Quick Question On Afm

[MJTru]

I was wondering whats the max psi a r32 rb26dett gtr factory twin afm can handle.????

[Blackkers]

Don't you have a haltech ps 2000?

[MJTru]

Yes i do. Lol. But i also have lots of cars. This is for my gts4 that i just brought back from the dead. Im running small 550 injectors and using a power fc. I know to make about 500hp using no dyno, but on my other gtrs im aiming for way more than 500hp. But on this car (gts4) i just was wondering if i need to use z32 afm for 22 psi. Thats my goal. Ive done 25 psi on rb25 wit z32 afm and the motor still going to this day. Just need to know if the twin stock r32 afm will handle 22 psi.

[MJTru]

Just so things are clear

[89CAL]

Max psi? 10000000000

Air FLOW meters measure flow not pressure. They can read 'x' amount of flow. Need to know what turbos are being used

This is why AFM's are usually talked about in terms of how much power they will handle as air flow is pretty much directly proportional to power. The more air you get in the engine, the more power you can achieve etc etc

Edited June 5, 2015 by 89CAL

[MJTru]

Hmm. Yes i agree a 100% small a** holset hx35. This car was put together for just fun. Nothing to serious.

[MJTru]

The motor is freshly built. All stock other than oil mods and acl race bearings, mls head gasket. I did it all with spare parts around the yard. Doesnt mean i just want to just blow it up. Lol. I will tho. Kml. Im sure ill figure it all out tho mate. Worst case is ill just run twin z32. But was wondering as i have like 12 oem afm for gtr's. Oh internal parts are all new. Not old.

[KiwiRS4T]

The motor is freshly built. All stock other than oil mods and acl race bearings, mls head gasket. I did it all with spare parts around the yard. Doesnt mean i just want to just blow it up. Lol. I will tho. Kml. Im sure ill figure it all out tho mate. Worst case is ill just run twin z32. But was wondering as i have like 12 oem afm for gtr's. Oh internal parts are all new. Not old.

Courtesy Paulr33's website:

Rule of thumb for Air Flow meters RWKW (you will note a single RB25 AFM will measure more than a single GTR AFM)

AFM Max Power at 5v Single RB25 AFM 225rwkw

Single Z32 AFM 350rwkw

Single Q45 AFM 300rwkw

Twin RB26 AFMs 300rwkw

Twin RB25 AFMs 450rwkw

Twin Z32 AFMs 511rwkw

Twin Q45 AFMs 600rwkw

[MJTru]

Thanks for that mate. These are in rwkw. Simple conversation. Looks like twin r32 afm will max out but could work, but at there limit. Hmmm. Funny to see that a singal z32 is at 350 figure twin would be at 700 but its at 511 in twin set up. And twin q45 is at 600. Is this wright????

[MJTru]

Im wrong twin rb25 afm and even better would be twin z32 afm would be best.

[STATUS]

twin rb25 is great for resolution.

twin z32 are generally over kill (unless needed) and in many setups you end up using only 1/2 to 3/4 of the scale and lose tune resolution.

i would much rather the AFM scale be @ 90% max than at 50% max

[KiwiRS4T]

If you have a dozen GTR AFMs then a pair of those will do 300rwkw (400hp) which should be enough for your small Holset.

[Missileman]

Is there any difference between RB25DET series 1 and 2 AFM?

[Blackkers]

Is there any difference between RB25DET series 1 and 2 AFM?

Yeah there is actually.

Series one is a 4 pin while series 2 is a 3 pin pink label.

I think Nistune has it listed for an extra 20 HP or so

[MJTru]

I started to look at the flow charts for the holset and a gtx35r. Looks like there will be about 15 to 20 LB/Minute difference from about 22 psi.

Im trying to compare it to my r33 gtr thats running twin z32 afm with gtx3582r turbo.

Damn i wish i had a better turbo laying around.

[Missileman]

.....

Edited June 6, 2015 by Missileman

[Missileman]

Yeah there is actually.

Series one is a 4 pin while series 2 is a 3 pin pink label.

I think Nistune has it listed for an extra 20 HP or so

So the R33GTST S2 has the pink label, and the S1 has the green label, which is also used by the RB20DET and RB25De, just for clarity.