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Cruise timing

nos4blood70

nos4blood70

New member
What kind of timing are you guys running in your cruise cells? I think I went too far in my tune. The other day I was getting KR at cruise on the highway. Any kind of incline, even slight, would give me KR. Flat ground is no problems. Highest would be about 4, but that would be a spike. Most of the time it hung around between .5 and 2. This is cruising at 70 and up, AC on. The quicker the speed the easier KR would rear its ugly head. Turning AC off wouldn't change things very appreciably. IATs in the low 90s. Running 93 octane. L36.

I understand that KR is not bad without boost but it is inefficient so I might as well kill as much of it as I can. Cruising at 55 the car has seen high 30s MPG. I guess that's the pay off with high timing? Freakish fuel economy at lower speeds, more KR at higher speeds?

Any further help and explanation would be awesome.

I'll post a pic of my timing tables in a bit.
 


Thats not very high at all.

From .12 to around .24, I run from 40 down to 33ish.

But as rpms rise I lower it down to higher 20's and after .28 I scale it downwards alot. But mainly the section I focus on is .12-.28 and from 1200-3800 rpms or so.
 
Thanks for the tip. I'll try modifying the tables later. Been driving 120 miles every other day or so and 55 is getting boring.

One thing I noticed is my Aeroforce indicates 40+ degrees at times, but I don't see that anywhere on my table.
 


Hmmm. My IAT and ECT timing tables are all zero'd out. Should probably run some scans when it gets warm again and retard some of this timing based on the IATs.
 
OP, the adder table will be your EGR, can't see it in HP Tuners. It adds a fair bit to the main table but is very spotted in its adder pattern which is why I typically disable it. Couldn't modify that table without requiring you to license a new file in your HPT so you have modified stock timing tables at part throttle.

If you're seeing 40*, you're fine, you'll see zero gains running above 35* timing in low load cruise situations.
 
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