Pro's and Con's to Speed Density Tuning on FI..
Originally Posted by mdhmi
I'm sure SD is great when done right - but FWIW I haven't had any issues with my MAF setup at 13-15 psi boost. My car runs mid 10's @ 138 MPH without meth in the summer heat on pump fuel so I can't complain.
I agree with Slowhawk and the others about how SD helps with throttle responce. I have a 6 speed and I felt a difference.
I do all my own tuning with EFI and I have a bunch to learn, but I enjoy it.
I feel one con to SD is my fuel economy went down. However, at the same time, I have not completely tuned it. At the moment the car is rich so there is some MPG to pick up once I get it figured out.
Glenn
I do all my own tuning with EFI and I have a bunch to learn, but I enjoy it.
I feel one con to SD is my fuel economy went down. However, at the same time, I have not completely tuned it. At the moment the car is rich so there is some MPG to pick up once I get it figured out.
Glenn
Originally Posted by navymitch12
so you guys that are doing all your own tuning on an SD setup how hard would you say it was to learn....and what was/is your tuning background if any?
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Originally Posted by KWIKKAR
again PRICE?
Originally Posted by KWIKKAR
thanks, thats all i wanted to know. I'll just stay with my MAF setup. 
Teching In
Joined: May 2007
Posts: 34
Likes: 0
From: J-actionville
Isn't the major problem with maf vs sd that the maf can only measure a specified amount of air, and once you go past that the pcm doesn't have the programming to continue. From what I get of it, the MAF-T is a continuation table based on throttle position that essentialy has the pcm assume what the airflow is integrating AIT. Am I understanding this correctly or am I way off?
Originally Posted by INTMD8
I have tuned many cars using HP tuners 2/3 bar OS. As far as tuning is concerned it is my favorite thing to work with and IMHO the only proper way to accurately tune a forced induction car capable of maxing out the MAF sensor.
Driveability is exceptional, much better than the MAF. Change your boost level on the fly and fueling is perfect at any setting. Just make sure you have the proper octane fuel in the tank for a given power level.
Once tuning is completed no further changes or adjustments are necessary. Their are millions of cars on the road built and tuned speed density from the factory. They (like the LS1) do not need to be re-flashed when the weather changes.
Driveability is exceptional, much better than the MAF. Change your boost level on the fly and fueling is perfect at any setting. Just make sure you have the proper octane fuel in the tank for a given power level.
Once tuning is completed no further changes or adjustments are necessary. Their are millions of cars on the road built and tuned speed density from the factory. They (like the LS1) do not need to be re-flashed when the weather changes.
Well, that depends on if you run in OLSD or CLSD. For some with a nasty cam and FI, they might stay in OLSD, then you have to mess with the IAT adder table. Our weather changes so drastically in FL, we would need to retune because of the IAT changes.
I second a permenant WB. Its an invaluable tool. When I tuned my SS in 2 bar, it took me 2 weeks to get the VE perfect, timing right, spool time down and some other stuff. It takes a lot of time to perfect.
I seen no cons unless you have to pay someone else to do it, then its
$$$$$ and if a problem does arise, you have to wait for them to correct it. I think I had better throttle responce with SD too. It felt pepier than with a MAF.
mine is olsd and i like it. Gas mileage is the same or better and driveability is definitely better...no lean spikes etc. It took me awhile to make the move to SD but I knew Onfire wouldnt steer me wrong and he had the same experience with the switch
Originally Posted by VINCE
Your car is just flat out fast Mark. You are 1 bar right?
Originally Posted by Slowhawk
I'm sure the car runs real good now but it would be bettter. Hard to explain till you do it.
I like the general idea of SD, in the sense that you can adjust the boost without retuning, but my concern is that I don't know -anyone- with an SD setup that doesn't drive around with a laptop on the passenger seat making constant changes.
The beauty of a MAF tune is it's, for the most part, set it and forget it.
I had my car tuned a couple of years ago and then spot checked at the beginning of this year after my meth kit was replaced, but other than that it's never touched.
As a side note, I ran my car last Friday at Norwalk with the meth and then without and it ran *exactly* the same both runs. 1.92 sixty foot, and 10.60 @ 138 MPH. I think where the meth shines is when you are beating on it constantly on the freeway in the summer heat.
Orange County Corvettes in CA charges right around 2 grand for a SD tune.
