Turbo 5.3 possible tune issues
05-16-2018, 06:06 PM
#22
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To get the reading you subtract barometric pressure in my particular area around 95-100kpa is 0 vacuum. My boost gauge reads 10psi peak. My tune shows 135kpa at Max boost 135-100 is 35kpa which is roughly 5psi definitely something off.
Last edited by bbowerman; 05-16-2018 at 06:12 PM.
05-16-2018, 06:10 PM
#23
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Okay guys had the wrong map sensor logging (2bar) It was the vcm scanner I redid it and it now shows 164kpa is Max boost. So I scaled the boost enrich way up because I was seeing incorrect info pulled fuel out of the boost enrich about to test my theory. EDIT that was the issue, it was going rich and trying to foul the plugs going into the 10afr at 4psi and it kept getting richer on the way up so it felt weak up top, then I was having to free rev it to clean the plugs afterwards. Now to add a little timing.
Last edited by bbowerman; 05-16-2018 at 07:49 PM.
05-16-2018, 08:46 PM
#26
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I know right, I hate that. I usually try to break it down where it is easier on the eyes. Guess I'm gonna hook up the methanol and start doing some more work. I appreciate all the insight. Who knows maybe this thread will help someone else.
05-16-2018, 10:13 PM
#27
Originally Posted by Fuhnortoner
70kPa at Idle? So youre boosting at idle?
If you meant -70kPa you have a vacuum leak.
If you truly meant 70kPa, your MAP sensor is probably fucked, or the calibration for it is fucked. If youre MAP says youre boosting 130 and your boost gauge says 10psi, youre probably dumping too much fuel, which explains the power loss and backfiring.
If you meant -70kPa you have a vacuum leak.
If you truly meant 70kPa, your MAP sensor is probably fucked, or the calibration for it is fucked. If youre MAP says youre boosting 130 and your boost gauge says 10psi, youre probably dumping too much fuel, which explains the power loss and backfiring.
For the op, do key on engine off and see what the map reads. Should be right around 100kpa, if not I'd double check the values you have for the map offset.
Oops I guess I should have kept reading, didn't realize it was already fixed.
05-17-2018, 07:12 AM
#28
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Lol -70kpa? 70kpa is still vacuum, I'm not sure you understand how kpa works.
For the op, do key on engine off and see what the map reads. Should be right around 100kpa, if not I'd double check the values you have for the map offset.
Oops I guess I should have kept reading, didn't realize it was already fixed.
For the op, do key on engine off and see what the map reads. Should be right around 100kpa, if not I'd double check the values you have for the map offset.
Oops I guess I should have kept reading, didn't realize it was already fixed.
Last edited by Fuhnortoner; 05-17-2018 at 07:18 AM.
05-17-2018, 09:57 AM
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Ok so I admit i was wrong about kPa. I understand it now. But I did call it.
So put that in your pipe and smoke it.
70kPa at Idle? So youre boosting at idle?
If you meant -70kPa you have a vacuum leak.
If you truly meant 70kPa, your MAP sensor is probably fucked, or the calibration for it is fucked. If youre MAP says youre boosting 130 and your boost gauge says 10psi, youre probably dumping too much fuel, which explains the power loss and backfiring.
If you meant -70kPa you have a vacuum leak.
If you truly meant 70kPa, your MAP sensor is probably fucked, or the calibration for it is fucked. If youre MAP says youre boosting 130 and your boost gauge says 10psi, youre probably dumping too much fuel, which explains the power loss and backfiring.
So put that in your pipe and smoke it.
