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-   -   Turbo- what kind of Cruise AFR are you running? (https://www.rx8club.com/series-i-engine-tuning-forum-63/turbo-what-kind-cruise-afr-you-running-182397/)

Mawnee 09-13-2009 06:21 PM

Turbo- what kind of Cruise AFR are you running?
 
I've started tweaking my Closed Loop fuel to get my fuel mileage back and smooth out a little bucking in low rpm. Just wondering how lean you guys run it for low load cruising. :)

mysql101 09-13-2009 06:23 PM

I don't get the question.

A turbo car is just like a NA car when you're not in boost. So I'd expect ~15 AFR at cruise.

Brettus 09-13-2009 06:25 PM

Kane has a pretty good handle on this I think .

Can you post your closed loop table - I can't be sure which one it is in pro tuner .

Mawnee 09-13-2009 06:29 PM


Originally Posted by mysql101 (Post 3221887)
I don't get the question.

A turbo car is just like a NA car when you're not in boost. So I'd expect ~15 AFR at cruise.

I know 14.7 ...but alot of people get away with going even a bit leaner for the sake of fuel mileage.

mysql101 09-13-2009 06:38 PM

yeah, you can do 16, but only if you aren't running a cat.

Mawnee 09-13-2009 06:40 PM

pffft..whats a cat ? :D:


Originally Posted by Brettus (Post 3221889)
Kane has a pretty good handle on this I think .

Can you post your closed loop table - I can't be sure which one it is in pro tuner .

My CL tables are essentially stock atm, I just lowered the exit RPM to 4200 and Exit loads down a bit to make sure it switches to my richer tables ahead of any boost. My o2 sensor has like a 1.7 second latency so I have to kind of predict the future with my fuel tables for safety. I had set my Throttle fuel gear tables really rich when I first put together my "super duper safe" tune and forgoten about them. Found those to be the cause of some low speed bucking :D:

mysql101 09-13-2009 06:42 PM

don't let TeamRX8 hear you!

thewird 09-13-2009 06:44 PM

15-16 as long as its smooth and only in high vacuum.

thewird

09Factor 09-15-2009 04:20 PM

14.7 - 16.2 @ 20-22 in mg.
No cat.

chickenwafer 09-24-2009 10:25 PM

Cruise at stoich.

Just put all your CL fueling tables to a Lambda of 1.00

Kane 09-24-2009 10:32 PM

Start at 15.2 and move to 14.7 at RPMS above 3500 and a Load above 30%

That is what I do... but 14.7 is always a good safe bet.

Rote8 09-30-2009 12:43 PM


Originally Posted by 09Factor (Post 3225142)
14.7 - 16.2 @ 20-22 in mg.
No cat.

How many rpm is that at?

I get 20 in mg at idle and 22 in mg at a cruise if I am doing about 2K to 3K rpm
If I cruise at 4K (about 80Mph) I only get 16 to 18 in mg.

Still get 28 in mg on deceleration.


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