I have been asking a lot of questions about HP vs torque and HP and 1/4 mile times. It is time to ask the question of all interested. I have a line on a fresh (never fired) 351W with new world products windsor jrs (all new valve train as well as roller tip rockers), performer intake, matching cam (about 210 dur at .05 and around .470 lift), hypereutectic pistons, MSD dist, water pump, timing cover and valve covers (has a 4x4 pan and pump intake). Everything new and professionally installed, but built for 4x4. It is not a roller motor. Flat tappet. Another member was kind enough to run it through desk top dyno and got about 330HP and 400ft/lb of torque. In a 74 maverick with a 180lb driver that would be about 3400 lbs total? correct? So, in theory this would be about 13 flat in a 1/4? To all of you EFI guys. What about using the GT 40 intake with 24lb injectors, 65MM TB, 70mm MAF and a 93 cobra ECM? Would the ECM be able to handle the difference in cubes. Mass air will allow compensation but don't know if the ECM can compensate for the change in cubes. May go back to carb and pitch EFI stuff. Makes for a cleaner engine bay! Finally, I have the tubular automotive headers for the swap. Thanks to Maverickgrabber. Tell me what you think! Thanks.
The extra cubes have nothing to do with computer. The sensors send input to the computer it processes it and then sends output signals. Will it work perfect, without any mods, I doubt it. You will likely have to go with bigger injectors, a better mass air flow meter and I higly recommend senidng your stock computer somewhere to have a custom memory flash or buying a Tweecer computer and programing it yourself. Good Luck
1badmav, the TB, MAF and 24lbs injectors are bigger than stock 5.0 but I was worried about needing to "tune" the computer!
It's my understanding that all you have to do is find someone who can burn a new chip for the computer. My automotive instructor and I have been discussing this for awhile. I wanna do a 408 EFI and he told me that I could use a 5.0 computer and he would just burn a chip for it. So it's possible. Just gotta find someone who can burn a new chip. Good Luck!! Preston
A couple of things: 1) The MAF has to be calibrated to the injector size - unless - you have a custom chip burned. 2) Use this link to help determine what size Fuel Injectors to run http://www.rceng.com/technical.htm 3) Take your car to a dyno and have the chip burned (total cost around $500 for dyno pulls and custom burned chip). 4) Depending on 'when' you want this horsepower (all the time on the street or just at the strip) I'd opt to simply add a wet nitrous system to your existing setup instead of engine/electronics swap. As you're aware, there's no better bang for the buck than Throttle-in-a-Bottle! I know a guy who has been spraying his stock 5.0 engine/intake with a 200 shot of nitrous (on a 200,000+mile motor) for over two years now. It runs like carp on "all motor" but when he hits the switch, it's instant horsepower. just my .02 Good luck either way.
the maf is calibrated to the 24lb injectors. The MAF, injectors, and ECM are from the 93 cobra. According to the site I would need about 26lb injectors!
I'm not surprised about the injector size. You can get 30's pretty easily (might even check ebay). ....OR.... maybe just increase the fuel pressure a little bit (provided you have an adjustable FP regulator). I'd have to ask around to make sure increasing the FP would work - but if it's that boarderline, I'd say it'd be okay (make a run, shut the engine off and read the plugs)
I would not recommend the Cobra computer unless you already have one. The A9L is much more user friendly. The Cobra computer is programmed for 24#ers, so if you ever decide to change injector sizes, you wont be able to simply change the mass air meter. You will have no choice but to burn a chip. This isnt really a bad thing though, as once the car is modded to the point of needing 30#ers it probably wont run great without a burnt chip anyways.
stockhatch, thanks for the info. I'm currently running a 91 automatic ECM but I was able to buy the cobra ecm, MAF, cam, lifters, timing chain for under 100 bucks. I was wondering what was used on the 5.8 liter lightenings. The 351 I'm proposing to use wouldn't be much different in performance level.
Injector wise, Im not sure what the Lightnings used, but I believe they were all speed density until the 5.4s. Sounds like you got a great deal on the Cobra stuff. You might be better off selling the Cobra stuff and using the money for some 30#ers and a MAM for your current ECM. You prolly have the A9P which is the next desirable computer after the A9L.
Heh, it appears the 1st gen lightnings used 19# injectors Guess that makes sense as they supposedly only made around 240hp.
it is the A9P. I'll look into the lightening "stuff". Is the A9L the 5spd ECM and the A9P the automatic?
