Ported Tb Tuning
06-25-2012, 07:24 PM
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Ported Tb Tuning Just installed a ported LS6 TB, I'm using efi live to tune. Does anyone know which tables need to be adjusted. I'm still figuring the mapping on this car, I'm just looking to calm the Idle down. Right now I'ts bouncing up to 3000 rpm while rolling in neutral. Thanks for the help folks.
06-25-2012, 07:49 PM
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Those where my initial concerns, I've checked all the vacuum lines, brand new tb seal as well as new valve cover & valley cover vent lines. Brake booster vacuum line is intact and solid as well. I've been scratching my head on this one, because I can't find anything in the mapping that suggests this sort of behavior either....
06-25-2012, 08:11 PM
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I know porting is beneficial but I also know it's critical that u dont get too close to the plate or it won't seal correctly and will cause tuning issues. Who did the port work?
06-25-2012, 08:47 PM
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06-26-2012, 02:34 PM
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Well now, there is oil coming out the manifold into the tb...fml. $50 says the machine shop f":":{: up a valve seal when they where going through my heads..... I'm not going to wonder why this didn't happen with the oem TB so I will be tearing this sob apart again. as heavy metals says "mod hell" haha.
Edit: it seems the oil is keeping the tb from sealing, Tb seals just fine.
Edit: it seems the oil is keeping the tb from sealing, Tb seals just fine.
06-26-2012, 03:06 PM
#11
Doing this hack way only solves idle, but all your air measurements will be off going through the rpm range.
Porting throttles has a definitive portion, used for controlling idle, if you port that portion... you have gone too far.
06-26-2012, 08:41 PM
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I'm going to go ahead and just kick my own *** for this. I managed to swap the valve cover vent and the valley cover vent trying to beat the rain........as I walk away in shame for my stupidity.
06-26-2012, 09:44 PM
#14
You are wrong thinking its just for idle - I can now assume you have never tuned a car.
Of course it works but for the wrong reason, its not ideal or good practice, perhaps you clearly didn't understand what I was saying.
Your ENTIRE table of calculations for fueling is based on the computer knowing the AREA VOLUME of the throttle which is a value the ECM looks at. You clearly did not tell the computer, hey, I have a larger 90mm throttle from a 78. Meaning, you have thrown away a good portion of the entire purpose you were trying to achieve by changing the throttle in the first place. Larger throttle, to just skew the tuning.
Your computer still calculates air velocity based on the area if your throttle was 78mm. Means, at ALL RPM and ALL THROTTLE %... your computer is fueling based on 78mm throttle, but you have added more air, without more fuel. because the ECM doesn't know what you did. This does not work. If your AFR was ideal and giving you peak before, you definitely gained zero for your mod, and was a waste of your time.
Its one of those things, your fueling could be off by as much as Ive seen 8% through all rpms and throttle positions logging, especially WOT. Easily avoidable.
Ive experienced both methods, I will never drill.
Last edited by vmapper; 06-26-2012 at 09:52 PM.
