formula to covert MAP voltage to boost reading in HP Tuners
#1
TECH Addict
Thread Starter
formula to covert MAP voltage to boost reading in HP Tuners
I have a GM 2 bar map part # 12569241 that came with my alkycontrol kit.
I would like to monitor it's output in tuners and convert that into a "boost" pid
has anybody done this yet? if so is there a table or formula you could share.
thanks!
I would like to monitor it's output in tuners and convert that into a "boost" pid
has anybody done this yet? if so is there a table or formula you could share.
thanks!
#5
TECH Addict
Thread Starter
Found more time to search around and I think I found what I needed.
Any clever ideas on how to verify how accurate this is?
Gonna be pretty tough to watch the guage and the pc at the same time
The chart below describes the pressure-to-voltage relationship of the stock GM Turbo MAP sensor (2 bar):
Manifold Pressure
(relative sea level / absolute) 2 Bar
MAP Output
14.31psi / 29.01psi 4.90V
14.00psi / 28.70psi 4.84V
13.00psi / 27.70psi 4.67V
12.00psi / 26.70psi 4.50V
11.00psi / 25.70psi 4.33V
10.00psi / 24.70psi 4.16V
9.00psi / 23.70psi 3.99V
8.00psi / 22.70psi 3.82V
6.00psi / 20.70psi 3.47V
4.00psi / 18.70psi 3.13V
2.00psi / 16.70psi 2.79V
0.00psi / 14.70psi 2.45V
5.00inHg / 12.24psi 2.03V
10.00inHg / 9.78psi 1.61V
15.00inHg / 7.33psi 1.19V
20.00inHg / 4.87psi 0.77V
25.00inHg / 2.41psi 0.35V
29.10inHg / 0.40psi 0.02V
Any clever ideas on how to verify how accurate this is?
Gonna be pretty tough to watch the guage and the pc at the same time
The chart below describes the pressure-to-voltage relationship of the stock GM Turbo MAP sensor (2 bar):
Manifold Pressure
(relative sea level / absolute) 2 Bar
MAP Output
14.31psi / 29.01psi 4.90V
14.00psi / 28.70psi 4.84V
13.00psi / 27.70psi 4.67V
12.00psi / 26.70psi 4.50V
11.00psi / 25.70psi 4.33V
10.00psi / 24.70psi 4.16V
9.00psi / 23.70psi 3.99V
8.00psi / 22.70psi 3.82V
6.00psi / 20.70psi 3.47V
4.00psi / 18.70psi 3.13V
2.00psi / 16.70psi 2.79V
0.00psi / 14.70psi 2.45V
5.00inHg / 12.24psi 2.03V
10.00inHg / 9.78psi 1.61V
15.00inHg / 7.33psi 1.19V
20.00inHg / 4.87psi 0.77V
25.00inHg / 2.41psi 0.35V
29.10inHg / 0.40psi 0.02V
#7
8 Second Club
iTrader: (34)
Those numbers worked fine for me. I dont know if you can do a lookup table or calculated stuff in HPt, never tried it in HPt.
I also had to run a restrictor in the line for the map sensor, I had a 1/4" line going to it and it would jump all over the place. You can see it with and w/o the restrictor in these two pics.
It also reads about 1psi higher then the boost gauge in the car using a hand vacuum/pressure pump pressuring both the MAP and the in-car gauge at the same time. I just use the MAP to compare between runs/days/weather/belt slip, not for absolute accuracy. I could fix it reading a little high but I dont know which is off exactly, the boost gauge in the car, the pressure gauge on my mityvac or the MAP sensor output But using a DMM those voltages do check out right at the MAP.
I also had to run a restrictor in the line for the map sensor, I had a 1/4" line going to it and it would jump all over the place. You can see it with and w/o the restrictor in these two pics.
It also reads about 1psi higher then the boost gauge in the car using a hand vacuum/pressure pump pressuring both the MAP and the in-car gauge at the same time. I just use the MAP to compare between runs/days/weather/belt slip, not for absolute accuracy. I could fix it reading a little high but I dont know which is off exactly, the boost gauge in the car, the pressure gauge on my mityvac or the MAP sensor output But using a DMM those voltages do check out right at the MAP.