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Re:The truth about the afc hack!!!!!!!
I said that assuming that you do not have a built engine as %90 of us here don't, especially if you're using the AFC hack. These little honda engines were not designed for boost and don't have the cooling to deal with the extra heat for very long. Purpose built turbo engines have larger oil galleys and better coolant flow to deal with the extra heat. 15 seconds is a long time to be at full throttle anyways.
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Re:The truth about the afc hack!!!!!!!
Originally Posted by Chacko
I don't know if this was already mentioned in this thread or not. But another problem with the Hondas and boost is simply that unless your routing your blow off air back into the charge piping before the turbo, youre MAP sensor has told the ECU to expect X amount of pressure in front of the T-body but this pressure is suddenly gone.
Anyone else have those really f*d up idles where the meter bounces around? Well hey this is most likely your culprit. Its true that proper tuning can prevent this, and any ECU thats designed to know that when you hit vacuum in the engine after going into boost, can ignore the old MAP reading. Anyways, this is just an idea of what may be causing those erratic idles and another reason why the AFC hack isn't the best way to go necessarily. |
Re:The truth about the afc hack!!!!!!!
Shadowrex, I believe the only way to fix it is to either make the MAP signal dropped (and you probably can't do this with GD) after vacuum is detected again or to run really rich/lean at the idle RPM.
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Re:The truth about the afc hack!!!!!!!
do most of you have your low and high throtle set the same on you afc or do you mix it up(if you know what i mean)
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Re:The truth about the afc hack!!!!!!!
I am currently running 5-8 psi daily (5 in small gears, 8 in bigger). I've set the AFC in lo to -40% all the way across and -38% at hi all the way across.
My TH-Point is at 11-12%, I have stopped pinging under low acceleration after I lowered the TH-POINT |
Re:The truth about the afc hack!!!!!!!
so many opinions...
so confused. someone correct me.... parts needed: 450cc ingectors resistor box s-afc *normal safc wiring? *new fuel pump? *fpr? --------------------- this is good for 10 psi, yes? can someone list ALL settings on the afc for use in this? sorry about the point form but I want it plain and simple, no "well you could... OR you could..." |
Re:The truth about the afc hack!!!!!!!
Uhm, speed density knows instantly that conditions in the intake manifold have changed, and modify the fuel accordingly in a timely fashion. It is MAF systems that go rich for a second when the throttle closes and the BOV goes off, IF the BOV is vented to atmosphere instead of before-turbo-after-MAF meter.
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Re:The truth about the afc hack!!!!!!!
Originally Posted by Dr.Boost
I'll explain this as good as I can. Since you said you were planning on running 10 psi and you are getting 450cc DSM injectors and plan on running the S-AFC, you will be fine. You would be running the same setup I have and it works great. You will not need a missing link. The missing link is basicaly a one way valve that mounts inbetween the map sensor and the throttle body. It prevents the map sensor from seeing boost and setting off the cel(check engine light). Lets say the map sensor normaly reads voltage from .50 volts-5.0 volts on a naturally aspirated engine. .50 volts being at idle and 5.0 volts being wide open throttle. When you add boost to the intake, the map sensor will be getting lets say 1.0 volts per pound of boost. The ecu sees the voltage as being too high and sends a cel. With the AFC hack you are taking the signal from the map sensor and lowering the voltage to compensate for the large injectors which in turn tricks the ecu into thinking it is supplying the stock injectors with the proper ammount of fuel. Therefore your ecu will not sence boost because the voltage has been "hacked" to fool the ecu into thinking everything is ok.
Can this be done by putting a compasitor or resistor between the map sensor and the ecu.. |
Re:The truth about the afc hack!!!!!!!
Originally Posted by tgreaves
Can this be done by putting a compasitor or resistor between the map sensor and the ecu..
Don't post crap to this thread. That is far from correct. |
Re:The truth about the afc hack!!!!!!!
It was a simple question.. A "NO" would have been better..
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Re:The truth about the afc hack!!!!!!!
for those of you that haven't, you might wanna read this post dealing with afc and timing
https://www.homemadeturbo.com/forum/...;threadid=8210 |
Re:The truth about the afc hack!!!!!!!
Originally Posted by tgreaves
It was a simple question.. A "NO" would have been better..
Bro, I apologise. It was late at night, and I misread what you were saying.... I remember at the time thinking you stated it could be done that way, not that you were asking a question. I'm feeling pretty stupid about it right now, you did not merit the reaction you got from me. To give general reasons why it wouldn't work, a fixed rate resistor put in series with a varying value potentiometer (the MAP sensor) will skew the signal instead of manipulating it in a linear manner. Depending on the MAP resistance, a proportionally larger or smaller than needed amount of load would be dropped across the fixed value resistor. A capacitor is going to charge up and then maintain a steady level of voltage flow, in a DC situation. You want the ECU to be able to see the MAP voltage as it changes, not having it's response thrown off. |
Re:The truth about the afc hack!!!!!!!
i jus wanted to add cuz i dont know if this was stated or not. and i remember someone askin. you dont wanna use a missing link cuz it wont let the afc do it's "hackin." and no fmu or fpr is needed. also, if anyone wants to boost higher then 11-12 psi. a 2bar or 3bar map sensor will let you do that. the honda oem map sensor usually maxes out at 12psi on most cars. sorry if i've repeated any info which has already been said.
