boost gauge

phum · **Posted:** Sat Feb 23, 2019 7:56 pm

Where would be the best place to tee in a hose for a manual boost gauge?
Thanks
Peter

should mention 2006 KJ crd

WWDiesel · **Posted:** Sat Feb 23, 2019 9:33 pm

phum wrote:

Where would be the best place to tee in a hose for a manual boost gauge?
Thanks
Peter
should mention 2006 KJ crd

I drilled a small hole inside one of the unused threaded bosses on the intake and then tapped it to 1/8 pipe thread to accept a 90 degree brass fitting for the boost gauge tube.
See this thread in the CRD Tech section for full installation details:> viewtopic.php?f=98&t=84670
It works very well! :BANANA:

Picture of boost gauge connection on intake:

layback40 · **Posted:** Sat Feb 23, 2019 10:01 pm

A boost gauge should measure the boost output of the turbo. as such it needs to be on the air outlet of the turbo. Often there is an air line from the outlet side to the wastegate actuator. this will tell you the boost pressure. If you connect on the inlet manifold you are measuring the charge pressure. Many do this. it will give a lower pressure as the air has been forced through the intercooler etc. Its important when quoting pressures to make sure you state boost or charge pressure. WWDiesel is showing the location for a charge pressure gauge.

GordnadoCRD · **Posted:** Sun Feb 24, 2019 12:14 am

That's the way for proper relevant information, and as such, is the same location pressure-wise, that the factory places the MAP sensor.

phum · **Posted:** Sun Feb 24, 2019 2:56 am

Is there nowhere on the turbo side of the engine that I can tee it in? Boost pressure will do me

iakj11 · **Posted:** Sun Feb 24, 2019 10:03 am

Sasquatch sells a port kit for silicon CAC hoses.
https://shop.sasquatchparts.com/products/silicon-hose-port-system/

flash7210 · **Posted:** Sun Feb 24, 2019 11:19 am

I agree that the best placement for the boost gauge port is somewhere in the vicinity of the MAP sensor.

When I made my own aluminum CAC hoses, I plumbed it into the drivers side tube.

WWDiesel · **Posted:** Sun Feb 24, 2019 12:32 pm

layback40 wrote:

A boost gauge should measure the boost output of the turbo. as such it needs to be on the air outlet of the turbo. Often there is an air line from the outlet side to the wastegate actuator. this will tell you the boost pressure. If you connect on the inlet manifold you are measuring the charge pressure. Many do this. it will give a lower pressure as the air has been forced through the intercooler etc. Its important when quoting pressures to make sure you state boost or charge pressure. WWDiesel is showing the location for a charge pressure gauge.

This engine/turbo setup has no wastegate being it is a variable vane turbo. Therefore no location to use as you described!
The location I chose on the intake manifold is reading the exact SAME pressure that the MAP sensor is measuring and providing that information to the ECM which is controlling boost pressure via the variable vanes.
There is no location on the turbo discharge to safely tap into to read discharge pressure other than putting a hole in the boost hose using the Sasquatch port kit or making your own out of metal like Flash did.
There should be very little dp across the CAC if it is clean.
Static pressure from the turbo discharge all the way to the intake valves should be fairly constant at a given vane position provided there are no leaks in the system....

mass-hole · **Posted:** Sun Feb 24, 2019 5:48 pm

flash7210 wrote:

I agree that the best placement for the boost gauge port is somewhere in the vicinity of the MAP sensor.

When I made my own aluminum CAC hoses, I plumbed it into the drivers side tube.

Same here, along with an IAT sensor since I believe the MAP sensor is heat soaking pretty bad, which it is.

mass-hole · **Posted:** Sun Feb 24, 2019 5:56 pm

iakj11 wrote:

Sasquatch sells a port kit for silicon CAC hoses.
https://shop.sasquatchparts.com/products/silicon-hose-port-system/

Wow. That looks just like Silicone intake's port that sells for $14.99.

http://www.siliconeintakes.com/index.php?products_id=500

layback40 · **Posted:** Sun Feb 24, 2019 11:24 pm

mass-hole wrote:

Same here, along with an IAT sensor since I believe the MAP sensor is heat soaking pretty bad, which it is.

I think you will find the MAP sensor is a temp sensor as well as pressure. The full spec is on the Bosch motorsport web site.

