MAF Question
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Race Director
Joined: Mar 2004
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From: Fort Wayne IN
2025 C5 of the Year Finalist - Modified
C5 of Year Finalist (performance mods) 2019
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2016 C5 of the Year Finalist
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Thats not a problem at all. In your tune, you can adjust the O2 switching in HPT. If your O2 sensors are placed in an improper area, and its throwing off the way they read, just scale it accordingly. This happens on some long tube header designs where the O2's are placed too far down in the header, causing them to read the exhaust pulses wrong.
Even when you run SD, you are going to run Closed Loop SD. This means that you still use your front O2's to adjust fueling. You dont even want to run Open loop SD unless your a diehard tuner that runs around with his laptop in his car 24/7.
Even when you run SD, you are going to run Closed Loop SD. This means that you still use your front O2's to adjust fueling. You dont even want to run Open loop SD unless your a diehard tuner that runs around with his laptop in his car 24/7.
I think what we're going to do is just play it by ear when it comes to tuning day. I'm getting a ZO6 85mm maf for about $50 off an acquaintance that we're going to try, and go from there as necessary.
Former Vendor
Joined: Feb 2004
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From: Las Vegas NV
St. Jude Donor '06 & '12
I cant honestly see Slowhawk tuning a street car in OLSD. That means that wether is 25* outside or 95* and 90% humidity, your car will not compensate for atmospheric conditions AT ALL. But hey, he very well might have. With our temprature range out here, we cant do it. The swing is just to big.
In all seriousness, tuning your car with a MAF is not an optimal tune. Yes, it can be band aided to run, but your tuner is taking the easy way out. Its truely not a wise idea to run your 14psi twin turbo motor on a MAF tune. A 1 bar MAF tune on a forged 377 with 14psi?? No way.. YES, there are dozens of guys on here that have it that way. But if you were to pull the tune file, it is literally just skewed to make the car fuel accordingly. Its like turning off the monitor when your logging and tuning the car. I dont know of a reputable tuner on this board that would reccomend it.
Good luck in whatever route you take. Hopefully it'll work for you.
Just make sure he leans on the side of caution (rich side) when he does it.
In all seriousness, tuning your car with a MAF is not an optimal tune. Yes, it can be band aided to run, but your tuner is taking the easy way out. Its truely not a wise idea to run your 14psi twin turbo motor on a MAF tune. A 1 bar MAF tune on a forged 377 with 14psi?? No way.. YES, there are dozens of guys on here that have it that way. But if you were to pull the tune file, it is literally just skewed to make the car fuel accordingly. Its like turning off the monitor when your logging and tuning the car. I dont know of a reputable tuner on this board that would reccomend it.
Good luck in whatever route you take. Hopefully it'll work for you.
Just make sure he leans on the side of caution (rich side) when he does it.Slowhawk did my old tune on the stock motor open loop SD, cause he had to. It was flawless as far as I was concerned. I'll ask my tuner about the O2 scaling in HPT, that's something I"m unfamiliar with.
I think what we're going to do is just play it by ear when it comes to tuning day. I'm getting a ZO6 85mm maf for about $50 off an acquaintance that we're going to try, and go from there as necessary.
I think what we're going to do is just play it by ear when it comes to tuning day. I'm getting a ZO6 85mm maf for about $50 off an acquaintance that we're going to try, and go from there as necessary.
Thread Starter
Race Director
Joined: Mar 2004
Posts: 12,466
Likes: 886
From: Fort Wayne IN
2025 C5 of the Year Finalist - Modified
C5 of Year Finalist (performance mods) 2019
2017 C5 of the Year Finalist
2016 C5 of the Year Finalist
2015 C5 of the Year Finalist
See, I'm a bit of a dunce when it comes to tuning a MAF car, reason being is this LS1 is the first MAF car I've tinkered with. Two SD 93 F-body's and I was pretty decent with playing with the tunes on those, but setting fueling via the VE tables was pretty simple to me. Bring a MAF into the picture and I'm clueless.
I was under the impression that HPT had something that was an add-on that scaled the tables further for extra room on the MAF cars. If this isn't the case then I'm going to heavily lean towards the SD tune anyway then.
As for the O2's, they're just lazy where they're installed right behind the turbo's. Don saw it, I've watched it first hand while getting a baseline on the car last week. Not bad when you're moving air through there, but at idle and low RPM conditions, they simply don't like moving much. before it gets said, they were new when they went in during the initial APS install, and only have about 4k miles on them now and were clean as a whistle when I had them out recently.
I was under the impression that HPT had something that was an add-on that scaled the tables further for extra room on the MAF cars. If this isn't the case then I'm going to heavily lean towards the SD tune anyway then.
As for the O2's, they're just lazy where they're installed right behind the turbo's. Don saw it, I've watched it first hand while getting a baseline on the car last week. Not bad when you're moving air through there, but at idle and low RPM conditions, they simply don't like moving much. before it gets said, they were new when they went in during the initial APS install, and only have about 4k miles on them now and were clean as a whistle when I had them out recently.
