SD tune with FI worth $1000 more
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From: Louisville, Ky
SD tune with FI worth $1000 more I read an older thread and it basically said the benefits of a speed density tune is better idle and driveability, but, a MAF is better because it can compensate for changes in weather. So when you run a MAFless Speed Density tune, is there no way for the car to correct for weather? I plan on driving my car year-round except Dec. thru Feb. when it snows. That means 90*+ in the summer and 30* in the winter. How will this effect driveability and reliability?
I know some of the other benefits of a SD tune is the ability to run whatever desired boost level you want vs. having to have a daily driven tune for lower boost and a race tune for high boost with race gas. Also, the ability to set boost against RPM or gear. That was my main reason for doing it. My same setup on a friends car was useless until third gear and rolls under 70. I would like to run say 9lbs in 1st gear, 12lbs in second and max boost (15-16) the rest of the way. Will it be possible for me to run 9lbs in all of first gear, 11lbs at the beginning of second gear and ramp it up to max boost by the end of second gear, or is that asking for toooo much?
Another one of my main concerns is running methanol. I like the idea of being able to run less boost and make the same power but what do you do when temps are colder down in the 30's and it isn't (as) neccessary anymore, or does it still help? Isn't the tune based around running methanol? Will the engine compensate if I turned it off? How does this work?
I can tune my car for free or spend $470 on an Eboost2, $80 on a MAP seonsor, and $200 for the additional SD cable. Thats $750 plus time if I'm charged which could easily go above $1000. Is it worth it? I was also told it was more safe than MAF. In what ways?
I know some of the other benefits of a SD tune is the ability to run whatever desired boost level you want vs. having to have a daily driven tune for lower boost and a race tune for high boost with race gas. Also, the ability to set boost against RPM or gear. That was my main reason for doing it. My same setup on a friends car was useless until third gear and rolls under 70. I would like to run say 9lbs in 1st gear, 12lbs in second and max boost (15-16) the rest of the way. Will it be possible for me to run 9lbs in all of first gear, 11lbs at the beginning of second gear and ramp it up to max boost by the end of second gear, or is that asking for toooo much?
Another one of my main concerns is running methanol. I like the idea of being able to run less boost and make the same power but what do you do when temps are colder down in the 30's and it isn't (as) neccessary anymore, or does it still help? Isn't the tune based around running methanol? Will the engine compensate if I turned it off? How does this work?
I can tune my car for free or spend $470 on an Eboost2, $80 on a MAP seonsor, and $200 for the additional SD cable. Thats $750 plus time if I'm charged which could easily go above $1000. Is it worth it? I was also told it was more safe than MAF. In what ways?
Why would a maf sensor be used for temperature changes????? Maf is only there to count airflow.....
The Intake air temp sensor would be used to determine temp changes in outside air...
The Intake air temp sensor would be used to determine temp changes in outside air...
Originally Posted by wait4me
Why would a maf sensor be used for temperature changes????? Maf is only there to count airflow.....
The Intake air temp sensor would be used to determine temp changes in outside air...
The Intake air temp sensor would be used to determine temp changes in outside air...
Originally Posted by white2001s10
The baro and IAT functions still work in SD mode.
Some people also run closed-loop in SD mode.
Some people also run closed-loop in SD mode.
Exactly,
Just because you have no maf sensor on the engine, doesnt not mean the computer dont have the ablity to correct fuel conditions.
The Computer does not fix the Maf signal with fuel correction.
It corrects the incorrect Ve table via trims. So, That being said, Why would it matter if the maf was there or not if it is just another sensor that the computer cant correct the signal of..
On the Efilive custom operating systems, you can adjust the main fueling tables via intake air or coolant temp if you want.. But those changes would normally only be needed if you are in open loop with no fuel correction. If the o2s are on and in good operating condition, Semi closed loop state does very well.
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To add to your question about methanol tuning and various weather temps, if you have the time to perfectly nail down your spark advance and iat spark corrections, you could see quite a bit of additional power when the temperature drops to the 30's, just from the additional spark advance at higher boost levels. You rarely see people go to that kind of trouble to nail down a perfect year round tune, however.
