We setup a b16a with the afc hack. Walbro pump, dsm 450's afc.. the usual hack setup for a t3/t4e. Anyway.. the car wasn't running right so he took it to a shop where they fixed his alternator and added check valves. Instead of running -40 across the board it's now ~ -23%... what is the harm or good out of this? His car is running very strong like this, but who knows how strong it would have run without the check valves. There is no FMU on this setup also.. thanks for any tips!

Spike

 

if its not broken dont fix it, but I would say take the check valves off, and set it to -35 across the board for starters. I dont know if you saw my setup but I am running the same thing in my hatch. and why did you take the car to a shop to fix the alrternator? its like a 2 minute job to change. the whole reason to run the hack is to trick the map sensor. the check valves trick the map sensor by hiding it from boost, so to make sure the car has the correct levels of fuel you use a fmu with check valves, but now what is hapening on your friends car is the afc is spewing fuel in just like an fmu. -23 is very rich for the afc hack. the richest mine goes is -33 but I guess it works for you. just my rambleing 2 cents.

 

you are -33% because you aren't running check valves... while the 10% difference is made up by using check valves and hiding the boost.. It's actually a customer's car that's why we didn't do the dizzy ourselves.. we knew there was a problem because the car wouldn't idle and break up hard high end.. anyway.. is there any harm by running check valves and the afc? basically the afc is our FMU, just more expensive.. but would there be any advantage to tune it not to use the check valves? thanks!

 

Remove all the check valves. You DO NOT want them in ther with the afc hack.
Set the afc to -25 - -30 at 1000k, everywhere else set it to -38. That should be nice and rich.

Follow my advise. From reading your post, you dont sound like your 100% clear
on how the afc hack even works, if you are even considering leavint the checkvalves
in there.

 

I do understand how the afc hack works.. but it really wouldn't be bad to leave the check valves in there and adjust the afc accordingly.. it's just reading a different value off of the ecu map correct? there's really no harm in doing this as far as i know.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rioninja &raquo;</TD></TR><TR><TD CLASS="quote">Remove all the check valves. You DO NOT want them in ther with the afc hack.
Set the afc to -25 - -30 at 1000k, everywhere else set it to -38. That should be nice and rich.

Follow my advise. From reading your post, you dont sound like your 100% clear
on how the afc hack even works, if you are even considering leavint the checkvalves
in there.</TD></TR></TABLE>

please explain why he DOES NOT WANT THEM IN THERE.im very curious also.i run the missing link ,with a vafc and 370's,i do not run the hack on my vafc though.

 

putting in check valves defeats the purpose of hte hack. LOL... i really dont understand this world.

 

i understand that,lol, using -35 to kill the map sensor,or hack the ecu by cutting voltage to the map.what does it hurt to put in a check valve and only cut back-20 instead of -35.

what i dont understand is this,my car runs great,i dont use the hack,i use a missing link and i use my afc to adjust the a/f ratio,i use 370's.

the hack is just 450's and cutting them way back ,so you have 450's and not even using them really?cause your leaning them out.why not go with smaller injectors that will put you in more of a better range,then use something to kill the map signal to the ecu?

im not arguing,im just honestly curious.honest question.

 

that is exactly what I am wondering.. what's the difference between running -40% with no check valves or -25% with check valves.. either way it'll run the same correct? I understand it's not "the hack" .. but what's the difference? There's no power gain/loss right? thanks for any advice from people with experience from both.

 

you can run the check valves/missing link but i'd advise you to get it tuned. running the check valves will make the ecu see less boost...but the afc should still be set somewhat the same as if you were using the hack as the same amount air is still being pushed from the turbo. running the valves will just allow you to run more boost...nothing more.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rioninja &raquo;</TD></TR><TR><TD CLASS="quote">Remove all the check valves. You DO NOT want them in ther with the afc hack.
Set the afc to -25 - -30 at 1000k, everywhere else set it to -38. That should be nice and rich.

</TD></TR></TABLE>

i dyno'd my car and saw a couple other peeps who dont have the linear settings of 38 across....i was thinking it made sense to richen it up as u go along but i was so wrong....i have alot of lean spots in the low rpm and mid rpms....and if u have vtec i would recomend -31% when it kicks in cause the engine goes crazy lean when vtec and boost gets involved...
i have these settings with 9 psi:
-23 1k
-38 2k-3k
-35 3.5-4.5k
-31 5-5.5k
-33 6-6.5k
-31 7k-8k

 

afc hack can suck it. my car broke up top end and would run liek ******* regardless of the changes.

 

any more thought on this?

I'm helping my cousin out with his setup so I'm think about going afc hack.

 

if you put check valves in then the map can't see boost and doesn't add fuel. You will blow up your car.

Repeat: YOU WILL BLOW UP YOUR CAR.

If you manage to run it rich enough not to, then you 100% kill all part throttle driveablitiy.

It's a very simple concept. MAP signal increases = more fuel. Stop the ecu from seeing map increases, it stops adding fuel when 0psi comes around. Don't you people get it yet? You can run anywhere from 1-12psi and the hack (well, your ECU) automatically adjusts the fuel, because it READS THE MAP. You NEED MAP SENSOR input for the the hack to work. REPEAT: NEED MAP SENSOR INPUT!

 

If you run it with check valves you will be way to rich out of boost since you are just flooding the engine with fuel. Second it does not allow you to really run any more fuel or boost. At around 10psi with -38% the ecu sees about the exact same map sensor voltage as wot with check valves and the afc set to 0. This area is the highest duty cycles the stock ecu is programmed to flow and that is all the fuel you are gonna get out of the 450s no matter how you do it. Just because its at -38% does not mean you are not gonna be able to flow the same amout of fuel, it means it will just take more pressure to get to the point where the ecu flows the most fuel it possibly can(what the ecu thinks is 0psi). At-25 with check valves you should be actually flowing -25% less fuel than the hack is capable of and it would be too lean @10psi. Although you people may know how to setup the hack and what it does you dont see what its really doing and why it works.