How are you measuring back pressure? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

RealQuick · 12-10-2016, 12:07 PM

I am looking to log back pressure thru hptuners and was wondering what sensor you guys use for this? This sensor will go on the downpipe to see how much of a restriction my single 3" downpipe is.

thanks!
Jon

Unreal · 12-10-2016, 12:30 PM

Have to drill/tap, then rub a long long piece of copper tube to cool to a pressure transducer.

fif_gen_powa · 12-10-2016, 12:47 PM

why log it, why not just correct it. the optimal downpipe size is 1.25x the turbine wheel exducer. 75mm wheel (~3") needs a 93.75mm (3.7") downpipe

RealQuick · 12-10-2016, 01:53 PM

I have the DP out right now, and figured I could put a fitting in. I am pretty sure I corrected the issue with the cutouts, so fabbing a short section of 3.5" dp is something I don't think I need, but I want to log with cutouts closed vs open anyway just to know.

I understand the basics of mounting one away from the heat, but specifically, what sensor are people using?

ostmike · 12-10-2016, 01:54 PM

Quote:

Originally Posted by RealQuick

I am looking to log back pressure thru hptuners and was wondering what sensor you guys use for this? This sensor will go on the downpipe to see how much of a restriction my single 3" downpipe is.

thanks!
Jon

Drill/tap for a npt fitting, run steel or copper tube to a small section of rubber hose then use a ssi pressure transducer. They are 0-5 or 0-12 volts. Feed that input to you MPVI. Backpressure is always a good thing to check!

RealQuick · 12-10-2016, 02:15 PM

I have seen done 0-5v sensors on eBay, might try one.

stevieturbo · 12-10-2016, 04:18 PM

Just weld a brake pipe fitting onto the side of the pipe, then you can easily make a short bit of copper pipe that screws in and plug it with a nipple when not in use. ( obviously need a flaring tool, but they're cheap and handy to have anyway )

As for sensors, almost any pressure sensor that has the operating range you need should do. But do keep it far enough away from heat etc that you wont kill the sensor.

12-10-2016, 12:07 PM	#1
RealQuick Drives: 2010 Camaro 2SS M6 - Intake/Exhaust Join Date: Sep 2014 Location: Bridgewater Posts: 693	How are you measuring back pressure? I am looking to log back pressure thru hptuners and was wondering what sensor you guys use for this? This sensor will go on the downpipe to see how much of a restriction my single 3" downpipe is. thanks! Jon

12-10-2016, 12:30 PM	#2
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Have to drill/tap, then rub a long long piece of copper tube to cool to a pressure transducer. __________________ Nick Corvette Z06 -1200ish rwhp

12-10-2016, 12:47 PM	#3
fif_gen_powa Drives: 2013 Camaro SS Turbo Join Date: Apr 2014 Location: South Florida Posts: 1,525	why log it, why not just correct it. the optimal downpipe size is 1.25x the turbine wheel exducer. 75mm wheel (~3") needs a 93.75mm (3.7") downpipe __________________ 388ci 91/104 Turbo TH400 8.3@164 https://instagram.com/turbo_ls3/

12-10-2016, 01:53 PM	#4
RealQuick Drives: 2010 Camaro 2SS M6 - Intake/Exhaust Join Date: Sep 2014 Location: Bridgewater Posts: 693	I have the DP out right now, and figured I could put a fitting in. I am pretty sure I corrected the issue with the cutouts, so fabbing a short section of 3.5" dp is something I don't think I need, but I want to log with cutouts closed vs open anyway just to know. I understand the basics of mounting one away from the heat, but specifically, what sensor are people using?

12-10-2016, 02:15 PM	#6
RealQuick Drives: 2010 Camaro 2SS M6 - Intake/Exhaust Join Date: Sep 2014 Location: Bridgewater Posts: 693	I have seen done 0-5v sensors on eBay, might try one.

12-10-2016, 04:18 PM	#7
stevieturbo Drives: it changes Join Date: Nov 2010 Location: Norn Iron Posts: 1,126	Just weld a brake pipe fitting onto the side of the pipe, then you can easily make a short bit of copper pipe that screws in and plug it with a nipple when not in use. ( obviously need a flaring tool, but they're cheap and handy to have anyway ) As for sensors, almost any pressure sensor that has the operating range you need should do. But do keep it far enough away from heat etc that you wont kill the sensor.