H22 turbo with S300; MAP reads 4.xx psi on startup

Mikey3000 · Post by **Mikey3000** » Mon Apr 03, 2006 4:13 am

i'm pretty damn sure i have the 3 bar SVE map sensor wired correctly. is there something i need to change? i changed my map to custom and the voltage parameter looks about right. is there any other map parameter that i need to change?

Post by **Spunkster** » Tue Apr 04, 2006 9:54 am

sounds like you have the wrong scaler offsets. You will have to look int eh Help, Contents and search for "map scaler". There are very detailed instructions on how to calculate this.

Mikey3000 · Post by **Mikey3000** » Thu Apr 06, 2006 4:50 am

the map sensor says it should read 1.65V @ atm pres. so i did some hardcore math and found the scalar and offset to be 881 and -440 respectively, which netted me a 1.651V@atm pres. i uploaded this to my ecu and the motor didn't like it. so i went back to the motec 3 bar which is 1.66V@atm pressure and the motor loved it but my map sensor still reads ~4 psi at idle. why is there such a big difference in the way the motor responds to the 1.651V and the 1.66V?

Post by **Spunkster** » Thu Apr 06, 2006 11:13 am

If you plug the stock map sensor in what does it read at idle?

Mikey3000 · Post by **Mikey3000** » Thu Apr 06, 2006 3:40 pm

there's no turning back to the stock map now with the installation of the SVE 3 bar.

Post by **Spunkster** » Fri Apr 07, 2006 9:11 am

Well you need to do this. It is part of the troubleshooting process.

Mikey3000 · Post by **Mikey3000** » Sun Apr 16, 2006 12:39 pm

its all good my car just made 505 hp losing traction on the dyno @ 16 psi

x2gold · Post by **x2gold** » Mon May 22, 2006 6:31 pm

nice numbers...esp @ 16 psi.. keep up the good work.