Possible to idle? Anybody care to test this?

Bags is running ~400cc injectors without turning down the base fuel pressure, so I'm hoping to turn down base fuel pressure to ~28psi for 500cc or ~23psi for 550cc. It should work, but atomization/injector on-off time might be an issue.

Just trying to come up with a non-JWT/eManage solution to running superdave2's injectors with just an AFC and FMU.

 

yeah, i would like to know too because i already have most of the components of that system. (adj fpr, afc and a the crossover pipe for the z32 maf)

would a q45 maf work?

 

Maybe...GOOD point.

There are even larger MAFs out there, so maybe one of them can compensate for the % increase in injector size.

I'd bet the 5.6L Titan uses a hell of a MAF.

 

thats what i was thinking.

 

well just remember, like I posted, the Airflow % readings were within .1 Volt @700 rpm and .2 volts @900 rpm.

 

On cold starts I shoot up to ~1200-1300rpm and then slowly drop down to ~900rpm.

The MAF voltage is non-linear, so a 0.1-0.2V could be enough.

 

mine starts up around 1k

 

Okay....anybody with an eManage, Z32 MAF, 500+cc injectors, and an adjustable FPR willing to set your A/F corrections to zero and play with fuel pressure to see if she'll idle?

 

I'd do it, but i don't have the z32 maf.

 

Is the only difference in the MAF's the size of the tubing? Or is the sensor actully different?

 

Size is the same...sensor is different.

 

What whp are you pushing?

 

welll Ice, my current setup is a32 maf 370 injectors, and 10psi untuned which I think is about 320 whp but My 590 cc injectors from i30miket will be in tomorrow and I will turn up the boost. new fuel pump today new injectors tomorrow and new clutch on the weekend

 

What are using to tune with?

 

Well you definitely need a Z32 MAF or larger then to keep a metered airflow referenced system, since the A32 MAF is outflowed at ~290whp.

 

well i am tuning with the emanage and have the emanage map sensor so I don't have to go to a bigger maf, its just a little easier to tune with thte larger maf

 

I don't believe that is true, but I could be wrong.

The way I understand it, you can use the MAP sensor to tune past the MAF limits, however from then on you're running "blind". In other words, whatever you set it and forget it at on the dyno, if anything changes, ie weather/boost/etc. that causes more/less air above the MAF limit, the system won't compensate.

I guess it's no worse then a non-airflow referenced system, however personally I think that's not the way to go. I'd rather have the MAF within range, so it can dynamically meter any increases/decreases in airflow and the ECU will automatically compensate.

 

Well, that's why i said I would rather the f150 maf if it works. then tune from there

 

and IMO its not a very efficient method if a larger MAF option exists. you'll still need the larger MAF in the long run...the Greddy Pressure sensor does not adjust for anything when you exceed stock MAF voltage..it only allows you to view "estimated" voltage and then tune it yourself from that, it does no self tuning as many believe. if you're doing all that extra work by then, comparing the sensor voltage from the datalogs and then applying it to making your map...you could get a Z MAF and be say screw all that and just make your tuning runs as normal.

EDIT: I guess I take too long to type...Ice said the same thing. I'm pretty sure I saw NAPA selling the aftermarket 5.0 or 4.6L Ford MAFs for $150. at this point, I sguess al you can do is try it

 

I think Mardi will be pioneering this AGAIN...as usual.

 

i would, but i need to use another car. i might steal one of my parent's cars when they go to vegas in 10 days.

does anyone want to let me borrow some injectors?

i only live 20 mins away from mike, maybe i could "convince" him over a drink or two

 

Hey Mike...how about that?!?!?

This COULD increase sales for your brother. I know others are interested in a non-JWT/eManage route.

 

he's just mad that i wont post up the vids of him beating me at the track.

if anyone can host--pm me

 

There is a boosted Max owner who is going to test these out already, and I believe they will be tuned with eManage. Dave finished 30 injectors last week and they all sold within a couple days, he is finishing 40 more this week.

 

Without the eManage right?

 

No, with eManage from my uderstanding. I don't know about running that large of injectors with just an SAFC....but I wouldn't really be the one to know for sure.

 

We are trying to find someone to test that a Z32 MAF and adjustable FPR can idle the 500cc's.

According to Bags 400cc example, turning down base fuel pressure COULD work.

 

ill give them back, we can even do the install at your house. i would just like to see if the z32maf/a32 ecu combo would work.

i have already done the math. dave's injectors are 33% larger than the 370's so i would have to drop base fp to about 26 psi.

 

I am not the one who does the modification to the injectors....and my brother lives 800 miles away from me.

 

Well that sucks...so there is no way he could mail you a set to test try?

 

I will see.....he is having a hard time keeping up with demand right now

 

Good...hopefully one of them will attempt it.

 

BTW.. I have learned if the car cranks and you shut it off instantly or almost cranks and you stop cranking it, it then is almost flooded. It's VERY hard to start. I verified this once by accident and reverified 3 times on purpose.

Turn the key until it starts in 50 deg weather, no problem. It's getting colder here, so we will see what happens.

Again, just FYI

 

That will improve by turning down base fuel pressure.

 

i know mike, im just giving you some grief. funds will come in about two weeks to be able to buy them.

 

right, just throwing out info about my setup. I don't want everyone to think it can't cause a problem

 

StephenMax did the same, however with a SC which moves more air at idle and 370cc.

 

Come on....anyone try this combo yet?

If not, what's the hold up with superdave2 selling 5XXcc injectors for so cheap/easy?

 

get me the injectors and I'll try it


Seriously, if I had the $$$ I would. If I knew someone with 500+cc injectors, I'd try it out

 

Fock, I can't swing $300 right now or I would.