Dawes Settings and Altitude

[Snow Patrol]

I live at about 900m above sea level and have my Dawes valve set to about 16 psi. I notice when I go down to the coast that reading will increase to as much as 18 to 19 psi. Now I know that atmospheric pressure is greater at the coast causing the increase and I have to stop and wind back the Dawes about half a turn which gets it back to acceptable levels. I have experienced an over boost engine code on the odd occasion I don't do this. Car performs well at home at my original setting. I also noticed that egts are down a lot further at the coast.

I guess what I am asking is there an easier way to do this or do I have to re tune every trip to lower altitudes.

[threedogs]

18-19 psi is not high for the ZD30 Di motor, Im running 20ish
with no problems.
Leave it as is unless its going into limp mode??

[Snow Patrol]

Yeah it did go into limp yesterday. I should have mentioned its a CRD.

[threedogs]

Yeah it did go into limp yesterday. I should have mentioned its a CRD.

Maybe back the dawes off a touch to avoid limp mode and see how that goes
have you blocked the EGR?

[mudski]

Time to look up the "how to" maf voltage mod. Then say bye bye to limp mode.

[Snow Patrol]

Maybe back the dawes off a touch to avoid limp mode and see how that goes
have you blocked the EGR?

Yep that's all done. Beginning to think now I may have a leak somewhere. Can't seem to get boost back over 15 psi. Will have to investigate. Intercooler was recently replaced btw.


Sent from my HTC_0PJA10 using Tapatalk

[threedogs]

Yep that's all done. Beginning to think now I may have a leak somewhere. Can't seem to get boost back over 15 psi. Will have to investigate. Intercooler was recently replaced btw.


Sent from my HTC_0PJA10 using Tapatalk

I take it you replaced it with a fully tigged and tested unit?
Check/or replace your vacuum hoses maybe they are perished
and leaking,

[Snow Patrol]

I take it you replaced it with a fully tigged and tested unit?
Check/or replace your vacuum hoses maybe they are perished
and leaking,

Checked all the hoses all good. Nipped up the turbo hose clamps as well. Some were a tiny bit slack. Anyway the news is good. Pressure is back up about 18 psi. Could have been a very small pressure leak coupled with some very hot days keeping the pressure down. Good now though.

Sent from my HTC_0PJA10 using Tapatalk

[threedogs]

Checked all the hoses all good. Nipped up the turbo hose clamps as well. Some were a tiny bit slack. Anyway the news is good. Pressure is back up about 18 psi. Could have been a very small pressure leak coupled with some very hot days keeping the pressure down. Good now though.

Sent from my HTC_0PJA10 using Tapatalk

If your IC is oily chances are its leaking, you could test it but really they all leak
very early in their life

[Snow Patrol]

If your IC is oily chances are its leaking, you could test it but really they all leak
very early in their life

Its a tigged one. I replaced it about 10K ago. But it was leaking.

Sent from my HTC_0PJA10 using Tapatalk