Ba Mkii Xr6 Turbo - Down On Power

[rapid6turbo]

Hi All,

Having some issues with my 2005 BA Mkii xr6 turbo.

Mod on the vehicle before I bought it:

crow HD valve springs

ngk plugs gapped to .75

upgraded intercooler

walbro intank pump

2nd cai mod

k&n panel filter

3" advanaded divorced dump pipe

3" advanced cat (not sure on cpsi)

36psi (Expensive Daewoo v6) injectors @ 4 bar is about 38psi

HP tuners tune for 12psi

So took it to local dyno shop, I live 250km from where it was tuned originally (made 270rwkw 2 years ago)

Now making 205rwkw on 12-13psi??? what the

They had trouble connecting to the ECU and got stuffed around there for a few weeks. Then was going to the airport and passed the original tuner on the way, he diagnosed it as faulty, boost solenoid, wastegate actuator, or waste gate flapper. They checked over tune and said it looks fine. Took for a test drive and was making boost then loosing it quickly so I thought the diagnosis to be fairly accurate.

So went and replaced solenoid, still the same. Next ordered billett 12psi actuator, and while the turbo was off thought may aswell port the wategate out.

Put it all back togther and it kinda better, but still way down on power. can not even spin up the wheels with traction control turned off. tested for boost leaks, replaced clamps and still the same.

So why has it lost approx 70rwkw????

Any help is appreciated. Hope I havent missed any detail

[matt036]

This is a bit of a long shot but how long were the valve springs in the car before u bought it? Reason I ask is mine has a set of crow hd valve springs and last time I got it tuned we knew they were on there way out but held ok once we changed to e85. Although I noticed after a few weeks it just got doughier. I took it back to the tuner and wala down 60kw. This is just my case and maybe different to yours but its worth checkin it out as mine is doughy as fark comin on boost now and wont hold power over about 4500rpm.

Also my valve springs werent quite 2 years old before they gave up the ghost.

Edited 01/09/13 11:43 AM by matt036

[rapid6turbo]

Ok, sounds interesting. Valve springs were fitted Jan 2011. I bought the car 6 months ago, so has always felt that way.

Mine seems doughy aswell, can't even stall it up to spin the wheels, doesnt chirp 1st, 2nd shift.

Surley valve springs would last longer than that??

This is a bit of a long shot but how long were the valve springs in the car before u bought it? Reason I ask is mine has a set of crow hd valve springs and last time I got it tuned we knew they were on there way out but held ok once we changed to e85. Although I noticed after a few weeks it just got doughier. I took it back to the tuner and wala down 60kw. This is just my case and maybe different to yours but its worth checkin it out as mine is doughy as fark comin on boost now and wont hold power over about 4500rpm.

Also my valve springs werent quite 2 years old before they gave up the ghost.

[_Velocity_]

Valve springs, blocked cat, boost leak, could be anything.

Best to take it to a reputable shop and have it diagnosed properly before throwing anymore money at it.

Also did you get a retune for the car after porting the wastegate and changing actuators?

Is it breaking down at all through the powerband like traction control is kicking in or does it feel like its simply lost power?

Edited 01/09/13 12:20 PM by _Velocity_

[rapid6turbo]

I called the original tuner and he said check for blocked / collapsed exhaust etc. So put it over the pit, took the exhaust system off and ran straight out the dump pipe, no cat attached. although very loud still way down on power.

Yeah, think I'll have to travel some distance to get it sorted. No retune for wastgate mod or actuator, is that really required? Traction control never kicks in.

I still get good fuel economy though

Cheers

Valve springs, blocked cat, boost leak, could be anything. Best to take it to a reputable shop and have it diagnosed properly before throwing anymore money at it. Also did you get a retune for the car after porting the wastegate and changing actuators? Is it breaking down at all through the powerband like traction control is kicking in or does it feel like its simply lost power?

[rapid6turbo]

Visually the cat looked fine, dunno how to test its flow??

[matt036]

Surley valve springs would last longer than that??

Mine were installed by a reputable tuner in August 2011 and yeah there shagged. I ol mate said best bet would be getting it to a reputable tuner. I have to drive at least 6 hours to get to one but it's worth it.

[rapid6turbo]

Are valve springs really that bad?? 2 year life span. It just doesnt sound right.

[bloosted]

I called the original tuner and he said check for blocked / collapsed exhaust etc. So put it over the pit, took the exhaust system off and ran straight out the dump pipe, no cat attached. although very loud still way down on power.

Yeah, think I'll have to travel some distance to get it sorted. No retune for wastgate mod or actuator, is that really required? Traction control never kicks in.

I still get good fuel economy though

Cheers

get it retuned with the new actuator before you hit boost again unless you want a new motor

[rapid6turbo]

Not wanting to sound silly, but it was running 12 psi with the old actuator & boost is controlled electronically. Putting on a 12 psi actuator to me would be the same. Am I wrong?