Reading Boost

d729596 · 06-28-2018, 08:17 AM

I recently installed my supercharger that included a 3 bar map sensor. I am trying to figure out if a gauge will be able to read boost through the obd 2 connection. Supercharger company said through obd 2 connection it will come through in kpa and needs to be converted to psi. Gauge company says it should come through as bar and they convert it to psi. Any idea on what the answer is? Can I read boost or not?

Omega · 06-28-2018, 08:22 AM

kPa and psi are just units of boost. Manifold pressure can be read off the com bus and most gauges are able to display your boost pressure in kPa or psi.

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EDFHOBBIES · 06-28-2018, 10:36 AM

I can read boost through SCT or live but I subtract 6.8 I think so If it read 18.5 boost I'm really just under 12 psi

Eyefixstuff · 06-28-2018, 10:54 AM

You can read the boost through software, mine logs it on hptuners. But my gauge I use, I actually have it T’ed into the vacuum port coming off of the intake. It’s really accurate it seems, but I would recommend using an analog gauge. My digital one from AEM seems a little slow.

hitmix300 · 06-28-2018, 11:09 AM

On my car, i have a breakout harness so the pcm can see the outside baro pressure and the intake manifold pressure.

I simply use this formula:
intake pressure-baro pressure=boost pressure @ manifold.

see the photo below for my datalog representing both values.

hope this helps in some sorta way.

TJay74 · 06-30-2018, 09:50 AM

Since I added the D1SC to my car I have been going down this route as well, I finally pulled the plug and just ordered a manual Autometer boost gauge for mine. I wish there was a electronic version that worked better.

The shop that did my install said the standard 1 bar MAP is more than able to read boost, the 3 bar isnt needed unless you are going over 30psi.

Omega · 06-30-2018, 10:29 AM

Quote:

Originally Posted by TJay74

Since I added the D1SC to my car I have been going down this route as well, I finally pulled the plug and just ordered a manual Autometer boost gauge for mine. I wish there was a electronic version that worked better.

The shop that did my install said the standard 1 bar MAP is more than able to read boost, the 3 bar isnt needed unless you are going over 30psi.

1 bar = 14.5ish psi. Most people are up near the top end of the 1 bar maps' table so they change to the 3 bar during the upgrade just to avoid future problems. If you're at 12psi and it spikes a bit, you're SOL with the ECU being able to compensate.

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06-28-2018, 08:17 AM	#1
d729596 Drives: 2016 SS Hyper Blue Join Date: May 2017 Location: Motor City Posts: 55	Reading Boost I recently installed my supercharger that included a 3 bar map sensor. I am trying to figure out if a gauge will be able to read boost through the obd 2 connection. Supercharger company said through obd 2 connection it will come through in kpa and needs to be converted to psi. Gauge company says it should come through as bar and they convert it to psi. Any idea on what the answer is? Can I read boost or not?

06-28-2018, 10:36 AM	#3
EDFHOBBIES Dyno Show Queen LOL Drives: 16 SS & 17 ZL1 Both Yellow Join Date: Jan 2014 Location: Houston Posts: 4,345 View My Garage	I can read boost through SCT or live but I subtract 6.8 I think so If it read 18.5 boost I'm really just under 12 psi __________________ Kong Ported 2650, Crawford Racing Port Injection, Weapon X 112mm Adapter, NW112mm TB, Livernois Ported LT4 Heads, Lingenfelter GT32 stealth cam, Haltech Elite, and Carbon by Trufiber

06-28-2018, 10:54 AM	#4
Eyefixstuff Drives: 16’ 2SS A8 HBM Procharged Join Date: Jun 2017 Location: Boston Posts: 410	You can read the boost through software, mine logs it on hptuners. But my gauge I use, I actually have it T’ed into the vacuum port coming off of the intake. It’s really accurate it seems, but I would recommend using an analog gauge. My digital one from AEM seems a little slow. __________________ 16' 2SS A8 Hyperblue \| P1SC-1, Race IC \| JMS fuel pump voltage booster \| Jannetty custom tune \| Elite E2-X catch can \| M017 Wheels

06-28-2018, 11:09 AM	#5
hitmix300 2016 loaded 2SS Drives: Maverick X3 Turbo R Join Date: Feb 2015 Location: United States Posts: 242	On my car, i have a breakout harness so the pcm can see the outside baro pressure and the intake manifold pressure. I simply use this formula: intake pressure-baro pressure=boost pressure @ manifold. see the photo below for my datalog representing both values. hope this helps in some sorta way. __________________ salvage to savage build thread with hellion twins

06-28-2018, 08:22 AM	#2
Omega Drives: G8 Join Date: Mar 2012 Location: NJ Posts: 251	kPa and psi are just units of boost. Manifold pressure can be read off the com bus and most gauges are able to display your boost pressure in kPa or psi. Sent from my Pixel XL using Tapatalk

06-30-2018, 09:50 AM	#6
TJay74 Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016 Location: Norman, OK Posts: 2,424	Since I added the D1SC to my car I have been going down this route as well, I finally pulled the plug and just ordered a manual Autometer boost gauge for mine. I wish there was a electronic version that worked better. The shop that did my install said the standard 1 bar MAP is more than able to read boost, the 3 bar isnt needed unless you are going over 30psi.

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