What point do I monitor for line PSI on ATAP?
02-01-2002, 10:31 PM
#1
What point do I monitor for line PSI on ATAP? I am wanting to do some testing on ported MAFs and the screened Pace 85 mm MAF in correlation with the line trans line pressure.What points will indicate line pressure activity? My Pace 85 mm screened MAF has proven increased performance over the stock piece, but also gives +10-14 Ltrms at cruise with MAFT @ 0-0. I am wondering if it is actually calibrated. The comparison tests will
determine this. Patrick G? Anyone?
Thanks.
determine this. Patrick G? Anyone?
Thanks.
02-13-2002, 12:54 AM
#3
Re: What point do I monitor for line PSI on ATAP? You want to check the L-Trims at WOT. At cruise, they will fluctuate quite a bit. Unless they're close to 0%, the MAF is not very well calibrated.
If you are getting 10-14% positive L-Trims, then you are probably getting 10-14% less load being calculated by the pcm. You will gain 3-4 degrees of timing (which is probably why you found the performance gain and not from increased airflow).
Check the trans pressure setting on A-Tap or better yet, check it will a real pressure gauge with your MAFT on 0-0. After you have good readings (at cruise and WOT), adjust the MAFT until you have 0% L-Trims then re-check trans line pressure. Let us know what you find out.
Patrick
If you are getting 10-14% positive L-Trims, then you are probably getting 10-14% less load being calculated by the pcm. You will gain 3-4 degrees of timing (which is probably why you found the performance gain and not from increased airflow).
Check the trans pressure setting on A-Tap or better yet, check it will a real pressure gauge with your MAFT on 0-0. After you have good readings (at cruise and WOT), adjust the MAFT until you have 0% L-Trims then re-check trans line pressure. Let us know what you find out.
Patrick
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
