Modified IDM and tuning

[Pocket]

Originally Posted by 907dave

So then - back to my original question, how to decrease spool time.

Looks like dropping ICP in the low RPM's, or pulling some timing out would both help this situation.

Would you venture to guess this is what Ford had in mind when designing these maps?

Seems like there would be a trade off, crispy clean throttle - or faster spool up.

Try adding too much fuel at lower RPM's. What happens? You get lots of smoke, and a turbo that seems to take forever to light.

Adding more fuel at lower RPM's doesn't increase the spool up of the turbo. In fact, it can be quite the opposite, increasing lag time until the turbo finally catches up, then you get a neck snapping response after you've killed a few hundred polar bears with the exhaust trail left behind

In the mean time.... with all that fueling and no air, EGT's rise quickly. It's especially troubling if your driving up a hill and the engine loses speed. That's when you start seeing smoke pour out the tailpipe, and the EGT gauge rises quickly.

That's why I like my tuning to have pretty much bone stock fueling for the first half of the pedal.

Think of it in terms of pulsewidth... not so much ICP and timing (although those are important too). The main thing to look at is how much fuel is being called for right off idle, and in the RPM range before the turbo spools.

[907DAVE]

Originally Posted by Pocket

Try adding too much fuel at lower RPM's. What happens? You get lots of smoke, and a turbo that seems to take forever to light.

You are correct, however I am not looking to add any more fuel - just retard the timing to help the turbo out a bit. I was looking to do this by pulling some timing out of the base SOI map, or by dropping the ICP to slow the SOC.

I do understand that by dropping the ICP you indirectly increase PW, which I dont think will have a great effect on the total quantity of fuel delivered - it just wont be as complete of a burn.

I have had a bit of time to play around with this the last few days and it seem to be working. It doesn't have that "neck snapping" crispness, but instead a smooth progressive feel.

Have not decided which I like more, but I do like the reduced engine noise.

[907DAVE]

Colt, now that you thread it bit off topic..........

How Minotaur treating you?