Personally, I have had BOTH, And I prefer the MAF tune. Why? Because there is No-Such-Thing as a set it and forget it SD tune. You WILL have to tinker with it. Are there guys who have their cars SD tuned and then never go back to the shop?? Sure there are. But I guarantee you their tune is off during different parts of the year, OR when they have large elevation changes.
With a MAF tune you dont have to deal with that.
Correct me if I'm wrong, but LPE tunes their 800-1000+rwhp cars with a MAF.
Personally, I have had BOTH, And I prefer the MAF tune. Why? Because there is No-Such-Thing as a set it and forget it SD tune. You WILL have to tinker with it. Are there guys who have their cars SD tuned and then never go back to the shop?? Sure there are. But I guarantee you their tune is off during different parts of the year, OR when they have large elevation changes.
With a MAF tune you dont have to deal with that.
Correct me if I'm wrong, but LPE tunes their 800-1000+rwhp cars with a MAF.
Originally Posted by KWIKKAR
again PRICE?
Originally Posted by AMERICAN_HP
Orange County Corvettes in CA charges right around 2 grand for a SD tune.
Personally, I have had BOTH, And I prefer the MAF tune. Why? Because there is No-Such-Thing as a set it and forget it SD tune. You WILL have to tinker with it. Are there guys who have their cars SD tuned and then never go back to the shop?? Sure there are. But I guarantee you their tune is off during different parts of the year, OR when they have large elevation changes.
With a MAF tune you dont have to deal with that.
Correct me if I'm wrong, but LPE tunes their 800-1000+rwhp cars with a MAF.
Personally, I have had BOTH, And I prefer the MAF tune. Why? Because there is No-Such-Thing as a set it and forget it SD tune. You WILL have to tinker with it. Are there guys who have their cars SD tuned and then never go back to the shop?? Sure there are. But I guarantee you their tune is off during different parts of the year, OR when they have large elevation changes.
With a MAF tune you dont have to deal with that.
Correct me if I'm wrong, but LPE tunes their 800-1000+rwhp cars with a MAF.
Which is really similar to the SCT mafs I use in 03,04 cobra's and lightings.
I know with my setup it is in SD right now too. Was tuned in 41 degree weather. I know on the hot summer days, up top in the r.p.m.'s like 4500 and higher you can feel the car not really pulling like it should. And im assuming this is from the temp. difference. I know as soon as I can fix my oil problem(which keeps blowing my mass air) I will be putting it back is mass air. I don't really like SD I was told your car wouldn't run to it's potential if it was tuned it cold weather and you race in hot. Pretty much I was told if it is a drag car tune it in SD in hot weather never will have to worry about retuning it because it is a drag car. But, mine is a weekend warrior and sometimes the track so I need mass air. Also the guy that tuned my car did it in a matter of hours. Only made 5 runs on the dyno ended up with 400 rwhp 465 rwtq on STS Turbo 5 p.s.i. stock motor through a 9".
P.S. Do you think that is why im having the problem with the car not pulling as strong up top as it should in like a 85-90 degree weather is bc it was tuned in 41 degree?
Jimmy
P.S. Do you think that is why im having the problem with the car not pulling as strong up top as it should in like a 85-90 degree weather is bc it was tuned in 41 degree?
Jimmy
Originally Posted by 00WHITETA
I know with my setup it is in SD right now too. Was tuned in 41 degree weather. I know on the hot summer days, up top in the r.p.m.'s like 4500 and higher you can feel the car not really pulling like it should. And im assuming this is from the temp. difference. I know as soon as I can fix my oil problem(which keeps blowing my mass air) I will be putting it back is mass air. I don't really like SD I was told your car wouldn't run to it's potential if it was tuned it cold weather and you race in hot. Pretty much I was told if it is a drag car tune it in SD in hot weather never will have to worry about retuning it because it is a drag car. But, mine is a weekend warrior and sometimes the track so I need mass air. Also the guy that tuned my car did it in a matter of hours. Only made 5 runs on the dyno ended up with 400 rwhp 465 rwtq on STS Turbo 5 p.s.i. stock motor through a 9".
P.S. Do you think that is why im having the problem with the car not pulling as strong up top as it should in like a 85-90 degree weather is bc it was tuned in 41 degree?
Jimmy
P.S. Do you think that is why im having the problem with the car not pulling as strong up top as it should in like a 85-90 degree weather is bc it was tuned in 41 degree?
Jimmy