Horneteer wrote:

Hi Guys, I've been thinking about this mod and thought I'd do a little experiment.

I got two boost gauges, connected them together and synchronised them so they read the same, using a bicycle pump to control the pressure in the hose.
One gauge was connected to the manifold using a banjo fitting as per the OP, and the other was connected into the wastegate/FIP connector at the turbo. The engine is an ex Disco 200Tdi in a 90, max boost is 15psi reached at 3000rpm and higher.

The Results: Both gauges moved at the same rate and reading 90% of the time. On occasions the turbo gauge was 1 to 2 psi higher than the manifold gauge generally around the 5 to 12psi range. This difference didn't last long as when the turbo gauge stopped climbing the manifold gauge soon caught up.

jst wrote:

i was thinking about this

wastegate off the manifold i can follow so its doesnt open until it sees full boost achieved at manifold (ie closer to inlet)

in essence then we are saying that if pressure is taken at turbo itself its a higher pressure than at the manifold.

so surely FiP is better having that higher pressure sooner to get the pin to depress quicker?

moving it to the manifold would make the FiP pressure feed lazy.

I'm with jst on this point

Conclusion:
If you want to do this mod, and your butt dyno feels a difference, then go ahead and do it. Personally I think I'll leave mine as LR designed it.

 Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

schweps wrote:

Hi Everybody,
I've installed a boost gauge with an easy setup (branch is taken from the pressure line from turbo outlet to injection pump upper diaphram) and an EGT sensor/gauge aswell.
For the time being I'm watching the engine performance. It's a 300tdi without EGR.
According to the service manual, I've to read 13,5 to 15,5 psi with full throttle whilst climbing a hill, steady engine speed around 2500-3000rpm. I can read 15psi values around 3000rpm @3rd, 4th and 5th gears. For 2nd gear, it could barely give 13psi @3000rpm. 1st gear is even worst. I can read 10psi @4000rpm.
Is this normal?
Cheers.
Senol