where to adjust fuel - DIY PROM - Third Generation F-Body Message Boards

brandenbtl16 · 07-07-2008, 08:15 PM

Hey guys,

Couple quick questions. First the car: I have a 1951 Ford I have a 400 small block with a tuned port on top. Running 24lb svo injectors. The cam is comp cam with a lift of .488 intake and .495(the cam is a fuel injection cam) exhaust. I am Having trouble creating any real power. two seperate transmission shops have told me the car is breaking up and the motor is not pulling through. I was running the factory eprom. I changed the cylinder volume to match the 400 and changed the injector pulse width to 24lb injectors. The motor would break up when the car would get to 4,000 rpm and the tranny would not know where to shift too. I have changed and downloaded a Street and Performance chip that is supposed to be for big motors and it seemed to be a lot better. I changed the cylinder volume and injector pulse in that chip as well but still have some fuel problems. with the new chip i need to turn off the egr constant. does anyone know where to do this? And also I would like some advise on were to go to start adding more fuel to the car. (oh i should have said I have the moates tuner pro)
please let me know what you think
Thank you
Trever

gta324 · 07-08-2008, 12:16 AM

First if you have a stock TPI intake on your 400" it isnt helping it, TPI intake dont like high rpm's. A diffrent intake would really wake the engine up, but it depends on where you want the power and what heads/cam you have.

EGR: there is a min temp for EGR enable
Fuel: adding more fuel where? idle/part throttle, cruise, acceleration, or WOT. read here under 730 there are some good stuff about tuning. http://www.thirdgen.org/techboard/di...uide-book.html (The Prom Tuning Guide Book and FAQ: Common Questions and Answers)

More info about setup and scan results would help guiding you.

/N.

brandenbtl16 · 07-08-2008, 09:18 AM

I am new to this but I guess i am running out of fuel and acceleration and wot. I can give you the cam specs and the heads when i get home. I also have some scanner read out from my snap on solus pro. what would you be interested in knowing from the scanner??
Trever

gta324 · 07-08-2008, 03:21 PM

Read the stickey abot tuning 730 8D ECM and you will see what tables to change and what they do. I think you need to start from the beginng with the tune.

1 Basic changes(cyl/vol, inj size, idle speed and so on...)
2 Ve tables and SA table, idle/easy driving getting the BLM "close" and a timing table that the engine likes.
3 AE and wot fueling

As much info as possible

/N.