WJM Posted December 10, 2007 Share Posted December 10, 2007 http://www.14point7.com/UAFC/UAFC.htm !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 Discuss. UAFC is a low cost programmable MAP or MAF voltage scaler. Product Features: * $60 for the version which works with 0-5 volts MAP and MAF sensor * $90 for the version which works with 0-10 volts MAP and MAF sensor * 255 point (16 MAP vs 16 RPM) MAP or MAF correction table * Works upto 15300 RPM * Datalogging of MAP/MAF, RPM, and 2 external voltage channels * USB connectivity UAFC is a low cost computer programmable MAP or MAF voltage scaler. It works on the same principle as other MAP/MAF voltage scaling piggyback fuel controllers. Through it's 255 point fuel correction table, 16 RPM rows vs 16 MAP/MAF columns, UAFC offers great ability to control the fueling of your engine. UAFC features USB connectivity to download fuel correction tables and datalogging. To hook up UAFC you will need to wire up the following to UAFC; 12v, ground, MAP or MAF, and RPM. To be honest, if there are low cost solutions to chip your ecu; chrome for honda, Enginuity for subarus, etc..., you should use those solutions. If those options are not available and you need a low cost and effective solution for fuel management then UAFC is a great choice. Link to comment Share on other sites More sharing options...
joostvdw Posted December 10, 2007 Share Posted December 10, 2007 Where do I order one Please, let someone try this, I don't have the money right now to spend on toys like that, but it definately sounds like a solution! And for $90, what the hell?! Link to comment Share on other sites More sharing options...
carfreak85 Posted December 10, 2007 Share Posted December 10, 2007 Sounds like a band-aid fix to me. MegaSquirt 'N' Spark FTW!!! If it didn't work for you, then you must not know that much about programming your own FI system... Link to comment Share on other sites More sharing options...
WJM Posted December 10, 2007 Author Share Posted December 10, 2007 Looks like someone is taking a cheap shot at me.... Link to comment Share on other sites More sharing options...
Reveeen Posted December 10, 2007 Share Posted December 10, 2007 The thing is a pig in a poke. There is no provision for timing adjustment, just fuel "fooling". If you wanted fuel "fooling" just use an adjustable fuel regulator. Link to comment Share on other sites More sharing options...
WJM Posted December 10, 2007 Author Share Posted December 10, 2007 If you wanted fuel "fooling" just use an adjustable fuel regulator. I tried that. No change in back to back dyno runs with AFR logging on the EA82T engine. hte purpose of the device would be if you added 550cc injectors.... Link to comment Share on other sites More sharing options...
subyrally Posted December 11, 2007 Share Posted December 11, 2007 looks like you could actually benefit from it. if you are running larger injectors and an adjustable fpr, the ecu most likely isnt going to keep up with the fueling, either running too rich or too lean, at least with with afc of some sort, you can manage the fueling of the engine. it gives you the opportunity to shorten or lengthen the injector pulses, depending on your needs. only reason i didnt have one on my rx was that no one i knew of made one that worked with the old school suby maf's. personally, i would like to run megasquirt. but for the moment, if this will help keep the engine from leaning out on me, ill take it. hey Will, thanks for posting this. ill look into it, when i get my car on the road and get the ea82t built back up, ill let you all know ohow well it works out, unless someone else beats me to it, which im sure they will cause im still poor. Link to comment Share on other sites More sharing options...
daeron Posted December 11, 2007 Share Posted December 11, 2007 it might work well for you; sounds like it can't hurt to try. You might want to try to find some sort of spark control band-aid to complement the additional fueling.. and you *might* just hit on an easy combination for simple, "bolt-on" control for a low budget EA82T tweaking. Link to comment Share on other sites More sharing options...
Subi81 Posted December 13, 2007 Share Posted December 13, 2007 I don't know about the UAFC, just not a big fan of piggy backing (thats just me though), but this sounds more scientific then the get bigger injectors and "tweak" the flapper spring. The Wideband O2 sensor setup looks pretty interesting always wanted one. If it works as good as he says you could save ~ $200. But the real question is what is NAW? Next Another Wideband? New Another Wideband I kinda like DIY electronics kits, fun to make then debug because you soldered something wrong. For $60 to $90 I say go for it!!! Let the results speak for themselves. Thanks for the link! Link to comment Share on other sites More sharing options...
PoorManzImpreza Posted December 13, 2007 Share Posted December 13, 2007 Ea81t and ea82t don't have ignition problems when boosting power, they have fuel problems..The late model ea82t ignition system is very sensitive and highly responsive to knock it is calibrated to the factory knock sensor and is self programmable pulling and advancing timing based on fuel octane and knock activity.. What ea82t have problems with is supplying enough fuel to allow increased boost and bigger turbochargers... A solution like this would allow us to successfully scale our afm signal to trick the ecu into sending the correct pulse width to drive bigger injectors correctly..Our ecu is still doing the work of actual fuel delivery and ignition spark.. What I don't know is what happens when the afm maxes out? This is what separates the men from the boys as far as AFCs are concerned..It's not like we can stick our maf sensor into a bigger tube like the later model ej boys can do when they start out flowing their MAF sensors.. We also don't know what signal level the factory ecu interprets from the afm that says cut fuel.. If we increase boost and fuel we will flow more air and there's only so much we can rescale our maf signal before the AFC is sending enough MAF voltage to cause the ecu to cut fuel....Of course we could just add another maf sensor in parallel.. Having said all that we still have the problem of how to keep our stock head gaskets in place.. But since detonation is also a factor in the head gasket failure of our engines..Maybe keeping det from happening will allow our engines to survive a bit longer until the next weakest thing lets go.. I heard a rumor that 85 to early 87 ea82ts had forged pistons..True? False? I dunno def. OT though Kaz Link to comment Share on other sites More sharing options...
joostvdw Posted December 13, 2007 Share Posted December 13, 2007 If you have a bigger AFM, its just a matter of remapping thet UAFC thingy for the new flow of air (with a wideband preferrably) and you'll be good to go Link to comment Share on other sites More sharing options...
