how do audis (particularly the 1.8t b5 a4) react to apexi safc piggie back fuel computers? has anyone here tried one? does anyone have any good data on wether or not they will work? if these work we should be able to open up new options for boost and engine control. thanks

yeah they work. but there a pain in the ass. if youve used one before than you know how to use it. If you want i have one that has never been used its black and its the S-afc II. ill sell it to you for $250 and that includes shipping

is that the older safc II or the brand new one(some people confuse the two)? if its the older one then nah, i can usually fine em used in good shape for pretty cheap locally, people upgrade to the new one. so is it just using one that is a pain in the ass or os there more to it? cause i am pretty proficient in using them, i used that and my wideband o2 to get pretty flat 12.0:1 afr across the board on large(450cc) injectors. i really think that if these systems work with the audi ecu well that this could open up a great alternative route to buying the overpriced crap chips. that and a boost controller might be all you'll need, maybe an adjustable fpr too. hell even for turbo upgrades you could avoid buying a chip. and still save money, plus you'll actually be able to tune the system.

Hey guys. I'm really interested in this. i gotz an AEB a4. Are there any other controllers that will work that have more tunability or is the safc good enough??? also what other mods other than turbo, mani, dp ,, will i need with this
THanks
Peace

its the brand new S-afc II with the black casing red backlight and white letters. i chose this b/c it would match the rest of the interior lights but got too lazy to replace the old safc.

The S-afc is the best way to go. and if your going electronic boost controller the Greddy Profec-B is the way to go. Its simple you have 3 knobs one for high boost one for low boost and one that determines how fast the turbo spools

cool, i dunno if ill buy yours, i still got an old one on my civic too! so it sounds like this system would work, i got some bills to pay(damn hospital) but after those depending on the cash i got left i will give it a try, i already got a wideband o2 so i can tune nice and safe. i will let ya guys know if i ever get this project up and running.

Dude why not spend the extra buck and get some software where from someone. Do you realize that it will be much more reliable with software. With a boost controller your only gaining boost, no air/fuel adjustments, no timing. Its retarded not u, dont take my word for it that. I gota remember this is the guy who told us bovs work wonderful on stock A4s.:eek:

Thin ice, thin ice.

lol whatever, thats why i am researching the use of an apexi safc, let me give you the non abbriviated term apexi Super Air Fuel Controller, in other words with this i can change the fuel mixtures so that the car will run the same as or better than stock(oh with the aid of my wideband o2 sensor). i am adressing both fuel AND boost issues here, i know not to just turn up the boost on these cars. oh i remember a certain someone that might have thought the higher elevation you are at the better your car runs. can't remeber who though. lol.

maybe its super air flow controller, lol can't remember but anyways i can control all fuel settings for the car for upped boost and even adjust for bigger injectors, just have to know how and have the proper tuning tools(wideband)

and just so you know a wideband o2 sensor is the most accurate(much more than stock) way of reading of how rich or lean your engine is running, its a seperate system from the ecu, and uses a seperate wideband oxygen sensor.

he knows ive already explained it. dont even bother you cant win this battle becuase you are wrong. dont mess with user definable tools and go with a chip

lol whatever, thats why i am researching the use of an apexi safc, let me give you the non abbriviated term apexi Super Air Fuel Controller, in other words with this i can change the fuel mixtures so that the car will run the same as or better than stock(oh with the aid of my wideband o2 sensor). i am adressing both fuel AND boost issues here, i know not to just turn up the boost on these cars. oh i remember a certain someone that might have thought the higher elevation you are at the better your car runs. can't remeber who though. lol.

maybe its super air flow controller, lol can't remember but anyways i can control all fuel settings for the car for upped boost and even adjust for bigger injectors, just have to know how and have the proper tuning tools(wideband)

and just so you know a wideband o2 sensor is the most accurate(much more than stock) way of reading of how rich or lean your engine is running, its a seperate system from the ecu, and uses a seperate wideband oxygen sensor."




