pussy

I finish installing my greddy kit on my car but i have a greddy pressure sensor left over. I really don't know what it does. Do i need it install?

Torque Obsessed

The pressure sensor is used to measure boost pressure. You only need this if you are running high boost >10psi. (The OEM map sensor can't read above 10.7psi.) If you're running less than that you won't need it.

s2konroids

No, install the greddy pressure sensor with a small inline fuel filter. The oem map sensor fluctuates too much leading to a less smooth tune.

pussy

thanks. greddy pressure sensor just plugs into any vacuum line right?

Torque Obsessed

It's true that some people have seen fluctuations in the readings of the OEM sensor. That's why Greddy gives you the little hose to relocate it. Some owners have had success with inserting a restrictor in the line to dampen the pressure waves. I found that my car ran better just using the OEM sensor in the OEM location when I was running the Greddy turbo kit.

The Greddy sensor can read a lot higher, but its voltage readings are more coarse, meaning it doesn't give you as accurate or fine level of detail when reading boost levels. It's a tradeoff - the OEM sensor can't read as high, but it gives more accurate readings within the range it can read. We've also seen the same fluctuations in the readings from the Greddy pressure sensor as with the OEM sensor, depending on where/how it was installed.

Now that I'm running 15.5psi on a supercharged setup, I followed the suggestions of several other people and am running both sensors. The OEM sensor is clamped at 2.85 volts in the EMU so that it doesn't read anything while in boost. Here's a pic of how my Greddy sensor is installed, which was recommended by other owners as a good location to minimize the fluctuations.

KnowledgeIsPower

can you elaborate on how youre using both sensors?

s2konroids

Because he needs to use the map sensor for partial throttle to keep the stock ECU happy, and clamp the voltage so it doesn't read boost which the stock ECU doesn't like/cant deal with. Effectively the stock sensor is used to 0psi then >0 psi the greddy boost sensor is used.

KnowledgeIsPower

Thank u! I have the greddy turbo and emanage ult seyup and am looking into this sensor. But am not sure if it's pnp. I run <10 psi but sometimes if I spike more than 10 I throw codes. I figure that's because stock sensor only reads to 10psi so if this sensor will help its worth it. But I have little knowledge base when it comes to this and how to apply it to my setup

KnowledgeIsPower

bumping for my use later. I need to research more on this. i have a vacuum block, which im assuming would make things much easier to tie into?

my car spikes past 10psi with the greddy kit sometimes (which i now understand to be "ok"), but i want to be able to handle the spike and dial in my tune to hold right at the 10psi.

with that, I'm assuming I'll be safer getting aftermarket sensor that will read above the 10psi.