Grainger valve with a 3 bar cal

[Shel-Game]

Quote:

Originally Posted by Una I assume your talking about the cal I downloaded, Rob's cal. Not the TU cal. As I couldn't fix anything in the TU cal if I wanted to. Anyways, no, the car doesn't seem to idle and richer than it is supposed to when it's cold. It doesn't stay cold for long.

I meant Rob's cal (I'm Rob - BTW ). Some of the other guys running that cal were having rich issues at cold idle (Dean Stillie/Jon Berube). I was just curious if you also had a rich cold idle, and how you fixed it.

[minimopar]

Rob,

When I went to 52pph injectors, I had a host of idle mixture issues. It took some tuning of the cold start and base fuel tables to get it right. I know your cal was originally 3-bar/33pph. I imagine that setup shouldn't require any cold start table tuning, but perhaps the lower resoltion of the in-vacuum area on the 3-bar MAP may be causing some errors to build up in the cal?

[Shel-Game]

Quote:

Originally Posted by minimopar Rob, When I went to 52pph injectors, I had a host of idle mixture issues. It took some tuning of the cold start and base fuel tables to get it right. I know your cal was originally 3-bar/33pph. I imagine that setup shouldn't require any cold start table tuning, but perhaps the lower resoltion of the in-vacuum area on the 3-bar MAP may be causing some errors to build up in the cal?

Yeah that could be. I was also thinking about the Pumping Eff Table. Mopar set it to a constant 86% below 2800rpm. Which, obviously, isn't realistic. I'm wondering if they fudged it a little to make sure that idle was slightly rich. But when converted to the 3-bar set-up, it's too rich. I think I'm going to try setting the PumpEff table to 75% below 2800 rpm and see if that clears up the idle richness.

[Una]

Maybe that's why I'm not having a problem. I have +40 injectors, which I was told flow more than +40, so I scaled my pumping efficiency table down 45% rather than 40.. I did notice that in vacuum the car wanted to run kind of rich until it adapted, so all of my out of boost fuel tables went down 5%. Then I wanted to make boost safer, so those are all up 5%.. hehe.. Sometimes I feel like a caveman hackin my tables, but so far so good. Oh, and I raised the part throttle fuel tables under boost up to the same levels as full throttle. It always weirded me out to see the boost gauge say 10psi, and the O2 gauge still bouncing up and down, because I was only at like 1/4 throttle. That problem is very much gone.

[unclejemima]

Quote:

Originally Posted by Una It always weirded me out to see the boost gauge say 10psi, and the O2 gauge still bouncing up and down, because I was only at like 1/4 throttle. That problem is very much gone.

agreed, this makes me nervous as well! Good idea!
-mark

[Una]

Quote:

Originally Posted by unclejemima agreed, this makes me nervous as well! Good idea! -mark

thanks. One of the awesome benefits of being able to do my own cal. Every last odd quirk my car has had has been fixed.

[D-Cal]

Quote:

Originally Posted by minimopar Rob, When I went to 52pph injectors, I had a host of idle mixture issues. It took some tuning of the cold start and base fuel tables to get it right. I know your cal was originally 3-bar/33pph. I imagine that setup shouldn't require any cold start table tuning, but perhaps the lower resoltion of the in-vacuum area on the 3-bar MAP may be causing some errors to build up in the cal?

I had to pull quite a bit of fuel out of FuelColdEnrichmentCurveA to get it to cold start correctly when I made my 89 T2 a 52pph cal. Have a look at the cold start tables in S60.