The dangers of overspeeding on longer-term turbo reliability
What is overspeeding and why does it damage turbos?
Overspeeding is a term used when a turbo is operating well above its normal operating limits, and the resultant strain of overspeeding can cause untimely failure of the turbo, as well as the internal combustion engine (ICE) and associated components, Tom Wright, our product manager warns.
One of the main causes of overspeeding is insufficient airflow from the turbocharger to the engine, which could be caused by a torn air pipe, a blocked air intake or a leak between the compressor and the engine. If there are any leaks, cracks or poor seals between the compressor and the engine, the turbo will have to work much harder than it should to deliver the required air levels to the engine.
“When the engine needs more air than the turbocharger can supply, overspeeding occurs. The turbocharger then has to work outside of its usual operating limits which can, in extreme cases, cause blade damage including partial loss of blades, fatigue fractures or a burst compressor wheel,” says Wright.
A common symptom of overspeeding is the presence of the ‘orange peel’ effect on the back face of the compressor wheel. This is created by expansion and contraction.
When the compressor wheel is subjected to overspeeding, it grows in size and this expansion causes cracks between the grain boundaries of the material.
In mild cases, the component will return to its original state like elastic but in most cases these cracks begin to grow and eventually, part of the hub can break away.
Another cause of turbo overspeeding can be remapping the electronic control unit (ECU). As drivers of some performance vehicles look to maximise the fuel efficiency or performance of their cars, some turn to remapping or ‘chipped’ engine work, which involves altering the car’s ECU to deliver a different power map or torque range. This can then take the standard factory fitted turbocharger outside the operating range it was design to work within.
Wright advises when diagnosing a turbocharger fault, technicians should be wary that as a consequence of overspeeding the signs of other failure modes such as insufficient lubrication can be present. This is due to the barrier created by the oil film within the bearing systems failing. In turn, this causes contact between components as overspeeding occurs and the turbo fails.
For more information on overspeeding and the preventative measures you can take, visit our dedicated technical article: Common turbo failure – Overspeeding. You can also check out our series of educational technical videos which help identify common failures in warranty situations and provide advice on how to prevent future failures occurring,
View our Melett Turbo Tips video - How does Overspeeding cause turbocharger failure?
Melett UK will close for the Jubilee bank holiday at 17:00 on Wednesday 01 June and reopen at 08:00 on Monday 06 June. Any orders that are not picked or dispatched before we close will resume preparation when we reopen. If you would like any more information or guidance on the above, please contact our customer care team on +44 (0)1226 320939.
Memorial Day 2022
Melett North America will be closed for Memorial Day on Monday May 30th and will reopen at 8.00 am on Tuesday May 31st.
Melett Polska will be closed for a public holiday on Thursday 16th June and will reopen on Friday 17th June. Any orders that are not picked or dispatched before we close will resume preparation when we reopen. If you would like any more information or guidance on the above, please contact our customer care team on +44 (0)1226 320939.
May Bank Holiday opening hours
Will close 5.00 pm Friday 29th April and reopen 8.00 am Tuesday 3rd May
Will close 4.30 pm Friday 29th April and reopen 8.00 am Wednesday 4th May
PLEASE NOTE -THE ABILITY TO SUBMIT YOUR ORDERS THROUGH THE MELETT WEBSITE HAS BEEN RESTORED
We are delighted to advise full website functionality has now been restored, meaning you can view stock and pricing, add parts to your basket and submit your order via the website. In addition, all turbo/part number searches are fully working.
Until further notice please place your orders by 2.30 pm and we will endeavour to dispatch the same day dispatch.
We will keep you updated as we navigate through the remaining internal connectivity issues, we have dedicated teams working round the clock to resolve any remaining issues as quickly as possible.
We, at Melett, would like to stress our gratitude for your continued patience and support throughout this difficult time.
Please note you can now view your pricing on the Melett website.
We appreciate this is not a complete solution at this stage, however, please be assured our internal website and IT teams remain focused on reinstating the stock availability function.
