Iat
Thanks for looking, I really appreciate it.
Predator, really sorry for the hi-jack... and to really answer your question... I'm nearly 100% sure that at WOT with HIGH IATs you will lose up to a MAX of 3 degress on stock tuning. Since it's so far at the end of the MAP, it should only affect WOT or very heavy throttle. If you are N/A this should hardly be noticeable if at all.
Predator, really sorry for the hi-jack... and to really answer your question... I'm nearly 100% sure that at WOT with HIGH IATs you will lose up to a MAX of 3 degress on stock tuning. Since it's so far at the end of the MAP, it should only affect WOT or very heavy throttle. If you are N/A this should hardly be noticeable if at all.
Well it is IAT like i thought. Attached is a screen shot and here are the values for the adder table. It starts at -40C and goes to 140C in increments of 10C.
-0.1767 0.0001 0.0087 -0.8549 1.0828 0.0000 0.0000 0.0000 0.0004 1.2499 1.1874 0.0000 0.0000 0.0161 0.1805 0.0473 -1.8785 0.2850 0.2800
My IAT MAp table is attached too with the values filled in with a stock PCM.
-0.1767 0.0001 0.0087 -0.8549 1.0828 0.0000 0.0000 0.0000 0.0004 1.2499 1.1874 0.0000 0.0000 0.0161 0.1805 0.0473 -1.8785 0.2850 0.2800
My IAT MAp table is attached too with the values filled in with a stock PCM.
Last edited by brad8266; Feb 1, 2007 at 05:44 PM.
Originally Posted by brad8266
Well it is IAT like i thought. Attached is a screen shot and here are the values for the adder table. It starts at -40C and goes to 140C in increments of 10C.
-0.1767 0.0001 0.0087 -0.8549 1.0828 0.0000 0.0000 0.0000 0.0004 1.2499 1.1874 0.0000 0.0000 0.0161 0.1805 0.0473 -1.8785 0.2850 0.2800
My IAT MAp table is attached too with the values filled in with a stock PCM.
-0.1767 0.0001 0.0087 -0.8549 1.0828 0.0000 0.0000 0.0000 0.0004 1.2499 1.1874 0.0000 0.0000 0.0161 0.1805 0.0473 -1.8785 0.2850 0.2800
My IAT MAp table is attached too with the values filled in with a stock PCM.
Originally Posted by 2xLS1
Figure out what -40C and 140C are in F and let us know if you still think that table is still referencing air temp.
The IAT adder table has the same range and increments as the coolant temp adder table does too. I guess the coolant table must be referencing something else too.
Last edited by brad8266; Feb 1, 2007 at 06:21 PM.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Originally Posted by brad8266
Well it is IAT like i thought. Attached is a screen shot and here are the values for the adder table. It starts at -40C and goes to 140C in increments of 10C.
-0.1767 0.0001 0.0087 -0.8549 1.0828 0.0000 0.0000 0.0000 0.0004 1.2499 1.1874 0.0000 0.0000 0.0161 0.1805 0.0473 -1.8785 0.2850 0.2800
My IAT MAp table is attached too with the values filled in with a stock PCM.
-0.1767 0.0001 0.0087 -0.8549 1.0828 0.0000 0.0000 0.0000 0.0004 1.2499 1.1874 0.0000 0.0000 0.0161 0.1805 0.0473 -1.8785 0.2850 0.2800
My IAT MAp table is attached too with the values filled in with a stock PCM.
Dude LOOK at those values.... It IS AN ADDER TABLE, and it *MUST* not be active. -1.875???? -0.8549??? +1.24999??? and what the hell kind of curve is that anyway... A HUGE negative number and huge positives randomly stuck around each other... A PE of 1.176 is about 12.5:1 on a properly tuned car. Look at how bad those values would murder the table...
FWIW I have found that moving the PE table beneath 1 ceases to pull fuel at WOT. I have seen it trying to chop out something quick after adding pumps and having lots of rail pressure; and there are values there pulling way beneath 1.0.
Here are some caps from an 00 Z and an 01 TA, the 01 has the table:
Originally Posted by Frost
The range is the same since both sensors use thermistors that have the same characterisitc curve (in reference to your other last post).
Dude LOOK at those values.... It IS AN ADDER TABLE, and it *MUST* not be active. -1.875???? -0.8549??? +1.24999??? and what the hell kind of curve is that anyway... A HUGE negative number and huge positives randomly stuck around each other... A PE of 1.176 is about 12.5:1 on a properly tuned car. Look at how bad those values would murder the table...
FWIW I have found that moving the PE table beneath 1 ceases to pull fuel at WOT. I have seen it trying to chop out something quick after adding pumps and having lots of rail pressure; and there are values there pulling way beneath 1.0.
Dude LOOK at those values.... It IS AN ADDER TABLE, and it *MUST* not be active. -1.875???? -0.8549??? +1.24999??? and what the hell kind of curve is that anyway... A HUGE negative number and huge positives randomly stuck around each other... A PE of 1.176 is about 12.5:1 on a properly tuned car. Look at how bad those values would murder the table...
FWIW I have found that moving the PE table beneath 1 ceases to pull fuel at WOT. I have seen it trying to chop out something quick after adding pumps and having lots of rail pressure; and there are values there pulling way beneath 1.0.
Originally Posted by Frost
Can anyone else with an 01/02 F-body tune look at the PE vs. IAT table and let me know if it is populated with anything other than zeros? Thanks.
subscribed. great topic!
EDIT: Bill, this is the exact type of thing i was hoping to have put into a future version for the v6 crowd...if possible. (well at least in the 2002 fbody's...hahaha)
EDIT: Bill, this is the exact type of thing i was hoping to have put into a future version for the v6 crowd...if possible. (well at least in the 2002 fbody's...hahaha)
Originally Posted by Frost
Thanks warp_6.
Brad, I'll be intrested to know what you find.... that table can't possibly be active given it's population
Brad, I'll be intrested to know what you find.... that table can't possibly be active given it's population
Originally Posted by 2xLS1
Figure out what -40C and 140C are in F and let us know if you still think that table is still referencing air temp.
Oh yeah... I missed this post... Brad something is definitely amiss. Thermistors read a scale of -40 to 140... but it is NOT in C, it's in F. 140C is around 270degF !!! That's damn near twice what the upper end of the range for that sensor is...
That table is DEFINITELY not scaled in C.
!doh! I posted a screenie of the table above 
I dunno....
Edit
and so Foff, what do you think of those outrageous adder values Brad found in his 00 table (that I can't get to even with his same verison of edit...) It SURELY cant be active...
I dunno....Edit
and so Foff, what do you think of those outrageous adder values Brad found in his 00 table (that I can't get to even with his same verison of edit...) It SURELY cant be active...