George Smooth
///Member
As a lot of you guys saw I battle to get a decent time on Sunday. Started of with a 13.9, then a 13.8 and finally a 13.6 with 8km/h missing from my exit. My best to date is a 13 flat on a night with far less traction than yesterday. In the morning on the way to the track the car was seriously motoring and I was convinced I would be making a record run.
I am running a shorter final drive 3.85 and I thought my bad times are due to the 2.6 second 60ft recordings but things still didn't gel. If I ran a 2.0 which is my average it means I would only be .6 seconds or so faster.
On my third run I heard the turbos whining badly which I have only heard once before on the dyno when we experimented to see the limitations of the turbos and maximum airflow. So I took the car on the road with the logger. My finding where that the waistegates where staying closed virtually right through the rev range and I would still not achieve target boost hence a leak. The intake temperatures where shooting to 90 degrees when they should be around 40 degrees with 20 degree ambient at the time due to the turbos spinning there best to try make the required boost.
I came straight home off boost and started looking for the leak. I didn't find anything, all the pipes where as tight as Celine Dion at 24 years of age. I was baffled. Then last night I came across a post on another forum with someone that had problems with Forge Dumpvalves and found a pdf document with the service requirements etc. I went straight back to the car and the first DV I took out was stuck open due to muck from oil formation. Moral of the story is we always take things for granted, fit parts etc but sometimes don't worry to oil and service them regularly. It could of cost me my turbos and maybe even the motor if things have let go I was lucky with just a bit of damage to my pride.
I am running a shorter final drive 3.85 and I thought my bad times are due to the 2.6 second 60ft recordings but things still didn't gel. If I ran a 2.0 which is my average it means I would only be .6 seconds or so faster.
On my third run I heard the turbos whining badly which I have only heard once before on the dyno when we experimented to see the limitations of the turbos and maximum airflow. So I took the car on the road with the logger. My finding where that the waistegates where staying closed virtually right through the rev range and I would still not achieve target boost hence a leak. The intake temperatures where shooting to 90 degrees when they should be around 40 degrees with 20 degree ambient at the time due to the turbos spinning there best to try make the required boost.
I came straight home off boost and started looking for the leak. I didn't find anything, all the pipes where as tight as Celine Dion at 24 years of age. I was baffled. Then last night I came across a post on another forum with someone that had problems with Forge Dumpvalves and found a pdf document with the service requirements etc. I went straight back to the car and the first DV I took out was stuck open due to muck from oil formation. Moral of the story is we always take things for granted, fit parts etc but sometimes don't worry to oil and service them regularly. It could of cost me my turbos and maybe even the motor if things have let go I was lucky with just a bit of damage to my pride.
