Vortech with Hi Flow Cats - DO I NEED A NEW TUNE
11-13-2008, 02:28 PM
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Vortech with Hi Flow Cats - DO I NEED A NEW TUNE
Just as it is stated in the title. I have a 2004 6mt G35 with a vortech SC. I replaced the factory pulley to a 3.12 pulley a have a custom tune. I am thinking about removing my factory cats and replacing with a Hi Flow Cat. Do I need to retune the car, or I can get away with the old tune. Thanx
11-13-2008, 02:32 PM
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i would get it re tuned because thats just me ... i like to know i am getting as much power as i can. But freeing up the exhaust more you are going to maybe lose a little psi which will chng your tune.
If you already have a tune your shop should re tune it cheap due to not taking more than a hour to re tune.
If you already have a tune your shop should re tune it cheap due to not taking more than a hour to re tune.
11-13-2008, 02:48 PM
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I am getting the afr wideband installed tomorrow, I was thinking to kill 2 birds with one stone.
The guy who tuned the car is about an hour away from me and he'll probably charge me the full price to retune it. I am guessing it is not even worth it to do all that work for a few ponies.
The guy who tuned the car is about an hour away from me and he'll probably charge me the full price to retune it. I am guessing it is not even worth it to do all that work for a few ponies.
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11-14-2008, 01:57 PM
#9
i recently removed my aps 2.5" test pipes and installed my 2.25" high flow cat's. did not retune, monitored my AFR's through out the power band and everthing looks ok. ( 11.0 to 11.5 AFR's ) did not alter timing, it is running like a champ! also picked up a bit of low end tourqe and lost minimal high rpm power. it is more enjoyable to drive now. a little more tourqe and no exhaust rasp....
12-22-2008, 03:39 AM
#10
i recently removed my aps 2.5" test pipes and installed my 2.25" high flow cat's. did not retune, monitored my AFR's through out the power band and everthing looks ok. ( 11.0 to 11.5 AFR's ) did not alter timing, it is running like a champ! also picked up a bit of low end tourqe and lost minimal high rpm power. it is more enjoyable to drive now. a little more tourqe and no exhaust rasp....
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