Running 60s for the first time a few ?s
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From: Harrisburg, PA
Running 60s for the first time a few ?s
Ok so ive seen a number of ways to set these up should the offset voltage be 1.19 or 1.25 or does it even matter?
Also this short pulse adder thing, Ive read it a few times im just not grasping the concept
Also this short pulse adder thing, Ive read it a few times im just not grasping the concept
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From: Sasebo Japan
1.25
short pulse adders are the amount the pcm adds if the short pulse limits are below the short pulse limit u put to be the limit..so if they drop below that...those are the adders that will get it back above
short pulse adders are the amount the pcm adds if the short pulse limits are below the short pulse limit u put to be the limit..so if they drop below that...those are the adders that will get it back above
Last edited by Raven SS; May 5, 2008 at 07:01 PM. Reason: Automerged Doublepost
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From: Sasebo Japan
iirc its to help with idle..im not perfect on fuel sjshafer is my fuel guy...i told him to peak at ur question..for some reason he gets all the info that is very hard to get for fuel...and then it only makes sense to him lol...some of the best tuners on this site use his fuel maps...
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Okay, this is how it works. Your injectors have a range down low where they will fire off errors at certain PWs. The ECM asks them to fire, say .9ms and they say, "I'm trying, but it ain't working". The adders are there to compensate. You add to the PW in the low areas so that your in jectors will actually fire the correct ammount of fuel in it's low, non-linear areas. The low PW limit is just there to tell the computer when to look at the adder table. It's really simple in thoery. Just a bitch to tune. With a dead head fuel system, it's next to inpossible to get them perfect. You almost have to live with a little rich decel to not have lean misfires. Going with a return fuel system with a manvac referrenced regulator makes the whole process a LOT easier!
BTW, it is possible to tune the offset tables, but it is incredibly time consuming and tedious. You have to tune your MAF perfectly under normal circumstances, then add a modifier of sorts and see how far it is off. You can do that by changing your stoich from 14.7 to 14.2 and see where the errors lay, for instance. It is much easier to get them from someone else who actually has correct offsets.
lol. No worries. Now find me an intake gasket! 
BTW, it is possible to tune the offset tables, but it is incredibly time consuming and tedious. You have to tune your MAF perfectly under normal circumstances, then add a modifier of sorts and see how far it is off. You can do that by changing your stoich from 14.7 to 14.2 and see where the errors lay, for instance. It is much easier to get them from someone else who actually has correct offsets.
Last edited by SJSchafer; May 5, 2008 at 07:26 PM. Reason: Automerged Doublepost
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A return system is certainly something that im not going to mess with right now
Anyone have a histogram or something they can send me to set up this short adder table
Is this something that varies that much car by car, so just swapping in a tune from another car for this table wouldnt work?
Anyone have a histogram or something they can send me to set up this short adder table
Is this something that varies that much car by car, so just swapping in a tune from another car for this table wouldnt work?
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if you could send that to matt38y3@yahoo.com that would be awesome, I cant afford to be without a car long even if its good enough for regular driving just to get me up and running that would help out a TON
But I sent him one of the others I use sometimes
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OK im totally confused here, all these how to things on here say how to tune the VE in open loop and I can do that , but what the hell do you do after that?
What histogram am I supposed to use to correct the MAF table, some say to do MAF in open loop first then worry about VE, I dont know what to do, Ive gone out and made about 3 runs and copy and pasted in the VE and it just seems like im chasing it back and forth, it never comes out between +5 and -5 its 15 one way, I fix it then it goes back the other way
What histogram am I supposed to use to correct the MAF table, some say to do MAF in open loop first then worry about VE, I dont know what to do, Ive gone out and made about 3 runs and copy and pasted in the VE and it just seems like im chasing it back and forth, it never comes out between +5 and -5 its 15 one way, I fix it then it goes back the other way
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I dont feel like im getting anywhere with this thing, I've done about 4 VE runs and its like none of the changes i make seem to make the values fall within the + - 4 range
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Leave your VE alone right now. Concentrate on MAF. Set up a histo that logs AFR error against a table that mimics your MAF table. Search my posts about how to set up short pulse adders and filtering MAF, etc...
