Originally posted by philstoj
Thanks for the insight. I was basically told the same thing. So if i for instance modify my engine ( port the heads,higher lift cam, larger throttle body, higher flow injectors etc) iwouldn't have to do anything with the computer because it will adjust itself to suit?
Yes you can do a large amount to the V8's due to Mass Air.
When you do change to larger injectors you must use a MAF that will compensate for that fact otherwise the engine will run rich. The EEC cannot "learn" around MAF and injector changes. So, what you have to do is fool the EEC by using a MAF that will supply the same voltage output whilst allowing more air to flow. This way the fueling will still be close to correct. It's a good idea to have an adjustable fuel regulator to allow a little fine tuning of the air/fuel ratio. I have sold many stock regs modified to allow adjustability for just this purpose.
The main problem with tricking the EEC using a different MAF and Injectors is that load calculation is thrown out by a large amount.
So you end up with too much spark advance at any given rpm or sometimes only at a certain load point.
This is easy to compensate for if you have a distributor because you can just back it off a tad. If you have an AU or other distributorless engine you will need to make an adjustable crank encoder pickup. Of course this may fix a detonation problem but it will likely provide less than ideal spark advance for all load points.
Of course electronic recalibration via an EEC-Tuner or Tweecer is the only way to get it absolutely right. Only then do all the other tricks become absolete.