dynoed actual advance that a v-afc puts out at 10 psi
 

on a dyno with the afc hack with 10 psi on a d16z6 (stock) 450cc stock map no missing link check valve etc. is 7.2 deg advanced just found that out today hope this solves the drama behind this subject lol

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Cool. Thanks for clearing that up.

For all the disbelievers,

I TOLD YOU SO!! :P
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Re:dynoed actual advance that a v-afc puts out at 10 psi
 

So the AFC hack does advance the timing a bit!?! So you might just wanna knock it down at the dizzy, right?? Good, info, a lot of people needed to hear that cuz there was so much this and that about the AFC hack.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

thats good to know, 7.2 IS NOT OFF THE CHARTS like other peeps use the say. so did u leave it like that or what ? oh and what settings did u finaly settle on? what where your dyno numbers at 10psi?

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Doesn't this show that the J. Davis boost chip that retards 1 degree for each pound of boost would work great?

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

1degree is too much. i was runing like that with the ghettodyne and it was wack. if your car can handle the 7-8 degrees advance without detonation then leave it. youll be makeing more power. you only need to retard if your having problems with pinging. ;)

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

but how much timing advance at 1-9 psi?? give results!!!

i heard only gives high advance near no or low boost?

give results, i know i gotta turn my dizzy, but most i'll go is 4 degrees retard

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Damn, well I have three options, right now I have an automatic PR3 ecu so it fuel cuts at 7600rpm's and has a speed limit which pisses me off. So I can either:

A) Use the J. Davis chip that I have even though 1 degree retard per pound of boost is too much, maybe advance the base timing 2 degrees?.

B) Find a stock program to get chipped, set my timing at about 2 degrees retarded and run 93 octane possibly being fine.

or

C) Use my nasty automatic chip, set timing at 2 degrees retarded, and never feel what it's like to run higher than 7600RPMs and faster than 113mph.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Is that J. Davis chip one of the ones you can reburn? If 1 degree of retard per pound of boost is too much then reburn the chip for .5 degree of retard per pound of boost or around there.

I thought I read the afc advances your timing more at low boost as well. Like 7 psi and under.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

sorry guys should of cleared taht up the peak is 7.2 deg advanced at roughly 5-6 psi the starts dropping dramatically to almost no change at 10 psi about.8 and th9is want my dyno it was my boys and i actually was there and seen everything so its not fake the numbers where 215.1 hp and 161.6 lb torque so if your looking for 9-10 psi then go with the afc hack if not thenuse other fuel management cuase it can hurt you if your not carefull and hopefully soon ill get the graphs to post them for you guys

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

almost no change at 10psi? very nice. and wow u got some great numbers too on your dyno. congrats ;D

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Why would people not believe? Lack of understanding? It's a simple concept. Your tricking your ECU into thinking you're at less pressure than you actually are. If you look at the flow of an ignition map, you're advanced down low, and you retard are you get to higher pressures right?

Well, lets say, you're at 3000rpm @ 10inHg. This would normally yield you ~27-30 degrees advanced on a stock PM6 map. Now, at that SAME RPM and pressure, depending on how much you're leaned out, your MAP sensor signal is scaled down with a V-AFC. Meaning less voltage (which dictates pressure) is getting to your ECU from your MAP sensor. So you could be anywhere from ~33-37 degrees advanced at the same physical pressure, and rpm!

Another side note, depending on how much you've scaled, you map not even be using your entire map. So, tuning for open loop would be difficult to say the least.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Ask the guy that posted above you then read the last few posts in this thread https://www.homemadeturbo.com/forum/...;threadid=4383. ;)
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Re:dynoed actual advance that a v-afc puts out at 10 psi
 

oh there u go again starting this. i never said it didnt advance the timing. i said it didnt advance the timing so much that people have to worry about boosting 5-6 psi. dam what dont u get.its not my fault u cant tune your afc for 5-6 psi mang. dont get everyone else paranoid about it either.thats it mang say what ever u want now im outs gona go boosting..... ;D

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Uhhhh...your exact words:
i dont know who comes up with this stuff mang. take it form a guy that has used the afc in low boost and higher boost(12psi). it doesnt advance yout timing

You didn't know what you were talking about and you still don't. The timing at 5-6 psi is the worst, just like I said. Did you read what you wrote in that thread? When did I say I can't tune my AFC? Where are you coming up with this stuff? Get your story straight man. How is INFORMING someone of a timing advance making them paranoid? I would think that not informing them and giving them false information as you have done would be way more harmful.

