VAFC and tunning help.
06-10-2003, 10:57 PM
#1
Thread Starter
Join Date: Dec 2001
Location: up yours
Posts: 1,880
Likes: 0
Received 0 Likes
on
0 Posts
VAFC and tunning help.
I will heading to the dyno this weekend and hopefully Austin will give me a hand tunning the VAFC, but just in case he doesnt have time I just wanted some advice as to how the settings are tuned and what not.
1) To change the vtec point, the VAFC has a L-->H and a H-->L setting. I understand that L-->H is when the low cam switches to the high cam but how do you know where to set the H-->L?? I thought it would be at the same setting as whe the low cam switched to the high cam??
2)Hi<<L and Lo<<H??? when the ECU and the VAFC vtec differ...the % changes....can someone explain this?
I dont know...im pretty confused about the instructions...I guess to a mere mortal like me it was just never meant to be....
Anyway, any help would be greatly appreciated!!!
1) To change the vtec point, the VAFC has a L-->H and a H-->L setting. I understand that L-->H is when the low cam switches to the high cam but how do you know where to set the H-->L?? I thought it would be at the same setting as whe the low cam switched to the high cam??
2)Hi<<L and Lo<<H??? when the ECU and the VAFC vtec differ...the % changes....can someone explain this?
I dont know...im pretty confused about the instructions...I guess to a mere mortal like me it was just never meant to be....
Anyway, any help would be greatly appreciated!!!
06-10-2003, 11:40 PM
#3
Thread Starter
Join Date: Dec 2001
Location: up yours
Posts: 1,880
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (jdmspoonitr)
Why 200 though???...im just trying to understand it....any more help...what about the other things.....
I really wantde to address the A/F and the way the VAFC can lean the fuel. I really want to understand how that is achieved through the VAFC. The instructions might as well be in Russsian. I just dont get it by reading the instructions...
I really wantde to address the A/F and the way the VAFC can lean the fuel. I really want to understand how that is achieved through the VAFC. The instructions might as well be in Russsian. I just dont get it by reading the instructions...
06-11-2003, 12:14 AM
#4
Join Date: Apr 2002
Location: O.C., CA, USA
Posts: 1,248
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (Art Vandeleigh)
No real reason for the "200 RPM rule", it has nothing to do with what comes out on the dyno. Just if you want a little room for falling back down off the big lobes.
After looking at your baseline dyno and A/F chart then you can decide where you want to put the 8 fuel adjustment points. After that all you do move to each of your points on the fuel adjustment graph and add/subtract fuel. How mine ended up, my VTEC point was moved to 5000 RPM, fuel was increased from 5000-5700 RPM, then gradually leaned out afterwards up to redline.
If you just play with it for a bit you'll start to understand how the interface works. Pretty simple once you figure it out. Good luck.
After looking at your baseline dyno and A/F chart then you can decide where you want to put the 8 fuel adjustment points. After that all you do move to each of your points on the fuel adjustment graph and add/subtract fuel. How mine ended up, my VTEC point was moved to 5000 RPM, fuel was increased from 5000-5700 RPM, then gradually leaned out afterwards up to redline.
If you just play with it for a bit you'll start to understand how the interface works. Pretty simple once you figure it out. Good luck.
06-11-2003, 12:27 AM
#5
Thread Starter
Join Date: Dec 2001
Location: up yours
Posts: 1,880
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (SurferX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SurferX »</TD></TR><TR><TD CLASS="quote">After looking at your baseline dyno and A/F chart then you can decide where you want to put the 8 fuel adjustment points. After that all you do move to each of your points on the fuel adjustment graph and add/subtract fuel. How mine ended up, my VTEC point was moved to 5000 RPM, fuel was increased from 5000-5700 RPM, then gradually leaned out afterwards up to redline.
</TD></TR></TABLE>
so is this the "ne point" ? or is that something else...
</TD></TR></TABLE>
so is this the "ne point" ? or is that something else...
06-11-2003, 01:49 AM
#6
Honda-Tech Member
Join Date: Sep 2002
Posts: 964
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (SurferX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SurferX »</TD></TR><TR><TD CLASS="quote">How mine ended up, my VTEC point was moved to 5000 RPM, fuel was increased from 5000-5700 RPM, then gradually leaned out afterwards up to redline.</TD></TR></TABLE>
I'm about to set up my vafc soon. Just wonder.... do you remember how much fuel you increased, from 5000-5700?
I'm about to set up my vafc soon. Just wonder.... do you remember how much fuel you increased, from 5000-5700?
06-11-2003, 08:49 AM
#7
Join Date: Apr 2002
Location: O.C., CA, USA
Posts: 1,248
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (Art Vandeleigh)
Yes those are the "Ne" points, the RPM points that you select for adjustment. The points under Hvt are for running under the big lobes and Lvt is for the primary lobes.
