Airflow with a Z32 mafs, any thoughts?

[Rownan]

I am swapping in a Z32 mafs soon here and using my s-afc I just got to tune for it.

I'm experimenting.

Anyway, I figure when I put in the bigger mafs, it will read more airflow, therefore the mixture will be richened. Correct? So should I expect a richer condition before tuning?

Another guy I was talking to said that he believes the 300zx mafs has the same size sensor as the stock 240 unit, so it will read the same amount of airflow. However due to the bigger size it will increase airflow, thereby making for a lean condition. So should I expect a lean condition before tuning? If this is so I may invest in some bigger injectors... I am running a high compression KA and do not wish for my engine to blow up due to running too lean....

Any thoughts, ideas? Anyone familiar with the Z32 mafs that can refute?

11:1 KA for ur mommahttp://www.projectaspec.com

[I am Technoman]

I would suggest a piggie back like the greddy E manage or send your JWT ECU back to Jimmy! If your ECU is not programmed to read that much air flow you will have problems. I would think you would be lean during high engine load. your fuel map will run out before your air mixture.But hey i could be wrong.

[Rownan]

I would suggest a piggie back like the greddy E manage or send your JWT ECU back to Jimmy! If your ECU is not programmed to read that much air flow you will have problems. I would think you would be lean during high engine load. your fuel map will run out before your air mixture.But hey i could be wrong.

JWT downtunes their maps, which is the whole reason for the s-afc in the first place. I am hoping I can fine tune jim wolf's system and squeeze out that extra horsepower that they missed.

The Apexi S-AFC has the ability to tune for the Z32 MAFS so it will convert the voltage signal to something the ECU can read. In theory it should work out fine, however I am in the dark as to what to expect before I begin tuning.

[TrunkMonkey]

I am swapping in a Z32 mafs soon here and using my s-afc I just got to tune for it.

I'm experimenting.

Anyway, I figure when I put in the bigger mafs, it will read more airflow, therefore the mixture will be richened. Correct? So should I expect a richer condition before tuning?

Another guy I was talking to said that he believes the 300zx mafs has the same size sensor as the stock 240 unit, so it will read the same amount of airflow. However due to the bigger size it will increase airflow, thereby making for a lean condition. So should I expect a lean condition before tuning? If this is so I may invest in some bigger injectors... I am running a high compression KA and do not wish for my engine to blow up due to running too lean....

Any thoughts, ideas? Anyone familiar with the Z32 mafs that can refute?

11:1 KA for ur mommahttp://www.projectaspec.com

wow, this is a good one.

if the sensors are the same, then you should be running lean before tuning, i'm not sure that larger injectors would be necessary once it is tuned.

BUT since no one else has done this before, i'd run larger injectors first. it's always best to start rich and lean it out.

-demetrius

[Rownan]

wow, this is a good one.

if the sensors are the same, then you should be running lean before tuning, i'm not sure that larger injectors would be necessary once it is tuned.

BUT since no one else has done this before, i'd run larger injectors first. it's always best to start rich and lean it out.

-demetrius

Yeah, that's what I was thinking.. I was hoping I could get away without having to get larger injectors but that is just a wish, they right way to do this is to get some bigger injectors..

Supposedly the stock injectors are only good to about 200rwhp anyway, which is just about where I hope to be after this.

Guess I'll start looking for some 370ccs from the SR crowd.. They also came in the Z32TT didn't they?

I am running a Z32TT fuel pump currently, would you suggest after installing the injectors that I run some kind of FPR?

Thanks for the help!

[TrunkMonkey]

Guess I'll start looking for some 370ccs from the SR crowd.. They also came in the Z32TT didn't they?

yes, but i've heard that the early model TT 370s don't fit.

I am running a Z32TT fuel pump currently, would you suggest after installing the injectors that I run some kind of FPR?

i would.

