So guys, been ages since I came on here, moved house ect lol

 

Anyway, a lot of you will remember my car having limp issues and me not being able to use anything past partial throttle..

Well I figured it out finally.

 

Turns out, the forge actuator that came with the last turbo had red spring fitted. Strongest one forge do!! So to strong for my setup.

Upon removal and strip down I found red spring, which means obv the actuator wasn't opening the wastegate, car was overboosting (badly, car mapped for 20 and it was  spiking at 28-30 :-o ), ecu was seeing this and hitting limp mode. But I found if I wound on 15psi of boost she would go quite well.. (that explains the partial throttle issue I posted about)

 

So I fitted a known good standard actuator, wound her on 3 turns of preload and the car has never been better. She spikes 20, tails off to around 18 and holds. 

 

So a long winded post in case anyone experiences similar issues

 

Cheers 

Edited 4 July, 201411 yr by LuckyvRS20vT

Nice one. Thanks for posting this advice, and well done for getting it sorted.

 

I bet you're feeling well happy when you drive her now! I hate it when there's an issue with a car that is difficult to trace. Makes me not want to enjoy driving anymore!

It made me want to drive it somewhere quiet, squirt lighter fluid in and throw a match if I'm honest mate lol

Well done mate!

Did you get a light on when the ECU detected the massive boost spike or did it just let boost get dumped?

And did you use VCDS to log the spikes? As I thought the standard MAP sensor could only see 2.5-ish bar including atmospheric pressure?

No eml came on.. it just spiked high and went straight into limp mode. 

As I say, if I fed on 15psi it was fine. But that was  a hard thing to do in a traffic light gp, trying to tell yourself to only press the pedal so much when you first instinct is to floor it.

 

Weird problem but now sorted that. 

 

You say standard map sensor detects 2.5 bar? 2 bar is 28.4psi.... 

That all makes perfect sense now about not mashing the pedal to the floor. I am currently in a similar situation with a stiffer than normal actuator and a map that can't manage it. But a trip to R-tech is just round the corner.

The MAP sensor read atmospheric pressure, so a bar if boost gives a reading of roughly 2 bar via VCDS. I guess thus is irrelevant if you have some other means if measuring boost though!

No, boost gauge was showing me 28-30  

 

Not since the actuator swap though thank God 

delighted you finally sorted that out!

 

my vrs is still going into limp mode and chokes and what not, but going in to mate that's a vag and scooby specialist and he's gonna look into it for me and got a new actuator so hopefully that'll sort it out for me

 

cheers for the advice mate, will post if my car is sorted