I get asked this a lot so thought it worthwhile to have a rule of thumb thread for injector upgrades for various power levels . I'm basing this on personal experience rather than calculations because I've actually hit the max. output on various injector combinations over the years so have a good idea on what actually works .
As you will see , you can reach any power level the Renesis is capable of (to date) using just the stock injectors that came on the series one engines .
I haven't included any other types of injectors .Although I've tuned cars with various aftermarket injectors successfully , I've always found them to be harder to tune than the stockers (due to uncertainty of latency numbers mainly)so I really don't see the need to spend your hard earned money when you could get an excellent result using what you already have or have easy access to .
The stock injectors that come with a series 2 would be a good alternative also but to date I haven't done any experimenting with them.
As far as injector outputs go , I believe the scaled output figure used in the ECU is actually a fairer indication of injector output than what you get from a flow test which is done at a lower pressure than our system pressure, so that's what I'm using here.
Injectors listed In this order: P1/secondary/P2
Stock injectors
red/yellow/yellow .............................369/475/475 x2 = 2638cc = up to 270whp
good for a stock greddy turbo kit
Stage 1:
yellow/yellow/blue .............................475/475/626 x2 = 3152cc = up to 320whp
Upgraded greddy turbo
Stage 2:
yellow/blue/uncapped yellow................475/626/850 x2 = 3902cc = up to 390whp
Most kit turbos
Stage 3:
Blue/uncapped yellow/uncapped yellow 626/850/850 x2 = 4652 = up to 450whp
Custom turbo systems
In general it's best to put identical injectors in secondary and P2 as they share the same latency map . The latency difference between yellow and blue and between blue and uncapped yellow is small enough however, that this doesn't detract too much from the result. I would split the difference between the two maps for best results.
For Uncapped yellow injectors add 10% to all the numbers in the blue injector latency map for best results .
As you will see , you can reach any power level the Renesis is capable of (to date) using just the stock injectors that came on the series one engines .
I haven't included any other types of injectors .Although I've tuned cars with various aftermarket injectors successfully , I've always found them to be harder to tune than the stockers (due to uncertainty of latency numbers mainly)so I really don't see the need to spend your hard earned money when you could get an excellent result using what you already have or have easy access to .
The stock injectors that come with a series 2 would be a good alternative also but to date I haven't done any experimenting with them.
As far as injector outputs go , I believe the scaled output figure used in the ECU is actually a fairer indication of injector output than what you get from a flow test which is done at a lower pressure than our system pressure, so that's what I'm using here.
Injectors listed In this order: P1/secondary/P2
Stock injectors
red/yellow/yellow .............................369/475/475 x2 = 2638cc = up to 270whp
good for a stock greddy turbo kit
Stage 1:
yellow/yellow/blue .............................475/475/626 x2 = 3152cc = up to 320whp
Upgraded greddy turbo
Stage 2:
yellow/blue/uncapped yellow................475/626/850 x2 = 3902cc = up to 390whp
Most kit turbos
Stage 3:
Blue/uncapped yellow/uncapped yellow 626/850/850 x2 = 4652 = up to 450whp
Custom turbo systems
In general it's best to put identical injectors in secondary and P2 as they share the same latency map . The latency difference between yellow and blue and between blue and uncapped yellow is small enough however, that this doesn't detract too much from the result. I would split the difference between the two maps for best results.
For Uncapped yellow injectors add 10% to all the numbers in the blue injector latency map for best results .
Brettspeed Injector upgrades for turbo
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