Thoughts on PE Ramp-In

[JakeFusion]

So, I have a cam that idles at 68-70 kPA. And I want to make sure PE ramps in as cleanly as possible from lean cruise. I am setup for OLSD at idle and CLSD at cruise.

Right now, I have PE enrichment enable MAP setting to come on above 50 kPa, my Enrichment Ramp In set to 4 and TPS cold threshold as follows (stock hot table copied to cold with nothing in the 0-1600 cells):

0.0 0.0 0.0 0.0 64.0 64.0 64.0 64.0 55.0 45.0 36.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0 26.0

I figure the TPS threshold is okay, but I'm wondering if I should bump my enable MAP setting to something closer to 70 kPa and whether I should just leave the enrichment ramp in to 1?

1 is how it was stock, and I'd like PE to engage as fast as possible. In older posts I saw, it was said that 1 was near instantaneous. If that's true, how can you speed it up to be faster? Also, I saw in those older threads that stock was 0.2 and that's not true in the later versions of HPT. So, I don't know if something changed along the way?

Any thoughts?

[Cyrperformance]

Higher the ramp in the quicker it comes in.

[JakeFusion]

Okay. That's what I thought. So 4 is the max. I'll leave that be.

[POWERZONE]

PE ramp in is something that should be monitored via your vcm scanner chart vs. just arbitrarily set. Yes you set it higher than stock with a good starting point of 1.3 to 1.5 for NA. But it should be monitored and adjusted based on the actual logs. There are some cases where the ramp is set too high, you get an overly rich dip in the afr curve. Then many end up adjusting their ve or MAF table to fix this. So in a sense its false conceptually to have a high ramp in but lower ve or maf point in the curve.

1.3 to 1.5 is sufficient for 95% of NA cars.

FI cars where a faster ramp in is "needed" can suffice at 1.5-2.0.

So as you see, you have to ask yourself, what is it in my tune or fuel system, that is requiring you to "need" a 4.0 PE ramp in for a NA street car?

[edcmat-l1]

I've never seen any time difference in PE ramp in time over 1.5. Log it at 1.5, and then at 4.0 and report back. 1.5 is near instantaneous. As long as the TPS and MAP threshold are met.