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21st October 2015, 02:05 AM
#1
Expert
Boost gauge install
Had a guy install my boost gauge and I'm wondering if he tapped into the right place for a reading. He tapped a thread into the intake manifold just past the turbo. This seemed a bit odd but he was insistent that that was the best location to pick up the boost. I thought you simply picked it up from the vacuum line running from the injector pump to the turbo?
Can someone clear this up for me? Did he do it right or do I need to tee into the vacuum hose? Here's the picture of what he did and the instructions for the gauge install.
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21st October 2015 02:05 AM
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21st October 2015, 08:38 AM
#2
Patrol God
Which engine do you have again??
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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21st October 2015, 12:51 PM
#3
Expert
Mine is the RD28Ti in a 99 GU.
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21st October 2015, 12:58 PM
#4
Patrol God
not familiar with that motor , but if its on the boost side why not.
On my mighty ZD30 they drilled and tapped a hole under the ic.
Im changing that to a plate that fits under the OE boost sensor
neater imo
Heat that tubing up in a cup of hot water , you'll be able to push it on further
maybe even use small cable ties
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
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The Following User Says Thank You to threedogs For This Useful Post:
SiberianPatrol (21st October 2015)
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21st October 2015, 01:05 PM
#5
Expert
Originally Posted by
threedogs
not familiar with that motor , but if its on the boost side why not.
On my mighty ZD30 they drilled and tapped a hole under the ic.
Im changing that to a plate that fits under the OE boost sensor
neater imo
Heat that tubing up in a cup of hot water , you'll be able to push it on further
maybe even use small cable ties
I'll be taking it for a drive today when he's done to see if it works right. If it doesn't, I'll cap off that hole and tee into the vacuum hose. Does you boost gauge register when you just rev the engine or do you have to be driving it under load to get an accurate reading?
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21st October 2015, 05:45 PM
#6
Expert
Took it for a drive around the city and it sits around 5psi accelerating about 1/2 throttle. If I really punch it, it jumps to 9.5-10psi. Haven't taken it out on the highway yet because I need to replace my front hub seals. Does this seem like it's reading the right boost #s for the 2.8?
1999 GU RD28Ti turbo diesel; manual transmission; 33" Khumo mudders; ... more mods on the way
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21st October 2015, 06:54 PM
#7
Sounds right
Light load should be around 3 to 5 psi full load and say over 2,000 rpm then 8 to 10 psi
so looks good
regards
Joe
2010-DX Patrol Dual Cab Chassis, Front LOKKA, 3500kg GVM, 4.8 front brakes! (now stops like it should!), 4.625 Diffs (now drives like it should) 35"Mud tires, 3"exhaust, Rear air bags
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The Following User Says Thank You to JoeG For This Useful Post:
SiberianPatrol (21st October 2015)
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21st October 2015, 08:37 PM
#8
Expert
Originally Posted by
JoeG
Sounds right
Light load should be around 3 to 5 psi full load and say over 2,000 rpm then 8 to 10 psi
so looks good
regards
Joe
Thanks, Joe. Since everything is mechanical on the 2.8, am I correct in assuming that there isn't any way to increase the boost since it is vacuum controlled and not controlled by the ECU?
1999 GU RD28Ti turbo diesel; manual transmission; 33" Khumo mudders; ... more mods on the way
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22nd October 2015, 08:51 AM
#9
Ther is no way to increase the light load boost as that is a function of exhaust gas flow.
However the boost at full load and higher gas flows can be controlled by a variable restrictor.
typicaly a Daws valve and needle valve.
do a search on this and think about it.
Regards
Joe
2010-DX Patrol Dual Cab Chassis, Front LOKKA, 3500kg GVM, 4.8 front brakes! (now stops like it should!), 4.625 Diffs (now drives like it should) 35"Mud tires, 3"exhaust, Rear air bags
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The Following User Says Thank You to JoeG For This Useful Post:
SiberianPatrol (22nd October 2015)
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22nd October 2015, 01:56 PM
#10
Expert
Originally Posted by
JoeG
Ther is no way to increase the light load boost as that is a function of exhaust gas flow.
However the boost at full load and higher gas flows can be controlled by a variable restrictor.
typicaly a Daws valve and needle valve.
do a search on this and think about it.
Regards
Joe
Thanks again, Joe. I have a Dawes valve that I was going to install but it wasn't making much sense as to how it worked to increase boost. Need to do some more research. There's not much chance of boost spiking so I don't need to restrict the boost. Just didn't know if I could increase it by a couple of points.
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