01-17-2024, 10:43 AM | #29 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,155
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You do realize that HPT only shows you a portion of the tables actually used in the ECM. Probably more than most of the vehicles, but still a lot of tables they never touch.
It's not my car so tweak away at your formula and try and tune it to some high boost level using it. It should be very close in closed loop mode, where the wideband isn't needed. I will weigh in on any post that portends to say how great it works as a warning to those who don't know better. |
01-17-2024, 11:50 AM | #30 | |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,155
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01-17-2024, 11:55 AM | #31 | |
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This is what the OEMs do - they calculate what they need for fuel based on a given amount of air, and then they provide that to the engine. But they know it won't always be spot on for all sorts of reasons, and so there is a constant feedback loop of monitoring the result, and continuing to adjust the fueling accordingly. Tuning on a calculated AFR alone is never going to be a good idea.
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01-17-2024, 11:59 AM | #32 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,155
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01-17-2024, 01:28 PM | #33 | |
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Tuning for WOT is critically dependent on using an external sensor to properly calibrate the air-fuel ratio. It's also why when I tune I will tend to defer slightly towards the safe side of the AFR, in order to allow for some unforeseen variables coming into play that would alter the AFR in a negative way. The power to be gained or lost in a half a point of AFR is fairly minimal. For a race application, sure, you get all you can. Those cars also typically have the best fuels and maintenance routines, and are kept under high levels of oversight. For a street driven car, I will absolutely roll 2-3% of WOT fueling back in the calibration once it's finished as a buffer, it might cost a couple horsepower, but it also gives the engine a better shot at a long happy life with a less involved operator that might neglect a fuel filter, run some less than top tier fuel, etc. I'll do the same with the spark - we'll get that maximized, and then take just a small step back for a bit of a safety margin. It's also worth noting that we're talking about 5th gen Camaro's here. There are plenty of other vehicles on the road that utilize closed loop fueling in all modes of engine operation, including WOT/power enrichment. It's a better strategy - you'd have to ask GM why they went with their scheme. It's usually related to money...
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GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
Got a question about a GPI product? Feel free to shoot me a message! |
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01-17-2024, 02:07 PM | #34 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,155
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Somehow I interrupted "Tuning on a calculated AFR alone is never going to be a good idea" to mean "fueling based upon desired AFR". Not sure how I did that, but that is really what you answered to anyway.
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01-17-2024, 09:08 PM | #35 | |
Drives: 2014 ZL1 Join Date: Jun 2009
Location: Tucson, AZ
Posts: 316
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Seems I hit a nerve here. Relax, boomer lol. Yes I have access and the knowledge to do all those things. It's not overly difficult. I'm not here for a dick measuring contest. If you have relevant questions I'm happy to help. To answer your question my car makes 15 psi. I hope that helps with your wild endeavors
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2014 ZL1 M6: Roto Fab Intake, LS3 TB, Long Tube Headers, NPP, Mild 2 Wild, JMS BAP, SMG aux pump, ID 1050X Injectors, DSX Flex Fuel Sensor, 10.5" DSX Lower Pulley, Killer Chiller, Tuned by Ted at JRE, Pedders XA Extreme coilovers, Mickey Thompson Street S/S on Weld S71s
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