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Re:The truth about the afc hack!!!!!!!
how was ur idle b4 the hack? have u tried adjusting ur idle screw...
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Re:The truth about the afc hack!!!!!!!
Originally Posted by 88 Turbo Crx
how was ur idle b4 the hack? have u tried adjusting ur idle screw...
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Re:The truth about the afc hack!!!!!!!
I have a quick question to ask too. Most of the guys on the board are running DSM 450cc injectors, but is it possible to use any other 450cc's such as RC? And will I be able to use the same settings as the other guys using Dsms.
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Re:The truth about the afc hack!!!!!!!
Yep, no problem. The only thing is you won't have to use a resistor box.
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Re:The truth about the afc hack!!!!!!!
ive spent 2 days reading the garbage in this thread. UUGGHH is the genral gearhead populations really this underinfromed ? uugghh. i was gonna wiegh on on this but i will prefer to sit back and let joseph eat you alive instead.
the issue isnt can but should you. Yes you can use the Vafc hack. Should you NO. if you cant figre out the freeware stuff get a hodnata or a Zdyne and find somebody competent to tune it for you. I could realy dive into this Today and Joseph knows i could bury you with pages and pages and pages of S/d thoery until your eyes buged out of your heads. but bascially i wont. Dont use the stinky cheese VAFC. its like Playing a $5000 PRS guitar with a ------- sledgehammer. Thats all i have to say. |
Re:The truth about the afc hack!!!!!!!
And I'm going to have to disagree.
The honda ECUs do linear interpolation. They have either a 15x17 or 20x10 VE table, which even you admit is overkill for most situations. With linear interpolation... This site isn't about building a 9 second turbo car with the budget of a race team. This site is about cheap, DIY solutions that work. Unfortunately, I have to say the MAP-hacks work 10x better than a FMU, and when combined with a chipped ECU can be truly fearsome. It works, and works well. That's all I have to say about that, I guess. |
Re:The truth about the afc hack!!!!!!!
on the MAP hack working better then a FMU is absolutely agree. Big budget over here are nut house racing What budget were scrapping change to buy a new turbo
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Re:The truth about the afc hack!!!!!!!
I have read this whole post and have learned some new stuff which explains some good points. I am running this setup on my built/turboed D16A1 (brown top)I run my afc at these settings
lo 1000= -30% 2-8k= -40% Hi 1k-8k= -40% Idles @750rpm w/22in vaccum I have a slight advantage with vaccum/mecanical advance as far as the AFC goes. Now my question is this since my honda map sensor will only read 9.2psi, is there a way for me to use this hack with a different map sensor without having to go to an independant FMS?? Thanks for all the helpfull info Joseph. Cj |
Re:The truth about the afc hack!!!!!!!
Originally Posted by sean88accord
ive spent 2 days reading the garbage in this thread. UUGGHH is the genral gearhead populations really this underinfromed ? uugghh. i was gonna wiegh on on this but i will prefer to sit back and let joseph eat you alive instead.
the issue isnt can but should you. Yes you can use the Vafc hack. Should you NO. if you cant figre out the freeware stuff get a hodnata or a Zdyne and find somebody competent to tune it for you. I could realy dive into this Today and Joseph knows i could bury you with pages and pages and pages of S/d thoery until your eyes buged out of your heads. but bascially i wont. Dont use the stinky cheese VAFC. its like Playing a $5000 PRS guitar with a ------- sledgehammer. Thats all i have to say. |
Re:The truth about the afc hack!!!!!!!
Originally Posted by sean88accord
ive spent 2 days reading the garbage in this thread. UUGGHH is the genral gearhead populations really this underinfromed ? uugghh. i was gonna wiegh on on this but i will prefer to sit back and let joseph eat you alive instead.
the issue isnt can but should you. Yes you can use the Vafc hack. Should you NO. if you cant figre out the freeware stuff get a hodnata or a Zdyne and find somebody competent to tune it for you. I could realy dive into this Today and Joseph knows i could bury you with pages and pages and pages of S/d thoery until your eyes buged out of your heads. but bascially i wont. Dont use the stinky cheese VAFC. its like Playing a $5000 PRS guitar with a ------- sledgehammer. Thats all i have to say. __________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
Re:The truth about the afc hack!!!!!!!
;Di concur ;D
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Re:The truth about the afc hack!!!!!!!
we like to build our cars without spending $10,000 and without rediculous nonsense theory and astronomical physics combined with propulsion. Get a ------- clue already. that was good, dr. boost. LOL ;D, i dont know where id be without astronomical physics. do you think ill ever hit 12's without it? ;D |
Re:The truth about the afc hack!!!!!!!
Hey guys, Im planning on doin the SAfc hack on my ls, but I have a remote car starter and Im wondering if the Vafc/Safc will kick in when i remote start it.
