Low Boost Even After Flash Tuner.... Is Its Actuator?

[ravenhard]

Well I got a CAPA flash tuner the other day, while I was at the shop I got my car on the dyno to see the results. Stock I got 195rwkw and with the 10psi tune I got 205.2rwkw. Obviously not what I was expecting.

On the stock run the tuner mentioned the boost was coming on slow and late. After we changed to the 10psi tune it was still doing the same thing. Boost never got over 5psi.

Now never owning a T before I thought that was how they performed and never realised my car was under performing. heck I still got 195rwkw.

So the question is , is this a problem with the stock actuator, the fact the boost comes on slow and Im not able to get above 5psi even on a 10psi generic tune? Does the dyno readout indicate this?

Now let me just clarify that the tuner is well respected and I do feel they know there stuff and that I dont have any reason to doubt their word, but I do like to get second opinions before I go a fork out over $500 to replace the stock actuator.

If I do get another actuator, can I just get it and get my local mechanic mate to install it? Would it need to get a retune even though its a generic tune? And also what do I get 8 , 10 or 12lb. I dont ever plan on getting more that 300rwkw and if I do it wont be for a long while.

heres the print out

[Guest]

Check for boost leaks first mate

[ETM]

I have bench tested 4 actuators and they all start to open at 0 psi.

they are terrible for achieving boost fast as you are wasting so much exhaust gas that could be used to spin the turbo up.

other than that try lubricating the boost solenoid as per another thread on the forums that you can find easily by searching,

also investigate if the cat,or a muffler is blocked

[ravenhard]

well I installed the typhoon CAI and did the boost solenoid maintence thing last weekend. Could it be I farked up the solenoid by sparying too much wd40 in it? Pretty sure everything was tighten, even re-tightened alot of the pipes I didnt affect as I was waiting 30mins after spraying the solenoid so had time to kill. But may as well go have a look, couldnt hurt I suppose

[Muzza]

I have bench tested 4 actuators and they all start to open at 0 psi.

they are terrible for achieving boost fast as you are wasting so much exhaust gas that could be used to spin the turbo up.

other than that try lubricating the boost solenoid as per another thread on the forums that you can find easily by searching,

also investigate if the cat,or a muffler is blocked

All good advice. Alot of blocked cats around the 80,000km mark. Also invest in a custom tune for best results.

Muzza.

[JTXR6T]

before you do anything else, check for boost leaks, I usually pull the crossover off and reset all the seals making sure that no hoses are broken etc. So far every single time my car has been down on power its been a boost leak... Might have to invest in a plazmaman or the like kit soon, getting over it lol

[XR6 Turbo Developments]

Could be the waistgate flap jammed. Heve seen valve springs cause a similar issue before as well.

Edited 20/04/08 11:51 AM by XR6 Turbo Developments

[LUMO]

my T made 206.5 stock, then had bta fix my afrs and boosted it to 9 psi and the car has 226.5 rwkws with no problem and I have a 2002 ba xr6t.. I doubt its the valve srings....

[XR6 Turbo Developments]

my T made 206.5 stock, then had bta fix my afrs and boosted it to 9 psi and the car has 226.5 rwkws with no problem and I have a 2002 ba xr6t.. I doubt its the valve srings....

OKAY!

Edited 20/04/08 11:20 AM by XR6 Turbo Developments

[Ralph Wiggum]

When you did the boost solenoid lube job did you install the hoses back onto the solenoid correctly? if you install the hoses about the actuator doesnt seen any boost pressure so it bleeds open very early.