RB20/RB25 AFM max power?

[Remix-]

What power levels do RB20/RB25 AFM's max out at?

[benm]

I'd be interested to know also...

[GunMetalR33]

Its not so much the power but the amount of Air that it can measure. For example a HKS GT-RS will make a certain power level at 14 psi and a standard turbo will make a bit less power. What I am trying to say is that I think the rb25 AFM will max out at about 14 psi. Now depending on what turbo you have your power levels at 14 psi could be anything from 180rwkw upwards.

If your rb25 has a stock turb then the stock AFM should see you to about 200 rwkw...

hope that makes sence

[benm]

Is their a way of checking if the stock AFM is maxing out? without using an aftermarket ECU?

[2BNVS]

i had to change my rb25 afm when i hit just under 200rwkw

ben...

[Remix-]

Ugh, trying to think of cheaper AFM solutions for the GTR. Looks like z32's it will have to be.

[DRFTR33]

my airflow meter maxed out at 12psi and i was making just over 200kw

there are alot of things that you have to take into acount

you have to remember that hot wire air flow meters work by heating the little wire in side, when air passes over it, it changes the resistance in the wire so it takes more voltage to heat it and thats the signal that is send back to the ecu. once the voltage reaches 5.13 volts it cant heat the wire anymore and that is when you are maxed out

air density(temperature) plays a big part in this as colder air will cool the wire easyer

that i why mine maxed out at around 12psi and some of you guys can run up to 14 psi without a problem

i hope this has helped you

[2BNVS]

yer mine was the same it maxed out at 12psi

ben...

[Memph]

what symptoms would you have if your air flow meter was being "maxed out"

like if you didnt have an FC with commander telling you exactly whats going on. how could you tell?

Cheers

[7heavn]

I changed to rb20/25 afm's on my GTR becuase the std ones ran out of head room. I'm running 2530's at 1.2bar with rb25 afm's(same as rb20) and I more headroom then I need . Much cheaper option then z32's and the rb ones just plug straight in .

[DRFTR33]

what symptoms would you have if your air flow meter was being "maxed out"

like if you didnt have an FC with commander telling you exactly whats going on. how could you tell?

Cheers

if your running a standard ecu it feels just like your boost cut and if you havnt hit that yet, it feels like your going to be thrown though your front windscreen, its a very sudden jolt. thats the best way i can explain it

[RedDrifter]

Those boost cuts can be vilent!!

[Cake]

I changed to rb20/25 afm's on my GTR becuase the std ones ran out of head room. I'm running 2530's at 1.2bar with rb25 afm's(same as rb20) and I more headroom then I need . Much cheaper option then z32's and the rb ones just plug straight in .

that's what he want's to hear

to others he's talkin twin rb20/rb25 afm's on a gtr

[loz]

so your saying that if 1 rb20 afm maxes out at 200kw shouldnt mean if you are running 2 about they max out at 400kw

[pnblight]

i know two rb20/25 afms are good for about 400kw on gtr (two afms) or 540rwhpso would think one about 200kw

[RedDrifter]

RB20 AFM ------> Approx 310PS@wheels

Z32 AFM ------> Approx 490PS@wheels

Not sure about the conversion from ps to KWS though.

[paulr33]

This is from Sydneykid

Rule of thumb for Air Flow meters RWKW & Engine BHP

------ ---- OD ---- RWKW ---- RWKW ---- BHP ------ BHP

No of AFM's ---- ------- 1 -------- 2 -------- 1 -------- 2

RB26 ------ 65 ------ 149 ------ 299 ------ 271 ------ 474

RB20/25 --- 80 ------ 226 ------ 453 ------ 376 ------ 683

Z32 ------- 80 ------ 255 ------ 511 ------ 415 ------ 763

Q45 ------- 90 ------ 302 ------ 605 ------ 479 ------ 890

[GunMetalR33]

Your Engine warning light will also flash in a particular sequence when your AFM maxes out. This is often mistaken for knock... I am not sure what the 2 different sequences for knock and AFM Max out are though...

Is their a way of checking if the stock AFM is maxing out? without using an aftermarket ECU?

[Beer Baron]

Is their a way of checking if the stock AFM is maxing out? without using an aftermarket ECU?

Sure can mate. if you have the car on the dyno the output voltage can be checked using a multimeter. anything over 5volts and the AFM is near max. infact with a pin out diagram you may be able to check what voltage the AFM is sending to the ecu (thus not needing to check it in the engine bay), this way you could check it on the street/strip instead of having to use a dyno.

[jnr_chin]

what will a q45 afm do for the rb20det i know it aint like the z32 but has anyone tried it?