I'm only running 6psi on my stock engine, and I am trying to decide on either putting an FMU at 12.1 or an Apexi AFC. If I run the AFC would I have to add anything more to my fuel system to handle 6psi? I think the AFC would be a better investment than a FMU.

 

I had a guy tell me it would be better to use a greddy rebic III if I want to control my injectors, but I'm not sure. Would an AFC still give me good half throttle with 6 psi?

 

The AFC would not be a bad idea at all. And 6 psi should be sufficient with a stock pump. ANything higher i'd say get a new intank pump.

 

just use a fmu. you can use the afc to tune the higher rpms where it will be rich.

 

1. a 12:1 FMU at 6 PSI will run your motor lean
2. a stock fuel pump will not support a 12:1 FMU
3. a AFC will not support a turbo motor unless you do the hack

This means you need a intake fuel pump, FMU and SAFC

 

Could I use an AFC if I used the 4 check valves between the manifold, and the map sensor? That would trick the ECU, but would the AFC still work properly?

 

12:1 and 6psi=rich, not lean

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by soundman &raquo;</TD></TR><TR><TD CLASS="quote">Could I use an AFC if I used the 4 check valves between the manifold, and the map sensor? That would trick the ECU, but would the AFC still work properly?</TD></TR></TABLE>

AFC hack is used without the help of check valves. And when you say "You'd have to do the hack" you're just modifying settings not adding anything. Read up on the VAFC hack on here and http://www.thedropshop.tv and then make your decision.

 

You can use the check valves....I am using the check valves (5000 miles) with the hack + 6psi and i am still running too rich.... but then again I have
inline+fmu 12:1+V-AFC......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Xscream &raquo;</TD></TR><TR><TD CLASS="quote">1. a 12:1 FMU at 6 PSI will run your motor lean
2. a stock fuel pump will not support a 12:1 FMU
3. a AFC will not support a turbo motor unless you do the hack

This means you need a intake fuel pump, FMU and SAFC </TD></TR></TABLE>

you DONT need an FMU with the hack.....

 

Really - tell my car that- its no where near lean under partial boost

 

Yeah I'm not a hack supporter, I was refering him to not do the hack and do the good ol' FMU way

 

I want to have my fuel system right, while being able to make any changes that I want. So if I do the hack, can I still make fuel tuning adjustments at certain RPM?

 

Yes you can

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Xscream &raquo;</TD></TR><TR><TD CLASS="quote">1. a 12:1 FMU at 6 PSI will run your motor lean
2. a stock fuel pump will not support a 12:1 FMU
3. a AFC will not support a turbo motor unless you do the hack

This means you need a intake fuel pump, FMU and SAFC </TD></TR></TABLE>

a 12:1 fmu at 6psi wont make you lean. it will make you run rich. a stock fuel pump will not support 6psi alone. the relationship between a fmu and a fuel pump is at default. thats why you get an inline fuel pump to provide more fuel. a AFC will provide support, whetheror not you do the hack.

i recommend getting the fmu and inline fuel pump. use an AFC to tune the higher rpms so you wont be running rich. i you can afford to buy hondata... do so.

 

Go for the AFC and run the hack. Just make sure u get larger injectors like 450s. Any higher than 6 and I would recommend getting sumfin like a Walbro.

Of course this is no real replacement for sumfin like the Hondata but is a good cheap fix in the mean time. I'm running the hack at the mo at 6psi and it feels absolutely amazing. I will only go for the Hondata if I rebuild and run higher than 10 psi.

 

Every body says use the AFC and run the HACK what are they talking about. I always thought that THE HACK as every body calls it is just slang for hacking in to your ECU wires with the AFC. So when you say HACK are you saying there is another way to wire in the AFC or what I would like to get an answer to this because every body keeps talking about it like there are two different ways to run it. I have had my AFC in my car for about a year and it work fine, but I’m about to put my turbo kit on in the next week or so and would like to know if I need to rewire my AFC.

And as fare as the post I was just going to run the V-AFC,255 fuel pump, and DSM 450. No FMU and no check valves at about 7 to 10 PSI and a lot of dyno time!!!!

 

Archived search for hack, read up. You're making the VAFC modify the values the ECU sees for the map sensor so you won't throw a CEL.

 

I have the non-vtec, but I'm planning on going to the Vtec head in the future. Will the V-AFC work on a non-vtec head?

 

yes, just get the s-afc though since you don't need v-tec control (unless the v-afc is cheaper)

 

well, an AFC without bigger injectors wont work too well, so instead of getting the fmu, id spend it on injectors and have some money left over, you wont run lean.

 

I have the dynosheets to prove that on MY motor (which is 100% stock) that a Walhbro 255 Fuelpump, Vortec 12:1 FMU (that was just rebuilt) and a SAFC made my car run lean - would you like me to post it? 17:1 is lean last I check anyways

 

ok well the proper sized injectors and an AFC wont cause a lean condition.

 

dont mean to rob the post but i feel it might help your post anyways., but right now i have a walbro intank 255lp/h in my car, rc sl-440s in my room and vafc still in box. im only running 6psi right now untuned. this is all the stuff i need for hack? or am i best off on still investing in the uberchip and using the vafc to fine tune? im getting sick of this stuff sitting in my room and i would like some good advice thanks.

btw. 6 psi got me a 13.5@102 bump

since i have all the parts right now besides boost controller can i just hook up the vafc, remove the fmu and put in my bigger injectors and use the settings on dropshop.com and im good to go? will that get me to a dyno? or am i better off having them install it all when i get there. i guess what im asking is , if i use the vafc hack and do it myself, will that be good enough, even if im not tuned or will it be worse than just having the check valve and 12;1 fmu untuned? cuase my setup isnt giving me any problems. thanks

 

I'm running stock injectors