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Old 14-03-19, 09:31 AM   #375
p_b82
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Quote:
Originally Posted by gAZ View Post
Quick question. When should I expect the turbo to be making max boost pressure?

If I was testing in 3rd gear for example?

Is there a recommended procedure for testing boost pressure?

I'm trying to adjust the actuator to 19psi but the readings from the torque app seem inconsistent. 17.9psi, 18.5 psi , 19.5 psi sometimes hitting 20 psi
A standard turbo will start to spool at about 1500 rpm, and should be hitting full boost by about 1800 rpm if my memory is correct (I've not had one fitted for many many years).

I found the best method was to stick in as high a gear as I could on as straight a piece of tarmac and just floor it for as long as you can, allowing the car to come on boost in the process. eg start with the car off boost and let it wind up, this avoids any spiking.

Using a higher gear will give you longer to get a more consistent reading as well - but has issues around top speed achievable if it is on the road.

It's ok to have a little spike of overboost if you just jam your foot on the throttle while on boost, but it should settle down quickly.

I don't know if the app you're using takes into consideration Ambient air pressure, but a half a PSI here and there is nothing to worry about on the diesel, and there are some out there now that think running over 20PSI is fine for the turbo too, so as long as it stays below 20 for the most time you should be ok.
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