mos90

im just making sure everything is working properly, what range should the map sensor voltage be ?

conv90

Voltage?
My KPa readings are with stock cam (not you case)
idle in park or nutral: about 34 or 35 Kpa at 775rpm
idle in D with brake pedal on: about 43 or 44 Kpa at 675 rpm
At KOEO: 99,9 kpa
at WOT : up to 99,8 kpa

HTH
-Beppe-

mos90

my scanner shows the map sensor voltage, not kpa. not sure how to convert..

kittmaster

The voltage should swing between 5V to .5V between full throttle to idle

(shooting from memory)

Chris

Mo_Bandy

If you are supercharged the stock map will read up to 104 KPA but he above KPA and voltages are correct...

Mo

bobmic93

Never heard of kpa . What does it mean?

Mo_Bandy

KPA is Kilopascals it is metric for pressure readings 100 Kilpascals =14.7 psi or atmosheric pressure

21" Hg = ~30 Kpa

18" Hg = ~40Kpa idle

15.5 " Hg = ~50 Kpa

10 " Hg = ~70 Kpa part acceleration

7" Hg = ~80 Kpa harder acceleration

4" Hg = ~90 Kpa vitrually wide open throttle

0" Hg = 100 Kpa WOT

" Hg is inches of mercury
Hope this helps...

Mo

conv90

Since you have a 91 (mine is a 90) you have an $8D code.
The $8D code outputs the MAP sensor ADC counts. This can be converted to a voltage by:

VOLTS = ADC * (5/255)

To convert from ADC counts to KPa I use:

KPa = ADC * 0.369 + 10.415

-or-

(KPa = ADC * 0,369 + 10,415)

-Beppe-

REDC4CORVETTE

I would replace it you are running a 150 shot of Nitrous!
With your mods you should be almost in the 10's It's a cheap part and easy to replace.