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Discussion Starter · #1 ·
At the title says really,

Just wondered if theres a definite answer to how much power the Q45 afm is good for?

I`ve searched and various sources seem to contradict each other. Whos running one and how much power are you running?

Is it possible to reach the 450 - 500bhp mark with one or do you need to go Z32 for that?

Cheers
 

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bla
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wrong c riggan.... :slap: It may be bigger but it aint the best..

The best is a z32......

 

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bla
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VG30 is Z32
VH41 is Q45

As you can see by the graph the z32 allows loads more airflow ;)
 

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this has been discussed before and everybody here assumes Z32 is the way to go
while googlin about i've seen another graph proving Q45 was superior dont remember where though :nutkick:

check this thread from downunder:
http://skylineking.com/fsm/Guide to building an RB30DET.pdf
Z32: 260 kw @ hubs
Q45: 300 KW @ hubs

:doh:
I was under the same impression.

Ive been advised by several tuners that the z32 is easier to tune especially in the low rpm settings. (upto 500bhp)

But the Q45 will flow more top end.:bigthumb:
 

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Source: Apexi Documentation

80m RB25 airflow meter can measure up to approx. 300ps (221kW)
80mm VG30 airflow meter can measure up to approx. 500ps (368kW)
90mm VH41 airflow meter can measure up to approx. 400ps (294kW)
 

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Q45

Hi m8

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


This is from http://paulr33.sauvic.com.au/ Go to documents and you will see one called Forum Discussions Airflow meter vs Power Guide. There some other good info on there as well.


So you can see quite clearly the Q45 support more BHP. In Australia this is the more common upgrade.

Oh and I have 2 for sale :D :D :D they tend to be in better condition than the Z32's or at least the ones I have had.

I have also seen two types of Q45 AFM's up for sale. I have seen them with Yellow labels (The ones I have) and Pink labels but I don't know what they are off.

Kev
 

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tdi power
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i have seen two sizes of q45 on ebay so maybe this is what the label colour means.
 

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Q45

Hi Ian

They are the same size physically I think at 90mm.

But it is the Yellow labelled ones you want not the pink from what i have seen. It is the Yellow ones I have and same as the ones in this Pic.



Kev
 

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bla
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q45s arent better...

Simply because they are for normally aspirated cars. Even though the Q45 can flow more air , the Z32 can provide a better resolution and thus can be mapped more accuratly.
This is the REAL afm specs, lol...
Z32 ~ 550rwhp
Q45 ~ 450rwhp
All you need to do is look at the VQ(v) tables for both the AFMs.
Going to be difficult to see but... Here's the voltage/airflow for them both:

V Z32 Q45
0.00 - 0 0
0.32 - 5 4
0.48 - 5 11
0.64 - 11 20
0.80 - 21 32
0.96 - 35 48
1.12 - 56 67
1.28 - 87 91
1.44 - 125 128
1.60 - 173 174
1.76 - 232 232
1.92 - 304 298
2.08 - 391 367
2.24 - 498 452
2.40 - 626 555
2.56 - 775 674
2.72 - 946 793
2.88 - 1140 929
3.04 - 1356 1082
3.20 - 1599 1249
3.36 - 1872 1446
3.52 - 2171 1664
3.68 - 2500 1909
3.84 - 2862 2172
4.00 - 3263 2472
4.16 - 3707 2799
4.32 - 4190 3150
4.48 - 4719 3542
4.64 - 5291 3956
4.80 - 5910 4401
4.96 - 6577 4878
5.12 - 7294 5387


Basically the voltage on the Q45 AFM is going to be pretty low at idle... All numbers are from a power fc...
Rod.Bell can back this up, i asked him and he said spot on... :D ;)
 

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Q45

Oh well

GtsTtypeM you must be right then...............

As for name dropping I really couldn't give a flying FCUK who you talk to but I think you are missing the point!

The table is a guideline as to what BHP is being produced by the different AFM's which I believe is based on DYNO results not speculation or what resolution one or the other runs at.

FYI
A HKS FCON ECU has better resolution than a PFC but dont mean it will make more BHP on your car does it?

As with all thing's you need to do your own research and come to your own conclusion before spending your money.

I have run both and to be honest didn't really notice a great deal of difference. But I have gone PFC D-Jetro so I can use MAP sensors with a single turbo. What I said in my last post still stands the Q45's I have had tend to be of better condition than the Z32's. Maybe because they are not passed around as much and you can fit a bigger filter to them. :D Pretty sure Nissan would have stuck with the Z32 AFM if it worked better.

Kev
 

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bla
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pmsl....... corse they will be in better condition as there newer than the z32s, unless your lucky like i was and can pick up a nearly brand new one :)... Nope not missing any point, just trying to make a few... And id tend to listen to a guy who can build an r32 gtr with a low 8 sec pass..... No need to get all bitchy... :slap:
 
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