tuning question
tuning question I know most recommend tuning in SD then reconnecting MAF and rescaing MAF tables, but what will it hurt just tuning VE going by LTFT alone ? I mean without SD and having to mess with the MAF tables, just tuning by LTFT and leaving everyting else alone. Thanx
Often, you have L-Trim fluctuations because your MAF is not matched perfectly to your VE tables. In SD mode, you turn off the MAF so you can concentrate on getting your L-Trims back to 0%. Problem occurs once you plug the MAF back in. Your MAF will still be operating off the old values and not re-scaled to agree with the revised VE tables. This conflict will throw your L-Trims back to the direction of the original MAF scale. All your work will be for nothing.
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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.
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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.
but any discrepancies can be fudged tuning the VE table, end result being the same why would using SD/MAF rescale be better than just tuning VE alone with everythig else as is ? thanx for your input by the way
Teching In
Joined: Aug 2005
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Originally Posted by oange ss
but any discrepancies can be fudged tuning the VE table, end result being the same why would using SD/MAF rescale be better than just tuning VE alone with everythig else as is ? thanx for your input by the way
Teching In
Joined: Jun 2005
Posts: 14
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Originally Posted by oange ss
but any discrepancies can be fudged tuning the VE table, end result being the same why would using SD/MAF rescale be better than just tuning VE alone with everythig else as is ? thanx for your input by the way
Injector flow rates, MAF flow rates, MAP sensors all have a little bit of error. So by doing SD tuning (O2's ensure correct AFR's) and then rescaling the MAF you maintain the correct AFR's (and therefore fuel metering) which is the name of the game...
If you do SD tuning and then go back and change your VE your AFR's will be out...
