Engine B303 And E303...do They Need A Tune?

Noobz347 said:

Thing is... At one time, I was also in the camp that believed that some store bought mass air meter was the ticket to supporting injectors large enough to power my new engine combo. Sure... I'd seen references to tuning and that sort of thing but a meter calibrated to run 42#. SWEET!

...and then I tried running it. LOL

So here I am... Brand new engine, Super charger sitting on top, 8 Green top injectors and SHINEY new mass air meter straight from PMAS that was SPECIFICALLY calibrated for 42# injectors and an A9L.

What could possibly go wrong????

Putting it into practice, that's what.

It wasn't until then that I began looking into and realizing just how much a difference there was between fuel injectors. I'd not idea that the EEC was responsible for the minimum injector pulse width and the minimum on a larger injector shot out a LOT more fuel than a 19 lb injector until it's been taught how low a slow a larger injector has to pulse in order to provide the same gas.

Those injectors just BELCHED fuel into the combustion chambers while being operated by by and EEC that thought it was half it's size.

THEN came injector slopes. WTF is this?!?! Why can't it just follow the same slope? Ohhhhhh.... because a 2% tweak on a 19 lb injectors is like a 20% tweak in pulse width on a 42??? :sigh:

But the list goes on... So I cart the thing down to dyno tuner that's several hours away and low and behold... SUCCESS! It was about a year later that I started looking to why things are the way that they are. I bought a wideband, started with an Anderson (reported to be the most user friendly) then looked into first duplicating the data on the custom chip I had burned then duplicating data coming from the PMS.

To those that can make a TwEECer do what it's supposed to do? My hats off to ya. I still can't make heads or tails out of the way that data is arranged in their software.

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