Can I log correct MAP at high load?
Jan 21, 2011, 09:26 PM
#1
Evolving Member
Thread Starter
Can I log correct MAP at high load?
I'm sorry if this is a faq.
I'm just struggling to eliminate P1235 during WOT and adjust the boost level. I wish to log the MAP at high load level, but couldn't find it.
First I logged mode23 'MAP' by evoscan, but it was a byte value(It can handle from 0 to 255). And the formula was * 0.49, maximum was 124.95kPa around load 120, boost level 0.2bar.
(Though I don't know why the default range set 0-126??, I changed it to 0-255. Drawing some plots, It seems correct but stil no useful.
)
Then, I logged by pcmscan, but it was a byte value, too. But the maximum value was extended to 255kPa around load 245, boost level 1.5bar. I'm disappointed.
Can I log the MAP at more high load and boost level? Anyone found another mode23 address or any way? (JDM 52360018)
Thanks.
I'm just struggling to eliminate P1235 during WOT and adjust the boost level. I wish to log the MAP at high load level, but couldn't find it.
First I logged mode23 'MAP' by evoscan, but it was a byte value(It can handle from 0 to 255). And the formula was * 0.49, maximum was 124.95kPa around load 120, boost level 0.2bar.
(Though I don't know why the default range set 0-126??, I changed it to 0-255. Drawing some plots, It seems correct but stil no useful.
)Then, I logged by pcmscan, but it was a byte value, too. But the maximum value was extended to 255kPa around load 245, boost level 1.5bar. I'm disappointed.
Can I log the MAP at more high load and boost level? Anyone found another mode23 address or any way? (JDM 52360018)
Thanks.
Jan 22, 2011, 01:08 AM
#3
Evolving Member
Thread Starter
Hello Golden,
By the word 'MAP', I mean the Manifold Absolute air Pressure.
You are right. By disabling P1235, we can eliminate this MIL. But, I want not to turn the safety system off. Instead of it, I want to analyze the MAP and MAF items in my logs to eliminate P1235.
Though evoscan has the log item MAP, but it cannot go above 124.95.
By the word 'MAP', I mean the Manifold Absolute air Pressure.
You are right. By disabling P1235, we can eliminate this MIL. But, I want not to turn the safety system off. Instead of it, I want to analyze the MAP and MAF items in my logs to eliminate P1235.
Though evoscan has the log item MAP, but it cannot go above 124.95.
Jan 22, 2011, 04:36 PM
#5
Evolving Member
Thread Starter
Jan 22, 2011, 05:09 PM
#6
Evolved Member
iTrader: (1)
Join Date: Nov 2009
Location: Omaha, NE
Posts: 1,456
Likes: 0
Received 0 Likes
on
0 Posts
What ROM ID are you running? I can get you the Mode 23 "Boost / PSIG" address.
We measure boost by taking the MAP reading and subtracting atmospheric pressure.
Example: MAP reads 39 psi. Barometer is at 14.5 (roughly sea level). Boost = 39 - 14.5 = 24.5 psi.
We measure boost by taking the MAP reading and subtracting atmospheric pressure.
Example: MAP reads 39 psi. Barometer is at 14.5 (roughly sea level). Boost = 39 - 14.5 = 24.5 psi.
Jan 22, 2011, 06:37 PM
#7
Evolving Member
Thread Starter
Golden,
>What ROM ID are you running? I can get you the Mode 23 "Boost / PSIG" address.
52360018, thank you.
>We measure boost by taking the MAP reading and subtracting atmospheric pressure.
I understood! You mean we can read MAP value from the mode23 "Boost / PSIG" address. That's a great news and what a fool I am.
>What ROM ID are you running? I can get you the Mode 23 "Boost / PSIG" address.
52360018, thank you.
>We measure boost by taking the MAP reading and subtracting atmospheric pressure.
I understood! You mean we can read MAP value from the mode23 "Boost / PSIG" address. That's a great news and what a fool I am.
Trending Topics
Jan 23, 2011, 12:35 AM
#8
Evolved Member
Hello Golden,
By the word 'MAP', I mean the Manifold Absolute air Pressure.
You are right. By disabling P1235, we can eliminate this MIL. But, I want not to turn the safety system off. Instead of it, I want to analyze the MAP and MAF items in my logs to eliminate P1235.
Though evoscan has the log item MAP, but it cannot go above 124.95.
By the word 'MAP', I mean the Manifold Absolute air Pressure.
You are right. By disabling P1235, we can eliminate this MIL. But, I want not to turn the safety system off. Instead of it, I want to analyze the MAP and MAF items in my logs to eliminate P1235.
Though evoscan has the log item MAP, but it cannot go above 124.95.
Disabling it is easier.
Jan 23, 2011, 06:37 AM
#9
Evolving Member
Thread Starter
Hello kozmic27,
>Raising your aiflow check table values will eliminate the 1235. If you raise it in an amount relative to your power/torque increase you should be good. 30% around peak torque should be about right.
Thank you for your detailed instructions.
I'm going to edit the airflow/torque check tables(around P1235 occurred area), and run on the next Sunday.
FYI:
That day, During WOT from 2500 rpm, P1235 occurred(red arrow) close to 3000 rpm.
Since I logged 1-byte MAP, the values kept 124.95(maximum). So I want to make sure whether the MAP meter had relationship to the error.
>Raising your aiflow check table values will eliminate the 1235. If you raise it in an amount relative to your power/torque increase you should be good. 30% around peak torque should be about right.
Thank you for your detailed instructions.
I'm going to edit the airflow/torque check tables(around P1235 occurred area), and run on the next Sunday.
FYI:
That day, During WOT from 2500 rpm, P1235 occurred(red arrow) close to 3000 rpm.
Since I logged 1-byte MAP, the values kept 124.95(maximum). So I want to make sure whether the MAP meter had relationship to the error.
Jan 25, 2011, 02:14 AM
#15
Evolving Member
Thread Starter
tephra,
No temperature compensations for the Airflow/Torque check tables?
kozmic27,
Thank you for your sample pic. It helps me to edit these tables.
No temperature compensations for the Airflow/Torque check tables?
kozmic27,
Thank you for your sample pic. It helps me to edit these tables.
Last edited by crimson red; Jan 25, 2011 at 02:19 AM.