Great analogy, cracked me up!

In my case, it took two trips to Dustin after the mods were complete. With the right readings (rpm, manifold pressure, fuel pressure & a/f) it is possible. I sent all this info @ 500 rpm increments and she's dialed in nicely...from idle to WOT. I also have a FASS O2 sensor mounted on the dash to monitor when I'm running hard.

That's the other good way to do it H4T. With the data logging capabilities of the LM2 G4B you could actually send a ecm tuner a graph from 500rpm to WOT and they could really dial you in. I believe the logging will graph up to like 10 inputs. I just look at A/F because my stuff is old tech.

If you want a good result you will need to supply good data like H4T did and make sure you have a quality tuner doing the work.

Got running buddy that has his done by Dustin, uped rev limit and changed timming. He has soot on his transom after running. He and I have not figured out if soot is from low RPM or from running at high RPM since he is almost always at high RPM. When he did the ecms he also change the exhaust and installed shorties. He gained I think around 8-10 mph

[QUOTE=blue thunder;2679622]That's the other good way to do it H4T. With the data logging capabilities of the LM2 G4B you could actually send a ecm tuner a graph from 500rpm to WOT and they could really dial you in. I believe the logging will graph up to like 10 inputs. I just look at A/F because my stuff is old tech.

Got a link to the data logger and O2S?

http://innovatemotorsports.com/

The LM2 comes with the bosch 02 sensor and all cabling. You are best to buy direct from them I believe because you get the most recent firmware revision. I got mine from summit and had to fart around with downloads. They also have a tuners forum you can go to which would be good to do before you buy just to learn some. They are very helpful.

BT

Great stuff from these guys. I bought thier first gen LM1 wideband setup when I was car tuning. They hhave come along way in 6 years.
Good product.
So there are a fews folks out there tuning the 555 pcm????

I know the guys at mefi burn are working supposed to be working on software for it.

I just purchased Diamcom to log my 496ho's . New Gateway laptop took a dump. Sent it in a month ago and still not fixed. So no diacom results yet.

Thanks BT.

We can do just about anything in that PCM, but as a few of you said, if I'm provided some decent info, af ratio, rpm and manifold pressure, I can get it pretty darn close to perfection. Without it, I can only do what I know from prior applications.

HP gains are 20-30hp and it depends on rpm. Its about 20 at 5200, but with higher rpm limit, its 30 at 5400.

Dustin

Not the Mercury computer. It's almost impossible to find all the address's of the table/data in such a complexed system. There are multiple tables and functions that have to be modified, and each model PCM and ECM are different, so the address would move depending on base setup from mfg. Then, having someone tune that has never done it before, reading hex or manipulated numbers is impossible. You also can't program on the fly without additonal ram, which is not there on the stock computers. So even if you could do this, it would be trial and error. Make a change, if you knew exactly where to, then run, read data and see if it worked/didn't work.

We have the software from the mfg and lisc. to do the work, we have access to every single parameter and table in the computer, and believe me, there are thousands upon thousands. So nobody is selling an "inexpensive" cable and prom. These have the Motorola 555 chip, nobody is replacing those.

Thanks,
Dustin