSM page such and such." I'd like us to build a better AFM troubleshooting guide that we can point people towards, and it should eventually be part of an overall idle troubleshooting guide. So I went ahead and started the AFM guide (it's purely FSM data so far) here:

http://howto.globalvicinity.com/gv_w...i=95&co=1&vi=1

But I have some questions already. My impression from various discussions here is that the turbo and non-turbo AFMs are different. According to the FSMs, only the S4 AFMs differ in resistance range, while the S5 AFMs appear identical. Am I missing something, or are the S5 AFMs identical between turbo and n/a? Also, if there are more than resistance differences, like different spring constants, please let me know, or just go ahead and update the reference page yourself!

Props to My5ABaby for posting a lot of great FC info. The project now has 40+ how-tos and reference pages. I had originally envisioned the project as purely modification how-tos, but it's shifting towards something much more useful: a sort of community-maintained (and therefore superior) FSM. Very cool.

Sideways7

iTrader: (7)

From a thread a few weeks ago, it appears that the NA and TII afm's, while having the same resistance ranges, have different stiffness springs. The TII spring is stiffer, so it can accomadate the larger airflow a turbo motor can produce. If you use a turbo AFM on an NA, you will run lean, while a non-turbo afm on a turbo car will cause you to run rich, but have the possibility of maxing out the afm.
I'm going to try to post some stuff to your site soon, but I've been real busy lately. A combination of school , watching my daughter, and trying to get the engine swapped into my car in time for the rotary bbq in a week.

stevej88na

Thanks for the info, most conversations here have stuck to S4 N/A and TII differences - including the different spring constants. My searches haven't come up with anything for S5s, though there must be a difference, because Mazdatrix lists four different part numbers:

86-88
Non-turbo: 13-2100-N326
Turbo: 13-2100-N318

89-92
Non-turbo: 13-210R-N350
Turbo: 13-2100-N370



How old's your daughter? Depending, that could easily be a full time job right there. It's awesome you want to add to the project; it's only as useful as the community wants it to be!

Sideways7

iTrader: (7)

Shes 15 months. Luckily there's grandparents to help out too, especially on the weekends.

Rob500

Besides the spring stiffness, the S5 NA and T2 AFM's have physically different shaped plungers.

Rob

j9fd3s

iTrader: (3)

if it matters the s3 and s5 nont turbo afms are maxed out stock, both close to redline

stevej88na

Not that I doubt you, that's great information and needed in the reference, especially because the FSM shows the exact same internal diagram for n/a and TII. I'll post that info now, but is that from your personal experience?

I'll post that too, it's good info to know.

Thanks for the info guys!

Rob500

As far as the plunger shape goes, I have several AFM's. The T2 plunger has a fatter more round nose - the NA is more pointed.

Rob