Saturday, January 07, 2006 - 10:42 pm, by: Shane McInnes(Soarin_tt)
Hey,
Ok last weekend i got a drop in Boost to 5psi from 12psi then it went to 0psi...Took it to the mechanics and we both thought it was the turbos blown because we started hearing a squealing noise.
Through the week i wanted to make sure it was defientley the turbos so i disconnected the exhaust infront of the cat and i regained 10psi.
So today i bought a new Cat and now im getting 10psi still...I should be getting 12psi does anyone have any ideas why the PSI has dropped? ive checked all the intercooler piping and its all tight, The new Cat isnt causing the 2psi drop ethier because as i said i had the exhaust of infront of the cat and still got 10psi.
So any suggestions on what to look for would be great, i know its only 2psi loss. But i would really like to know why its happening, it does tend to drop off it abit aswell at High RPM. Could worn Turbos be the cause aswell? we did get a loud squealing noise last week but is gone now.
Saturday, January 07, 2006 - 11:21 pm, by: Cihan Aday(Cihan)
Did you check if there was anything lodged in the CAT? Could have been an exhaust wheel, but i guess you would have seen it stuck there when it was removed.
Sunday, January 08, 2006 - 12:07 am, by: Shane McInnes(Soarin_tt)
Nope the old cat was buggared, it had broken inside and crumbled to bits when touched (although only looked at it for 20seconds if that, and if there was a exhaust wheel that flew off, i shouldnt be getting 10psi should i?)...But as i said i had the exhaust disconnected at the front and still got 10psi.
Also i have no boost controller. Just Natural Boost.
Sunday, January 08, 2006 - 10:31 am, by: Cihan Aday(Cihan)
3 cylinders are still flowing to one of the turbo's and its entirely possible for it to make boost. It also makes sense that it would drop off as revs went up, the stalled compressor could be causing a restriction.
Sunday, January 08, 2006 - 10:46 am, by: Shane McInnes(Soarin_tt)
wouldnt i be getting white smoke aswell?
and alot less power? Power feels alright to me. I cant feel 2 much of a difference between 10 and 12psi. If it was just one turbo making 10psi shorely i would feel a lot less power?
Im saving for my turbos to be steel wheeled and hi flowed . So ill guess ill take it easy till then.
whats the chances of a split in one of the turbo hoses causing it to leak and drop in boost? Or a leak in the BOV...My BOV was siezed yesterday my mechanic took it of and spayed it with wd40 to get it working again. Do you think the BOV could have something to do with it?
Sunday, January 08, 2006 - 11:57 am, by: Cihan Aday(Cihan)
Lets not jump the gun and assume its the turbo's yet. If it was a leak in turbo associated hosing, it would cause overboosting. The only leak that would reduce the torque you feel when you gas it would be BOV or intercooler associated. You said it drops off as you rev it, if it was pressure related you would hear boost leaking. (its loud!)
If the bonded ceramic exhaust wheel flew off the shaft, there wouldnt be any blue smoke. Whether one turbo makes 10psi at the intake, or 2 turbo's make 10psi at the intake.. the torque produced would be the same/similar, just laggy'er. Having one of the stock turbos make 10psi would introduce more heat to the system, the lone turbo would be passed its compressor efficiency range and power would drop off as revs rose.
Can you see what i mean? -whining noise, whining stops -broken, crumbled CAT converter with bits -drop CAT, 10psi, replace CAT, 10psi -torque falling off at high revs -but midrange torque feels similar
I have no doubt i could be wrong, these things are trivial without having a pro check it out. Any suggestions guys?
Sunday, January 08, 2006 - 02:17 pm, by: Craig Webber(Soarr)
I'LL go way out on a lim and say maybe it's as simple thing as a block air filter. I had some lose of grunt,cleaned the air filter and back to full grunt.It may not help but that one less thing to check.
Sunday, January 08, 2006 - 06:34 pm, by: Shane McInnes(Soarin_tt)
It drives as hard as it did Simon (i think, but i am not 100% sure). but im not really gonna notice 2psi difference, especially when i was driving my dads old falcon for a week. You could be right Simon about a leak or out of whack boost gauge, But bit of coincidence really if it was.
Graig i cleaned the Pod Filter at my mechanics using the air blower, i didnt use the K&N air filter cleaner product. but perhaps ill try that at work tomorrow. cause thats where i keep my Air Filter Cleaner.
Monday, January 09, 2006 - 09:43 pm, by: Craig Webber(Soarr)
Shane never clean an oil type filter with an air gun it can fucck them right up.just give it a good clean with the right stuff.And see how you go.Go luck Hope it turns out to be some thing simple as the air filter.
Tuesday, January 10, 2006 - 06:43 pm, by: Shane McInnes(Soarin_tt)
Cheers Graig, i cleaned the air filter yesterday with the K&N air filter cleaner kit, and still the same problem. I might buy a new Air Filter soon anyway and see what happens.
I must say though my Fuel Economy is going great with the new Cat, alot better than it was a couple wks back.
Wednesday, January 11, 2006 - 08:36 pm, by: Shane McInnes(Soarin_tt)
I have a After Market BOV (Turbo Smart Type II) and the car was sitting at my house for around 5days thinking it was the turbos blown, untill i checked the cat, and when i drove it, i noticed the BOV wasnt working, when i replaced the Cat the BOV still wasnt working, it was Siezed and i got it removed and sprayed WD-40 to get it unsiezed, put it back on and it was working again....So in the back of my mind i think its BOV related, but i dunno how to test if its leaking or working properly??? is there any way to tell its leaking at 9 to 10psi???
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