Speed density tune????
SD is easy for someone that knows what they are doing but for a newbie that doesn't want to spend a ton of hours researching can be hard.
You can tune a full SD in 1 shot if you know what your doing.You would want to run your highest boost level when tuning so you can set all the tables right the first time. Keep in mind that you can blow up a motor very quickly if your not carefull.
You can tune a full SD in 1 shot if you know what your doing.You would want to run your highest boost level when tuning so you can set all the tables right the first time. Keep in mind that you can blow up a motor very quickly if your not carefull.
Originally Posted by Slowhawk
SD is easy for someone that knows what they are doing but for a newbie that doesn't want to spend a ton of hours researching can be hard.
You can tune a full SD in 1 shot if you know what your doing.You would want to run your highest boost level when tuning so you can set all the tables right the first time. Keep in mind that you can blow up a motor very quickly if your not carefull.
You can tune a full SD in 1 shot if you know what your doing.You would want to run your highest boost level when tuning so you can set all the tables right the first time. Keep in mind that you can blow up a motor very quickly if your not carefull.
Originally Posted by longrange4u
For those of us who really dont know... can someone do a detailed explanition of why a SD tune is so much more valuble than the standard MAF tune for us FI guys?
Thanks!!
I dont know the specifics on how the SD tune works, just that your not restricted by airflow.
For what its worth our LS1 brothers down in Austrailia run nothing but speed density tunes down there. They said you get better driveabilty, mileage and more power.
its a no brainer for me, I'm just a little tight on bills right now.
its a no brainer for me, I'm just a little tight on bills right now.
Staging Lane
Joined: Sep 2005
Posts: 79
Likes: 0
From: Ft Collins, Colorado
A Speed Density tune works by measuring RPM vs manifold preassure, that way if your set up with a 2 or 3 bar map sensor it doesnt matter what psi your running, your ve table will be tuned acordingly.
I have been working on my 2 bar SD tune forever. BUT, that's only because I haven't had time to drive the car. The help section in HPT will help you set it up, then it's just a matter of driving and logging data. You just don't want to make big changes, make small changes at a time to make sure you don't go lean. As someone mentioned above, you can get it done in one shot, but you would have to drive for a while to make sure you have enough reliable data.
The hardest part I have had is just getting enough data in boost regions. And it's best to get that data by running through 4th gear. If your not on a dyno, you need a really long empty stretch of road.
By the way, to the thread starter, you cannot just unplug the MAF, and change the MAP. Make sure you change the pcm's operating system to read 2 or 3 bar. That is what HP Tuners is for.
The hardest part I have had is just getting enough data in boost regions. And it's best to get that data by running through 4th gear. If your not on a dyno, you need a really long empty stretch of road.
By the way, to the thread starter, you cannot just unplug the MAF, and change the MAP. Make sure you change the pcm's operating system to read 2 or 3 bar. That is what HP Tuners is for.
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Verdad Gallardo Hmmmm NYSS good info bro. So I could do a baseline load with a couple of runs on the dyno. Then continue updates as I run her in varying levels of boost? I get the AF ratio requirements and where you want to keep them through all levels of boost... Can someone talk smartly about timing and retard of timing? How and why? Where does that come into play with a SD tune?
I'm actually working on the timing part now. I wish I had a better explanation for it, but start low...keep adding a little at a time, and look for knock. It's always good to do a little research, and see what other people are running with similar boost levels. But I'll tell ya, this would be a hell of a lot easier on a mustang dyno. In any event, there are 2 timing tables. One is for hi octane, and one for low octane (referenced if there is knock). According to the help files in HPT, you make them both the same. I have seen a little knock during my tuning, and it will still pull some timing, so need to be worried about that. Although, I haven't figured out how the pcm knows to pull timing if the low octane table is the same as the hi octane!
The cool thing about the 2 bar HPT setup is you can have different afr's for whatever boost levels you want. If you want it to richen up past 5 psi, you can do that. It really is a cool setup.
The guy with the 98...I would think that if you're running higher than 14-15 psi, you could set up the higher levels of the ve table to accomodate the higher boost levels. You would be running rich at 14 psi, but then it will be correct at your final boost level. Kind of the same way you would trick the pcm if we didn't have 2 bar tuning. It's not optimal, but it gets the job done.
The cool thing about the 2 bar HPT setup is you can have different afr's for whatever boost levels you want. If you want it to richen up past 5 psi, you can do that. It really is a cool setup.
The guy with the 98...I would think that if you're running higher than 14-15 psi, you could set up the higher levels of the ve table to accomodate the higher boost levels. You would be running rich at 14 psi, but then it will be correct at your final boost level. Kind of the same way you would trick the pcm if we didn't have 2 bar tuning. It's not optimal, but it gets the job done.
Sooo... when you are looking at the HPTuners you can see when knock occurs? So is it basicly start low.... work till you see knock.. back off one click? (LOL Kinda like head spacing and timing a M2 .50 for all you Military folks!!)
Yes, in the scanner, you will see when and if you have any knock. You can then adjust the timing at a given rpm vs. dynamic cylinder air (also in the scanner). It's actually pretty cool to watch it come together, and to learn how all of these things are correlated. Good luck longrange...I'm curious to see how your car comes out.
Here ya guys go..... a little reading...
http://maftpro.com/tproinfo.shtml
Harlan Did the beta testing on LS1's for them and they can be purchased from
Stenod Performance
http://stenodracing.com/index.html
Thats what im running.......
Kyle
http://maftpro.com/tproinfo.shtml
Harlan Did the beta testing on LS1's for them and they can be purchased from
Stenod Performance
http://stenodracing.com/index.html
Thats what im running.......
Kyle
Originally Posted by MiaSSmaro98
so the maftpro is like a afc is to imports?also if u have this does the factory ecm still need tuning?
yes it does. Timing is one big things that comes to mind LOL