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Check my tune

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Old Jan 17, 2014 | 04:56 PM
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Default Check my tune

Ok so finally got to messing around with my V2 software and I believe I read and saved the tune right. It should be attached.

My main concerns are the upshifts seem to take more throttle than they should, the max shift points feel a little low for my cam, WOT timing seems to be a little conservative and part throttle/medium load timing(hills) seems to be low. Cruising/low throttle/light load seems to be ok, even though my MPGs are sucking bad, like only 12-14.

Last edited by black00chev; Jan 20, 2014 at 07:37 PM.
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Old Jan 17, 2014 | 08:19 PM
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Do you have a log? Feel free to email me at dwrobb99@yahoo.com.
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Old Jan 17, 2014 | 09:03 PM
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efi live?
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Old Jan 17, 2014 | 09:13 PM
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I addressed the issues you mentioned. Also if you are concerned about mileage you should not increase the speed when the TCC engages. You should actually lower it in most cases so I put that back to stock. Without a log I cant be certain where your timing should be. I have had good luck with the timing tables that I inserted. As I always tell everyone without a log, use at your own risk. If you hear any pinging get out of it. You would also be much farther ahead by switching to a 1MB OS. Let me know how it works out for you.
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2000_5.3L_0000.tun (474.6 KB, 77 views)
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Old Jan 17, 2014 | 10:38 PM
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If you want to try a nice aggressive but very predictable shift strategy try the shift point settings from my tune. It downshifts on command and the upshifts are spaced right so the engine isn't falling on its face but you aren't having to lift off the pedal to make it upshift at lighter throttle. The TCC unlock in 4th and the 4-3 downshift happen pretty early when pulling hills but I did this to A: keep enough torque up to keep it from downshifting to 3rd as much while still holding set cruise speed and B: to downshift to 3rd before it would start to drop below set cruise speed. I hated how the stock settings would let it drop down 3-4 mph from the set cruise speed before the transmission would respond in any way. FWIW I run this tune on 87 octane and get along just fine. Not sure why I still label it as a 91 octane tune.
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Old Jan 18, 2014 | 03:28 AM
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Yes EFI Live, read via v7.5 tune tool.

Ill probably try my first shot at getting some data logging in tomorrow.
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Old Jan 18, 2014 | 07:08 AM
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+1 for Gadgetized. He's my go to guy for ls stuff
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Old Jan 18, 2014 | 04:21 PM
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Well it was really windy today so I held off. Supposed to be the same way tomorrow.

Gadgetized, whats your opinion on how my current tune looks? Does what I feel show in the tune? I looked over what you sent me and it looks better.
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Old Jan 18, 2014 | 05:18 PM
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When you adjust the shift point at low throttle percentages even a couple miles per hour makes quite a bit of difference. That is more than likely what you disliked. Also when shifting at WOTyou need to set your desired RPM and desired speed. Both of those parameters need to be met in order for the tranny to shift. That was also your problem when it was shifting out too soon for your liking with the better cam. I have had real good luck with increasing the timing in the cruisung cells for fuel mileage. To a point the more timing you can get away with the more power it will make, the more power it makes will let you cruise in a lower kPa cell or lower down the MAF cells and that will require less fuel. The best thing for mileage is to take off easy, that is where most of your mileage is lost.
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Old Jan 18, 2014 | 07:54 PM
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Originally Posted by Gadgetized
You would also be much farther ahead by switching to a 1MB OS. Let me know how it works out for you.
You can't put a 1MB OS in a 500KB PCM...
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