dynoed actual advance that a v-afc puts out at 10 psi
07-30-2003, 02:41 PM
#12
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Join Date: Apr 2003
Posts: 2,260
Re:dynoed actual advance that a v-afc puts out at 10 psi
Originally Posted by Dr.Boost
Cool. Thanks for clearing that up.
For all the disbelievers,
I TOLD YOU SO!! :P
For all the disbelievers,
I TOLD YOU SO!! :P
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.
07-30-2003, 05:21 PM
#13
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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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07-30-2003, 10:57 PM
#14
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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..... 
07-31-2003, 06:27 AM
#15
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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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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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07-31-2003, 12:16 PM
#16
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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.
"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.
Originally Posted by Dr.Boost
Ask the guy that posted above you then read the last few posts in this thread
07-31-2003, 01:37 PM
#17
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Join Date: Apr 2003
Posts: 2,260
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.
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.
07-31-2003, 06:27 PM
#18
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Join Date: Dec 2002
Posts: 463
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.
07-31-2003, 07:58 PM
#19
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Join Date: Apr 2003
Posts: 2,260
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..
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..
07-31-2003, 08:09 PM
#20
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Join Date: Dec 2002
Posts: 463
Re:dynoed actual advance that a v-afc puts out at 10 psi
***....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............
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............
