What Is A Good Afm?

[yy9888]

the safc can help you run twin afms on a single afm ecu

but a single q45 shouldnt be maxing at 280rwkw

when you say its maxing what is the problem you are seeing?

how are you deterimining that it's maxing?

have you tried cleaning it ?

the out put of the AFM is reaching 5.1volts. the AFM is not durty because "2rismo" is having the same problem.

[paulr33]

there could be other reasons its maxing out, we just don't know what they are.

yours is a s1 R33 ? same as 2rismo's?

maybe its something with the wiring ?

in the S2 skyline we have to pair up the ground signal

as the loom only has ground, signal and power.

maybe its something to do with that ?

[T04GTR]

autronic ftw

[Guilt-Toy]

autronic smalltronic yeah you gotta respect them ... but we aint running autronics so go jump

I got a q45 in mine and i did a dyno run of 296rwkw and was on load value 17 on 20psi so i only had 3 to go myself.. but that 3 should give me another 50rwkw ???

correct me if i am wrong...

even now running 15psi its on the same value or close to it....

[paulr33]

dont confuse the load point placing with maxing the afm

the load points can be rescaled infintely around the afm load

ie: i can make my pFC hit load point 18 on 1.5v of AFM load if i want

or i can make my PFC hit load point 20 on 4.9v of AFM load if i want

just because it hits the bottom row doesnt mean its hitting 5v

[2rismo]

Both my -60 and -61 part numbered Q45's are maxing out at almost the same level. The -60 at 15psi on the GT35 and the -61 at 19psi. I'm seeing the AFM voltage max out on both the hand controller as well as the tuning software which logs it at 5.1+ volts.

It's not a dirty AFM and everything I've checked suggests that it's wired correctly. I'm beginning to think it's something in the wiring however i'm stunned that i haven't seen this issue mentioned elsewhere in 6-odd years of Skyline fan-dom.

It has me farked.

[paulr33]

got some data logs i can see?

am curious what the loading looks like from it (as revs increase etc)

send em through if you can;

paulr33 @ hotmail.com

also what model PFC are you using?

rb25/rb26/ap eng? what version?

[R31Nismoid]

I am also a stunned man.... not that it helps the situation

Failing the issue being fixed, you can tune past if the AFM has maxed out if you wanted too

Spoolup's results i think will be a key factor in the level of "stun" im expiriencing!

Are you guys both using the same tuner?

Just trying to look for some common ground other than the AFM iteself

[paulr33]

have you just matched the wiring 1 for 1 on the loom and AFM?

that is

ground -> ground

signal ground -> signal ground

signal -> signal

power -> power

?

[2rismo]

The car is wired exactly as per the diagram on your website, Paul. I'll try and get the logs sent to me and I'll forward them on to you. It's a boring, ordinary RB25DET PFC. Can get the version number if necessary but it's literally feet away in the shed and I'm on my 5th Corona :|

[paulr33]

thats cool, dont stress

just curious why its maxing

[TurboX]

You may not agree on my lateral thinking but I have proved that by increasing the area/dia of the pipe will give more flow potential to the AFM. (Std RB20)

I just cut the circular part off and drilled a hole the size of the probe and inserted it thru and glued the box part to the outside of the larger pipeing.

Allowed me to run 550cc injectors on standard tune and drive to dyno for triming.

More info here on AFM Upgrade

[r33_racer]

Our tuner has told us our q45 is maxing out at 370rwkws. Our r33 is s2. I used pauls diagram to wire it up.