Volvo V70 T5 SE Boost dropping problem

[lukeous]

Hi all

Just recently installed a turbosmart boost controller set up to run 12psi which is fine in 1st and 2nd holds boost well and comes on boost nicely then in 3rd once you get to around 3500rpm it drops down to 8psi and then stays there any ideas could it be because of the standard map.

Sorry not too sure what it could be or know the ins or outs of the volvo & its my first boosted car but do understand the basics

cheers

[jdavis]

Ecu is probably detecting an air leak, your boost controller. Is engine management light on?

[lukeous]

hi no engine light pops on its like when your on full thottle for long periods of time

cheers

[M-R-P]

could be a number of things. how have you fitted the boost controller?
mine's running a bleed valve and boosting over 16 psi with no issues

[lukeous]

fitted in-between the wastegate actuator and ecu controller solenoid the reason i got the manual boost controller was to stop boost spiking wasnt sure a bleed valve would do damage but i duno (im sooo confused by it)

cheers

[M-R-P]

sounds like the controller isn't set up right.
what was it boosting to before you fitted the turbosmart?

[stribo]

Could be a weak actuator.

[lukeous]

i dont know what it was running before but can take it off and check tomorow cause it had a bleed valve before and was spiking so i went over to a manual boost controller which stoped the spiking and come on boost better and holds better until you leave 2nd then it all goes to pot lol

[M-R-P]

maybe the tcv, might be worth bypassing it. leave the electrical connection attached but put the vac pipes directly to the mbc

[lukeous]

ok cheers will give that a go tomorow and let you know

cheers man!

[lukeous]

hi again just been under the bonnet just had a look at the boost controller to see what vac i need to plug on and at the minute its on the yellow one so do i change it to the red one or the blue one all have a little colour band round them cheers

[M-R-P]

There's 3 on the tcv - the compressor pipe connected to the metal port on the tcv and the actuator pipe connected at 90 degrees both need to go to the mbc. the 3rd pipe just needs folding-over and cable-tying to stop it drawing unmetered air.

[lukeous]

sweet gonna go do it now and cheers was that third one i was unsure off (fingers crossed!)

[M-R-P]

That's what forums are for.

Just be careful to start with. Set the MBC to 10 psi to make sure it's all working before you go turning anything up.

[lukeous]

right done that seemed to be better after 3 runs up and down the road then it started again ive taken some picys to show what ive done just uploading now to photobucket

[lukeous]

if you have any ideas of what it could be or how to fix it probally the easyest way to solve it instead of having to keep coming back on dont wana be a pain in the ass

[M-R-P]

You're not being a pain, this is what forums are all about

Next step would be to check for split/loose hoses (the big ones) as prolonged boost appears to be causing a loss. If short bursts are mainly ok then I think you have a leak somewhere.

Lets have a look at the photos and see if there's anything visible.

[lukeous]

sorry about the pics misses has my phone so having to use a OLD! Camera right this is what ive done so far

[M-R-P]

That looks ok.

What are you using to measure boost levels?

[M-R-P]

Also, as Stribo said, the actuator might be weak, allowing it to creep under prolonged boost.

Do you get a high pitched ring/whistle noise when the boost starts to drop?