SD or MAF tune
10-31-2012, 05:01 AM
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SD or MAF tune OK I thought I would ask a few of yall to see what you think. I am building a boosted 5.3 to start then a built ls1 car is a 6spd and I want to run water meth when I need it.
I want to be able to keep it chill on 500 for day to day driving but if need be turn it up and make 800-1000 on kill. Can this tune be doneor if the HP to high of a jump to have all in one tune and should I run a MAF or go SD. If so what maf goal is to talk softly but carry a big stick thanks for your help.
I want to be able to keep it chill on 500 for day to day driving but if need be turn it up and make 800-1000 on kill. Can this tune be doneor if the HP to high of a jump to have all in one tune and should I run a MAF or go SD. If so what maf goal is to talk softly but carry a big stick thanks for your help.
10-31-2012, 12:21 PM
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Sorry for the confusion, I wanted to know SD tune or MAF tune. I Want to run 500 HP normally and 900 on kill. This will be a daily driver, and will need street manners, needs to be able to adjustment boost and not have to get it retuned. Temperature and altitude changes I want the tune to compensate for. I hope that's better to understand.
Last edited by Blastin; 11-02-2012 at 10:30 PM.
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11-01-2012, 02:56 PM
#8
A 2 bar MAP goes to 15 psi or about 700 rw, but you can make more with it but your PCM won't be able to "see it". 3 bar measures a max of 28 psi of boost or a gazillion hp.
For example, before going 2 bar SD on my car, it made 540 rw at 9 psi. Still had the 1-bar MAP in there so it had to be tuned for WOT/9psi at 1 bar even though it was really at 1.6 bar. So pegging your MAP means your PCM can't be tuned for part throttle, only WOT making part throttle incredibly rich. But if you are only making a couple psi over the MAP max it's really not a big deal.
There's a whole debate over 2 bar/3 bar selection if you do a search.
For temperature you will have to tune the startup enrichment table when it gets cold. Normal driving it's not an issue.
As far as altitude I don't have experience as I'm in north Texas where it's always 110'. I would guess that it could be a problem if you where driving cross country due to big changes in air density. I think if you were tuned at low altitude then going up into the thin air it would just get rich which won't hurt anything but mileage. Tuning at high altitude then coming down into dense air might cause a problem. If someone has direct experience that would be cool to share it.
For example, before going 2 bar SD on my car, it made 540 rw at 9 psi. Still had the 1-bar MAP in there so it had to be tuned for WOT/9psi at 1 bar even though it was really at 1.6 bar. So pegging your MAP means your PCM can't be tuned for part throttle, only WOT making part throttle incredibly rich. But if you are only making a couple psi over the MAP max it's really not a big deal.
There's a whole debate over 2 bar/3 bar selection if you do a search.
As far as altitude I don't have experience as I'm in north Texas where it's always 110'. I would guess that it could be a problem if you where driving cross country due to big changes in air density. I think if you were tuned at low altitude then going up into the thin air it would just get rich which won't hurt anything but mileage. Tuning at high altitude then coming down into dense air might cause a problem. If someone has direct experience that would be cool to share it.
11-02-2012, 10:20 PM
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A 2 bar MAP goes to 15 psi or about 700 rw, but you can make more with it but your PCM won't be able to "see it". 3 bar measures a max of 28 psi of boost or a gazillion hp.
For example, before going 2 bar SD on my car, it made 540 rw at 9 psi. Still had the 1-bar MAP in there so it had to be tuned for WOT/9psi at 1 bar even though it was really at 1.6 bar. So pegging your MAP means your PCM can't be tuned for part throttle, only WOT making part throttle incredibly rich. But if you are only making a couple psi over the MAP max it's really not a big deal.
There's a whole debate over 2 bar/3 bar selection if you do a search.
For temperature you will have to tune the startup enrichment table when it gets cold. Normal driving it's not an issue.
As far as altitude I don't have experience as I'm in north Texas where it's always 110'. I would guess that it could be a problem if you where driving cross country due to big changes in air density. I think if you were tuned at low altitude then going up into the thin air it would just get rich which won't hurt anything but mileage. Tuning at high altitude then coming down into dense air might cause a problem. If someone has direct experience that would be cool to share it.
For example, before going 2 bar SD on my car, it made 540 rw at 9 psi. Still had the 1-bar MAP in there so it had to be tuned for WOT/9psi at 1 bar even though it was really at 1.6 bar. So pegging your MAP means your PCM can't be tuned for part throttle, only WOT making part throttle incredibly rich. But if you are only making a couple psi over the MAP max it's really not a big deal.
There's a whole debate over 2 bar/3 bar selection if you do a search.
For temperature you will have to tune the startup enrichment table when it gets cold. Normal driving it's not an issue.
As far as altitude I don't have experience as I'm in north Texas where it's always 110'. I would guess that it could be a problem if you where driving cross country due to big changes in air density. I think if you were tuned at low altitude then going up into the thin air it would just get rich which won't hurt anything but mileage. Tuning at high altitude then coming down into dense air might cause a problem. If someone has direct experience that would be cool to share it.
