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Old 02-27-2020, 01:18 PM   #26
Scooby Newbie
Member#: 495630
Join Date: Dec 2018

Originally Posted by WRXnick16 View Post
IDCs start to become a limitation at the top of 4th gear on Stage 2+ setups with the stock injectors.

While this is a "limitation".. how much time does an average street car spend at WOT at ~90-100+ mph?

It just so happens that 4th gear is the most commonly used for dyno tuning and the higher IDCs are observed. Tuners will of course err on the side of caution. They don't want any responsibility (blame) in you potentially running lean, detonating, and experiencing a catastrophic engine failure. They also have to assume the worst of your driving habits (ie maniacally doing extended WOT pulls in excess of 100 mph at sea level in below freezing temperatures when air is the densest despite your their warnings about IDCs with the stock injectors).

I'm not opposed to upgrading the injectors at Stage 2+, but it isn't really necessary for a daily driver unless it's spending weekends doing extended track sessions. If you have the money to burn and it helps you sleep better at night.. then by all means go for it. Or just reach out to a few experienced tuners and ask their opinion. Most will be willing to tune your setup on the stock injectors. They'll just scale power back a bit in the higher gears for safety. For example:
true....cobb datalogs for the sti six speeds are done in 4th gear from 2500 rpm to redline....on my 2006 STI stage 2 I datalog from 2500-7000 RPM and my IDC is around 80% .stock air box though, but with a huge downpipe.
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