MAF question

[Zimm]

so i recently baught wideband,apexi safc, will soon be buying bigger injectors and fuel pump... im wondering what MAF i need some people said stock some said Z32 or whichever and Q something maybe ......

Also with these upgrades do ya think i need to upgrade my coils(spitfires or yellow jackets) or are the stock ones fine

[NeptuneGTR]

That depends on what kind of power you're aiming for, stock air flow meters good for around 310 ps, stock ones can only flow 1100kg/h of air and support 310 max power. seems like the z32 are the cheapest, I saw one on here for sale for 100 bucks not too long ago.

as for the coils, I think stock is fine, I think I remeber reading somewhere that the AG-Y R32 uses stock coils, so if they are good enough for AG-Y you shouldnt be too worried.

[Skym]

If upgrading injectors, fuelpump, fitting stock Z32 MAF with Z32MAF plug (needs to be wired in) is a good idea at same time. Z32 MAF is rated to around 480hp. Although it depends on turbo size to when MAF will max out and what hp can be produced. A bigger turbo moves more air at a lower boost level than smaller turbo and produces more hp at same boost level. Usually MAF is upgraded when turbo is upgraded or are boosting up stock turbo (can produce 330hp at engine with stock turbo).

Stock coilpacks are ok. They can fail due to age (change them every 100,000kms or earlier if car has been thrashed in the past on racetrack) or due to using incorrect heatrange or gap with sparkplugs (learnt this the hard way).

[Zimm]

whats the best plugs to run as im driftin the car and kk so im not to sure about the z32 maf plug you were talkin about... if i bought a used z32 mAf would this be extr\a?

[NeptuneGTR]

This should awnser you'r question.

http://forums.gtrcanada.com/gt-r-tech/42609-spark-plug-question-2.html

And I think what skym was talking about is the pigtail, when you install the afm, you need a tune , beacuse the amount of energy needed to heat up the afm is diffrent from the stock one

[Skym]

NGK PFR5A (heatrange and hot tip) is stock for 215hp RB20DET (factory runs engine rich). With intake, exhaust your leaning A/F ratio out and cylinder temps rise, so you switch to NGK PFR6A (hotter cylinder temps = colder tip). Normally you change heatrange every 75-100hp or when you run engine richer or leaner. You'll have to read the sparkplug tips to see what engine likes.

RB25, RB26 use PFR6A heatrange when stock.

Sparkplug gap should be 0.8mm. Factory is 1.1mm.

[Zimm]

Where could a get Z32 MAF From?

[Skym]

Brand new from Nissan + need Z32 MAF plug. Or from a crashed or junkyard 300ZX / Z32.

[nelsonmxmarc]

AMS sells alternatives! Send them a PM, great guys to deal with. Good price too, as an oem Z32 maf will range anywhere from 80-160$

[Paradis]

I hate to be the devil's advocate here, but ima disagree with everyone on this topic.

A stock maf is fine. Show me someone who's level 1 bolt-on mods suddenly came into their own using a z32 maf. I ran over 300 at the wheels (so something like 350 at the crank) on stock maf and never had any issues. If the zimm guy is wondering where he can even locate a maf period, then i really don't think he's in the 300whp+ club. save yourself a few bucks, use your stock maf. I agree with Skym that if you're doing a major turbo upgrade, then ya. But at the point you should be looking at EM systems and just flip to a map sensor.

On the flip side, i would change your coilpacks. Outside of doing some major like putting a new turbo, coilpacks ARE one of the only bolt-on type things you can do and will see a difference, especially if you're turning up the boost and drifting (or trying to) and you're spending alot of time at the top of your revs.

[nelsonmxmarc]

I hate to be the devil's advocate here, but ima disagree with everyone on this topic.

A stock maf is fine. Show me someone who's level 1 bolt-on mods suddenly came into their own using a z32 maf. I ran over 300 at the wheels (so something like 350 at the crank) on stock maf and never had any issues. If the zimm guy is wondering where he can even locate a maf period, then i really don't think he's in the 300whp+ club. save yourself a few bucks, use your stock maf. I agree with Skym that if you're doing a major turbo upgrade, then ya. But at the point you should be looking at EM systems and just flip to a map sensor.

On the flip side, i would change your coilpacks. Outside of doing some major like putting a new turbo, coilpacks ARE one of the only bolt-on type things you can do and will see a difference, especially if you're turning up the boost and drifting (or trying to) and you're spending alot of time at the top of your revs.

Totally my bad! didn't see the hp goal.
Good point, i ran well over 300 crank with the stock MAF, it was nearly 100% duty but regardless, it will make decent whp (281 as a matter of fact). Another option is to have a resistor set in place. Our tuner does it locally, however, i have NO idea how it's done. It will alter the voltage readings and mimic a z32 readout.

Tyler (TW) has it done to his car.. Running 460 whp with stock mafs (GTR)

[Skym]

Upgraded MAF is calibrated differently. So you could alter the voltage from MAF to recalibrate it.

But you can use tuning tricks to extend MAF limit's (band aid fix). I noticed stock RB20DET MAF support a 370-380hp RB20DET engine with HKS 25/30 turbo at I think was 16psi. But it's best to upgrade MAF, as can get better hp result's as the tuning trick is a band aid at best.

Normally MAF is upgraded at same time as injectors, fuelpump. That happens when bigger turbo is installed or stock turbo is boosted up.

Similar band aid trick with injectors by fitting a bigger pump, adjustable FPR. With bigger fuelpump and no adjustments to fuelpressure, engine runs richer at mid to high rpm's due to injectors are open more. But it's best to upgrade injectors.

Also interesting thing I found out is stock R32 RB20DET injectors are not 259cc, as someone had them flow tested and were around 276cc. Explains why they support a 270hp RB20DET engine and have a 11.8:1 A/F ratio.

[nelsonmxmarc]

Funny Skym, i noticed the same thing with my GTR injectors! When i had them flow tested, they actually came out to 480cc each.

[Zimm]

well i already have a bigger turbo.. gettin bigger injectors and pump, i just got a wideband and apexi safc... plus my stock maf quit so need one anyways if ya think i should just run a stock maf then thats what i will do becuse a friend of mine has one... but if ya think z32 maf is better then ill do it that way...

[M13]

I maxed the Q45 MAF (much bigger than RB20) at 16PSI on my GT3071R.

I'm going w/ HPX+5 blow-thru.