Q45 Afm Limit

[R34GTFOUR]

Hey everyone,

I've tried a quick search on this subject but there hasnt been much clear cut info that i've found. The z32 is the more common choice, but for the people chasing bigger power again in a single afm setup, wheres the brick wall for the q45.

I've heard that they read more and less than the z32, and some say it can read 500rwkws (which i find hard to beleive) so i'm not sure whats the real deal is. I've also read that the q45 can cause some problems at idle since its so big on a 2.5L, so im abit unsure on this.

So who out there actually has a q45 wired into their car, and how is it like to drive? Have there been any problems? What sort of power are you making on it and importantly at those power levels what was the afm voltage at? Also who has actually maxed the q45 out and what power was it making/boost pushing?

I've personally seen the stock afm run out of puff at the 200rwkw range, and the z32 gives up a bit past 300rwkw's, but the q45 is something i've always wondered about

[R31Nismoid]

Z32 does more than a bit past 300rwkw btw

[GTRsean]

R34 GT-T running a t04Z managed 360rwkw before the z32 maxed out.

[R34GTFOUR]

im not normally a kw person, i would of thought 450rwhp would see a z32 maxing (abliet thats more than 300rwkws, just getting lazy with the conversions)

anyhoo, not really interested in the z32 side of things, just what the q45 is capable of

[Chrispy]

The Q45 AFM will max out way before the Z32 one... Check out www.nicoclub.com they have a whole forum dedicated to the VH45. I've been hanging around there a lot since I'm sticking a turbo VH45 into a Z32...

[VB-]

it can vary, there are ones with large resolution and some without. mate of mine has one of the low ones, tops out just below 5000rpm (GT35R, RB30DET). if you get one of the 'high' reading ones i think its prettys imilar to a Z32, but just stick with the Z32 as its a known thing

[Spoolup]

560 rwhp - Std Q45

Have just removed the internals of the Q45 and fitted it to a 4 inch intake - aiming for 600 rwhp with this set up

Edited August 2, 2008 by Spoolup

[R34GTFOUR]

it can vary, there are ones with large resolution and some without. mate of mine has one of the low ones, tops out just below 5000rpm (GT35R, RB30DET). if you get one of the 'high' reading ones i think its prettys imilar to a Z32, but just stick with the Z32 as its a known thing

is there a way to see which q45 is high or low resolution without plugging it in?

[R34GTFOUR]

560 rwhp - Std Q45

Have just removed the internals of the Q45 and fitted it to a 4 inch intake - aiming for 600 rwhp with this set up

so would you have a high resolution q45 afm then? did it max out right on 560rwhp or was it a a while before that?

[Guilt-Toy]

380rwkw from my q45 afm, but it maxed out about 50kw ago

[VB-]

is there a way to see which q45 is high or low resolution without plugging it in?

wire it up and play with it

[R34GTFOUR]

This is where i start to get in the "flip a coin" state,

once my motor is built i'll be aiming for around 450awhp on the street and about 500+awhp when on race gas (not very often), but im not sure to run a powerfc and use a q45 afm or to use another ecu with a map sensor. Preferably i would like to use a afm, but it seems that 500awhp will max out one, and i didnt really want to run a y pipe in the intake and half the afm values mainly because i would like it neat.

if the q45 isnt up to the task, maybe i should just go map

Edited August 2, 2008 by R34GTFOUR

[R31Nismoid]

Just use a Z32

270rwkw PULP

370rwkw Sunoco 104 (more boost/timing etc)

I did that with a Z32 no problems.

[candy33]

I got 320awkw in my R32 GTR running a q45 afm with a 'yellow sticker on it' and it was fine...but have since gone Map sensor.

[Adriano]

You could always put a z32 sensor into a 4in pipe, that will see 400rwkw(or you can use the stock AFM, ends up at about the same) There is a thread in the fabrication section that shows how to do it neatly.

[SmittyR33]

Anyone tried wiring up 2 by stock or z32 afm's in parallel? Shouldn't that give you twice the resolution\airflow and you just tune to suit?

[R34GTFOUR]

thats what the gtrs have from factory, but there isnt two afm inputs for the normal gtst's gt-t's. The only thing i've seen that is simular to what you're mentioning is running one afm, but use a ypipe in the intake so it only get half the air. When tuning you then halve the afm values and you've effectively doubled the reading power of the afm.

I just dont like the idea of that because its not neat imo and it can be a bit rough for daily driving (cruising rpm)

[Scooby]

I got 320awkw in my R32 GTR running a q45 afm with a 'yellow sticker on it' and it was fine...but have since gone Map sensor.

what yellow sticker are we talking about? were you running the Q45 with a y piece or something similar to each turbo?

Cheers

[paulr33]

hello

this has been covered a lot in the past

to date, we have see no evidence of there being two versions of the Q45 - a high and a low - so its is believed there is only one version, yellow label, 3.5", 3 wire AFM

but we have known some users fly past 350rwkw with a Q45 and some hit a "wall" around 250rwkw+ish with the Q45's

so i suspect theres two outcomes

1) there are two versions

2) there is only one version and someone is picking up the wrong model AFM, or there is another cause for maxing the AFM

either way if you want near 350rwkw go for Z32

[R34GTFOUR]

what happens when you want 400-450rwkw's on one afm?