Cobb AP 21psi?
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Yeah, 21psi peak is pretty normal for colder weather in Cobb OTS Stage 1. People in vegas and florida see ~19psi. The ECU will make different amounts of boost to hit torque targets, so you won't always see 21psi peak, but no need to worry, 21psi peak is normal (based on what other people report and what I've seen)
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40 Posts
At stage 3 I usually hit 22 and then rarely ill see 23psi but thats when its nice and chilly.
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I just got my pro tune and boost hits 25 psi in the cold mornings
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Yes boost is good and all but after the pro tune I am having some issues and I believe it's the bpv. If I accelerate in first gear under normal throttle, after around 3k rpms my bpv will open even if im still giving it gas.
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yes kind of. I just cross checked my ots map and yes air holds until I let go of the gas but as soon as I switched to bills pro tune it started again. So for me just starting out in first gear with normal acceleration, as soon as I reach 3k rpms it will no longer hold and air will expel. The only way to avoid it is to give it more gas.
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1,784 Posts
I would consult your tuner as it sounds like one of your tables need to be adjusted up .. I had a few of these surging tunes as we progressed in our tuning of my car.. Not a bad thing just being safe and taking baby steps as the car is making good power it will need to be tweaked.. and by tweaked I mean you tune limits adjusted .. Or I Could be wrong . Still ask your tuner he is the go to guy (or gal) here for you.. 
I am just guessing based on my own tuning experiance which is getting a map and loading it and datalogging it.. I do not do much if any messing around in the ATR software as of yet.. (no time yet)
I am just guessing based on my own tuning experiance which is getting a map and loading it and datalogging it.. I do not do much if any messing around in the ATR software as of yet.. (no time yet)
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Yes well I did pick one of the best tuners in the country to tune it. William from delicious tuning. He tuned Ken Blocks car. Yea I have the atr software too and would be awesome if I knew what I was doing. Yeah I was there for 9 hours because the ecu would default back to factory when he tried to adjust the parameters. I picked up almost 25 wtq and 4hp. He tuned it more towards acceleration and less top end. Thank you for the help and I did data log earlier and will submit it to him on Monday.
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Thank you and also I asked Bill what was the status of the fist handling e85 and he said it shouldn't be any issues. I can either get an e85 tune or wait for the flex fuel system to release mid summer and run e85 then. He estimates a gain of 40hp from that.
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7 Posts
I recently noticed that after 4500 rpm I loose boost. Down to about 14psi by redline. Has anyone else noticed this? Is it normal or could I have a leak...
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282 Posts
What is it showing as peak boost, if its only 14psi then you have a boost leak for sure. Not too sure how the Cobb tuner works but with the mountune mTune it still uses the overboost feature so you will get 21 of 22 psi of boost but then back off on the boost until your next shift of gear.
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Yea it does hit 20-21 but then trails off as RPM climbs. On Cobb stage 1.
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282 Posts
Sounds normal to me, don't know for sure but I'm thinking Cobb uses the over boost feature as well, which basically means you get peak boost and it starts to ramp the boost down to the safer levels so that your not allowing too much boost for too long to be produced and thus protect the engine and turbo.
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