WJM Posted December 14, 2007 Author Share Posted December 14, 2007 when you go to a larger maf housing on the stock ECU and you dont have access to the intake calibration maps...it makes it nearly impossible to make it run correctly. It would be safe to say I've got more experience in that area than anyone else on here. However, it would be EXTREMELY safe to say that on the stock VF7, or the TD04L-13G (stock WRX turbo), I dont think we have to worry about maxing out the MAF below 20 psi boost levels. However, if someone is going more and bigger...you are going to need an emanage/MS+/standalone (AEM/Hydra) anyhow. You should not be messing with the UAFC/SAFC simple stuff. My idea was for when I do get an EA82T again, stock turbo w/ported wastegate with slightly built internals, EVO injectors and the other usual bolt ons. Like PoorMansImpreza said, the 87~91 EA82T stock ignition control is absolutely AWESOME. The tiny rump roast injectors is the problem. Fuel pump and injectors, and something to scale the fuel delivery back...voila, problem solved. The one issue that arises from that is that you are putting the ECU in a lower load cell by fooling the ECU into thinking its in a lower load state....so it automatically runs more timing in the lower load states. Solution: manually retard the disty. Done. Tune fueling w/innovate wideband. Its a good idea. It works with 10v MAFs. I'm going to try it when I get another EA82T car. Link to comment Share on other sites More sharing options...
subyrally Posted December 14, 2007 Share Posted December 14, 2007 and this is why Will is the man!! not that i ever lost hope for hte ea82t, but now i know there is more of a chance to do what i want to do with mine when i get it built up. on a side note, when did you move to mt. airy? i have family in that area. Link to comment Share on other sites More sharing options...
ausubaru92 Posted December 16, 2007 Share Posted December 16, 2007 Wonder if i could get one sent to Australia? Especially with out high Aussie dollar What about RICE http://www.14point7.com/RICE/RICE.htm It has even more. Link to comment Share on other sites More sharing options...
WJM Posted December 16, 2007 Author Share Posted December 16, 2007 If I were to look into getting that...I'd just get the emanage ultimate. Link to comment Share on other sites More sharing options...
calebz Posted December 16, 2007 Share Posted December 16, 2007 Its a good idea. It works with 10v MAFs. I'm going to try it when I get another EA82T car. The 87+ EA82T uses a 5 volt maf doesn't it? Link to comment Share on other sites More sharing options...
WJM Posted December 16, 2007 Author Share Posted December 16, 2007 No...the whole reason we cant get the SAFC to work correctly is that its a 10v MAF. I was reading where SubaruTex got it working somehow...but I never found details. Link to comment Share on other sites More sharing options...
Subarutex Posted December 17, 2007 Share Posted December 17, 2007 No...the whole reason we cant get the SAFC to work correctly is that its a 10v MAF. I was reading where SubaruTex got it working somehow...but I never found details. Working? Yes. Actually functioning correctly? No. The SAFC had a very limited range it could help in (due to the 10 volt maf). Link to comment Share on other sites More sharing options...
WJM Posted December 17, 2007 Author Share Posted December 17, 2007 Working? Yes. Actually functioning correctly? No. The SAFC had a very limited range it could help in (due to the 10 volt maf). Which is what I figured but I didnt want to say anything until i got confirmation from you. thanks for the info! Link to comment Share on other sites More sharing options...
beataru Posted December 17, 2007 Share Posted December 17, 2007 That thing seems way more complicated than an SAFC. Its fairly cheap though, but I think that for the money an SAFC would be the better one if you had to depend on it. Thanks for the insight though, it makes more options out there known. Link to comment Share on other sites More sharing options...
WJM Posted December 17, 2007 Author Share Posted December 17, 2007 Again, we cannot use a SAFC. It only works with Karman, 0v to 5v MAP/MAF sensors and flapper door types. Those of us with 87~91 EA82T cars need a fuel solution for running bigger injectors on the stock ECU. Link to comment Share on other sites More sharing options...
hooziewhatsit Posted December 18, 2007 Share Posted December 18, 2007 So what is the exact problem? I might be able to whip up a widget that would work. Just need to know what it needs to do. -Dave Link to comment Share on other sites More sharing options...
WJM Posted December 18, 2007 Author Share Posted December 18, 2007 the problem is making the safc work with the 0-10v maf properly. Link to comment Share on other sites More sharing options...
beataru Posted December 18, 2007 Share Posted December 18, 2007 Im still at a miss as to why we cant just slap on a ej series MAF sensor and go from there. Link to comment Share on other sites More sharing options...
WJM Posted December 18, 2007 Author Share Posted December 18, 2007 Because the ECU operates on the 0-10v range...so does the MAF. if you install an EJ MAF, the ECU is confused and the car will not run. EJ MAF is 0-5v. I've done this before. It doesnt work. You cant just swap MAF of different types and diameters and expect it to work. Link to comment Share on other sites More sharing options...
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