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Old 05-05-2014, 08:43 PM   #1
VanquisherSS
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Overboost Protection? Dropping Boost

Hey guys, having a werid issue and I figure i'd reach out here too. I'm dropping boost in my CTS-V on WOT pulls and getting a service vehicle soon on the DIC. Not sure if anyone has seen or experienced anything similar on their ZL1. Boost builds to about 14lbs and then after a few seconds goes to 0.

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Old 05-05-2014, 09:28 PM   #2
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What is the trouble code? That needs to be adjusted in the ECM through tuning.
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Old 05-05-2014, 09:51 PM   #3
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What is the trouble code? That needs to be adjusted in the ECM through tuning.
No codes.
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Old 05-05-2014, 10:15 PM   #4
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Belt slipping or upper pulley ?
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Old 05-05-2014, 10:19 PM   #5
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I wondered this to but slip should not go to zero....pulley issue makes more sense
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Old 05-05-2014, 10:39 PM   #6
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You didn't say you feel like the car is falling on its face. I think you would feel it if you're truly getting no boost. I'd find a manual boost gauge, tap it in and see if your issue isn't actually the gauge.
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Old 05-06-2014, 12:13 AM   #7
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Who tuned it? "MAP disable" and "MAP enable" needs to be bumped up to 250 kPa and 240 kPa respectively. And if you have a Service Vehicle Soon light come on there will be codes.
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Old 05-06-2014, 07:54 AM   #8
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Originally Posted by BPG View Post
You didn't say you feel like the car is falling on its face. I think you would feel it if you're truly getting no boost. I'd find a manual boost gauge, tap it in and see if your issue isn't actually the gauge.
It does and it doesn't. Yesterday I was driving it went WOT and it felt flat, looked down to see I was only making a little over 8-9psi. I shut the car off turned it back on and then I was back to making 14+psi

I hooked up my ultragauge and I got in it on the way to work today, looks like it peaked at 14.5LBs of boost, service vehicle came on, boost gauge dropped to 0 but the ultragauge kept reading 14+ on boost.

Perhaps its trying to dump the boost but cannot since I believe the actuator was disabled.
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Old 05-06-2014, 07:56 AM   #9
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Originally Posted by ZO6 Bryan View Post
Who tuned it? "MAP disable" and "MAP enable" needs to be bumped up to 250 kPa and 240 kPa respectively. And if you have a Service Vehicle Soon light come on there will be codes.
ECS tuned it. They are checking my tune right now to make sure that was done. It says service vehicle on the DIC but I do not get any CELs. My ultragauge can read codes and it did not throw any this morning. Onstar ran all the diagnostics and came up with nothing.
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Old 05-06-2014, 07:57 AM   #10
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Quote:
Originally Posted by VanquisherSS View Post
Hey guys, having a werid issue and I figure i'd reach out here too. I'm dropping boost in my CTS-V on WOT pulls and getting a service vehicle soon on the DIC. Not sure if anyone has seen or experienced anything similar on their ZL1. Boost builds to about 14lbs and then after a few seconds goes to 0.

2.38 Upper, Airraid, ARH Headers, Corsa Sport, Ported TB.

if you get stuck sir your more than welcome to give me a call and i can see if i can work out your issue for you on the phone
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Old 05-19-2014, 09:28 AM   #11
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Just an update. Working through what I believe a this point to be a tune issue. I have the following codes that only appear under WOT.

P1101 - Intake Air Flow System Performance

P012B - S/C Inlet Pressure Sensor Performance

P0121 - Throttle Position Performance

P0106 - Manifold Absolute Pressure Sensor Performance
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Old 06-09-2014, 12:27 AM   #12
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Car ended up needing a re-tune. I had it done at Race Proven Motorsports and they resolved all my issues.
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Old 06-10-2014, 02:00 PM   #13
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any explanation of what was wrong in the tune?
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Old 06-10-2014, 07:40 PM   #14
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Originally Posted by All-American ZL1 View Post
any explanation of what was wrong in the tune?
Well quite frankly a few things. I'll start from the top I guess.

1.) The service vehicle error and the codes I posted up. I sent an email to ECS telling them to check my overboost values(like i should be the one doing that). Was told that wasn't the issue. Well it was the values were set to bone stock which is why like clockwork at a boost > stock it threw errors. The worst part is I was told this was "normal" for the boost gauge to go to 0. Its not normal since my car doesn't do it now nor does any other V or ZL1 i've seen do that. It pegs at 15 and stays there.

2.) Front O2s were doing something very strange I believe pulling fuel out, i don't honestly remember. All I know it was commanding 10.0 AFR. The tune was so rich frankly Fran at RPM wouldn't even make a full pull on the dyno. You can see that in the dyno (Red graph)

3.) Driveability - I had a shit load of backfiring which as you can see was from running no cats and being insanely rich makes sense. I was told that was normal as well. Well after my re-tune I can say that it does not happen anymore. Yes I get a crackle and what not but thats to be expected. On and off throttle had a bunch of hesitations and felt way down on power around town.

4.) Trans Tune - Long of it short it was never done and had to be done by Fran @ RPM. Car drives amazing now.

Here's the dyno sheet. Pay attention to how much power I picked up almost everywhere in the RPM band from it actually being at the correct AFR and tuned right.


Last edited by VanquisherSS; 06-10-2014 at 07:51 PM.
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