i've been told some of the lightings ran a speed density system. i have an 89f150 4x4 with a 351w. i want to supercharge it. however from what i understand you have to do some things to "trick" the speed densityl system. anyone with any information on how to supercharge a 351W with a speed density system i would greatly appreciate it. thanks

keith

 

You can use a boost/timing retard, FMU and boost activated inline fuel pump. These components will work with almost all of the factory kits available for your truck. The stock injectors will work fine as long as you keep the fuel pressure up. Larger injectors and some type of aftermarket tuning would be a better route to go with boost and speed density though.

 

any recomendations for which kit to go with?

 

Vortech makes a kit for your rig.

 

Why not just get the kit from FRPP to convert it to MAF?

 

FRPP? sorry dunno what that is.

 

Ford Racing Performance Parts

 

Ford does not (currently) make a conversion kit for a truck with an electronic trans.

 

i have a c6 trans. am i good? will this conversion kit work with my truck?

 

As far as I know The only way you can modify a speed density system is to A) switch it to mass air or B) Buy a PMS unit that will pigtail in between your stock wire harness and your computer....and with this you can program your own settings. Option "B" from what I was told is better than converting to mass air.

 

Yes, convertering to mass air with that trans is much easier. If all you plan to do is run a blower and some bolt-ons, then it is possible to tune speed density to work with them.
SCT and Tweecer can also be used to tune it. If you plan to go that route, I'd recommend you invest in a wideband O2 (to monitor the air/fuel ratios) and a cab mounted fuel pressure and boost/vacuum gauge.

 

you think he may want to also take a look at the ease program for tunning you think?

 

Yes...me personally, I'd recommend it for anyone that wants to do their own tuning. I've been able to use EASE diagnostics to scan, and datalog, real time engine info to help me tune my farm truck...I've been quite pleased with it.

 

how easy is TwEECer to use? Can it be used on a stock truck?

 

Yes, it is a little challenging for a beginner. I think many speed density equiped F-150's can use the same strategy as the GEN 1 Lightnings. You'd have to contact them to be sure though.

If you decide to do your own tuning, be patient and ask questions, and make sure you have all of the tools need to help dial in your combo; at the minimum I would suggest using a wideband and fuel pressure gauge.