How is injector timing calculated?

[blkscooby]

People don't have a long attention span. If you can't condense something down into your own words concisely, it'll get passed over.

As a BSME, that article is just a long winded mechatronics intro. It's just not engaging to read. It's not the core content... It's the writing style.

As a BSME and MS in Marketing, I agree it is not the best writing style. But I understand it.

[DSteck]

There's definitely a noticeable decrease in volumetric efficiency when you delay it at low speeds. If you tune in SD and then delay it, you'll see it go rich.

[IDRIVEAG8GT]

the lower LSA makes the DCR higher,

Correct

[IDRIVEAG8GT]

Dave, point is, he could've spec'ed a better cam but later came to find out that the cam I was spec'ed and paid the extra money for was an OFF THE SHELF grind from Comp.

The new Lunati runs better, drives better, idles better and has more vacuum.

So basically I got fucked for an extra 50 bucks.

Why do I argue in my defense? Because it seems like I'm the only other swinging dick out there that puts out the money for a good quality product, then gets screwed over. Maybe people just don't like me. Really though I don't care, I justify my methods with my past experiences and lost cash. I try not to go out of house for anything any more.

Unfortunately though people like to argue irrelevant points and twist my words into non-sense.

[blkscooby]

There's definitely a noticeable decrease in volumetric efficiency when you delay it at low speeds. If you tune in SD and then delay it, you'll see it go rich.

Yes, I witnessed this. I had to drop the VE table at low speeds after EOIT delay

[DSteck]

It's always about balance. Unfortunately, there's no perfect scenario.

What you can do though is tune the SD to the teeth... Then delay or advance EOIT. Any section where it goes rich means a loss of power. Anywhere it goes lean is a gain. It'd be a long winded method but could help set it for maximum fuel economy and power.

[Area47]

ds, used the spread sheet against my factory numbers and .006 evc. came out wonderfully. picked up the power and mpg that was lost by setting the ect to a 20 degree retard, or the guessing game i was doing. thank you for all of the help in this. im finally happy with the outcome and numbers.

[blkscooby]

I retarded only the low RPM section and left the rest stock. I got 26 MPG on the highway and 21.5 mixed. Still a little to go but much better.

I ran similar injector timing early in the cam tuning process on MAF only and got terrible results. The car ran very rich. Only got 16.5 mixed driving. The only thing I can figure is I was getting reversion due to the overlap and the MAF was reading high, therefore it ran rich. Now on SD and MAF, the car runs much better.

[Area47]

I retarded only the low RPM section and left the rest stock. I got 26 MPG on the highway and 21.5 mixed. Still a little to go but much better.

the mpg in my flying brick went back up to where it was on the stock cam. i only chenged up to 1300 or so rpms. the rest is factory cal

[Jamz]

can your latest settings blkscooby?