Ok, dude all im saying is why not spend like 500bucks for a chip which contols everything, timing,boost, and air fuel. And then run a boost controoler on top of that. If your this smart then go ahead and do it. But I think dave was running stuff similiar to that and his engine blew. Not because of his fault but because of fuel shortage. A chip would have taken care of that.

no a better fuel pump connection would have fixed that. it shorted out and cut fuel.

im not even talking about runing a chip at all, with a boost controller, fuel computer, and even a boost dependant ignition retard system you would have all the reliability you would get with a chip, as your still using the stock chip just giving it extra of what it needs when it needs it.

dave, what do you think of the HKS boost controller(the nicer one), i think it has the ability to "learn" your turbos flow characteristics and adjust wastgate operations to allow for better spool time, im not sure of this though. does the profec do this(looks like it might), also were you running anything to control ignition timing? like a retardation system of sorts? msd has some systems out that depending on boost levels you can adjust ignition, ill look into them some more.

i figure it this way;

apexi safc(2ng gen silver, blue gauges) $150-$200(maybe less now)
Profec or similar boost controller $200-300
Boost ignition retard iv seen easy ones for about $75 up to $300 for fully programmable spark, ignition, and other cool stuff.

so with that list you should be able to control all vital aspects of your engine, increase boost, adjust for varried sized injectors, and fine tune to produce more power, but this is really for someone who likes to be in control, i don't like computers dictating EVERY setting and not allowing me to alter them. this could work if someone wants to try, but its all preference, its about the same cost as a chip with much more upgradability options, and you have control.

in the end i will probibly just go with a giac chip because i want more power but mainly this car is not supposed to be a project, its a daily drive to get me from one place to another, a wire comes loose and the whole system has the potential to cause some damage to my car, not with a chip however(well its waranteed then). so yeah i think im probibly going to go do a chip since i need this car and im not building a car with the intentions of max power, just a little more fun to drive.

if anyone wants to try this setup out i would be more than willing to help, i know it will work, i know i could tune it very well, and i know it would gain you more power, so if anyone wants to try the send me a pm and i will surely help.

nope. just get a chip. its less expensive and 100000000000 times more reliable.

haha you start out your post like this....

"im not even talking about runing a chip at all"



and end like this....


"in the end i will probibly just go with a giac chip"



:eek:

yeah, i realized i need a reliable car and not another race car for a change, lol i convinced myself to go to a chip. gotta pay some bills first, then its boost gauge, 710n, chip, ecs n75; in that order, oh maybe an exhuast in there somewhere.

Why arent you running a bov??, you said they work well.

they do.

i know, on certain setups. I want to run one but i think im gona do some other stuff first.

Okay lets get something straight. BOV's do not make your car run rich under wot. They do once you shift. Its because they fall after the Mass air sensor and the reading the sensor gives is incorrect. They do not affect driving around, only under deceleartion aka "decel fuel cut."

Secondly, a chip is good for cars with stock turbos and bolt on mods. You upgrade that turbo, change the fuel pump, injectors, etc, your 93 octane revo chip is not going to perform right. Chips work good with limited mods, but you need user definable parameters when you start getting into big mods. Hence the afc. Thats what our friend above was getting at.

That said I think the afc is a piece of garbage. If you are going to go that route (user definable settings) and you have spent the money on a new turbo, injectors, etc then man up and buy a stand alone. I would not want to spend all that money on mods and then trust a piggy back system to control everything. Especially with obd2 computers...they tend to learn and try to correct to stock. Its basically pulling a pin on a grenade and having no idea how long the fuse is...

Im aware that some mfg'ers of turbo upgrades offer software. That is all well and good. I still would not trust anyone to my tuning needs when it comes to upgarded turbos. The average chip will not cover everything you need when you start getting into serious mods or worse yet engine work...but I will not even go there.

i have a ApexI AFC select and a manual boost controller on my car with my set up and it works great. no problems and my a/f is great dont run too rich or lean

Jeff,
Glad its working well for you. I never wish poor luck on anyone no matter what they chooese. That said let me ask/warn against this. Im not sure how audi ecu's are, but I know the honda (and a number of other mfg'ers) have obd II ecu's that attempt to correct to stock. Over time they will "un-do" your settings. The way around that is to reset the ecu everytime you turn the car off. In other words setup the ignition to reset the ecu with every start. Again, I am not sure if this will work on an audi ecu, but it may be something to investigate.

Im curious about your setup though. Do you have aim? Do you mind me picking your brain a little?

Thanks/Good luck,
Mark

yes i have aim its climbhighh. i just got a new ecu chip. it is a modified ko4 chip from apr. they had to change the boost settings around and mess with the fuel. the chip has a cool feature i can hook it up to a lap top and change some of the settings from there if needed. i will still be able to run the afc to make more precise changes along with the boost controller. if i run into any problems i can disconnect the afc and just run off the chip