SD or MAF (yes I've searched!)
#1
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SD or MAF (yes I've searched!)
Hi everyone,
Maybe I'm just really dense, but I've searched this site and others and I'm still confused, - SD tune or MAF? I see the advantages of a SD tune (and like it!), and a MAF but what are the dis-advantages? Specs on my build - 5.7 LS1, JE pistons (10.6 CR), eagle rods, Comp cam 54-458-11 and supporting hardware, ported 799's, LS6 intake, long tube "swap" headers, all being stuffed in a light weight 944. 80% street driven, with some road race track time. I want to start with a "tuned by Frost" ECU (mail order...I know it sounds scary, but lots of great reviews!!) to get it close then final tune on a dyno after a few 100 miles to break it in. Comments or advice is welcome and appreciated!
Cheers,
Gord.
Maybe I'm just really dense, but I've searched this site and others and I'm still confused, - SD tune or MAF? I see the advantages of a SD tune (and like it!), and a MAF but what are the dis-advantages? Specs on my build - 5.7 LS1, JE pistons (10.6 CR), eagle rods, Comp cam 54-458-11 and supporting hardware, ported 799's, LS6 intake, long tube "swap" headers, all being stuffed in a light weight 944. 80% street driven, with some road race track time. I want to start with a "tuned by Frost" ECU (mail order...I know it sounds scary, but lots of great reviews!!) to get it close then final tune on a dyno after a few 100 miles to break it in. Comments or advice is welcome and appreciated!
Cheers,
Gord.
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A good MAF tune will be more versatile in severe weather or altitude changes and with the ls6 intake a GM 85mm MAF with a Saxon screen will not be an airflow restriction.
The biggest benefit to SD for your setup would be giving you more options for air ducting routing since you don't have to worry about turbulence affecting MAF readings.
The biggest benefit to SD for your setup would be giving you more options for air ducting routing since you don't have to worry about turbulence affecting MAF readings.
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I live 26' above sea level, and didn't have any plans of visiting the Rocky Mountains
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#9
I had Frost do my SD tune via mail order and it turned out great. I have much better throttle response and I can ditch that MAF and run a 4" tube from my lid to my TB to fit my FAST 102 setup, resulting in no restriction. Otherwise I would need to run a 100mm MAF which is first pretty expensive for just buying the part and the tuning cost is the same as tuning for SD if not more. To me it makes more sense to run a SD setup with something like my setup where the MAF even in the 85mm could be a restriction because your lid, TB, and intake are all 104/102/102mm. IMHO the benefits of SD outweigh the cons. I live at 300' sea level or lower around where I am though so that may make a difference.
#10
#12
Anyway thread jack... an 85mm maf would do you well with that setup, or SD. I find maf more accurate though, copes with heatsoak and changing temps better. That IAT/ECT bias and getting an accurate IAT reading in the first place is the thorn in the side of SD tunes.
Your LS6 intake has a ~75mm neck, so an 85mm maf won't cost much power. If going FAST 102 etc then SD makes sense IMO.
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