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Discussion Starter #1
I am considering upgrading my stock cams to the 1JZ 264's and was wondering if I have to retune my car all over again? I currently have 720cc injectors with a complete fuel system plus emange.
 

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yes, increased lift and duration means a different amount of air being ingested into the engine at different rpm's therefore fuel will need to be adjusted.
 

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Discussion Starter #3
Thanks for responding. I have heard that it is not worth upgrading to the 264's unless you are able to raise the rev limiter? Should I just stay with the stock cams? Due to the fac that my rev limiter starts at 7200 will I still be able to maximize the 264 1J cams?
 

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I could rev my 1jz on the stock ecu to 7500 before it hit the limiter?? I think 264s will extend the power band to ~ 7000 rpms then the power will start to fall..
 
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