Alright, I searched and didn't really get what I wanted. On a turbo car, is the hack necessary to tune? I've got a v-afc and am thinking about getting a turbo kit, and it comes witht he FMU as far as I know. Would this be safe to run the stock 7 psi? I'm not looking to push it past that until I get more money and build the engine and ****, so would it be worth it to buy the injectors, resistor box (or make it), and do the hack? All info. is greatly appreciated, and sorry if I don't come across clear, I'm fighting a homecoming hangover

MAtt

 

tuning=the heart of every turbo car. If you are asking if it needs to be tuned I would suggest you either read a WHOLE bunch before you go turbo or just stay the hell away from it. A FMU cannot be tuned, and the VAFC hack isnt exactly the greatest either. Here is everything you could ever want to know about the VAFC hack.
https://honda-tech.com/zerothread?id=137901

 

yes, My friend is running the hack on his car untill he can afford hondata and it was really easy to setup and tune the a/f. car runs very nice for what it is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ricey McRicerton &raquo;</TD></TR><TR><TD CLASS="quote">tuning=the heart of every turbo car. If you are asking if it needs to be tuned I would suggest you either read a WHOLE bunch before you go turbo or just stay the hell away from it. A FMU cannot be tuned, and the VAFC hack isnt exactly the greatest either. Here is everything you could ever want to know about the VAFC hack.
https://honda-tech.com/zerothread?id=137901
</TD></TR></TABLE>

an FMU can be tuned...Although it is not one of my favorite methods of fuel management...People have gone really fast and made alot of power with FMU's. It does the job for what it is...

 

You can tune with both the FMU and AFC (VAFC or SAFC). As mentioned before some people here have made big power with the FMU but there are also alot of cars boosted running on the hack here including myself. I've never used the FMU route but people who have used both says that the AFC is a much cleaner, simpler and better way to provide the fuelling and I can also understand why. As you've already got the VAFC I suggest that you get some injectors and do the hack until you can afford Hondata or some other ECU as the hack is by no means fool- prove/safe way to fuel a turbo setup, it should only serve as a temp measure if you've got the kit already.

An awful lot of posts on the hack here if you search carefully enough and I suggest reading up as much as possible until you understand the concept before doing it.

My 2 cents.

 

I would recommend the AFC hack over the FMU option any day. Since you also have a VAFC, it's also the cheaper option. FMU's are $$$, so you can probably ebay if for a decent amount of money. All you need now is a set of DSM 450 cc injectors, which can be had easily for less than $80. Chances are you'll need a resistor box (cheap), or some resistors from radio shack (cheaper) to wire them up, then you're set.

A suggestion: Do the fuel stuff before you touch anything else. Get the "hack" up and running well on your NA car first. It will work just fine without a turbo... as if you're in negative boost. That way, when you do the turbo install, trouble shooting gets a lot easier.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fsp31 &raquo;</TD></TR><TR><TD CLASS="quote">A suggestion: Do the fuel stuff before you touch anything else. Get the "hack" up and running well on your NA car first. It will work just fine without a turbo... as if you're in negative boost. That way, when you do the turbo install, trouble shooting gets a lot easier.</TD></TR></TABLE>

Good point

 

The only way that you can "tune" an FMU is by swaping out the disc inside it, thats not really tunning it because based on your injector size it will really only run correctly on one of the discs (stock injectors runs okay with12:1 etc.etc.) After that, if its rich a tad, or lean a tad, your stuck, nothing else you can do to fix it as far as using the fmu. Just something to keep in mind. If you on a budget why not look into something like uberdata or crome? there both excellent rom programs, you just kinda have to have a little knowlegde about the obd1 ecu.

Rob

 

why does everyone attack the afc. it works well but it does have limits. i can't afford hondata at this time. after being turbo with the hack i don't think it would be worth the upgrade. i'm not going for a real high hp setup. just a good street setup on an ls. if you stay within the limits of the hack you will be fine. the only times i have personally seen the hack fail is when a user takes it out of its limits by runnning too much boost.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ricey McRicerton &raquo;</TD></TR><TR><TD CLASS="quote">tuning=the heart of every turbo car. If you are asking if it needs to be tuned I would suggest you either read a WHOLE bunch before you go turbo or just stay the hell away from it. A FMU cannot be tuned, and the VAFC hack isnt exactly the greatest either. Here is everything you could ever want to know about the VAFC hack.
https://honda-tech.com/zerothread?id=137901
</TD></TR></TABLE>

no, believe me I'm getting my car tuned, I'm just asking whether stock fmu would be fine or if it would be more beneficial to run the hack is all.

 

I suggest the hack..more adjustability as long as you aernt planning to run a ton of boost. The hack gets my

 

the hack is pretty good and cheap. its a no brainer in your case.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fsp31 &raquo;</TD></TR><TR><TD CLASS="quote">
A suggestion: Do the fuel stuff before you touch anything else. Get the "hack" up and running well on your NA car first. It will work just fine without a turbo... as if you're in negative boost. That way, when you do the turbo install, trouble shooting gets a lot easier.</TD></TR></TABLE>

you know i always wondered about that! thanx alot for the info....... i will get mine set up soon.

 

I gained about over 10 whp with the vafc over the greddy fmu on my sohc beater

 

so looks like general consensus is, get the DSM 440's and resistor box and run the hack. and yeah, I'd only be running 7 psi, so I'm not going crazy. I know the map can only handle like 10.65 psi w/ the hack I believe.

MAtt

 

just be careful running the hack its is known to advannce timing at part throttle boost. you should be fine if you take out some timing and even then it still advances timing.

 

i just want to be clarified on this subject...........

we are not "hacking" anything, this is the setup where you install an afc the way it should be and run the 440 or 450's............

correct or no?

 

Some ppl acutally "hack" using the TPS mod but for most its just installing the injectors and AFC like normal just turning the fuel down to about -35%. Check the link posted above for the exact info but I hope that clarifies something.

 

Just put the fuel pump , vafc, injectors and set to like 35 to 40 you know when you tune. Hack this Hack That ,just forget about it and hook it up the way it was meant to be hooked up.

 

yep, understood.........

ive read that thread multiple times but i just wanted to clarify that hooking the afc up the correct way was what this thread was about.......... in actuality the thread shouldnt have been called the "hack" in the first place

 

i've run both fmu set up and hack set up, and i like the "hack" setup about 100 times better! car runs better, boost transition is nice. that and i blew my first motor using a fmu . with the hack i run kinda rich tho, but better rich then lean

 

Quote, originally posted by fsp31 »
A suggestion: Do the fuel stuff before you touch anything else. Get the "hack" up and running well on your NA car first. It will work just fine without a turbo... as if you're in negative boost. That way, when you do the turbo install, trouble shooting gets a lot easier. &lt;&lt;

you know i always wondered about that! thanx alot for the info....... i will get mine set up soon.&lt;&lt;

Heh, no prob! I sort of hit on the idea by accident because I wanted to do my install in stages. What *really* surprised me was the fact that the car actually ran a bit better after the fuel setup change! I have no idea why, but other people noticed as well. So... if you have your fuel system set up properly, you should not lose any power, driveability, etc. at all while the car is NA.