Is there an easy or quick way to diagnose if a turbo is failing?

its a standard TD04 on a MY00 Classic (do they have bearings or not ?)

I still cant work out the hesitation im getting as I come on boost, it sounds like the engine is retarding, or like im suddenly towing a caravan, but then it will go, it happens less when its cold and will sit at 80mph on the motorway all day long

just going on boost fails for a second or so

 

Sounds like it is dipping rich.

Are you running a Bailey's dump valve per chance ?

 

Sounds indicative of a sticky actuator to me. Probably best to whip the compressor line off the wastegate nipple and then drive it very carefully to see if you can boost and load normally. If so, it's your actuator, if not, then it something else probably turbo or inlet related.

Be careful though, you'll get infinite boost in this configuration.

@

 

Delta Dash Diagnostics show it is running a tad rich on boost, I do have another actuator in the garage that I guess I could try

I was running with a HKS VTA, but ive refitted the OEM Recirc again now, and its exactly the same

Ive had all the boostpipes off too and the intercooler and nothing seems amiss

 

Have you tried running the car on boost with the feed to the wastegate removed though? I dont mean just checking for loose pipes. Running very rich could cause it bog slightly but not as you described, a rich condition could indicate an air leak or loose pipe but you say youve checked this? I had the exact same symptoms a while back and ended up replacing the actuator with a prodrive 3 port instead.. worked much better

 

prodrive 3 port is a boost solenoid NOT an actuator.

Sonic - pm a link to a DD log of it happening

 

Dynamix

Here is a link to the thread I posted a bit back with the DD Logs (Graphs)

https://www.scoobynet.com/general-te...-all-time.html

 

Remap for the decat ?

If not - there is your problem.

 

Oh and dont bother logging Knock Correction. This is a net of det figure so even when it is showing positive it could still be detting and taking vast amounts of timing.

The timing advance table may be asking for 10 degrees of Knock Correction but the ecu is seeing det and taking out 8 degrees. With the Knock Correction being logged at 2 degrees and showing as positive.

The fact that the advance multilplier is at 10 shows that the engine is pretty miffed.

Needs a remap to control the boost and reign it in during the spool up period so that it doesnt det or fly off the end of the table.

 

[QUOTE=dynamix;8673485]prodrive 3 port is a boost solenoid NOT an actuator.

LOL, potatoes potartoes springs to mind. Yes the prodrive 3 port is a solenoid and it's a basic magnet that works on the principal of electronic actuation. But still, i'm sure the rest of the readers knew exactly what i meant, i certainly did when i fitted it

Sonic only saw your other thread this morning which give a lot more info on the situation, det retard sounds plausable in that situation, best to hook up the lappie just to be sure.

@

 

Ok - given on that point, but the turbo actuator is a completely different item

Def det going on with those KC figures you are logging and the IAM at 10.

 

The thing is it is now only boosting at about 1 bar, or just under, where previously it was boosting upto 1.1-1.2 bar

I noticed tonight whilst sat idling on the drive that there was a bit more smoke than usualy, not white or blue, but a dull grey colour and not lots of it just a bit of it lingering