Running Rich at High VS Low RPM [HPA Q&A]

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Should you run as rich when you're at sustained high RPM as when you are lower in the rev range? The answer to this leads into why you shouldn't actually run the same air fuel ratio across all your load and RPM range.
This is just one question taken from an Introduction to Reflash Tuning lesson using HP Tuners, however the knowledge will apply to other platforms.
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[@grahamerosewarne6656]

That's a really understanding of what you should really do. Another informative blog from HPA. Aussie Cousin.👍💯🙏👏🇦🇺

[@bradleybatt1401]

Thanks for the lesson Andre. Really clear-cut no bs straight to the point.

[@erikarevalo1874]

Thank you for all this good knowledge bro💯

[@CazzEdits]

My eco seems to begin running rich once I start going above 5k rpm, quite noticeable after a few pulls. Can definitely smell it. Is this normal, or should I consider getting a tune?

[@hpa101]

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[@michaelallen2501]

Any way to simulate these kinds of tests on the street? I don't have access to a dyno.

[@hpa101]

Hey Michael, this is a lesson that will help you start heading in that direction - www.hpacademy.com/previous-webinars/268-dyno-tuning-without-a-dyno/? - Taz.

[@ryanscanlan9875]

Great lesson as always boys. So are you saying add fuel vs retarding timing at high rpm is better generally or is it very engine dependant??
I'm tuning a vq35hr.

[@styrex4261]

generally i would do both, with turbo/supercharged engines it’s needed even more to keep the cylinders cooler. power maximizing will be dependent on the fuel and engine.

[@ryanscanlan9875]

​@@styrex4261 Thx for the answer brother. My tune is VQ 35HR - NA 350z 6spd running 98. Do you think it might still apply??

[@zac2384]

I say add fuel, if it keeps knocking take a degree out. Timing is what makes power but fuel is what allows that power to be made

[@gstevie97]

@@ryanscanlan9875 More ignition advance (adding timing) generally makes more power until you reach the point where you’re causing knock. If you aren’t knock limited, you can also advance the timing so much that the engine loses power because the combustion force resisting the piston coming up during the compression stroke begins to outweigh the benefits of having a more complete combustion when the piston is at TDC and going down on the power stroke. Adding fuel helps avoid knock so you can find the ideal timing for torque production. There are also limits to how much additional fuel will help. Finding the balance of timing and fuel is where you need to gradually change things and experiment on your specific engine. You should be able to find what other people found to work when tuning VQs and go from there.

[@ryanscanlan9875]

@@gstevie97 That helps mate, thank you!

[@TheSol115]

👏👏👏👏

[@hell2danawx239]

Real question is wtf was that he got on his head bro?! Shii it was only a matter of time yall😭😭😭