SD or MAF TUNE
Burning Brakes
Joined: Apr 2009
Posts: 946
Likes: 2
Nothing wrong with running SD on the street, I've been doing it for years in the TT truck where the MAF is nothing but a restriction to airflow 
.
That said, I'll be running a MAF with the C5 tune (after locking in the VE table, natch)
.That said, I'll be running a MAF with the C5 tune (after locking in the VE table, natch)
Racer
Joined: Jun 2006
Posts: 336
Likes: 0
From: Raymond Mississippi
Pro
Joined: Mar 2007
Posts: 507
Likes: 5
From: Macungie Pa
My tuner has me in SD and I'm still fighting issues. Going back tomorrow for some follow-up. Off idle to 2k, some sputtering and hesitation. 2200 on up including WOT seem fine. Any extended idling at all will start to load up. Already burned up a set of free flows...
Can cruise at 60 mph and watch the fuel gauge drop.
See what happens tomorrow.
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
This is what I did. Put it in SD mode and iterate until you get it dead on. Then revert to closed-loop mode and tune trims in. My heads cam setup ran much better after.
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Melting Slicks
Joined: Jul 2000
Posts: 2,541
Likes: 0
From: Chicago
Air density changes with temperature and humidity. If you're car is mainly street driven in a variety of atmospheric conditions then a speed density tune doesn't make sense. Also dialing in the VE in open loop is an unnecessary step in the tuning process if your utilizing the MAF. As is chasing fuel trims. Keep your MAF enabled and focus on dialing in your enrichment rate and main spark tables.