Z32 Vs Q45...

[nsanity]

Hi guys,

I have a mildly tuned skyline that seems to have everything done to it, bar injectors and AFM. Thanks to someone's "tuning" guide on the forums (can't remember the name) it mentions that before you bolt a new turbo on, AFM upgrade is a good idea.

The guide mentions that in higher output situations the Q45 has a higher throughput, and i'm wondering if there is any reason why you wouldn't just grab a Q45 as opposed to a Z32 (less response maybe?)?

Currently have a stock Turbo, but like i said, its AFM then injectors then turbo (with a full tune in there somewhere too) to push to 250ish rwkw (from 194 noe).

Any advice would be appreciated, as i come from a Carby Background, bolting on a 780cfm Rochester doesn't look like it would do the job .

Cheers,

Geoff

Edited September 1, 2006 by nsanity

[paulr33]

the z32 is fine, its good for beyond 350rwkw and wont pose a restriction.

people would likely use a q45 for larger intake turbo piping and more resolution. but with the q45 comes the issue of changing pipework and likely pod filter or airbox connect as its 90mm instead of 80mm so standard airbox, pods etc won't fit.

[nsanity]

the z32 is fine, its good for beyond 350rwkw and wont pose a restriction.

people would likely use a q45 for larger intake turbo piping and more resolution. but with the q45 comes the issue of changing pipework and likely pod filter or airbox connect as its 90mm instead of 80mm so standard airbox, pods etc won't fit.

So i'd still be left with a nice fair of quality all-round turbo's with the Z32 and standard piping installed? If there is a killer all round turbo that suits the q45, i'd probably look at that.

I want something that is as responsive as it can be, but still packs a bunch when you put the hammer down.

[paulr33]

any of the reasonable sized inlets will suit the z32.

theres no need to choose a turbo based around the afm size and pipework.

with the z32 you can use the standard afm duct piping or you can even go the apexi power intake or a custom one to suit the stock afm, as the z32 is identical in size and same shape/bolt pattern

whereas q45 is completetly different

[Sydneykid]

I would only use the Q45 AFM when I needed the extra resolution for the extra power output. They don't meter as well as the Z32 at low airflows. So if you don't need the big airflow, use the Z32. The car will run nicer and get better fuel economy, plus it will be a damn side easier to tune.

cheers

Edited September 1, 2006 by Sydneykid

[nsanity]

I would only use the Q45 AFM when I needed the extra resolution for the extra power output. They don't meter as well as the Z32 at low airflows. So if you don't need the big airflow, use the Z32. The car will run nicer and get better fuel economy, plus it will be a damn side easier to tune.

cheers

exactly my concerns

cheers for that

[T04GTR]

if only you could get a q45 non-genuine. oh well. ie,, if its in a bosch box its a non gen lol

[anticeptik]

i was under the impression that the z32 afm didnt flow any better then the original afm from a r33????

[T04GTR]

not flow. but tuning resolution

[khunjeng]

I recently installed a VG30 AFM which diretcly bolts on to the rb25 intake. I was told its good for 350rwkw

I was of the impressed the VG30 is the same or similar to the Z32 AFM. Can some1 confirm. THe VG30 I assume means it came off a 300ZX type engine and the Z32 is the AFM type.

I followed the following process after reading stuff here.

Get a new ECU - at the time I had an Emanage installed which was ok to a point

Zorst inc. 730CFM cat

Dump/front pipe

AFM + fuel pump + manual boost control

Turbo upgarde - custom high flow in my case

FMIC

AVCR for better boost control

Injectors

CAI setup - although I did this more for the looks.

PFC - is comming in 1 week.

This gets you a good results on the road, not so good for your bank balance

[nsanity]

So i visited Zebbie and Vader today.

Zebbie thinks that my car "lacks punch" 4.5k rpm onwards.

According to the powerfc, duty cycles aren't going past 70.9% (several hills and very very aggressive accelerations to test).

The car feels like its just plateauing.

Thommo (the guy i bought the car from) mentioned it was tuned by ICE down in Melbourne (who i'm told have a good rep), would the car benefit from a Z32 or similar (peak readings were roughly 6.8k rpm, 0.992 bar boost (capped at 0.8 apparently), 70.9% duty cycle) at this stage? I have the option to purchase one, and i'm getting the car once overed by the guys up here in Canberra.

Or do i really need to look at a better turbo?

SydneyKid was mentioning you get boost cut from the stock AFM around the 9 - 10 psi mark, which could explain the flatness around the 4.5k - 7k mark under full throttle maybe.

If its not going to be a substantial upgrade (10 - 15rwkw), i will wait till i do the turbo as well, but if its worth doing now, i'll get it done.

Also, on a sidenote - my injectors are upgraded ones it would seem?

Edited September 2, 2006 by nsanity