Posts Tagged ‘ Turbo ’

Astra VXR Rolling Road Health Check

It is always useful to have a car checked from time to time on the rolling road, as it can show up potential running issues.

We had this Astra H VXR Nürburgring brought in for a health check on the rolling road this week, due to it feeling ‘down on power’ after a manifold swap by the owner, so running it up and datalogging it should highlight any issues.

We carried out an initial check over of the vacuum pipes, recirculation valve and actuator just to make sure nothing physical was at fault which could cause a problem. The ecu was also checked for any stored trouble codes, again to see if there was anything that could cause a running issue.

Running the car up on the rolling road whilst datalogging found the turbo to be down on boost, making less bosst pressure than expected  and resulting in 255bhp and 290 lb ft torque down on what is expected from a Nurburgring with a remap.

Additional checks were carried out to the boost hoses and intercooler fittings, which showed no leaks or issues.

After further runs, the turbo was shown only to be capable of making a maximum of 20psi overboost, and unable to make the required boost at peak power (around 5,700rpm), so identifying the root cause of the problem to be a failing turbocharger.

Astra VXR Health Check

Astra VXR Health Check

Poly Exhaust Mounts Now Available

Having now tested these exhaust mounts for fit, they have also undergone successful road and track testing and we are pleased to be able to offer them for sale.

Powerflex Exhaust Mount

Powerflex Exhaust Mount

These uprated exhaust mounts are manufactured in a high temperature polyurethane material with a Shore A hardness of 67, compared to the original rubber mounts which measured 55 Shore A.

They are much stronger, more durable, with much less flex due to the material type and a reduction in the size of the centre cut-out, offer far greater resistance to tearing and rot resulting in much less exhaust movement. OE Exhaust Rubbers are prone to cracking and failing, quite often causing an exhaust knock often most noticeable on start up.

An inexpensive and worthwhile upgrade. The number required per car will vary but this mount will suit Astra G, Astra H, Vectra B, Vectra C, Meriva A, Meriva B, Signum, Omega, Corsa C, Tigra B, Zafira A and Zafira B where 90466688 is specified.

Note: This mount cross references to OE Part Number 90466688

Priced at £6.60 each

Turbo Failure – The Truth About Dirty Oil………

…… and how it will kill your turbo.

All too often we hear of turbo failure of the K04 turbocharger, as used on the Z20LEx engines in Astra G and H, Zafira A and B, VX220 and all too frequently we hear the turbochargers being blamed as poor quality or ‘rubbish’ units, which is not the case.

In nearly all cases of turbo failure, the source of the problem is not down to the unit itself but usually due to oil contamination and/or incorrect fitting procedure. It is also important to carry out eliminating the initial cause of failure, if it was a failure caused by something other than old age/wear and tear. Additionally allowing oil to get dirty during use and poor or infrequent oil changes using poor quality oil will also contaminate the turbo causing failure.

The picture gallery below contains images from of a ‘failed turbo’ that was under 10,000 miles old which was dis-assembled and inspected and a report produced. The cause of the bearing failure in the turbo is down to contaminated dirty oil….. you cannot blame the turbo itself for the failure.

Here is the report, basically detailing how dirty oil has ‘scrapped’ the turbo:

Turbo Report

Turbo Inspection Report

The good news is the wastegate assembly and actuator are still in good condition!

Some pictures of the damaged components:

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Oil Contamination Fact Sheet:

Oil Contamination Fact Sheet

Oil Contamination Fact Sheet

The Courtenay Sport Blog

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