Could higher PSI = Slower car?

[oplix]

I have a Evo 3 16G on a stock fuel system. I upped the boost a tiny bit a few days ago because it was at 14psi and I can run at 15psi without fuel cut or detonation. I might not have noticed this before but 15psi almost seems slower than 14psi.

Could it have something to do with the timing getting pulled because of the AFR being too lean?

 

[Boost92awd]

It very well could be. I logger will tell you whats really going on.

 

[oplix]

don't have one right now ><

 

[JusMX141]

Unless something is seriously wrong, you won't experience detonation without first experiencing knock.

What you're describing sounds to be the symptoms of undiagnosed knock....you're increasing boost so the car is running out of fuel, and becoming dangerously lean. The ECU then responds by pulling timing a degree or two in order to save the engine.

You're right in assuming the 15psi with a degree of two or timing taken out is slower than 14psi on the stock timing curve. This loss in power will become even more noticeable with higher boost...it'll feel like you're pulling a trailer. You'll hear the turbo spooling, but the car won't feel like it's going anywhere.

Until you get a logger, back the boost down to a safe level....even 14psi is pushing it on the stock fuel system with an Evo III 16G and no logger. When logging a 2G, you can't log actual knock counts so you'll have to keep an eye on the timing curve and look for sudden drops under load.