-demetrius

[Exar-Kun]

I'd get a set of 370cc sr20 injectors, they drop right in, and definately get some form of FPR.

the a-afc, TT pump, and JWT ecu should keep everything else you need in check, and run fine after some tuning.-chetI, myself am going to run:550cc apex-i injectors(side feed drop ins)Walbro fuel pumpEFI fuel pressure regulatorAPex-i S-afc300zx MAF

for my fuel needs when i go turbo...I think that should cover it, at least until 300hp or so.-chet

[Rownan]

I'd get a set of 370cc sr20 injectors, they drop right in, and definately get some form of FPR.

the a-afc, TT pump, and JWT ecu should keep everything else you need in check, and run fine after some tuning.-chetI, myself am going to run:550cc apex-i injectors(side feed drop ins)Walbro fuel pumpEFI fuel pressure regulatorAPex-i S-afc300zx MAF

for my fuel needs when i go turbo...I think that should cover it, at least until 300hp or so.-chet

Nice!

And thanks for the input! :ylsuper

[Movingviolation240]

I honestly don't see you getting 200rwhp on an NA ka. Not saying it can't be done, but even with 11-1 comp and cams the most I've seen is high 180's. That leaves a long ways to go. Your also going to run a lower (or is it lower lol) BSFC on a NA motor so I think more like 215-220rwhp would work on stock injectors.

I'd stick with stock injectors for now, and I really don't know if your wasteing your money on the Z32 MAF... The stock S14 looks like it would flow pretty good.

PaulOrlando, FL

[Rownan]

I am running 180 to the wheels now.. With JWT's crappy tune, wussy cams, stock flywheel, and very little headwork. I am positive I can make 200hp.. Will the s-afc, Z32 airflow sensor, and bigger injectors get me there? We'll find out. If not I'm sure some more aggressive cams will do the job.. My Colt stage 2s are so weak that JWT didn't even have to change their tune for them. Which is actually one of the areas I am hoping to cover with the airflow controller..

I'm not sure what the Z32 mafs will do for me, but if the s-afc will allow me to use it, why not go ahead. It's 80mm, plenty big I think, and if it doesn't help the it low then I can garauntee it will make a difference in the high revs where my engine makes most of its power. You just listen to the filter when I'm at 5 grand, that thing is FLOWING LIKE A *****. I figure if nothing else it will remove the bottleneck and smooth out airflow.

And if you honestly think I can get away here with stock injectors please tell me so! That is what this thread is about. Tell me your reason for thinking so. You've read my concerns of course.

Tim

[Movingviolation240]

it takes less fuel per HP on a NA motor than a turbo motor. The injectors are flat out at 200rwhp on a turbo motor only because they are running richer to make it safe. NA you can run it a bit leaner and still be safe.

I know guys making 11 second pass' on Honda's that are running 330cc injectors all motor. To do that on a turbo you'd be running 720's or bigger. That's an extreme example but you get my point.

PaulOrlando, FL

[TrunkMonkey]

paul is right.

i never looked at it like that, but even at 11:1 compression, you're never going to run as rich as a low boost setup. and since JWT tunes on the rich side to be safe, any leaning effect the Z32 mafs has may be cancelled out.

-demetrius

[I am Technoman]

I think this is a great idea! What I would do is upgrade the injectors anyway! Do MAJOR head porting to inhale the fuel. The manifold needs to be opened up as much as possible by honing it. And just open that N/A motor up to get in as much air as possible use the Z32 MAF and adjust the air/fuel mixture. And I know you will get 200WRHP or more easy!

The trick will be the porting.

[Rownan]

I think this is a great idea! What I would do is upgrade the injectors anyway! Do MAJOR head porting to inhale the fuel. The manifold needs to be opened up as much as possible by honing it. And just open that N/A motor up to get in as much air as possible use the Z32 MAF and adjust the air/fuel mixture. And I know you will get 200WRHP or more easy!

The trick will be the porting.

