Can you help me to scale the current bigger injectors that I have with the ECU flash? If you are busy I understand
I can't do that for you over the forums. You need to be able to log your LTFTs and then do this process:
You scale it to a lower number compared to the new injector size, not the old injector size. The larger the injector, the larger the percentage difference. For example: stock 4 cylinder injectors are 240cc's and the injector scale is set to 232. That's about 3.5% lower. I am running 450cc's and my injector scale is 401. That's a little over 12% lower. Get it?
First, since you are puting in larger injectors, they take longer to open then smaller injectors. So, you have to change the latency values. I havent come up with a systematic way of doing this, but making your values 0.1 lower across the board should put you in the ballpark for your injectors.
After you do that, set the injector scale to a lower value than the new injector size. 5% lower is a good place to start. Now monitor idle fuel trims. Just make sure your long term fuel trims are 0% and your short term are with +- 10%. Once you get it in that ballpark, go for a drive. Cruising fuel trims are what you need to tune for, not idle. Adjust the value as needed to maintain 0% long term and as close to 0% short term as possible. Less than +-5 percent is great. Anything other than 0% long term in not acceptable.
After you get that straight, monitor the car at idle again. If the short term are a little out of whack, use the injector latency settings to get them as close to 0% as possible. Again, anything other than 0% long term is unacceptable.
While you are doing all of that, make sure you aren't messing with any other parameters. That's all there is to it.