Thread: Td5 with altitude sickness

If you have nanocom, insertb SD card in it and record inputs fuelling from a journey and if the symptom occurs it will be visible on that or if all the sensor readings are OK it means it's fuel supply issue cos that's not covered by diagnostic

I played with the Nanocom and was able to log data to a SD card. I'd be interested in what the experts think. It looks like a MAF problem to me as the airflow drops to 0 on my uphill runs at high rpm.

From what I can see, I don't have an overboost issue.

Also, there is absolutely no oil in the wiring loom (checked at the engine and at the ECU end).

Excel spreadsheet contains some of the data.

Cheers
Joachim

Can be two things, the MAF is reading higher than the reality is or there's a slight boost leak between the turbo and inlet.... do you have any kind of tuning?

Originally Posted by sierrafery

Can be two things, the MAF is reading higher than the reality is or there's a slight boost leak between the turbo and inlet.... do you have any kind of tuning?

VGT from BAS, Alisport intercooler, ECU re-remapped by DPL. The MAF is non standard to suit the setup; it is part of the BAS kit as I understand. This setup has not been changed off lately. One of my turbo hoses cracked about two months ago. So, I replaced both with silicone hoses. I had to change the clamps to hd turbo clamps to keep them from slipping. I'll check again.

And btw: I had another (3,7) Air Flow Circuit Logged High error logged.

Cheers

that air flow high is normal cos that's what happens in the dala log too.... are you sure you are not speaking about the MAP sensor when you say "The MAF is non standard to suit the setup;"? cos that's what they used to do but beside that you need a AFR modification in the fuel map as the MAF to go up to 800+ without cutting out... according to that log when the MAF cuts out(above 650) the MAP is only 205 and that means 1.1 bar boost which is low for that high suction....it seems that your vehicle is supertuned bot not completely or as i said the MAF sensor reads higher than normal or there's a boost leak...unplug the MAF and drive it so untill you fix it

Originally Posted by sierrafery

that air flow high is normal cos that's what happens in the dala log too.... are you sure you are not speaking about the MAP sensor when you say "The MAF is non standard to suit the setup;"? cos that's what they used to do but beside that you need a AFR modification in the fuel map as the MAF to go up to 800+ without cutting out... according to that log when the MAF cuts out(above 650) the MAP is only 205 and that means 1.1 bar boost which is low for that high suction....it seems that your vehicle is supertuned bot not completely or as i said the MAF sensor reads higher than normal or there's a boost leak...unplug the MAF and drive it so untill you fix it

Don't know about the MAP, but here is my setup:


- BAS Td5 VGT hybrid and offroad turbo
- Allisport intercooler
- Td5 turbo boost box (alive??)
- modified MAF (that's what my invoice said when I got it replaced) ​
TD5 Upgraded Air Flow Meter | PERFORMANCE | Davis Performance


- cleaned out airbox to improve airflow
- 3 inch exhaust

Originally Posted by jbe

- Td5 turbo boost box (alive??)
- modified MAF (that's what my invoice said when I got it replaced) ​
TD5 Upgraded Air Flow Meter | PERFORMANCE | Davis Performance

as long as that highlighted thing is present i have nothing more to say just that FROM MY POINT OF VIEW it's a SHAME and as long as the MAF was ''uprated'' it should not have cut out at 680 but stay fit up to 850.... i hope that @Offtrack will see this to explain better

Thanks for all the responses.
I'll try baby steps now:

- check turbo hoses again and make sure they are 100% properly clamped

- another 300km round trip to get to 1000m altitude and do the following tests:

​

try to log data on nanocom

• one altitude run with problem present
  
• one altitude run without AAP connected
  
• one altitude run with pre-airbox intake plumbing removed
  
• clean AAP at altitude and try again

Happy to look into more suggestions