I just made the comment that the pressure people are suggesting is the charge pressure, not the boost pressure. The MAP sensor signal is used to set injection details ~ engine RPM/pressure/temp is an alternate to MAF. It was used on the last of the XJ diesels as well.
If you wanted to you could use a signal from it to give the charge pressure &
so avoid needing a mechanical gauge.
I have not looked at the outlet pipe on the air side today to see if a small hole could be drilled & tapped like on standard turbos.

GordnadoCRD · **Posted:** Mon Feb 25, 2019 7:56 am

layback40 wrote:

mass-hole wrote:

Same here, along with an IAT sensor since I believe the MAP sensor is heat soaking pretty bad, which it is.

I think you will find the MAP sensor is a temp sensor as well as pressure. The full spec is on the Bosch motorsport web site.

I just made the comment that the pressure people are suggesting is the charge pressure, not the boost pressure. The MAP sensor signal is used to set injection details ~ engine RPM/pressure/temp is an alternate to MAF. It was used on the last of the XJ diesels as well.
If you wanted to you could use a signal from it to give the charge pressure &
so avoid needing a mechanical gauge.
I have not looked at the outlet pipe on the air side today to see if a small hole could be drilled & tapped like on standard turbos.

It's possible, but with the LHD engines, it's already severely crowded on the exhaust side, and all that extra heat would necessitate copper line, whereas the intake side uses plastic line with no problems.

WWDiesel · **Posted:** Mon Feb 25, 2019 3:35 pm

GordnadoCRD wrote:

layback40 wrote:

mass-hole wrote:

Same here, along with an IAT sensor since I believe the MAP sensor is heat soaking pretty bad, which it is.

I think you will find the MAP sensor is a temp sensor as well as pressure. The full spec is on the Bosch motorsport web site.
I just made the comment that the pressure people are suggesting is the charge pressure, not the boost pressure. The MAP sensor signal is used to set injection details ~ engine RPM/pressure/temp is an alternate to MAF. It was used on the last of the XJ diesels as well.
If you wanted to you could use a signal from it to give the charge pressure &
so avoid needing a mechanical gauge.
I have not looked at the outlet pipe on the air side today to see if a small hole could be drilled & tapped like on standard turbos.

It's possible, but with the LHD engines, it's already severely crowded on the exhaust side, and all that extra heat would necessitate copper line, whereas the intake side uses plastic line with no problems.

X2
Charge Air, Boost Pressure, it's all just a simple case of terminology or semantics.

I believe the pressure will be static at a given turbo vane angle all the way from the turbo discharge to the valve intakes.
While driving mine yesterday, I paid especially close attention to the amount of time between depressing the go pedal and the boost pressure increasing on the gauge and it was almost instantaneous. Like the blink of an eye!

mass-hole · **Posted:** Mon Feb 25, 2019 6:50 pm

layback40 wrote:

mass-hole wrote:

Same here, along with an IAT sensor since I believe the MAP sensor is heat soaking pretty bad, which it is.

I think you will find the MAP sensor is a temp sensor as well as pressure. The full spec is on the Bosch motorsport web site.

I just made the comment that the pressure people are suggesting is the charge pressure, not the boost pressure. The MAP sensor signal is used to set injection details ~ engine RPM/pressure/temp is an alternate to MAF. It was used on the last of the XJ diesels as well.
If you wanted to you could use a signal from it to give the charge pressure &
so avoid needing a mechanical gauge.
I have not looked at the outlet pipe on the air side today to see if a small hole could be drilled & tapped like on standard turbos.

Yes, they are the same. The issue is the MAP sensor is bolted onto an aluminum manifold and it picks up heat that is not in the air stream. I see temperature 20-30°F cooler with my IAT sensor just before entering the manifold than the TMAP pics up. Hotter temperatures result in lower fueling in some cases. The tune compensates for air density in a sense. If you have 2300 mbar pressure at 80°C then the ECU will deliver less fuel than 2300 mbar at 30°C.

DieselJeepLuvr · **Posted:** Fri Mar 01, 2019 2:02 am

mass-hole wrote:

iakj11 wrote:

Sasquatch sells a port kit for silicon CAC hoses.
https://shop.sasquatchparts.com/products/silicon-hose-port-system/

Wow. That looks just like Silicone intake's port that sells for $14.99.

http://www.siliconeintakes.com/index.php?products_id=500

Gotta love free enterprise! :ROTFL:

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