Jump to content
SAU Community

Potential Damage With Blown Turbos

RB26TTVL

By RB26TTVL,
in Engines & Forced Induction

 Share

Recommended Posts

MANWHORE Grand Master

MANWHORE

Posted
Posted

Initially I didn't believe it myself, but I've read so much about it on sau as well as from various sources (I got really interested in it - self interest project).

The main argument presented against it happening is that the ceramic is merely dust and it has to combat high velocity gas to go backwards.

The thing is though, some of the particles are actually quite significantly bigger than dust. If you have a look at wrxhoon's pistons, you'd need some pretty big dust to do that.

Also, think about this this way. The particles are moving with a lot of momentum. Imagine if you shot a gun into the wind. It would still go against the wind even though the wind is strong. Think of the relative difference.

Beer Baron Grand Master

Beer Baron

Posted
Posted

manifold design on the 25 is very different. all 6 cylinders into a comon collecter, plus longer runners. so I've never heard of it on a 25.

plus what's an exhaust wheel spinning at on boost? 100,000rpm? 120,000? must be well up there. when it finally does break up it will be fairly hauling in almost every possible direction.

neshgtr Community Regular

neshgtr

Posted
Posted

just a quick question.. i did my exhaust wheel in rear turbo which ended up in the cat.. turbo has since been replaced however i havent done a leakdown/compression test.. how much would this cost and does all workshops do it? im in melb

hanyou Grand Master

hanyou

Posted
Posted

neshgtr: im in same position as you, however my turbos are being fitted today.

is there any sign to know the engine has been damaged other then comrpession/leakdown. such as unstable idle or weird knocking noises etc?. because after mine blew and i turned it on everything seemed to be fine. other then the obvious turbo not working lol. although i can hear the peices in my cat

MANWHORE Grand Master

MANWHORE

Posted
Posted (edited)

The way I see it, there are differing degrees of stuffed-up-ed-ness.

I have seen compression test results where the rear cylinders are all slightly down compared to the front. I suppose that woudl mean that a slight amount of wheel went back into the engine.

There are also the really bad ones where compression is like 50psi (like wrxhoon's).

If it's only mild, you probably won't feel anything?

Why wouldn't you just get a compression/leakdown test?

It's just like going to the doctor - I think my arm is broken, but I don't want an xray. Will antibiotics work?

From what I've read, it seems that in about 1/3-1/2 of the times that rb26 turbos blow, the engine is gone. Then again, if the engine was not gone, people probably won't post about it.

PS: hanyou, about you selling your oil cooler after your turbos blew, I thought that was pretty irresponsible. When I asked if your turbos had blown, you briefly said that you do not believe in the whole wheel going back through the engine occurence. I hope you notified the buyer of it.

Edited by MANWHORE
wrxhoon Grand Master

wrxhoon

Posted
Posted
is there any sign to know the engine has been damaged other then comrpession/leakdown. such as unstable idle or weird knocking noises etc?.

Blow-by.

Don't forget you could have very little bore marking ( from very fine dust) and still have perfect compression because the oil blocks it however a leakdown test will show it.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      R32 Gtst - Track Car

      By MBS206 · Posted

      Biggest thing is you're okay!   It sounds like between the accident, and the drive home, it was a pretty torturous trip again! On the bright side, you took the opportunity to enjoy the event more from the perspective of a spectator, than as an entrant!   Sad to see so much damage to the car. It really has taken a HUGE hit in the front end. If/when you choose to repair, hopefully the rails are straight (At least from shock tower backwards). Hopefully the extra cage coming through there has save most of the chassis rails, and HOPEFULLY saved the motor too. Best of luck when you eventually get motivated to start pulling it down to check it all out
    • MBS206
      Slight brake pedal stutter after new pads

      By MBS206 · Posted

      Sounds more like what Brad said, that it's mainly transfer. What pad bed in procedure did you use, and did you replace/machine the rotors, or just swap pads?
    • PranK
      Slight brake pedal stutter after new pads

      By PranK · Posted

      The stutter is almost entirely in the pedal. I don't feel the brakes release and reapply as you would with ABS engaging but the pedal feels that way, without the brakes releasing. It only lasts for less than a second and the pedal is fine again. It's hard to explain, sorry.  I'll get under this weekend and just double check everything is tight. Fluid is at max where I left it.
    • MBS206
      Slight brake pedal stutter after new pads

      By MBS206 · Posted

      What bedding in procedure did you use?   When you say stutter, what exactly do you mean? Like it feels like someone letting go of the brakes momentarily and regrabbing them again to get you to stop? Re-reading your post, and that is what it kind of makes me think you're explaining, like theres a little bit of a jolt, likely just as you're reaching a stop. I've only had this issue once. And if its caused by what caused mine, you will want to get the car up on stands again and check it over. Mine was a case of a caliper mounting bolt coming out and letting the caliper rotate on the other remaining bolt and gave play in a wheel as it came to a stop. But not every stop either!
    • bcozican
      R32 Gtst - Track Car

      By bcozican · Posted

      Yeop... binned it   This will be a summary will not many pics atm and cbf  Fixed the samsonas - it was totally munched Put a new precision 7675 T4 on with proper split pulse mani Got to Sydney to get to car - drove to canberra to get racecar - drive back to sydney that night Next day all day at Plasmaman putting on new clamps cleaning some things up and adding another large engine oil cooler sitting at the rear above diffuser to keep things cooler Next day - Tuesday - on Dyno - killer wikid awesome pumped out really good numbers - more mid range and on lower boost levels Wednesday - first prac - all day again getting the suspension right - had to borrow front suspension again - out do a lap come in - out do a lap - in - what i had just couldnt handle the load at the more consistent higher speeds - got a lap in at the end of the day that was pretty reasonable  Put it this way that lap wouldve had me in 4th in Pro am for the whole event - with only 700 hp and used tyres Thurs first official prac day - lap out warm up - then entered a hotlap with above setting and 80% effort took corners 1,2,3 and into 4 car felt awesome -  rear came around out of nowhere bang into the wall near front on at whatever 140 kmph Done, over, gone Just one of those how did that happen apparently as all indications show nothing out of the ordinary Got to spend the rest of the time at the event like I hadnt done before - was actually Ok mainly as I had my family and my boy is 9 and got treated like a rockstar Long trip home, lost a trailer wheel in nowhere land, X5 airbag suspension gave up half way across nullabour and rode on bumps stops (its now completely fine) had to do a 19 hr drive day on day 3 as accommodation got screwed up so just had to keep driving till found a town with some Now to reassess - hopefully the motor and other things are OK but yet to be seen too. There is no easy fix there is no i'll just order that part and get it sent - we'll have a talk to people see what can happen and what the go is but at minimum its rebuild from scratch struts forward and alot of time effort and $ should and if I return and if but maybe/ when  I have the cage tied into the front strut towers - if I didnt have that things couldnt been worse you can say its just a front end but if you know what goes into these cars... you'll know what that actually means in reality   Car was very fast. Disappointing we just didnt get to show it Effort doesnt win you races though     Apparently this is motorsport !  
×
×
  • Create New...