09-26-2020, 09:18 PM | #15 | |
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I know a ton about software integration. Tuning to me is still a black art. I will leave it to the experts.
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"Democracy Dies in Darkness" |
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09-27-2020, 10:01 AM | #16 |
2018 SS A8 11.85@117.06
Drives: 2018 Camaro SS A8 "Dark Knight" Join Date: Oct 2019
Location: MICHIGAN
Posts: 212
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Thanks Not worried just glad the IM LT2 are in stock
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DARK KNIGHT
2018 SS A8 11.85 @ 117.07 GPI Tuned E85 stock tires Roto Fab CAI LT 2 intake |
09-28-2020, 08:27 AM | #17 |
Drives: 2023 Chevrolet Camaro 2SS 1LE Join Date: Jan 2020
Location: Pennsylvania
Posts: 1,033
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I’ve been asking a lot about this subject as well and have seen people say they ran a little lean at wot or say their afr remained steady. I don’t know very much about tuning I will admit, but I am starting to wonder if the people who saw their car go lean immediately looked at afr before driving the car around a bit and letting the ecm do its self calibrations. The reason I am thinking this is because i remember talking to one guy who’s car didn’t run properly after the install (Forgot to disconnect battery before install) but after a few miles it went back to running normal.
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09-28-2020, 11:36 AM | #18 | |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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Quote:
The kicker is our o2 sensors are narrow band, meaning they are only built to look in a small range of data. If youre outside of that range it might try and add fuel or lean things out when you don't want it to. That's why it's important to have a wide band sensor so you know what things are doing. Cause it may be rich in most of the rpm range but have a lean spike that the computer can't see and just continues to lean the set tune out. One last thing. The tune usually switches to the maf sensor after a certain rpm and doesn't use the o2 sensors. So if that's off you may be fine driving around town with the o2 sensors doing their job but once you get on the gas what ever is set into the tune is what your going to get. |
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09-28-2020, 12:38 PM | #19 | |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,395
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Quote:
just be sure to get plenty of logs on the stock intake manifold beforehand.
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2016+ camaro: everyone’s first car
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09-29-2020, 11:51 AM | #20 | |
Drives: 2017 SS 1LE, 2016 1SS (previous) Join Date: Apr 2016
Location: Metro-Detroit
Posts: 1,863
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Quote:
The LT2 intake TB opening doesn't seem to be all that different than the LT1 intake. The big thing with the LT2 intake is equalizing the runners and increasing the plenum volume. This allows easier flow into the runners (plenum) and equalizes flow through each of the runners (runner dimensions); it will also augments the strength of resonance tuning (plenum). The runner cross-section should be the same (per GM) and the runner lengths for the LT2 are roughly within what the LT1 is (per GM). So, you are changing the efficiency of air into the engine between the intake tract system (TB, intake tube, MAF housing, airbox) and heads (intake port, intake valve and chamber). You can only pull so much air from the 87mm TB+stock intake tube and expel so much/pull in so much air through the factory exhaust on the factory cam. The questions are: 1. At what capacity did GM accommodate, in their factory tune, of the 87mm TB and factory intake tract/tube in the Camaro? Someone out there should already know this by now from tuning these engines. We know it's not 100% through people changing to an MSD intake or larger TB only and their data logs. 2. Is the flow potential between LT1 and LT2 intakes enough to push outside the factory MAF calibration? This is something else we should be getting to know now. We know the MSD can max out the factory MAF calibration by around 5,500RPM and we know (per GM) the LT2 intake can flow 4% more than the LT1 intake. The MSD has a larger, bell-mouthed TB opening, shorter, larger runners with a similar plenum to the LT1. It seems ported LT1 intakes flow somewhere close to 4% better than factory and there are plenty of people running ported LT1 intakes without a tune. GPI has stated they don't believe a tune is needed. We shall see |
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09-29-2020, 12:10 PM | #21 | |
Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016
Location: Norman, OK
Posts: 2,424
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Quote:
While correct in how the MAF picks up, 4k RPM's isnt a set in stone point as it depends on where PE (power enrichment) is set to come online at. The MAF scale though does rely on the EQ Ratio to determine the commanded A/F and then uses the airflow data the MAF gives it to determine what EQ Ratio to use.
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2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp
2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD |
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09-29-2020, 01:01 PM | #22 | |
Drives: 2017 C7 GS M7 / 2017 Camaro SS 1LE Join Date: Dec 2016
Location: Idaho
Posts: 198
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MAF value will be used to calculate amount of fuel to reach the commanded EQ ratio. PE or not. PE is just additional enrichment on top of normal ratio. (Around 1.13-1.19, so 13-19% more fuel). If MAF sees more air it adds more fuel plain and simple. Ideally the best is to have a wideband to be 100% sure but IHMO it is safe. |
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09-29-2020, 07:53 PM | #23 |
Drives: 2016 2SS 8AT Join Date: May 2018
Location: Nevada
Posts: 358
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If your doing just the intake I wouldn't worry. If you already have other mods like a cai it's better to be safe then sorry.
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09-29-2020, 10:06 PM | #24 | |
Drives: 2017 Camaro 1SS M6 Join Date: Apr 2015
Location: Indy
Posts: 2,460
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Quote:
One thing that's interesting is the worse flow at ~3600RPM and subsequent (~13 lb-ft drop there) with the LT2 manifold.
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10-14-2020, 12:12 PM | #25 |
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Reply to myself....
"I have one on order. I am a bit peeved GPI took my Paypal $$ with no delivery date to ship. But I might as well buy it anyway, it will be easy to sell if I do not use it." In the discussion I was a little peeved about this But not worried about GPI. Now I want to shout out GPI for how well thet treat thier customers. First they are really on top of shipping and delivery notifications. When I received my LT2 IM it was shipped without the map extension. I was bummed as I was planning to do the install this weekend. But after I called them they shipped me the extension overnight! My weekend covid plans are saved! Now I have the LT2 IM to install and I also now I have a C8 cover. In addition this weekend I plan to pull the bumper cover off to better fit my Velossa Tech scoop. I like that it just helps IATs and not really the airflow. The LT2 already runs a touch lean up top. With good Atco air I hope for 11s on a stock tune, seats in. Given that I want to kee p my LT1 for my forever I am putting off a tune for now. Especially if Atco closes. :(
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10-14-2020, 12:20 PM | #26 | |
2018 SS A8 11.85@117.06
Drives: 2018 Camaro SS A8 "Dark Knight" Join Date: Oct 2019
Location: MICHIGAN
Posts: 212
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Quote:
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DARK KNIGHT
2018 SS A8 11.85 @ 117.07 GPI Tuned E85 stock tires Roto Fab CAI LT 2 intake |
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10-14-2020, 06:59 PM | #27 | |
Drives: 2021 LT1 10 speed auto Join Date: May 2013
Location: Connecticut
Posts: 2,343
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10-14-2020, 07:38 PM | #28 |
Drives: 2017 SS 1LE Join Date: Mar 2017
Location: Florida
Posts: 617
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I gave up. Sent a note part received and mods in work. Called two weeks.later, waiting on extention, then waiting on manifold.... After four weeks and three calls with three different reasons.
Will just wait and do it myself... And get a return. I'm sure they are good people, but lack of clarity concerns me. |
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