Re:Zener Diode Mod to MAP sensor signal
 

Just installed the diode, works ok, cel dont come on til like 7k now so i lowered the boost gonna take it out and see how it is and most likely go with a lower voltage so see if that makes a difference. test and tune since there only a buck a piece.

Re:Zener Diode Mod to MAP sensor signal
 

TurboCivicSiR21, this is good news. When I did my last dyno test, I told the tuners to use 6500rpm as the rev imit (stock limit is 7200rpm). The check engine light came on many times. So, based on your experience, I will be fine since the check engine light does not come on until 7K.

Did you use the 4.3 or the 4.7 volts diode?

Re:Zener Diode Mod to MAP sensor signal
 

I used the 4.3 but i think im gonna try maybe a 4.0. i can actually go through 1st and 2nd with no cel but then in 3rd it comes on still. It will come on also if im cruisin in a high gear at low rpm's and just hit the gas a little bit and the cel comes on but im still messin with it.