Jump to content
SAU Community

Recommended Posts

  • Replies 45
  • Created
  • Last Reply

Top Posters In This Topic

I had a turbo blow on a GTR.

Never compression tested before the turbo blew, but after it blew it started having severe blow by.

Compression tested less than 125psi on three cylinders that corresponded to that turbo and 140psi on the three that didn't.

I assumed it was related but can't back that up.

Have always been scared of blowing turbos since, yet have been informed by many people running single turbo's who have blown turbos they had no dramas.

Compression test for starters, will help answer your question.

I had a turbo blow on a GTR.

Never compression tested before the turbo blew, but after it blew it started having severe blow by.

Compression tested less than 125psi on three cylinders that corresponded to that turbo and 140psi on the three that didn't.

I assumed it was related but can't back that up.

Have always been scared of blowing turbos since, yet have been informed by many people running single turbo's who have blown turbos they had no dramas.

Compression test for starters, will help answer your question.

Yep.. I have posted on here a few times about this type of thing.

Some don't believe it, but I have seen it happen enough times to know it does.

Only with Ceramic turbos.. and no idea what causes the dust to suck back into the engine. Causes some nice damage though and only to the 3 cyl that the turbo was on. I'm talking large gouges in the bore.

I was always careful with my GTR's with stock turbos after seeing this.

dude I'd be leaving the car off!!!!

And pulling off the head to check for damage maybe a compression test would be a good idea. before taking off the head.. :)

Have you looked at the turbo?

My car made a bang and ran like poo it was just blowing smoke and run like a pig above like 2000rpms tuned out to be a intercooler pipe came lose.. made heaps of noise!!!

Hope all ends up well...

Hey guys, got it fixed today, got a new high flowed gcg turbo. The wheel was shattered, they took it out from the middle thinggy in the exhaust.

i went from a 276 hp to 311 hp, 206kw to 232.2kw

I am very happy, the car is really powerful

All thats left is the exhaust all the way through and the injectors

Edited by the_game

just throwing ideas out there:

- 20psi of exhaust back pressure at full boost in your GTR (guesstimate)

- exhaust wheel dies, jams against turbine housing

- exhaust back pressure spikes horribly because total exhaust flow from those 3 cylinders just took a huge dive

- big back pressure = big ping, massively hot exhaust residuals left in combustion chamber on next compression stroke causes pre-ignition

- 3 cylinders get blowby, ring damage etc

i can't really think of another reason that the rings and pistons would be damaged if a turbo let go in a GTR. it would be very improbable that ceramic dust/chips/fragments would somehow make their way back into the combustion chamber through the exhaust runners and valves. especially for it to happen equally on all 3 cylinders.

just throwing ideas out there:

- 20psi of exhaust back pressure at full boost in your GTR (guesstimate)

- exhaust wheel dies, jams against turbine housing

- exhaust back pressure spikes horribly because total exhaust flow from those 3 cylinders just took a huge dive

- big back pressure = big ping, massively hot exhaust residuals left in combustion chamber on next compression stroke causes pre-ignition

- 3 cylinders get blowby, ring damage etc

i can't really think of another reason that the rings and pistons would be damaged if a turbo let go in a GTR. it would be very improbable that ceramic dust/chips/fragments would somehow make their way back into the combustion chamber through the exhaust runners and valves. especially for it to happen equally on all 3 cylinders.

I have to disagree. That engineer can say what he likes, however you still have either an internal or external wastegate which limits the exhaust manifold pressure. Although this pressure would be higher than previous.

You can still get cermaic wheel pieces or dust swept back into the cylinder. Especially during valve overlap when your exhaust manifold pressures are much higher than your intake (increased if your turbo is broken: greater pressure differential).

While your engineer is correct that increases in EMAP will increase residuals during the next cycle, its unlikely due to the fact your wastegate would still relieve the EMAP close to normal operation and the compensation by your ECU is still most likely within its limits assuming your lambda sensor is in and working for feedback control. :laugh:

I can think of plenty of other reasons why a turbocharger would damage your engine. Mechanical contact from compressor pieces. Hydraulic compression of fuel from running too rich and incomplete combustion outside of ecu compensation (which is limited)....

Edited by AndrewD

At the risk of sounding simple...

The question was:

- 'resulted in a blown engine'.

He did say from stuff going inside the engine, but I'll take one step back from that and say, who knows exactly why

- BUT

The answer from experience seems to be, and I'm sure others will back me up:

- On GTR's that have blown stock turbos, it is quite common to have failure on the three corresponding cylinders.

I never looked too much into why, so at the same time, it may only be the case for twin turbo's... could that be a possibility?