We cannot stress enough that we are doing everything we can to reconnect our internal system, and we will restore full website functionality as soon as possible.
If you experience any problems whilst ordering online, please do not hesitate to contact:
W związku z awarią sieci telefonicznej prosimy o kontakt na telefon komórkowy: Damian 512 372 612; Kasia 511 372 612
Melett UK will be closed on Monday 29th August and will reopen at 8.00am on Tuesday 30th August.
Any orders that are not picked or dispatched before we close on Friday 26th August will resume preparation when we reopen. If you would like any more information or guidance on the above, please contact our customer care team on +44 (0)1226 320939.
Melett Polska will be closed for a public holiday on Friday 11th November and will reopen on Monday 14th November.
Any orders that are not picked or dispatched before we close on Thursday 10th November will resume preparation when we reopen. If you would like any more information or guidance on the above, please contact our customer care team on +44 (0)1226 320939.
Queen Elizabeth II state funeral - Monday 19th September
Melett UK will be closed on Monday 19th September for the state funeral of Queen Elizabeth II . Melett will be joining people and businesses across the country in reflecting on Her Majesty's incredible contribution and enduring legacy.
Melett North America and Melett Polska will remain open as normal.
Easter opening hours
Melett UK - will close 17:00 Thursday 14 April and reopen 08:00 Tuesday 19 April Melett Polska - will close 16:30 Thursday 14 April and reopen 08:00 Tuesday 19 April Due to essential maintenance, the Melett website will be temporarily unavailable on Thursday 14 April from 17:30 to 19:30. We apologise for any inconvenience caused.
В связи с техническим обслуживанием веб-сайт Melett будет временно недоступен в пятницу, 25 февраль, с 19:00 до 21:00 (CET). Приносим извинения за доставленные неудобства.
Planned maintenance – Thursday 24 March 2022
We will be undertaking planned maintenance on our internal systems this evening between 17:00 and 20:00 GMT, which will affect some website functionality.
We aim to keep disruption to a minimum and the website will remain online. However, we will need to temporarily disable online ordering during this time.
Thank you for your understanding.
We are undertaking essential maintenance this weekend (February 19-20) and some of our website services may be unavailable at times. We apologise for any inconvenience this may cause.
- В связи с техническим обслуживанием веб-сайт Melett будет временно недоступен в пятницу, 28 января, с 18:00 до 20:00 (CET). Приносим извинения за доставленные неудобства.
Festive opening hours
- Melett UK Will close 5:00pm Thursday 23rd December and reopen 8:00am Tuesday 4th January
- Melett Polska Will close 4:30pm Thursday 23rd December and reopen 8:00am Monday 3rd January
- Melett North America Will close 5:00pm Thursday 23rd December and reopen 8:00am Monday 3rd January
Please note: Due to essential maintenance the Melett website will be temporarily unavailable on Friday 10 December from 5:00PM (CET) to 11:00PM (CET). Apologies for any inconvenience caused.
Please note; Unfortunately, we are experiencing processing delays for all orders which may result in delays in shipping. If possible, please confirm orders at your earliest opportunity to help minimise disruption to our normal high standards. Please accept our apologies and rest assured that we are working hard to resolve the issue.
Melett Poland will be closed for a Public Holiday on Thursday 11th November. Any orders that are not picked or despatched on Wednesday 10th November will resume preparation when we return on Friday 12th November.
Melett Poland will be closed for a Public Holiday on Thursday 6th November. Any orders that are not picked or despatched on Wednesday 5th November will resume preparation when we return on Friday 7th November.
Melett will be closed for a Public Holiday on Thursday 11th November. Any orders that are not picked or despatched on Wednesday 10th November will resume preparation when we return on Friday 12th November.
Melett will be closed from 5 pm on Wednesday 24th November until 8 am on Monday 29th November for the Thanksgiving holiday
Online ordering now available
In addition to viewing inventory levels and pricing, you can now place orders directly from our website. Download our user guide below to help you get started.