450's + Vafc + Missing link = OK?
11-09-2003, 03:36 PM
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450's + Vafc + Missing link = OK?
Hey guys,
I have a t3/t4 on my built d16y8, . It currentyly has 310's, an fmu, vafc and missing link. Im replacing the 310's with 450's and am going to run the "hack" Will having the missing link allow me to run about 12 psi fine, or should I get rid of it and stay below the 10.65 that the stock map sensor can take. Or is the missing link irrelevant to the vafc hack. Thanks
I have a t3/t4 on my built d16y8, . It currentyly has 310's, an fmu, vafc and missing link. Im replacing the 310's with 450's and am going to run the "hack" Will having the missing link allow me to run about 12 psi fine, or should I get rid of it and stay below the 10.65 that the stock map sensor can take. Or is the missing link irrelevant to the vafc hack. Thanks
11-09-2003, 05:03 PM
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Re: 450's + Vafc + Missing link = OK? (Johnyquest)
could you elaborate on this please. I apologize if this is a stupid question, I'm new to the whole forced induction thing, and have been reading as much as I can.
11-09-2003, 05:54 PM
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Re: 450's + Vafc + Missing link = OK? (2muchPSI)
do not use the missing link. I dont think that I can elaborate any further on that. Your map sensor needs to be left alone when running the hack, just hook up the afc like normal, and your injectors, and put in your settings... simple. get it?
Rob
Rob
11-09-2003, 06:03 PM
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Re: 450's + Vafc + Missing link = OK? (2muchPSI)
sounds good, you can actually keep the 310 injectors in there, but since you allready have 450....
Rob
Rob
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11-09-2003, 07:36 PM
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Re: 450's + Vafc + Missing link = OK? (2muchPSI)
use the 450's, I assume they are the dsm's. Slap those in, and then your gonna have to run resistors or a resistor box. Do a search and you'll find all the stuff you need. You'll be happy with the 450's, that along with the afc and you'll have the poor mans version of hondata. JK
11-09-2003, 07:55 PM
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Re: 450's + Vafc + Missing link = OK? (imlachg1)
WOW jump on my crap im an idiot!
You can use 310's you will just have to adjust the fuel accordingly. Think about it, you run 450's and cut a crap load of fuel, if you use smaller injectors you just cut less fuel. The reason you will cut less fuel is because the flow rate of the 310's is closer to the stock applications.
Rob
You can use 310's you will just have to adjust the fuel accordingly. Think about it, you run 450's and cut a crap load of fuel, if you use smaller injectors you just cut less fuel. The reason you will cut less fuel is because the flow rate of the 310's is closer to the stock applications.
Rob
11-09-2003, 08:00 PM
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Re: 450's + Vafc + Missing link = OK? (rjardy)
This is for all the folks who think that I would steer someone wrong.
https://honda-tech.com/zerothread?id=137901
This is THE honda-tech "hack" thread. It talks about the use of 310 cc injectors with this setup, and that it does indeed work.
Rob
https://honda-tech.com/zerothread?id=137901
This is THE honda-tech "hack" thread. It talks about the use of 310 cc injectors with this setup, and that it does indeed work.
Rob
11-09-2003, 08:06 PM
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Re: 450's + Vafc + Missing link = OK? (rjardy)
yeah, i understand all of that, and know how to wire in the resistors, but running 10 psi, am I going to need more fuel than the 310's can flow? I thaught maxing out the injectors wasn't ideal?
Also, what percentage of the fuel can you cut with the afc?
Also, what percentage of the fuel can you cut with the afc?
11-09-2003, 08:09 PM
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Re: 450's + Vafc + Missing link = OK? (2muchPSI)
yeah with 10 psi you may want to run the bigger injectors. I just got kinda upset that people thought that I was talking out my ***. as far as cutting fuel goes on the afc, ill go out to my car and check right now. BRB its just going to be whatever the most can be subtracted on the afc...
Rob
Rob
11-09-2003, 08:19 PM
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Re: 450's + Vafc + Missing link = OK? (2muchPSI)
Thanks
Well it looks like you can cut up to 50% fuel. But if you start at 40% that will give you 10% to play with. But with smaller injectors, you dont have to cut more fuel, you have to cut less due to the flow of the injector. I know at first that does not sound like it makes sense but it does, larger injectors require more of a fuel cut on the hack, why do you think we have to cut up to 40%? and for an injector that is closer to stock ( but still flows quite a bit more) you will need to cut less fuel. It will work, but at 10 psi i dont know, you may want to just run it once at look at your a/f ratio and see what you are getting out of the 310's start at low boost and work your way up.
Rob
Well it looks like you can cut up to 50% fuel. But if you start at 40% that will give you 10% to play with. But with smaller injectors, you dont have to cut more fuel, you have to cut less due to the flow of the injector. I know at first that does not sound like it makes sense but it does, larger injectors require more of a fuel cut on the hack, why do you think we have to cut up to 40%? and for an injector that is closer to stock ( but still flows quite a bit more) you will need to cut less fuel. It will work, but at 10 psi i dont know, you may want to just run it once at look at your a/f ratio and see what you are getting out of the 310's start at low boost and work your way up.
