Fuel setup when going low boost turbo (around 7psi)
 

Just curious what fuel upgrades are the norm when doing a mild boost (~7spi) setup. Would you:
1. Just upgrade FMU
2. Upgrade FMU and fuel pump
or
3. Just upgrade injectors

??? Or would it be best to do all three? I've always been confused about how an FMU even increases fuel just by itself. Logically it would seem that FMU and fuel pump have to go together. :S *shrug*

Re:Fuel setup when going low boost turbo (around 7psi)
 

With stock 240cc injectors an FMU/fuel pump setup would work under 7 psi. With the FMU/fuel pump setup fuel pressure will be really high and you won't be able to tune anything.

If you want to upgrade injectors you will need something to control them (afc hack, SMC, etc...). Getting larger injectors and some kind of fuel controller would be safer.

Check out the FAQ in the engine management section for more info. :)

Pat

Re:Fuel setup when going low boost turbo (around 7psi)
 

Well, my car is boosted for 2 days so far :D
I use FMU (10:1 ratio) and inline fuel pump.
I get arround 7psi boost, and so far works great. A/F meter shows rich.. car pulls really smooth with FMU. Hope to get this week to dyno to check exact A/F readings tho.
But.. if you do go FMU way - make shure you get inline fuel pump.

As for saying FMU suxx as you cannot tune it.. partly true, you can always change rings to change ratio. But, in that case, AFC is much much easier to tune. It all depends what you want...

Re:Fuel setup when going low boost turbo (around 7psi)
 

trust me, you'll want the afc and bigger injectors. the fmu's arent that great at all :-[

Re:Fuel setup when going low boost turbo (around 7psi)
 

I am of the opinion that chipping the ECU and running larger injectors is the best way to manage fuel. For the cost of an RRFPR you can usually get it chipped.

-Michael

Re:Fuel setup when going low boost turbo (around 7psi)
 

I agree, but he never asked about that so I didn't say anything. :P

Re:Fuel setup when going low boost turbo (around 7psi)
 

Becuase this is a 'junkyard' setup. I have clear goals as far as $$$ goes so I'm trying my best to keep under that. :P

Now with cars like mine (nissan), they have MAF. Would an AFC hack work with such cars? I thought that with MAF, any increase in air would automatically be corrected with more fuel so bigger injectors alone would take care of it without the AFC hack. Let me know if I'm way off.

Thanks.

Re:Fuel setup when going low boost turbo (around 7psi)
 

I dont have experience with MAF's, but I imagine what you said is tru only up to the point when you start putting positive pressure into the system. The ECU's were never mapped to see boost, and when they do they usually freak out and send the car into limp mode.

Re:Fuel setup when going low boost turbo (around 7psi)
 

So how would a FMU(12:1),FPR, and afc(hacked) w/ 450 injectors run? Good setup for 10 PSI fellas? This is what I will be running as soon as I can find a good buy on an AFC.
:-\

Re:Fuel setup when going low boost turbo (around 7psi)
 

you have officially ventured into uncharted territory here on HMT. I haven't heard of anyone on here w/ a MAF.

Re:Fuel setup when going low boost turbo (around 7psi)
 

cars that just run off a maf dont see boost, just airflow as far as i know. but just throwing injectors in there might not work too well (dsm guys do it, but most get an afc as well)

Re:Fuel setup when going low boost turbo (around 7psi)
 

I dont know any better, but i would get a 12:1 FMU and call it a day....atleast you know you wont be running lean ;D

Re:Fuel setup when going low boost turbo (around 7psi)
 

I have a MAF sensor in my car and have 440cc RC injectors. I would highly recommend getting an AFC to lower the voltage output of the MAF sensor. Without the AFC, my car would not idle and anything other than full throttle (close loop) was shitty. The AFC hack doesn't really apply to MAF equipped cars. The only time you would get a CEL is you have way more airflow than the MAF sensor can read with the AFC already compensating for it. At this point you could use dual MAF's so the sensors send out half of the voltage to the AFC (not necessary for 7psi ;) ). The AFC has this feature and just takes the average of the two sensors and sends it to the ECU. Too much trouble in my opinion, it would be better just to get a standalone, or if they offer it get your ECU chipped.

Re:Fuel setup when going low boost turbo (around 7psi)
 

hmm...does your maf have an adjustment on the bottom like a dsm one does?...you may even be able to swap out your maf for another one, but im no expert

Re:Fuel setup when going low boost turbo (around 7psi)
 

ok, so i'm leaning towards injectors and AFC. what's the cheapest AFC I can get that's not crappy quality? any suggestions I can look into?

Re:Fuel setup when going low boost turbo (around 7psi)
 

Get the Apexi S-AFC, works great for me. Check the for sale section of this forum, they have great deals.

Re:Fuel setup when going low boost turbo (around 7psi)
 

Those are too expensive for me. This should work fine for my app right? ;)
https://i9.ebayimg.com/02/i/01/35/24/a6_1.JPG

Re:Fuel setup when going low boost turbo (around 7psi)
 

I'm not too familiar with that one. I know the one with 5 knobs have a knob for each RPM setting. I would really try to find one of those. I think that AFC has only one RPM setting that goes throughout the rev-range. I am pretty sure that it will work to a certain degree, just don't get injectors that are too big. If this item is used make sure you get the harness too. Good luck.

Re:Fuel setup when going low boost turbo (around 7psi)
 

Yea, I would preferably like to get the 5 dial one to controll different rpm range but i might settle with this. remember i'm not gonna run much boost with this. and i'm pretty confident that won't change in the future. i got enough money going into my turbo honda as it is. :'(

Re:Fuel setup when going low boost turbo (around 7psi)
 

Check this one out... only a bit more. http://cgi.ebay.com/ebaymotors/ws/eB...tem=2455855034

Re:Fuel setup when going low boost turbo (around 7psi)
 

That one on ebay will only drop to -30% which might be a bit rich for 450cc's. If you ran 410's or something, that would be great (and cheap, my favorite).

Re:Fuel setup when going low boost turbo (around 7psi)
 

Do both Apexi (1 dial and 5 dial) drop to -30%?