Thanks |
Re:The truth about the afc hack!!!!!!!
Originally Posted by blackdc
Hey guys, Im planning on doin the SAfc hack on my ls, but I have a remote car starter and Im wondering if the Vafc/Safc will kick in when i remote start it.
Thanks |
Re:The truth about the afc hack!!!!!!!
I don't have my head stuffed up my ass? You will have to show my pictures before I believe you, Justin. ;D
Sean is a good dude who's forgotten what it's like to start off learning and asking the "stupid" questions. By this point in this thread that has stretched a couple months, some of the posters of such questions have either revealed themselves as total morons or have gotten past their n00b state and started to grasp the concepts very well. Makes me proud. Sean's car is also a zero-bling junkyard turbo setup; I don't think he was advocating spending a million dollars on a setup so much as he was recommending a good total engine management solution for some of the people who can't catch onto the theory required to properly do the DIY stuff. Face facts, some people are better off buying a fluent product like Hondata and taking it to an experienced Hondata tuner and enjoying a nice reliable setup instead of blowing engines trying to learn. Oh, and Sean? I have a new transmission, ACT 4 puck, tubular SS mani, and Holset HX35... you're going to have to step up the pace on that Accord if you want to hang with me. ;) |
Re:The truth about the afc hack!!!!!!!
hmm you never know what spring wil bring. ill be wiating.
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Re:The truth about the afc hack!!!!!!!
ok ive been reading this and have a fewquestions of my own the afc hack advances ur timing under boost so if u use a btm will it couner act that,this sounds stupid but what does the hack do to advance ur timing like what signal or voltage is sent where to do this u know what im sayin? :-[
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Re:The truth about the afc hack!!!!!!!
https://www.homemadeturbo.com/forum/...;threadid=4289 ahh there we goso after reading this .....it sounds like by retarding ur timing at the dizzy u will be fine just loosing some low end power, from what i gather using a btm with a afc is a waist and wont work? i dont see why,josephexplained it but none of it stuck in my brain is there any other way of explaining this
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Re:The truth about the afc hack!!!!!!!
I was getting some hesitation above 4500 RPM which I think is caused by my spark plugs.
Anyway, I was sick of getting the code 13 (barometric press) on my OBD2 set-up D16y8 VAFC DSM 450cc/resistor box. I decided to go ahead and try a conversion to P28 OBD1. The difference is amazing! It pulls harder. However my stock idle is acting up. I tried both enriching it all the way to -20% to leaning it to -42% at both Hi-Lo Wide and Narrow at 1000-4000 RPM but I still could not get it right. Any suggestions? |
Re:The truth about the afc hack!!!!!!!
Maybe you have a seperate problem. Check the IACV. :-\
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Re:The truth about the afc hack!!!!!!!
It wasnt doing it before with the OBD2 ECU. I did the conversion in a matter of minutes. I had to drive to my friend's house to pick up the ECU and did the conversion before I left his house. The car was idling fine with the OBD2 ECU. I may have to plug the OBD2 again to continue troubleshooting. I have another OBD1 ECU as well, I will try that too......
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Re:The truth about the afc hack!!!!!!!
Fixed! I changed the setting to -25% on the low cam at the 1000 RPM range. I also changed my toasted spark plugs. Idles normal again.....
BTW: OBD1 P28 makes such a whole lot of a difference on this mod. My cars pulls harder than ever! |
Re:The truth about the afc hack!!!!!!!
Does it sound like its going to stall when it idles then picks back up?
if so your running to rich at idle causing it to bog, same thing happen to me. |
Re:The truth about the afc hack!!!!!!!
Originally Posted by illusionsir
Does it sound like its going to stall when it idles then picks back up?
if so your running to rich at idle causing it to bog, same thing happen to me. |
Re:The truth about the afc hack!!!!!!!
Spent the whole week reading through all the topics and I have a clear view at the possible boost options. I prefer the AFC-hack. I'm ordering my turbo stuff tomorrow, will or will not my setup work well?
B16, stock compression T3/T4 super 60 tial wastegate @ 8 psi KN filter 680x117x74mm Forge intercooler BOV 2 degree colder plugs retarded timing (~4 degrees) Walbro 255 pump FPR 370 or 450cc peak hold injectors resistor box (stock) V-AFC New preheated lambda's all the nesseary gauges Is a BTM nessesary? |
Re:The truth about the afc hack!!!!!!!
The BTM is not necessary but it will surely help you out for ease of timing adjustablilty once you start tuning your set-up.... the list looks good. Where are you buying your turbo?
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Re:The truth about the afc hack!!!!!!!
The BTM is not necessary but it will surely help you out for ease of timing adjustablilty once you start tuning your set-up.... the list looks good. Where are you buying your turbo? Why ..can you supply me cheaper? ;) It's a t3/t4 with .57 compressor wheel and .50 compressor .63 turbine , should boost at ~3500rpm I'm also still looking for injectors, RC doesn't sell 450 peak/hold :( |
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