Rob
11-09-2003, 08:24 PM
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Re: 450's + Vafc + Missing link = OK? (rjardy)
couldnt you use a missing link and just take out less map sensor voltage in the lower rpms and barely any in the upper rpms.
11-09-2003, 08:32 PM
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Re: 450's + Vafc + Missing link = OK? (94goldjungsr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94goldjungsr »</TD></TR><TR><TD CLASS="quote">couldnt you use a missing link and just take out less map sensor voltage in the lower rpms and barely any in the upper rpms. </TD></TR></TABLE>
No because the afc needs to see the boost. As we all should know, its not the map sensor that has an issue with boost (under ~10.7 psi) its the ecu. so what happens is that the map sensor sees the boost, then sends the voltage to the afc, the afc manipulates it and sends voltage that is acceptable to the ecu.
Rob
No because the afc needs to see the boost. As we all should know, its not the map sensor that has an issue with boost (under ~10.7 psi) its the ecu. so what happens is that the map sensor sees the boost, then sends the voltage to the afc, the afc manipulates it and sends voltage that is acceptable to the ecu.
Rob
11-09-2003, 08:34 PM
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Re: 450's + Vafc + Missing link = OK? (rjardy)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rjardy »</TD></TR><TR><TD CLASS="quote">
No because the afc needs to see the boost. As we all should know, its not the map sensor that has an issue with boost (under ~10.7 psi) its the ecu. so what happens is that the map sensor sees the boost, then sends the voltage to the afc, the afc manipulates it and sends voltage that is acceptable to the ecu.
Rob</TD></TR></TABLE>
Precisely. So when you take out 30-35% map sensor voltage from 8 or 9psi (which is say 22psi). It becomes essentially 22*.65 to the ecu. Which is 24psi, or ambient. So if you use a missing link and you tune your car with an afc, you can basically just not take out any fuel at all, just in the lower rpms slightly as it will run overly rich at lower boost levels.
got it?
No because the afc needs to see the boost. As we all should know, its not the map sensor that has an issue with boost (under ~10.7 psi) its the ecu. so what happens is that the map sensor sees the boost, then sends the voltage to the afc, the afc manipulates it and sends voltage that is acceptable to the ecu.
Rob</TD></TR></TABLE>
Precisely. So when you take out 30-35% map sensor voltage from 8 or 9psi (which is say 22psi). It becomes essentially 22*.65 to the ecu. Which is 24psi, or ambient. So if you use a missing link and you tune your car with an afc, you can basically just not take out any fuel at all, just in the lower rpms slightly as it will run overly rich at lower boost levels.
got it?
11-09-2003, 08:34 PM
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Re: 450's + Vafc + Missing link = OK? (94goldjungsr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94goldjungsr »</TD></TR><TR><TD CLASS="quote">couldnt you use a missing link and just take out less map sensor voltage in the lower rpms and barely any in the upper rpms. </TD></TR></TABLE>
Wait i think i just understood your question diferently. are you saying, why not just have the map not see boost and add fuel based on rpm only? If this would work, than all the afc timing issues would become null as well. I kind wish i had the hack right now so i could mess with it and find out.
Rob
Wait i think i just understood your question diferently. are you saying, why not just have the map not see boost and add fuel based on rpm only? If this would work, than all the afc timing issues would become null as well. I kind wish i had the hack right now so i could mess with it and find out.
Rob
11-09-2003, 08:35 PM
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Re: 450's + Vafc + Missing link = OK? (94goldjungsr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94goldjungsr »</TD></TR><TR><TD CLASS="quote">
Precisely. So when you take out 30-35% map sensor voltage from 8 or 9psi (which is say 22psi). It becomes essentially 22*.65 to the ecu. Which is 24psi, or ambient. So if you use a missing link and you tune your car with an afc, you can basically just not take out any fuel at all, just in the lower rpms slightly as it will run overly rich at lower boost levels.
got it?</TD></TR></TABLE>
Crap man, i dont see why this would not work! any one want to try it?
Rob
Precisely. So when you take out 30-35% map sensor voltage from 8 or 9psi (which is say 22psi). It becomes essentially 22*.65 to the ecu. Which is 24psi, or ambient. So if you use a missing link and you tune your car with an afc, you can basically just not take out any fuel at all, just in the lower rpms slightly as it will run overly rich at lower boost levels.
got it?</TD></TR></TABLE>
Crap man, i dont see why this would not work! any one want to try it?
Rob
11-09-2003, 08:35 PM
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Re: 450's + Vafc + Missing link = OK? (rjardy)
the timing issue will still be there but you just have to do a lot less voltage manipultion which could equate to more resolution.
11-09-2003, 08:42 PM
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Re: 450's + Vafc + Missing link = OK? (94goldjungsr)
meh ive decided it will be exactly the same with more resolution. not wroth it at all though. the transition into boost will be too hard to tune and overcomplex and nearly impossible to tune with the adjustability of the afc.