what gain would you get going from maf to speed density?
07-19-2010, 08:30 PM
#2
There are no gains from a tuning advantage standpoint, but if your MAF and airbridge are a choke in your system, then gains can be had. The amount of gains depend on your power level and TB size. If the throttle body is the choke, then there are no gains by going SD. If your intake manifold and TB are oversized, then the choke many move to the MAF. This is assuming that your air box is completely free flowing and has more cfm flow potential than your throttle body.
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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.
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.
07-20-2010, 10:21 PM
#4
There are no gains from a tuning advantage standpoint, but if your MAF and airbridge are a choke in your system, then gains can be had. The amount of gains depend on your power level and TB size. If the throttle body is the choke, then there are no gains by going SD. If your intake manifold and TB are oversized, then the choke many move to the MAF. This is assuming that your air box is completely free flowing and has more cfm flow potential than your throttle body.
07-20-2010, 10:38 PM
#5
Datalog your setup. If you are constantly exceeding the 12000Hz limit of the MAF, then you should consider tuning for SD as a test. Check the log for vacuum. It its close to 100kpa, at sea level, at WOT, you have none and your MAF is not a restriction. Most cars will not exceed this value or even need SD tuning even then. If you are getting codes regarding MAF limits, then you have a good reason. This can happen at low end and top end, ie less airflow efficiencty on bottom and more on top. Also if your TB is smaller than your MAF, thats a limiting factor.
Cars with aftermarket cams basically do well with a VE tune, then MAF cleanup. With my own car I tested the MAF and SDOL variations. I got about the same power. In the end, I was smoother with SD, so left it there.
Good luck.
Cars with aftermarket cams basically do well with a VE tune, then MAF cleanup. With my own car I tested the MAF and SDOL variations. I got about the same power. In the end, I was smoother with SD, so left it there.
Good luck.
07-21-2010, 10:22 AM
#6
Start the scanner, key on engine off (KOEO), see what the kPa says for the MAP and write it down. This is not always the same number. Log a WOT run, see what the MAP kPa is, that is how you can tell if there is a restriction. If your KOEO is 100 and your WOT run is 95 you have a restriction. About 2 kPa drop is a good flowing intake system, I don't know if you could ever get 0 drop.
07-21-2010, 12:24 PM
#7
Start the scanner, key on engine off (KOEO), see what the kPa says for the MAP and write it down. This is not always the same number. Log a WOT run, see what the MAP kPa is, that is how you can tell if there is a restriction. If your KOEO is 100 and your WOT run is 95 you have a restriction. About 2 kPa drop is a good flowing intake system, I don't know if you could ever get 0 drop.
im still gathering parts i should receive by the end of august (92/92, 4" elbo, 4" strait pipe (diching the maf), Fast Toy 104 lid, SLP Cold Air System, a clean filter, ill do a before and after results and see what happens.
stock ls1 with headers and borla exhaust.