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



  • Similar Content

  • Latest Posts

    • My experience with Rising Sun Exports Before agreeing to the sale I tried to do as much research as I could (obviously), his Facebook reviews are 98% and he goes Live at least once or twice a week. I contacted 2 people in the UK who had used him for their imports, both had positive feedback. His explanation and talk through of the import process was thorough, answering any query no matter how stupid it was. It felt as soon as the money was sent, communication dropped off. I asked for shipping updates every 2 weeks or so, not wanting to pester him, he never had any updates. I wasn't informed the car had been dropped off at the port, I only found out by his Facebook story. I asked for the photos taken at the port, knowing he would need some for insurance purposes. I received a few 5 second clips and that's it. When asked again, he said his staff had them. Weeks later I asked again, he tells me he doesn't have any, but does have 50 photos from the original advert. I never received them. I eventually got the documents sent via WhatsApp after I mentioned the port was requesting them. I purchased a CarVX report, to find out the vehicle is a Grade R with recorded accident damage, first recorded in 2017 when it was first auctioned. He never told me the grade, then again I didn't ask. His response was "Grade R means nothing, it wasn't chassis damage". Still, I would have liked to have been informed about it. Jon prides himself on being open and honest when it comes to inspecting cars, it's his main job doing so at the auctions for customers. When the vehicle arrived in the UK I noticed a few little cosmetic issues. It's a 21 year old car so it wasn't going to be mint condition. The side skirts are cracked on each corner and the sealant is failing. The front grill on the bonnet/hood isn't secured very well, mounting studs are missing. Both minor things, but again, it would have been nice to be told. During a Facebook Live walk around video of the vehicle, he mentioned it has a front Whiteline anti roll bar/sway bar. While on the inspection ramp, I noticed the stock item has been installed. When first questioned, his response was "the ARB? Switched? Since when, it never had them". Since sending video and photo evidence I've not received a response. I'm probably being over critical of the overall condition of an old car, but all I wanted was honesty (which he claims to have). I'm aware I wasn't his only customer, he's busy doing XYZ but other reviews praise him for great communication with regular updates and photos, I felt I didn't receive the same treatment. 
    • I was able to get some underside photos while the car was on the ramp The suspension is all Altezza/IS200/IS300 so getting part's will hopefully be less of a headache
    • Welcome to my 2004 Toyota Mark ii IR-V Fortuna (series 2) With a 1JZ-GTE powerplant under the bonnet (hood) it'll give me plenty of scope for power upgrades. For those who aren't familiar with imports, the 1JZ-GTE is a 2.5L 6 cylinder VVTi engine with a single turbocharger. This has the factory R154 5 speed gearbox, along with a aftermarket 2 way LSD differential (brand unknown). Under the arches are a set of CST Zero 1 alloys, 18x9 +30 225/40 up front and 18x9.5 +15 265/35 on the rear. The car was quite low in Japan and there's evidence of the wheels catching the rolled arches/fenders. The tyre's aren't great so I'm in two minds whether to replace both or just the tyres and put up with the wider wheels on the rear. The car still uses stock brakes with the addition of some braided hoses. The exterior is stock with the exception of a BN Sports front bumper and a replacement Fortuna grill  Moving to the interior, the steering wheel has been replaced with a dished MOMO steering wheel (which will get swapped for my Momo Tuner for the time being) Defi Link Gauges are mounted above the climate controls and on the A pillar, the Oil Temp,Oil Pressure,Water Temp and Boost gauges should help with spirited and track driving  The stock seats have been replaced with some retrimmed Recaro bucket seats. Being a larger build these are a little snug, unfortunately the orange isn't for me so I'll look into replacing these down the line. Other modifications include a twin plate clutch, Blitz intercooler, Evolve alloy radiator, a stainless exhaust with decat, HKS EVC-S boost controller and coil overs
    • Apologies for the long read My R34 GTT was up for sale at the beginning of spring due to a few repairs creeping up. The strut tops needed replacing, roof and bonnet (hood) painting (yay for 3 stage pearl) and the underside stripped and treated. I sold the car which allowed me to be in a much better place financially. Leading up to the sale I was already thinking about the replacement. In an ideal world it needed to be a good all-rounder. Something I can mess around with, modify, do track days, do the school run, go on long drives etc.  Options included but not limited to... Laurel C35, Evo 8/9, Civic FD2, Impreza Hawkeye, Aristo and even an Audi S4 Avant (I've already got the Mazda 6 wagon). But there was always one car at the top of the list The Toyota Mark ii JZX110 I found an advert on a Facebook group for an example in Japan, from a seller called Jon at Rising Sun Exports. A few messages back and forth and Jon calls me from Yokohama one morning (or afternoon in his case). He briefly explained the import process, the costs involved and a repeat of the advert. After much deliberation, the price was agreed and the sale was locked in. I've never imported a vehicle so I jumped into the unknown head first. The money transfer was completed through wise.com (fees apply), very easy to use and the money was with him within a day or two.  The car suspension was raised for the vessel and the car dropped off at the port. It was 7 weeks later when the bill of lading was received and the freight invoice sent to me, followed by the export certificate a couple of days after (both digital copies) In the mean time the port had been in contact. I needed an agent to deal with the NOVA (notification of vehicle arrival) along with the tax/duty invoice, this was £75.00. The port also had a fee of £100, I'm guessing to cover the cost of the 10 day 'free storage' and for moving the car off the boat etc. They need a copy of the vehicle invoice, freight invoice and export certificate to allow the vehicle to pass through customs. The vessel arrived on Tuesday 5th August, the tax/duty invoice was generated and sent over. This is generally tax 20% and duty 10% of the vehicle value. Although the invoice came in at a higher amount than I had calculated. Once HMRC had received the payment the vehicle could be released from customs. I thought once the tax/duty was paid you could collect at any point, that's not the case. Your agent will need to book a collection slot, I requested Thursday 7th which was accepted, with a 9:00am slot allocated. It was a 5:00am start from Norfolk heading to Southampton. We eventually found the compound, upon presenting the bill of lading and some ID they released the car (they drove it out of the compound to the front ready for us to load up). The email from the port stated each slot had a 10 minute window, which seemed abit farfetched but the staff said it's not a strict rule. We were there for approx. 30-40 mins in total. A week prior to collecting I contacted my garage and explained the situation, I was able to get an inspection slot that afternoon. For the registration, DVLA require the car to be insured, for this I used a company called Adrian Flux who can insure the vehicle using the VIN number. 
    • Hey guys, looking for these side skirts if anyone can help me out. 
×
×
  • Create New...