m30 afm + 19lb injectors =afpr needed???

[kowalski]

the afm can be adjusted yes, there is a spring inside it that can be turned to make the flap stiffer letting less air in or loosend to let more air in.

[Bimmerfanatik]

This thread is another argument that will never be solved.

Can you run larger injectors without tuning? Yes.

Can you run an M30 AFM without tuning? Yes.

Can you run the both without tuning? Yes.

Will you be at optimum fuel/airflow ratios and performance? Doubtful, but I've seen crazier shit happen.

[gstuning]

I run a 2.0 with M30 MAF and 325i throttle body and manifold, with a crap exhaust no O2 to fix any mixture issues I created,

So yes you can put anything on there if you just adjust the freaking wheel,

Also tuning back to the baseline with a O2 is just ridicoulus, you should adjust the wheel so that incase of ecu reset, the mixture and results will be the same as before the reset

[Mystikal]

This thread is another argument that will never be solved.

Can you run larger injectors without tuning? Yes.

Can you run an M30 AFM without tuning? Yes.

Can you run the both without tuning? Yes.

Will you be at optimum fuel/airflow ratios and performance? Doubtful, but I've seen crazier shit happen.

This is the distinction I think a lot of people fail to understand. They seem to beleive that just because it works and they just added a few lines to their all-important mod lists doesn't mean it's all working nearly as well as it could be. Who knows, things could magically fall into place, but until I see a dyno graph and A/F curve proving that, I refuse to assume such an unlikely scenario.

[rwh11385]

doesn't mean it's all working nearly as well as it could be.

there's a line between fine and perfect..... and i think piggyback and an afpr could cross it, but most shouldn't really give that much of a damn.

for me, m30 afm + 19lb really opened her up on the highway. and moreso after the AFM was adjusted to stock tooth, not even moved two like most people do.

oh well. we'll see.

[Digitalwave]

With all the adjustments needed and shit, this mod is NOT WORTH IT AT ALL. think about it, you pay 60 for a dyno, say your battery dies or you disconnect it for something else, THERE GOES ALL YOUR TUNING YOUR ECU IS RESET

You are an idiot.

Think a little before you press reply. Tuning requires a AFPR and a dyno, you have to use that so your ECU programs itself the right way. Now if you're not at a dyno, which 99.999% of the time you're not at one, and your battery dies or ECU gets reset, then the tunings you have done will be gone and your ECU will learn the wrong way.

Tuning with an AFPR has nothing to do with your ECU. You have no idea what you are talking about. Our ECU's are barely, if any, adaptive. It's not like they can sense you put a bigger AFM and injectors and then pop out a new, optimized fuel map. Any adjustments that are made will be re-made after a bit after you restore power to the ECU.

So is the AFPR replacing a stock FPR?

Umm, yes. You aren't going to have two fuel pressure regulators on the car, and the stock one is not adjustable.

[madjurgen]

So let me get this straight. Increasing the fuel pressure through an afpr while on a dyno and monitoring the a/f ratio is the proper way to tune these mods (m30 afm+19lb injectors) or the bandaid way?

So no matter what mods I put in (excluding FI), the car should always run at a set a/f ratio? (i know it changes throughout the rpm range) What is this range? What is the maximum practical pressure to set the fuel at?

[zandi]

So let me get this straight. Increasing the fuel pressure through an afpr while on a dyno and monitoring the a/f ratio is the proper way to tune these mods (m30 afm+19lb injectors) or the bandaid way?

So no matter what mods I put in (excluding FI), the car should always run at a set a/f ratio? (i know it changes throughout the rpm range) What is this range? What is the maximum practical pressure to set the fuel at?

Yes, the car always had a set A/F ratio it should run at, im not sure exactly what that ratio is but I think its the same on all cars, correct me if im wrong. Reading this thread I can conclude that the AFPR is the correct way to tune these mods, but that is only for optimal performance, you can run the mod without a AFPR but it isnt strongly recommended, although you will still get some gains.

[h0lmes]

Ok I know this is an old thread but I am interested in the m30 afm and 19lb injectors. So tell me if I understand this right. With my Jim C chip I will not need to dyno my car if I install the afm and injectors??? Please only reply if you are knowledgable on the subject and not if you just threw these things on. Thanks.

[Digitalwave]

Ok I know this is an old thread but I am interested in the m30 afm and 19lb injectors. So tell me if I understand this right. With my Jim C chip I will not need to dyno my car if I install the afm and injectors. Please only reply if you are knowledgable on the subject and not if you just threw these things on. Thanks.

You don't have to dyno the car because dynoing the car isn't going to achieve anything. The only reason to dyno after these mods is to adjust your A/F ratio, which you can't do unless you have an adjustable FPR.

[rwh11385]

Ok I know this is an old thread but I am interested in the m30 afm and 19lb injectors. So tell me if I understand this right. With my Jim C chip I will not need to dyno my car if I install the afm and injectors. Please only reply if you are knowledgable on the subject and not if you just threw these things on. Thanks.

You don't have to dyno the car because dynoing the car isn't going to achieve anything. The only reason to dyno after these mods is to adjust your A/F ratio, which you can't do unless you have an adjustable FPR.

Negatory surfboy. A dyno run will tell you if you fucked up your A/F
and then you can worry about fixing it.

Or. You can confirm you don't need to do shit.

Either way, it achieves an experimental result which tells you more about your car.

[Digitalwave]

Kind of a catch 22. Buy the AFPR first, dyno, and see you don't need it... you lost money. Don't buy the AFPR, dyno, see you need it, buy the AFPR, dyno again... you lost money.

[Bimmerfanatik]

Kind of a catch 22. Buy the AFPR first, dyno, and see you don't need it... you lost money. Don't buy the AFPR, dyno, see you need it, buy the AFPR, dyno again... you lost money.

I still don't understand what the big deal is - are you guys who are running the afm and injectors without the afpr running 12 second quarters or leaving 4th gear patches? Does it REALLY make that big of a difference? And what about those who ARE running an AFPR? Aside from cold hard facts showing that an AFPR can noticeably increase the gains provided by larger injectors and a larger AFM, can anyone notice the difference on the butt dyno?

[h0lmes]

So would you recommend doing this with an AFPR or without?

[Digitalwave]

So would you recommend doing this with an AFPR or without?

I recommend with. But most will disagree (who also seem to be the ones that have the AFM and the injectors with no AFPR or dyno time).