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Message: <blockquote data-quote="speed2horizon" data-source="post: 4221749" data-attributes="member: 30831">Ok.. first of all, U must kno about A/F aka AFR aka Air Fuel Ratio in order to answer the question. When u decide an upgrade, First u must have to decide a targetted hp. Study and learn. Most importantly, know and understand the item. Best way is ASK/READ.Ok, now back to your question. Assuming u've upgraded/change to TOYOTA 81mm SUPERCHARGER pistons, U should now be achieving 1597cc. Which is equivalent to 4G92. In terms on engine number, U're on 4G91. But in actual calculation, engine is similar to a 4G92. Personal experience, 4G92 with TD04L boosting 1 bar. There are still much allowance to go more... But when U change turbo to a bigger CFM. Simply means, boosting at same 1 bar, U are driving more air into your manifold. In that case, fuel requirement for the same egine on TD04L and TD05 is very much different.However, I'd expect the injectors will serve u well. However, if you are planning to futher up boost in future, It's always wiser to oversize a little. But 510cc for an NA ECU with emanage piggy will expect to be suffering of over rich at the low rpm. because 10% duty cycle for 510cc and a 390cc injectors are also very different, for example, just an example. 1V makes the injector open 10% of the duty cycle in 390cc. It'll still be opening 10% for 510cc. But 10% for 510cc is much higher than a 390cc. Due to the ability of emanage to up/down 20% of a of the stock A/F mapping, the 20% of the 510cc could be out of range. And normally at low end, the pistons might achieve ultra rich cndition. And the idle could be a problem. So, I think 450cc is more than enoughh. And nothing beats a standalone in controlling the injectors with full range.Then 510cc or even 700cc, a stanadalones have fully access to the injectors and remap it yourself. then it's not bounded by the 20% up and down. U write everything ursekf.</blockquote>

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