I have a speed density car. Would someone be so kind as to give me some pointers? I have been getting a lot of mix reviews. I was told the best and first thing to do is GEARS? I am open to all suggestions. THANKS!
Speed density is a form of controling the air/fuel mixture by pre-set codes in the computer. YOU CAN MANIPULATE THEM WITHOUT A CHIP!
Speed density was the first form of air management for the multiport EFI Mustangs. It was used into the 90's in trucks and non-H.O. 5.0's, such as Lincolns and T-Birds. For the Mustang, it was used in all 5.0's in 1986, 1987 and all 88's except for the ones sold in California.
All and all, you can do anything that you want to do to a speed density car except for a large cam. Speed density requires vacuum, at least 19 inch pounds. Stock 5.0L HO cam's advertised specs are 266°/266° duration, 0.444"/0.444" lift, Iskidarian makes a cam that works well that is 252°/257° duration and .465"/.480" lift. The reason why the cam works well is that the lobe center is 112°, good for vacuum.
I am currently running a speed density 1986 5.0 with a 65mm Accufab throttle body, a REAL Ford Cobra intake, GT40 Y heads, the cam listed above, equal length headers, a custom X-Pipe and Dynomax Ultra Flow mufflers. My fuel system is a Walboro 155 lph pump, an Accufab adjustible fuel preasure regulator and FRPP 24 pound injectors.
The trick to running speed density is to have a cam the produces enough vacuum, and to adjust the fuel and air flow correctly. As you increase the air, you will have to increase the fuel in equal ratios to stay within the factory programming. Some will tell you that this is not possible, but it is. The best thing to do is to work with a shop that has a dyno and can read air/fuel exhaust ratios. I daily drove my 86 with this combo for over 50,000 miles without issue.
What if i kept my stock cam and just added gt40 heads, 24lb inj, high flowing fuel pump, 70mm tb and a msd 6al box!? What is your thoughts on the new bbk intake?
I ran speed density on my 86, it had 65 TB, and ported stock head with cobra rockers. it was very quick. south side bars and 3.73 gears.
__________________
DSS 331 stroker, AFR 185 heads, Performer rpm 2 intake, Accufab 75 mm race TB, 30lb injectors, 80 mm Pro-M mass air, Extreme energy cam 266.
Anderson ford power pipe the big one, Ford motor sport shorty headers, Bassani x pipe custom cat back with flows, World class T5, center force duel friction clutch.
I am running speed density 88lx with stock internals i.e. stroke,pistons,cam,lifters,rockers. and have some mods done to the intake, heads,bigger TB and so on and no problems and i would like to think it is pretty fast compared to what i have raced against. I also would like to know more about what twister is talking about, i have always been told can't go over like 490 or 494 or so on lift without converting to maf.
__________________
88LX black 5.0, 5 speed,ported upper and lower intake,ported upper throat,phenolic spacer,3angle valve job,bbk 65mm tb & egr, jacobs ignition,dualfriction centerforce clutch,k&n,12-14 timing,plugs gapped 60,nitto450's,removed air sil,dual electric fans,after market rad,fms front lower arms,new o2 sensors,under drive pulleys,carbon brakes.
87 Speed density!? Plese help!? 
