richer or leaner

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Jul 12, 2010 | 09:07 PM

dtroike

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From: winnemucca nv

richer or leaner

I am new to using HP Tuners and a little overwhelmed by it. I just put a new engine with a 250's cam in my car and had Synergy do the base tune and it ran perfect in california, but I live 4500 feet higher than where it was tuned. I wouldn't expect the drivability to be great with this cam and was very surprised at how well it was at sea level. I know it has room for improvement at my elevation. It has a MAF tune in it. There seems to be A LOT of different ways to richen or lean the tune. What is the most common, best, easiest, or first way to do it at a cruise and at wot. It idles great. Just has a lot more surge in it at a cruise from 1500-2500 rpm's.
I would really appreciate any usefull advice.

Last edited by dtroike; Jul 13, 2010 at 12:24 AM.

Jul 12, 2010 | 10:20 PM

Frost

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From: Richmond VA

If it's in closed loop when you cruise there, you can't fatten it up because the trims will trim it back to stoich.

Jul 13, 2010 | 12:10 AM

dtroike

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richer or leaner

I may be in over my head. What if I change the injector flow rate?

Jul 13, 2010 | 12:15 AM

macca_779

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From: Katherine N.T Australia

Quote:

Originally Posted by dtroike

I may be in over my head. What if I change the injector flow rate?

For the love of god, don't do that. Dial your airflow model/MAF in. Then if you want to screw with AFR's.. Turn off CL and command it

Jul 13, 2010 | 12:18 AM

Frost

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Quote:

Originally Posted by dtroike

I may be in over my head. What if I change the injector flow rate?

Same answer as before... trimming will move more negative, but final fueling will be the same. That's what the trims are for.

When using closed loop, the largest cause of buck or surge is excess airflow. Timing also plays a role.

Jul 13, 2010 | 12:23 AM

dtroike

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From: winnemucca nv

richer or leaner

Im still confused. So do I need to adjust my MAF frequencies. Do I need to adjust my stft or ltft. Do I need to get out of closed loop to do this, or am I not even in the same ball park? How do I comand an afr.

Jul 13, 2010 | 05:35 AM

69LT1Bird

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I am thinking you need to go over to the HP Tuners site and do some reading and research on the basics. No offense but you need to know how the system works before you get totally lost and then you will be in real trouble.