It will depend on your engine package how much fuel you are going to add/subtract, so really telling you exactly how my map is set won't do you much good since my motor is setup differently from yours.
It will depend on your engine package how much fuel you are going to add/subtract, so really telling you exactly how my map is set won't do you much good since my motor is setup differently from yours.
Trending Topics
06-11-2003, 09:39 AM
#8
Honda-Tech Member
Join Date: Sep 2002
Posts: 964
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (SurferX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SurferX »</TD></TR><TR><TD CLASS="quote">It will depend on your engine package how much fuel you are going to add/subtract, so really telling you exactly how my map is set won't do you much good since my motor is setup differently from yours.</TD></TR></TABLE>
I know it'll depend on the spesific engine how much fuel to add, but i'm planning to first tune with butt-dyno until I get all my boltons. Then take it to the dyno. I'm first of all planning to lower vtec to about 5000rpm so the car gets easier to drive on the track. It would therefore be interesting to know how much fuel you added, even though it wont be exactly the same on my engine.
I know it'll depend on the spesific engine how much fuel to add, but i'm planning to first tune with butt-dyno until I get all my boltons. Then take it to the dyno. I'm first of all planning to lower vtec to about 5000rpm so the car gets easier to drive on the track. It would therefore be interesting to know how much fuel you added, even though it wont be exactly the same on my engine.
06-11-2003, 12:09 PM
#10
Join Date: Apr 2002
Location: O.C., CA, USA
Posts: 1,248
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help.
On my car from 5000-5700 RPM the fuel was bumped up +2. I gained 22whp in that range from the earlier VTEC point and fuel addition. But that was with my setup that has a one of those whacky extra long sequentially paired headers so your results will vary. Do this at your own risk, without an A/F chart or at least torque chart you are going in blind.
06-11-2003, 12:18 PM
#11
Re: VAFC and tunning help. (SurferX)
If I remember correctly the VAFC cannot do anything with the fuel. It can not change the pressure. The only thing that can do that is an fpr. The AFC portion is air flow convertor, not air fuel controller. Basically you can add more air or take air away for certain rpm's to match the fuel map.
After you do your baseline, you will see where you are running rich. You then add air where your car is running rich and take away air where it is running lean. This does not tune for maximum power however. This makes the air/fuel ratio at it's ideal level, but you could gain more power by tweaking it a little more.
After you do your baseline, you will see where you are running rich. You then add air where your car is running rich and take away air where it is running lean. This does not tune for maximum power however. This makes the air/fuel ratio at it's ideal level, but you could gain more power by tweaking it a little more.
06-11-2003, 12:23 PM
#12
Honda-Tech Member
Join Date: Sep 2002
Posts: 964
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (SurferX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SurferX »</TD></TR><TR><TD CLASS="quote">Do this at your own risk, without an A/F chart or at least torque chart you are going in blind.</TD></TR></TABLE>
I'm not going to tune it all the way... Just bump up fuel from 5000rpm to 5800rpm a bit. But what kind of symptoms might I get if running too rich/lean.
I'm not going to tune it all the way... Just bump up fuel from 5000rpm to 5800rpm a bit. But what kind of symptoms might I get if running too rich/lean.
06-11-2003, 12:24 PM
#13
Join Date: Apr 2002
Location: O.C., CA, USA
Posts: 1,248
Likes: 0
Received 0 Likes
on
0 Posts
Re: VAFC and tunning help. (jdmspoonitr)
The VAFC tricks the MAP sensor into "seeing" different readings so that it goes to a different portion of the fuel map. So it does add fuel by modifying how much air the MAP sensor thinks it is seeing. So it indirectly tells the injectors to stay open longer/shorter. This is unrelated to fuel pressure, in which yes you need an FPR to modify that.
06-15-2003, 10:22 PM
#15
Re: VAFC and tunning help. (Art Vandeleigh)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Art Vandeleigh »</TD></TR><TR><TD CLASS="quote">Why 200 though???...im just trying to understand it....any more help...what about the other things.....
I really wantde to address the A/F and the way the VAFC can lean the fuel. I really want to understand how that is achieved through the VAFC. The instructions might as well be in Russsian. I just dont get it by reading the instructions...
</TD></TR></TABLE>
cant be 200...vafc will only allow vtec l-h h-l with a 300 difference
I really wantde to address the A/F and the way the VAFC can lean the fuel. I really want to understand how that is achieved through the VAFC. The instructions might as well be in Russsian. I just dont get it by reading the instructions...
</TD></TR></TABLE>
cant be 200...vafc will only allow vtec l-h h-l with a 300 difference
Thread
Thread Starter
Forum
Replies
Last Post
