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Lots of people have asked why the rear wheels were moving on my Clubsport and about the tuning box so here the answers directly from Matt at Racingline;
1)Why does the dyno drive the rear wheels on my Clubsport? I know the 2 rollers are mechanically linked, what is the benefit of this? I thought more accurate drag calculation maybe?
You are correct, they are mechanically linked rollers which is why the rear wheels are turning on your Clubsport. However, it does not change the drag calculations on your dyno graph as we change the setting when swapping cars to only read the front load cell and not the rear on FWD cars.
When we dyno’d the Golf 8R, I then changed the setting to allow it to read the rear load cell as well, which then gave an accurate reading for the Golf 8R to allow for rear losses.
As it is mechanically linked, there is no way for us to lock out the rear rollers. Also a lot of cars have rear speed sensors, so if you lock out the rear and the front wheels move without the rear wheels, this will often limit power. This is one of the reasons why we have a mechanically linked dyno, as well as then having an accurate reading for 4WD and RWD cars.
2)Is the tuning box on sale yet and if so how much is it and what gains are expected?
It is not on sale yet, we’re still in the manufacturing process which has been delayed due to chip shortages and COVID. Gains wise it is very vehicle dependant, but on the Clubsport and the Golf 8R we’re seeing circa +25-30HP and +30-40Nm.
It's well known that Mk8 Golf Rs are producing significantly over the factory quoted figure of 320 PS (316 bhp) when they are tested on a dyno. I thought it would be an interesting exercise therefore to put my Mk8 Golf GTI Clubsport on a dyno and see how much over the quoted 300 PS (296 bhp) that is was producing. It's never going to produce more power than an R but could any gains over stock allow it surpass the R's 1.14 bhp per tonne power to weight ratio advantage which is a much better indicator of real world performance.
Using VW's quoted bhp & weight figures;
Mk8 Golf R weight 1551 kg = 203.74 bhp per tonne
Mk8 Golf GTI Clubsport weight 1461 kg = 202.60 bhp per tonne
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