dynoed actual advance that a v-afc puts out at 10 psi
08-01-2003, 01:30 PM
#21
0.0 BAR
Join Date: Feb 2003
Posts: 0
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.
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.
08-01-2003, 06:42 PM
#22
1.0 BAR
Join Date: Dec 2002
Posts: 463
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!
08-01-2003, 10:26 PM
#23
1.0 BAR
Thread Starter
Join Date: Jul 2003
Posts: 238
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
08-30-2003, 06:18 AM
#24
1.0 BAR
Join Date: Mar 2003
Posts: 432
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.
08-30-2003, 01:30 PM
#25
1.0 BAR
Join Date: Dec 2002
Posts: 463
Re:dynoed actual advance that a v-afc puts out at 10 psi
Originally Posted by 2000psi
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.
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