YES! My engine is all ready to make huge power, except it's limited by the intake manifold and the head.. With a custom intake manifold that's where the key is. A lot of people toy with individual throttle bodies to smooth the intake flow but that is a lot of work.. I've done basic port matching in the top end but I'd really like to do some port honing to open it up a little bit.

200rwhp is nothing if I start into that..

[I am Technoman]

YES! My engine is all ready to make huge power, except it's limited by the intake manifold and the head.. With a custom intake manifold that's where the key is. A lot of people toy with individual throttle bodies to smooth the intake flow but that is a lot of work.. I've done basic port matching in the top end but I'd really like to do some port honing to open it up a little bit.

200rwhp is nothing if I start into that..

YUP YUP!

[Movingviolation240]

me and a good freind of mine from the board here have a bet going between us that he can't make 200+rwhp on the dyno on pump gas. If you want I'll include you in it

The bet is for some pretty big money (for a starving CFI like myself anyhow) one whole dollar.

let me know how the thing dose, I'd like to see some nice allmotor numbers from a KA, but I just don't think the DE will do it.

PaulOrlando, FL

[I am Technoman]

Well my KA can make 200RWHP if I make it . I bought a DE head for 40 bucks that Im going to port like crazy and have my friend do an inside port polishing. This head work will take some time but will be well worth it!

O and the mani will be "honed" out alot!

MY MOTOR NEEDS TO FLOW.......

[Movingviolation240]

your motor needs boost my freind..... hehe

[NateDogg]

I like your enthusiasm! I have a couple suggestions:1) Why not just make a short runner manifold out of the stock one?2) Make sure to have the head flow-benched and evened out so all cylinders are getting the same volume.

[I am Technoman]

No I like the long runners their good for torque. I lost torque because I removed my Cat so i dont wana lose any more.If I were to go turbo I would cut the mani.

[I am Technoman]

Paul, lead me not into temptation!!!!

[Movingviolation240]

but deliver me from improper aspiration.....

[TrunkMonkey]

but deliver me from improper aspiration.....

now THAT was a good one.

-demetrius

[I am Technoman]

LOL

[Rownan]

me and a good freind of mine from the board here have a bet going between us that he can't make 200+rwhp on the dyno on pump gas. If you want I'll include you in it

The bet is for some pretty big money (for a starving CFI like myself anyhow) one whole dollar.

let me know how the thing dose, I'd like to see some nice allmotor numbers from a KA, but I just don't think the DE will do it.

PaulOrlando, FL

I will most definitely be posting a dyno chart as soon as the works is done, and will report my success with the tuning!

I don't want in on the bet however, a little rich for me. :p

BTW I'm posting this from Daytona, I'm on vacation.. Too bad I don't have my car down here...

DUDE THE ROADS DOWN HERE F'N OWN! I think I will be moving soon haha Michigan roads are killing my S14.

Tim

[I am Technoman]

Fl rocks !

[Voodoo]

me and a good freind of mine from the board here have a bet going between us that he can't make 200+rwhp on the dyno on pump gas. If you want I'll include you in it

The bet is for some pretty big money (for a starving CFI like myself anyhow) one whole dollar.

let me know how the thing dose, I'd like to see some nice allmotor numbers from a KA, but I just don't think the DE will do it.

PaulOrlando, FL

Psst....

Remeber the '99 Z concept car that was based on an S-14 chassis and ran a NA KA24DE?

Listed 200 hp and 180 ft/lb of torque...

The guy that built it told me on the phone that it was closer to 215hp, 190 ft/lb....on 93 octane

You might lose some $$

[Movingviolation240]

we'll see.... but that bet's RWHP on pump gas (93 max but he swears he'll see it on 91)

either way it should be fun to see what he comes up with.

Paul

[Exar-Kun]

Its possible, I've seen miata engines get like 160rwhp form that itty bitty thing.-chetnon-boosted(turbo, supercahrger, nitrous) either!

[Rownan]

Found the 300zx mass airflows sensor, tuning to start soon.