dyno tuning
Thread Starter
Intermediate
Joined: Apr 2006
Posts: 29
Likes: 0
dyno tuning
I have a 01 m6 coupe. The car had work done by Next Level Performance, which is in FL. It has afr heads, comp cam, halltech, longtubes, corsa's, etc. It was dyno tuned there at 436rwhp. I purchased the car from a dealer and had it shipped to WV where I live the elevation is about 1000-1500 feet above sea level. Do you guys think I should have the car tuned for the change in air/elevation?
It runs like a beast, but I have noticed some popping on decel, and smells pretty rich at idle. It does have random tech cats btw.
It runs like a beast, but I have noticed some popping on decel, and smells pretty rich at idle. It does have random tech cats btw.
Drifting
Joined: Jan 2004
Posts: 1,419
Likes: 6
From: Alamosa CO
I have a 01 m6 coupe. The car had work done by Next Level Performance, which is in FL. It has afr heads, comp cam, halltech, longtubes, corsa's, etc. It was dyno tuned there at 436rwhp. I purchased the car from a dealer and had it shipped to WV where I live the elevation is about 1000-1500 feet above sea level. Do you guys think I should have the car tuned for the change in air/elevation?
It runs like a beast, but I have noticed some popping on decel, and smells pretty rich at idle. It does have random tech cats btw.
It runs like a beast, but I have noticed some popping on decel, and smells pretty rich at idle. It does have random tech cats btw.
My car was originally tuned at sea level and I live at 7500' elevation, and I don't have any problems with how it runs here other than it being a bit rich at idle. Just drive it and enjoy the power!
Jimbo
Burning Brakes
Joined: Jul 2010
Posts: 959
Likes: 50
From: Peters Colony Republic of Texas
The PCM will adjust to a wide range of atmospheric conditions. 
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
Simple way to remember----
More air------ needs MORE fuel
less air -------needs LESS fuel
In higher altitudes there is less air-- It's less dense (thinner) -so by rights you would have to Remove some fuel --everywhere
Howvever--IF you are still using your STOCK MAF closed loop tune the ECM will self adjust the P/T AFR using your 02's and fuel trims to 14.68 --At WOT your trims should then be
"0" or slightly negative so NO fuel is being added at WOT
At WOT your fuel is being set by the ECM using a combination of your PE table and your
VE table---These commanded AFR's don't self adjust--So in higher altitudes your engine will be running somewhat RICHER at WOT--- It's safe a bit richer is far superior that too LEAN which could cause a lean meltdown---And 1500' is not that big of a change
If your car is a dedicated race car and you want optimum power all the time- then YES you would want to make a fuel correction to get that last little extra HP--But on a D/D ocasional track car---it's a waste of time----
More air------ needs MORE fuel
less air -------needs LESS fuel
In higher altitudes there is less air-- It's less dense (thinner) -so by rights you would have to Remove some fuel --everywhere
Howvever--IF you are still using your STOCK MAF closed loop tune the ECM will self adjust the P/T AFR using your 02's and fuel trims to 14.68 --At WOT your trims should then be
"0" or slightly negative so NO fuel is being added at WOT
At WOT your fuel is being set by the ECM using a combination of your PE table and your
VE table---These commanded AFR's don't self adjust--So in higher altitudes your engine will be running somewhat RICHER at WOT--- It's safe a bit richer is far superior that too LEAN which could cause a lean meltdown---And 1500' is not that big of a change
If your car is a dedicated race car and you want optimum power all the time- then YES you would want to make a fuel correction to get that last little extra HP--But on a D/D ocasional track car---it's a waste of time----
