Tune changes when adding long tubes?
Thread Starter
Melting Slicks
Joined: Apr 2010
Posts: 2,133
Likes: 0
From: Pittsburgh PA
Tune changes when adding long tubes?
What are the changes that normally need made to the tune when adding long tubes with hi flow cats?
I have HPS Tuners Pro and had a custom dyno tune done by Ed Hutchings previously. I plan to have the car dyno'd and send the logs to him but was curious what changes are almost always needed when doing the headers?
Thanks in advance!
I have HPS Tuners Pro and had a custom dyno tune done by Ed Hutchings previously. I plan to have the car dyno'd and send the logs to him but was curious what changes are almost always needed when doing the headers?
Thanks in advance!
Racer
Joined: Feb 2008
Posts: 326
Likes: 0
From: Norman OK
Not much. Dial the air fuel back in if it has changed. I have seen some setups take another degree or two of timing with less restriction in the exhaust.
With hi flow cats you probably want to turn off all the bank 2 o2 codes because they can trip sometimes. May need to kill the cat efficiency code too.
I usually dial back the cat over temp enrichment with hi flows. Something around half what the factory is.
With hi flow cats you probably want to turn off all the bank 2 o2 codes because they can trip sometimes. May need to kill the cat efficiency code too.
I usually dial back the cat over temp enrichment with hi flows. Something around half what the factory is.
Thread Starter
Melting Slicks
Joined: Apr 2010
Posts: 2,133
Likes: 0
From: Pittsburgh PA
Not much. Dial the air fuel back in if it has changed. I have seen some setups take another degree or two of timing with less restriction in the exhaust.
With hi flow cats you probably want to turn off all the bank 2 o2 codes because they can trip sometimes. May need to kill the cat efficiency code too.
I usually dial back the cat over temp enrichment with hi flows. Something around half what the factory is.
With hi flow cats you probably want to turn off all the bank 2 o2 codes because they can trip sometimes. May need to kill the cat efficiency code too.
I usually dial back the cat over temp enrichment with hi flows. Something around half what the factory is.
Thread Starter
Melting Slicks
Joined: Apr 2010
Posts: 2,133
Likes: 0
From: Pittsburgh PA
Thread Starter
Melting Slicks
Joined: Apr 2010
Posts: 2,133
Likes: 0
From: Pittsburgh PA
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