Will someone look at my datalog's. Need to compare MAP readings. PLEASE LOOK!
03-25-2005 | 06:20 PM
#1
Thread Starter
Registered User
Joined: Apr 2003
Posts: 892
From: Dallas/Fort Worth
Will someone look at my datalog's. Need to compare MAP readings. PLEASE LOOK!
I have been trying to track down a issue with my T/A not running right since I built the engine.
After looking at Injueer site (http://members.aol.com/InjuneerZZ/Sc....htm#step%2020)
it looks like the map reading should go below 10 at idle when the BAR is 30. My bar is around 30 but the map stays around 17 at idle
That seems then if you take the 30 and subtract the 17 that I am only pulling 13" of vaccum rather then the 20 as mentioned on the site.
Can anyone look at these graphs and lemme know what you think about this idea?
datamaster format:
http://www.triplecfeeders.com/images...talog/scan.uni
excel format:
http://www.triplecfeeders.com/images...talog/scan.csv
After looking at Injueer site (http://members.aol.com/InjuneerZZ/Sc....htm#step%2020)
it looks like the map reading should go below 10 at idle when the BAR is 30. My bar is around 30 but the map stays around 17 at idle
That seems then if you take the 30 and subtract the 17 that I am only pulling 13" of vaccum rather then the 20 as mentioned on the site.
Can anyone look at these graphs and lemme know what you think about this idea?
datamaster format:
http://www.triplecfeeders.com/images...talog/scan.uni
excel format:
http://www.triplecfeeders.com/images...talog/scan.csv
03-26-2005 | 12:04 AM
#3
Administrator
Joined: Nov 1998
Posts: 70,853
From: Hell was full so they sent me to NJ
Re: Will someone look at my datalog's. Need to compare MAP readings. PLEASE LOOK!
You really need to read my whole writeup AGAIN. The <10"Hg MAP is exactly as jchevy said.... for a stock cam. My writeup clearly explains that you will see less vacuum (higher MAP) as idle with a more radical cam. I think I even explained this to you when you sent me several data logs to review previously.
Pretty much matches exactly what you posted.
When a stock LT1 is idling, the "MAP" reading should be about one-third of the "BAR" reading. Check the "BAR", and remember it - it won't change for a while, unless you're in the middle of a hurricane… Then display "MAP". If the BAR = 30.0, MAP should be at 10.0, or below. On my relatively stock LT1, with a BAR = 30, I would see MAP readings at idle of 9.3 to 9.5. The readings would fluctuate slightly with the idle. Maybe as low as 8.9, and maybe as high as 9.8.
If you have a cam that is more aggressive than the stocker, you will see a higher MAP reading at idle. With a fairly radical cam, you might see reading of 18 or so.
If you have a cam that is more aggressive than the stocker, you will see a higher MAP reading at idle. With a fairly radical cam, you might see reading of 18 or so.
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