|
Software Tuning Discuss all software tuning topics. |
|
Thread Tools | Search this Thread |
09-29-2021, 02:41 PM | #1 |
Senior Member
Join Date: Jun 2021
Drives: 2015 FR-S
Location: San francisco
Posts: 356
Thanks: 144
Thanked 154 Times in 101 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
|
Idle MAP reading ~4psi but P3Gauge reading -20inHg
Looking for some help on this weird discrepancy between ECUTEK logging of MAP reading vs my P3Gauge.
I have a Edelbrock SC with Delicious tuning with D-Box smoothie. If you see my below log during idle the MAP sensor is reading ~4psi instead of vacuum. interesting enough my P3gauge reading ODB2 sees ~ -20inHg which is more in line. I'm wondering why there's this discrepancy. Is there something in Delicious tuning that offsets the MAP during ECUTEK logging? which one is correct? https://datazap.me/u/s0007/2k-6k-pulls?log=0&data=7-23 |
09-29-2021, 05:50 PM | #2 |
LMGTFY
Join Date: Mar 2016
Drives: 13 FRS, 91 Miata
Location: Lava Town, HI
Posts: 2,776
Thanks: 5,561
Thanked 3,646 Times in 1,625 Posts
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
|
Stock MAP sensor?
|
09-29-2021, 06:30 PM | #3 |
Senior Member
Join Date: Jun 2021
Drives: 2015 FR-S
Location: San francisco
Posts: 356
Thanks: 144
Thanked 154 Times in 101 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
|
The edelbrock SC kit includes a 2 bar Bosch TMAP sensor. Even though both the P3Gauge and ECUTEK is reading from ODB2 I'm wondering if one is relative while the other is absolute. Spoke with P3 and they said even though the gauge is digital, vacuum is always displayed in -inHg while positive is in PSI
-20inHg is roughly -9.8psi. So if that's -9.8psi relative to atmospheric then 14.4-9.8 is roughly 4.9psi absolute. Not sure if this is correct assumption but welcome feedback here. |
09-29-2021, 08:05 PM | #4 | |
Banned
Join Date: Dec 2013
Drives: FT86
Location: Australia
Posts: 7,998
Thanks: 1,035
Thanked 4,987 Times in 2,981 Posts
Mentioned: 598 Post(s)
Tagged: 2 Thread(s)
|
Quote:
Turn ignition full on , but engine off, map srnsor or guage should read 14 psi or 1 bar ie atmospheric if absolute or. 0 psi 0 bar if reliative Also depends if your looking at reliative pressure or absolute id say your reading reliative on one and absolute on the other |
|
The Following User Says Thank You to steve99 For This Useful Post: | FrickingReallySlow (09-30-2021) |
09-30-2021, 03:27 AM | #5 |
Senior Member
Join Date: Jan 2017
Drives: brz 2017 hksv2
Location: italy
Posts: 2,183
Thanks: 499
Thanked 1,059 Times in 769 Posts
Mentioned: 64 Post(s)
Tagged: 0 Thread(s)
|
yep looks ok
|
The Following User Says Thank You to tomm.brz For This Useful Post: | FrickingReallySlow (09-30-2021) |
10-02-2021, 06:06 PM | #6 |
Senior Member
Join Date: Jun 2017
Drives: BRZ Yellow, 2019 Ranger, 2011 Evora
Location: Dallas
Posts: 1,682
Thanks: 352
Thanked 1,473 Times in 770 Posts
Mentioned: 14 Post(s)
Tagged: 1 Thread(s)
|
No discrepancy, engine computers calculate from absolute pressure. Relative pressure means nothing when calculating amount of fuel needed.
|
The Following User Says Thank You to Grady For This Useful Post: | FrickingReallySlow (10-08-2021) |
10-08-2021, 03:33 PM | #7 | |
Senior Member
Join Date: Jun 2021
Drives: 2015 FR-S
Location: San francisco
Posts: 356
Thanks: 144
Thanked 154 Times in 101 Posts
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
|
Thx got the gauge to stay on with engine off and it reads 0 PSI.
Quote:
|
|
|
|
Thread Tools | Search this Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Need Help Reading ECU | Eddy98 | Software Tuning | 1 | 12-21-2020 03:59 AM |
OFT not reading ECU | Gray Fox | Software Tuning | 12 | 08-02-2017 06:44 PM |
What is the expected vacuum reading at idle? | qtwre | Forced Induction | 20 | 05-03-2017 10:27 PM |
Reading Vin # | Knightmare | BRZ First-Gen (2012+) -- General Topics | 2 | 11-16-2012 01:26 PM |