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I also added roughly 90 horsepower to the car today at 37.5 PSI boost. I did this by wiring a 4.3 volt Zener diode into the MAP sensor where the boost pressure is calculated. This modification tricks the ECU into thinking it is only taking in a safe amount of boost since anything over 14 PSI or so will trigger limp mode which cuts fuel to the engine to save it. Before it would boost to about 8 PSI and max out at 10 or so if I pushed it. The car now boosts to 16 - 22 PSI with spikes to almost 40 PSI. This causes an insanely high air to fuel ratio when boosting above 22 PSI as the car thinks it is only getting about 11 PSI maximum.
So anyhow, $1.69 for an additional 92 horsepower, not bad at all! I can spin tires in first, second and a bit in third. Weight to power ration hit 10.8 pounds per HP today.
This is not very productive though with fuel usage so I will be using the higher boost levels to around 16 PSI with a leaned out AFR that is still in the safe zone to avoid melting pistons or anything. The added power at highway speed will hopefully translate to being able to hold a lower speed in 5th gear while still reaping MPG.
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