possible boost holding problem

[Guest]

hi folks,

 

our classic wrx is having a wee problem, tried to resolve before. well driving normally it will hold 0.9 bar boost in all gears BUT when you nail the car it goes to 0.9 bar --- then has a big backfire, seens as though the anchors go on, boost drops to 0.6 bar.

the coil packs, plugs, oil levels are okay, car running on shell V.

does anyone - grant, et all have a clue why its doing it .......... a bit hacked off.

 

thanks

[scoobaroo]

Have you checked all the hoses ?? could be drawing air ,  just a suggestion m8 .

[johnnyr6]

After the backfire and drop to 0.6 bar does it go back up to 0.9? How is the MAF?

[the squiggle]

As said before check the hoses between the turbo and manifold as well

MAF is also a suspect, so give it a clean with Brake Cleaner

Check the pipes around the boost solenoid

[Guest]

hi folks,

 

thanks for the replies, net access is limited at the min.

J6R - the boost does return to 0.9 bar.

When i first got the car - 2 years ago it had a new maf (courtisy of the squirrel) - and even at that point it was doing the same, thats when the coil packs were changed. at that time it has an hks induction kit on it. i sold the catr to pedals who swithched the induction kit to a std filter. since getting the car back it still had the 'backfire' problem.

i will check all connections etc when i get a chance, if all ok what else could it be?

 

thanks again folks.

[Guest]

looks like it could be similar to what pedals found on the car, one hose loose, will check it out.

 

keep you posted.

[Guest]

well all pipes are on okay, maf looks ok ..... so where now.

is it a new fuel pump? or is it a case on not nailing it and puting the power in smooth, until i can get plan b done (apexi)