PROS & CONS OF SD TUNING
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From: arlington aka aggtown
PROS & CONS OF SD TUNING Ok guys what is the pros and cons and yes i've searched yet really dont understand how this works and i live in texas were the weather always changes so let me know guys
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From: Lake Zurich, IL
search this forum and you'll find lots of posts 
(search terms "SD MAF")
but in my case...
SD tuning .. easy.... car runs good... if i went back to a MAF i'd have to recal my MAF
temp/alt have minimal effects on SD tuning...
and ... you need to allow more than an hour or so between replyes
(search terms "SD MAF")but in my case...
SD tuning .. easy.... car runs good... if i went back to a MAF i'd have to recal my MAF
temp/alt have minimal effects on SD tuning...
and ... you need to allow more than an hour or so between replyes
SD is nice if your tune is accurate, and you retune whenever you mod. MAF is more tolerant of learning mods. SD removes the MAF as a restriction, but if you calibrate a ported MAF, its just as good. On camed cars, the stock MAF calibration does not take into consideration low RPM reversion. The other side of the coin is that the MAF seems to smooth out my low rpm low load bucking (caused by my cam) that hapens at steady MAP. If you have the OBD-II scan, youll need the MAF to pass. I run with a MAF, but I spend most of my time Tuning the VE tabel MAFless.
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Originally Posted by eric01ss
How much does sd tune cost compared to regular tune brandon
Cost should not be a factor here. Just talk to the guy about what you want. Some tuners perfer one or the other.
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Originally Posted by eric01ss
How much does sd tune cost compared to regular tune brandon
Hey Brandon hwo are you going to pass inspection are you just going to get the sniffer done? Or are things different where you're at? I want an SD tune when I get the cam put in but that's the onlything I've got stopping me.
Originally Posted by 01 Red WS6
Hey Brandon hwo are you going to pass inspection are you just going to get the sniffer done? Or are things different where you're at? I want an SD tune when I get the cam put in but that's the onlything I've got stopping me.
Originally Posted by GuitsBoy
The stock MAF table was off +/- 30% on my car after I tuned my VE. Unlikely it would pass smog with that kind of incorrect fueling.
The good news is that it ran great in SD mode without the MAF after the VE was tuned with an LC1 wideband/HPT 2.0 EIO.
Rob (Bad30th)
Originally Posted by Bad30th
...unless your MAF table is so jacked that the car doesn't run right after the VE is tuned, like my car did.
The stock MAF table was off +/- 30% on my car after I tuned my VE. Unlikely it would pass smog with that kind of incorrect fueling.
The good news is that it ran great in SD mode without the MAF after the VE was tuned with an LC1 wideband/HPT 2.0 EIO.
Rob (Bad30th)
The stock MAF table was off +/- 30% on my car after I tuned my VE. Unlikely it would pass smog with that kind of incorrect fueling.
The good news is that it ran great in SD mode without the MAF after the VE was tuned with an LC1 wideband/HPT 2.0 EIO.
Rob (Bad30th)
I should have specified that the tuner may need to calibrate your MAF table and do some hand interpolation, but this shouldnt take long. A short log file and abut 5 minutes tweaking the bin will get it close enough.
When you pull the plug on the MAF, it defaults back to SD mode
Teching In
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Good article...
It sums up basically what I'll tell people from the start with SD tuning...if you aren't competent with your tuning software, don't even mess with it. You need to make changes to the tune for almost every single engine modification you make. If you aren't willing to do that, keep the MAF.
As for me, my engine is deaf, dumb, and blind. It only does what I tell it (I run a full time Open Loop SD tune).
It sums up basically what I'll tell people from the start with SD tuning...if you aren't competent with your tuning software, don't even mess with it. You need to make changes to the tune for almost every single engine modification you make. If you aren't willing to do that, keep the MAF.
As for me, my engine is deaf, dumb, and blind. It only does what I tell it (I run a full time Open Loop SD tune).
So supposely one has hptuners and wideband.
I go into MAF-less mode, tune the car in SD mode using this wonderful write up ( http://texasfbody.org/hpt/SDTuningVE/ ) to get that 13.0 AFR.
Then what ? I plug the MAF back in, but now it needs to be tuned with MAF....How do I do that ?
I go into MAF-less mode, tune the car in SD mode using this wonderful write up ( http://texasfbody.org/hpt/SDTuningVE/ ) to get that 13.0 AFR.
Then what ? I plug the MAF back in, but now it needs to be tuned with MAF....How do I do that ?
How I did mine was : Log with HPT to get Maf Hz and dynamic air. Use the AUTOMAF spreadsheet RedHardSupra put together (in the forum stickies), and/or if you have a wideband you can use the MAF AFR error % histogram to adjust your MAF table.
There's lots of good reading in those stickied posts.
Rob (Bad30th)
There's lots of good reading in those stickied posts.
Rob (Bad30th)