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Maxing out LS7 MAF, is there a frequency shifter?

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Old Sep 28, 2022 | 05:41 PM
  #41  
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Originally Posted by TrendSetter
thanks, you too. says its going to drive right over the top of my house tomorrow. yay.
Yeah I'm hoping it gets knocked down by the time it hits the east coast or it's not going to be pretty. Currently staying in a non-block construction home.
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Old Sep 28, 2022 | 07:25 PM
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Originally Posted by ddnspider
Youre pointing out all the reasons I'm doing it. Everyone hates a MAF, everyone says the 98 is a bastard. Has anyone calculated how much power my cast bottomend ls6 with a 98 computer is making to max out airflow and frequency on an LS7 maf in a 4 inch tube on 93 gas? I like doing things that most don't realize can be done. It's fun 😊.
Dont hate a maf at all, have tuned way more cars with maf than in SD, just pointing out that when they fail its going to go lean. Going lean under a lot of boost equals expensive repair add that to a 98 pcm and your just purposely stacking the odds against yourself for a failure. A 98 pcm is a bastard and have crappy resolution compared to a 411 and is alot more prone to bricking or failing over a 411 pcm, those are just facts. No one is questioning if it can be done on a 98 pcm, it can be done but why make things harder on yourself? I have tuned 1,000hp cars with 98 pcm's years ago when there wasnt a better option. Now there are better, easier, and safer ways to do it so I personally wouldn't tune one now as a shop. If this was 24 years ago and your only option it would be completely different, might as well use ls1 edit and spreadsheets to tune it.

This may do it but I dont think they sell them anymore.https://www.jmschip.com/content/JMS_...ctions_Web.pdf
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Old Sep 28, 2022 | 07:33 PM
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Originally Posted by minytrker
Dont hate a maf at all, have tuned way more cars with maf than in SD, just pointing out that when they fail its going to go lean. Going lean under a lot of boost equals expensive repair add that to a 98 pcm and your just purposely stacking the odds against yourself for a failure. A 98 pcm is a bastard and have crappy resolution compared to a 411 and is alot more prone to bricking or failing over a 411 pcm, those are just facts. No one is questioning if it can be done on a 98 pcm, it can be done but why make things harder on yourself? I have tuned 1,000hp cars with 98 pcm's years ago when there wasnt a better option. Now there are better, easier, and safer ways to do it so I personally wouldn't tune one now as a shop. If this was 24 years ago and your only option it would be completely different, might as well use ls1 edit and spreadsheets to tune it.

This may do it but I dont think they sell them anymore.https://www.jmschip.com/content/JMS_...ctions_Web.pdf
Can't say I agree with using ls1edit and a spreadsheet. I'm not hacking anything, when I get the mod to work I'll still have full measured range and I'm still tuning off a WBO2 using BEN. Not sure how that relates to the old days when people would PE rape a tune. And when a MAF fails it typically goes lean because the ECU fails it and it reverts to the SD table that wasn't tuned, and then blows up. That's why you set the VE table to zero so there's no fuel instead of just lean.
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Old Sep 29, 2022 | 11:58 AM
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Originally Posted by ddnspider
And when a MAF fails it typically goes lean because the ECU fails it and it reverts to the SD table that wasn't tuned, and then blows up.
Not true at all.
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Old Sep 29, 2022 | 12:27 PM
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Originally Posted by NicD
Not true at all.
Please go on.
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Old Sep 29, 2022 | 04:13 PM
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Originally Posted by ddnspider
Please go on.
The maf usually just doest fail instantly and make the pcm go to SD, I actually never seen that happen. It just starts making it get leaner and leaner and most of time it wont even throw a maf code.
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Old Sep 29, 2022 | 04:24 PM
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Originally Posted by minytrker
The maf usually just doest fail instantly and make the pcm go to SD, I actually never seen that happen. It just starts making it get leaner and leaner and most of time it wont even throw a maf code.
Very interesting! Can't see I've seen that on any setup I've tuned but I'm sure it happens if you guys have seen it. There are certainly plenty of things to go wrong the more power you start making.
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