I know that with certain modifications with a speed density 5.0 you have to adjust the computer to what you added. I just wanted to know what modifications require adjustments. Any info is greatly appreciated
malik641 said:I know that with certain modifications with a speed density 5.0 you have to adjust the computer to what you added. I just wanted to know what modifications require adjustments. Any info is greatly appreciated
astronut1885 said:You can't adjust a speed density computer. Most minor mods, like exhaust are fine, but big things like heads/cam/intake need a mass air conversion. Speed density is set up so that at certain RPM, the engine is fed a certain amount of fuel. That is fine on a stock motor because that fuel level is tailored to the amount of air used by a stock motor, a nice balance. When you begin to improve airflow, you throw off that balance. The same amount of fuel is there, but you have more air, you are running lean. When you upgrade to a Mass Air Flow system, it fixes the lean problem. A MAF system reads how much air is going into your motor at a given time, and supplies enough fuel to match. So rather than a set RPM/fuel ratio, you have a direct air/fuel ratio. This allows you to go as crazy as you want with the motor, as long as your fuel system can keep up. Hope I answered your quesiton.
The Shape said:I have also read that stock for stock the SD cars were faster than the mass air cars. Don't know how much truth there is to that though
88STANGCONVERT said:If you will take the word on here of anyone, listen to TMOSS and COBRAGT87 when it comes to SD.
COBRAGT87,
Mr. Speed Density, I was wondering if you were still around. Your knowledge of SD is amazing. I have some questions for you, I will PM you on them if you would not mind.
CobraGT87 said:you must still be living in the dark ages . I ran H/C/I/N20 on SD with 0 probs, even on a 347 at one time. many people also run blowers too, plus SD CAN be tuned like TMOSS said.
I worked with SD for a good 10yrs and know what it likes and doesn't like..
read up on it. That info is just as bad as the old myth that 347's burn a ton of oil and don't last
GT Trooper said:What's up,
I'm in need of information regarding if I really need to do a MAF conversion. I have a 88GT vert with Cobra intake, Canfield heads and a mild cam. The car has stock exhaust which I will be changing to long tubes and off road exhaust. In case you are wondering I bought the car like this two months ago. Currently it runs fine but I'm wondering with the exhaust mod, will it effect how the car runs and is it really necessary to do the conversion. In the forum you guys state that an SD car can be tuned and I'd like any assistance you can offer on that as well. Any info you could give me would be greatly appreciated.
Thank you very much,
Emmitt