[sd460f350]

i have a '90 f-350 with 460 and 5 sp and its speed density. 466 cid, 270h comp cam, cleanup porting, jumped comp from 8.5-9 to 9.5, roller rockers, and headers. nothing crazy and no major upgrades planned. bought a motorvation custom tuned chip and had zero luck. it might be on my end but cant get any advice. stock program will run it with but poor idle and high end. when i plug chip in and it reverts to base timing and fuel pump continous run. everyone pushes maf and i am willing to do that if its what i need, just not sure i need to. fotf-axa toj is my ecu. i understand how the systems operate but have little experience. please guide me in a direction worth running with

[cgrey8]

I would agree. Ford's implementation of SD doesn't work well with aggressive cams. While this isn't an excessively aggressive cam, it isn't what I'd call mild with 224/224@.050" duration. That will play hell with SD at idle. Although I would expect some typical tuning could take care of the WOT. I too would recommend you go MAF instead of SD for this.

[mpaton]

i have a '90 f-350 with 460 and 5 sp and its speed density. 466 cid, 270h comp cam, cleanup porting, jumped comp from 8.5-9 to 9.5, roller rockers, and headers. nothing crazy and no major upgrades planned. bought a motorvation custom tuned chip and had zero luck. it might be on my end but cant get any advice. stock program will run it with but poor idle and high end. when i plug chip in and it reverts to base timing and fuel pump continous run. everyone pushes maf and i am willing to do that if its what i need, just not sure i need to. fotf-axa toj is my ecu. i understand how the systems operate but have little experience. please guide me in a direction worth running with

MAF is likely NOT necessary from a technical standpoint. However it seems to be impossible to find a Ford tuner who understands how to tune SD systems, so they all push what they do understand which is MAF. The most tuned Ford SD vehicle is the Gen 1 Lightning truck, so someone who can tune them properly could be a good place to start.

If you wanted to learn to tune it yourself, there's a lot of information scattered about these forums.
Look in the "Tuning the EEC" forum for posts by Diabolic1. He has 2 vehicles, one a MAF, and one a Gen 1 Lightning, so his learning curve may be educational for you.

The symptoms you describe for when you plug your chip in mean that the chip was not programmed for your ECU. Don't use it. Send it back if you can.

You've also posted a sort of shorthand for your ECU numbers, but can you post the full details. Is the catch code (the numbers in a much bigger font) really TOJ? Or is it T0J?

If cams are too aggressive, then they create issues for both SD and MAF systems. In any EEC-IV system, a very significant amount of the code is dedicated to achieving a good idle, so I expect that it could be made to idle OK. However, the moment you touch the throttle, little of that code is used, and other parts of the tune need to be right.
I'm sure the other issues can be made to work with SD.

Paying someone to convert to MAF and tune it won't be inexpensive, and neither will buying all the tuning tools you'll need to have a shot at doing it yourself with SD.

[sd460f350]

it is a t0j. (t-zero-j). i havent had much luck finding a tuner, thought i found one but when it came down to it he didnt return my calls. and at the end of the day the MAF is much better. i did find a company that builds a customer ecu as a eec replacement. its not cheap, especially cause it is just a tunable speed density. it sounds great and easy to tune but if its easy it prolly aint gonna work. i want the best and i want it for like $50. lol not gonna happen. has anyone had any experience with the Dunne-rite MAF conversion kit? its reasonably priced but it costs enough i wanna hear from someone other than the guy sellin it that its gonna work well.

i talked to a couple people and they have been very helpful but i just dont think there is a great option. now im kinda kickin around building it myself. starting with an A9L, a schematic, and some junkyard and craigslist parts. after all that is the most supported platform

[decipha]

in short.. the stock speed density ecu can run your engine extremely well, as well as a maf setup IF tuned properly, the ONLY downfall of the OLDER ford speed density ecu's is that they don't give you as much control as the mass air ecu's. More so under aggressive acceleration when your not to the point of enrichment but must do so to compensate for higher loads.

Another problem you may run into is finding support for your ecu, a bunch of the non-common older speed density ecu's aren't very highly supported. As soon as someone identifies your ecu strategy you'll be able to make a decision from there as to which route best suits your needs.

If you do intend on replacing the ecu and swapping to mass air, I'd recommend staying with the stock ford ecu's and just upgrading to a newer more supported well known ecu, like cbaza for example (94-95 v8 mustang) which is my preferred ecu for sbf's.

Im not sure if your ecu is batch fire or not but the newer ecu's do fire sequentially so you may need to rewire your injector harness a tad. It's been done many times before so if this interests you search for computer swap threads.

as mr. paton stated, your fuel pump running constantly is due to the chip's programming (tune) not being supported by your ecu, so ship it back if possible.

Welcome to the forum