The truth about the afc hack!!!!!!!
would that work to correct the timing at low boost?
04-29-2003, 11:48 AM
#22
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re:The truth about the afc hack!!!!!!!
Dr. Boost's summary about the MAP sensor being a 0 to 50 volt sensor is correct. The Honda MAP sensors are on a scale where 5 volts = 11.8 psi BUT they will never read that high. There is a diaphragm inside that stops travelling after 9.25 psi for OBD0 and 10.65 psi for OBD1/2 - they never reach the full 5 volts.
As for the ignition map situation... looky here. The pressure gradings across the top are for a naturally aspirated map, since Ghettodyne does not support my MAPhack setup. This is a stock OBD0 LS ignition map shown.
Just to give you an idea of what a stock OBD0 LS ignition map with 1.0 degree per psi retard looks like... see the difference?
As for the ignition map situation... looky here. The pressure gradings across the top are for a naturally aspirated map, since Ghettodyne does not support my MAPhack setup. This is a stock OBD0 LS ignition map shown.
Just to give you an idea of what a stock OBD0 LS ignition map with 1.0 degree per psi retard looks like... see the difference?
04-29-2003, 08:28 PM
#23
0.5 BAR
Join Date: Mar 2003
Posts: 142
Re:The truth about the afc hack!!!!!!!
Have any of you ever read this "trailer park boost" artical?
http://www.carolinahondas.com/forums...&highlight=AFC
http://www.carolinahondas.com/forums...&highlight=AFC
04-29-2003, 09:37 PM
#25
1.0 BAR
Join Date: Mar 2003
Posts: 432
Re:The truth about the afc hack!!!!!!!
Thanks for the info Joseph!!! we all appreciate it!! alright enough *** kissing...I've never used Ghettodyne and I don't understand some of the chart. Is the dark green area the safe zone or does color have nothing to do with it? do you read the columns or the rows? For instance, do you go to your desired vac/press quantity then scroll down the column to see what the timing is set at? So you're saying between 11in Hg and 1inHg is where the AFC hack falls short? Thanks man I think we're getting close to a conclusion here. Any info on the Apexi ITC helping to fix this?
04-30-2003, 12:02 PM
#28
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re:The truth about the afc hack!!!!!!!
Ghettodyne is set up for naturally aspirated use, with engine RPM down the left side and engine vacuum (pressure via MAP sensor) across the top. It does not reflect the REAL values of the columns when used with an AFC hack.
With the AFC hack: 11 in/hg becomes 0.8 psi, 9 in/hg becomes 2.4 psi, 8 in/hg becomes 3.3 psi, 4 in/hg becomes 6.5 psi, 1 in/hg becomes 9.0 psi, and 1.3 psi becomes 11.8 psi. The last column is never used in an AFC hacked vehicle due to the limitations of the MAP sensor. If you dial the fuel rich enough toward redline, you change the MAP points and can actually bring the last column into play - or exceed it, like when you kick a code 3 with the AFC because you've richened beyond what the ECU can handle (over 3 volts returned from the MAP)
As far as my sarcastic comment regarding the MAPhack black box... I built it, I can give you a dozen reasons why it's POS. Atlee's had a few problems with voltage skewing around and tune changing a bit with temp and humidity on his car, which I don't like. The alternator increases voltage slightly (13.5 v to 14.5 v usually) as you rev the engine from idle which causes a little fluctuation (towards running rich) as you step on the gas... which I don't mind... but it's proven a bit unreliable.
Really, just pick up an electronics catalog and look for "voltage regulators." The part you want is a "7803" which is a 3 volt positive voltage regulator. It has three pins and is impossible to miswire - power in, 3 volts out, and ground. It holds the MAP sensor input at a rock solid 3.0x volts.
With the AFC hack: 11 in/hg becomes 0.8 psi, 9 in/hg becomes 2.4 psi, 8 in/hg becomes 3.3 psi, 4 in/hg becomes 6.5 psi, 1 in/hg becomes 9.0 psi, and 1.3 psi becomes 11.8 psi. The last column is never used in an AFC hacked vehicle due to the limitations of the MAP sensor. If you dial the fuel rich enough toward redline, you change the MAP points and can actually bring the last column into play - or exceed it, like when you kick a code 3 with the AFC because you've richened beyond what the ECU can handle (over 3 volts returned from the MAP)
As far as my sarcastic comment regarding the MAPhack black box... I built it, I can give you a dozen reasons why it's POS. Atlee's had a few problems with voltage skewing around and tune changing a bit with temp and humidity on his car, which I don't like. The alternator increases voltage slightly (13.5 v to 14.5 v usually) as you rev the engine from idle which causes a little fluctuation (towards running rich) as you step on the gas... which I don't mind... but it's proven a bit unreliable.
Really, just pick up an electronics catalog and look for "voltage regulators." The part you want is a "7803" which is a 3 volt positive voltage regulator. It has three pins and is impossible to miswire - power in, 3 volts out, and ground. It holds the MAP sensor input at a rock solid 3.0x volts.
05-03-2003, 06:32 PM
#29
0.0 BAR
Join Date: Apr 2003
Posts: 13
Re:The truth about the afc hack!!!!!!!
I still have a doubt about timing.........
If I go extremely rich to move to the next column, my air/fuel ratio will go far above 12:1 (losing power), wont it?
Another doubt is, IF i am boosting to only 6 or 7 psi, I wont even get to the final column unless I go with a -20 setting on the vafc.........which in turn will be too rich I think.........
I am starting to build the car during this weak and I am TOTALLY FREAKED OUT! I dont wanna blow! I planned on boosting to 8 psi and retarding static ignition (and pray....)
If I go extremely rich to move to the next column, my air/fuel ratio will go far above 12:1 (losing power), wont it?
Another doubt is, IF i am boosting to only 6 or 7 psi, I wont even get to the final column unless I go with a -20 setting on the vafc.........which in turn will be too rich I think.........
I am starting to build the car during this weak and I am TOTALLY FREAKED OUT! I dont wanna blow! I planned on boosting to 8 psi and retarding static ignition (and pray....)
05-03-2003, 07:31 PM
#30
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:The truth about the afc hack!!!!!!!
I just turned my boost up today to 11 psi. I have my ignition timing almost all the way retarded. It is just perfect. Absolutely no signs of detonation and just a smooth crazy power band all the way to 11 psi. I think you are worrying too much. Although, I have heard that running between 5-6 psi with the hack is not good. If you go with 8 psi you should be fine. I beat the hell out of may car at anywhere from 8-11 psi and I haven't blown my ---- yet.*knocks on wood*.
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