BTW I wasn't the one who started this up in the last thread. :P
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Re:dynoed actual advance that a v-afc puts out at 10 psi
 

if your going to quote me drboost, y dont you at least put the entire quote,dont just try to make me look bad.

"i dont know who comes up with this stuff mang. take it form a guy that has used the afc in low boost and higher boost(12psi). it doesnt advance yout timing, not so much that it will cause detonation.im currenty runing 10 psi on stock timing. thats how well it works. if ;you do experience detonation, add more fuel with the afc and bam problem solved.(thanks 91accordlx for the tip) AFC! AFC! AFC! Using the afc and 450cc injectors maybe a new fuel pump and youll be set. the afc really is not complicated at all. "

with PROPER tuning of the afc you wont detonate at 5-6 psi. and snatch10psi said it only advance timing 7.2 degrees at 5-6psi.not the 33-37 that turboef9 said. so explain that to me. really id like to know how u got those numbers? i understand your reasoning turboef9 but then y did snatch10psi only get 7.2 degrees advanced?

and yes u did start this up again.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Well, if we're going into the "I heard that if you.." and the "My friend of a friend of a friend once heard a guy who.." vault of knowledge, I personally run 10psi with my V-AFC. I also have my ignition timing set at the stock 16degrees advanced, run 92 octane gas, and have no detenation.

Detenation variables (heat, air content, fuel, gas quality, so forth..) are going to be different per region. Someone in Arizona could ping at 6psi due to the heat in the summer, while somone here in Kansas City would need 12psi to ping with the same engine setup. It's all different.

The only fact that remains is, yes, the AFC, or any MAP signal modification device, does indeed, indirectly advance ignition timing.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Okay fellas, I'm little confused here.... So if I retard my base timing say..... 1 degrees. and boosting 8 psi on the hack, would it hurt? I do understand the variables of detonation. I just want to know if that would be safe, considering that we base our findings on the 10 psi= +7.2 degrees. I live in Va in it gets really humid and hot from time to time. I just want to be able to understand the concept in which how a base timing (retarded) can affect the whole "hack" ordeal. Thank you for your time.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

Ya, retarding your base ignition timing is really (besides hacking your ignition maps, which would be difficult do to the scaling process) the only way to help out, less getting a boost timing master.

The downside to retarding your base ignition timing is, of course, you lose low RPM power, especially since you're trying to spool a turbo. Sort of a trade of, really..

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

fuk....that trade off sux. I read this post too: https://www.homemadeturbo.com/forum/...;threadid=7925
Now, ---- is really ------- my brains up. There are so many options out there. I think I'm gonna get a BTM and mess around with it. I'm scheduled to dyno in the next few weeks............

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

16 degrees base timing + 7 degrees advance = 23 degrees final timing at 10 psi with AFC hack. Sounds about right, that's where your stock NA WOT timing is supposed to be for the usual SOHC.

Now turn the boost down to 3 psi and take a dyno pull. NOW you see what I mean:

16 degrees base + 22 degrees advance = 38 degrees final for SOHC, add another 6-8 degrees to those figures for B-series or ZC. When you take into account that the DOHC VTEC engines run ~44 degrees at part throttle (now low boost with VAFC hack) and taper to 20-22 degrees at NA WOT due to their high CR nature, then the disparity of low boost to high boost timing is revealed.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

J_D, educate me man. What is the stock timing set at on SOHC VTEC? I understand the you said 16 degrees base timing. I'm assuming that you've already added the needed retardation from stock set-point. The problem I have is, I do not know the stock set-point. Thanks J_D. U da man!

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

i was talking to a few people and considering it myself a apexi ITC is another good option cause you can advance your timing on the bottom end and retard it when boosting but there in lies the problem fellas its the same concept of the afc hack you retard your timing youll add more fuel advacne will lean it out so it will take some seroius mind boggling to get the right combonation but it will solve all those problems with low rpm lag ill try it out then let you all now oh and another thing u guys had alot of arguing about my post look its dynoed the truth not a theroy so that part is true and 7.2 is not alot at all and if you got everything right you can run without detonation oh and the dyno was in VA and it was hot and humid so it all depends where you are at and if there are any other ?'s for me just let me know sorry bout the long post

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

thermal- the Y8 and Y7 both start out at 12 degrees BTDC ....I just looked it up at work to verify. The DOHC engines start at 16 degrees BTDC I've been asking about the AFC ITC since the old AFC HACK post but no one really has any experience with it seems like it would have some drawbacks as it would change something else along with the timing.

Re:dynoed actual advance that a v-afc puts out at 10 psi
 

thanks bro......