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Just got back a little while ago from GRD Performance here in the Chicago area where we ran our R32 on their DynaPack AWD hub dyno. The DynaPack hub dyno is considered one of the most accurate dynos available and is unique from the more common "roller" dynos (DynoJet and Mustang) in that you remove the wheels from the car and attach the DynaPack pods directly to the hub:
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PLEASE READ CAREFULLY:
The goal here is for us to get a baseline dyno number for our stock R32. The dyno numbers below can NOT be compared to any other dyno run or any other R32 as there are far too many differences in individual cars, individual dynos, weather, conditions, etc., etc.
Also, the following dyno info is taken from an AWD dyno and is NOT comparable to the numbers you get on a regular FWD/RWD dyno run as there is more driveline loss associated with routing power from the engine crank, through the transmission and through the AWD driveline. We also are not going to draw any conclusions as to what kind of crank horsepower our car is making as there is NO reliable rule of thumb as to the driveline loss. Even the stock horsepower that VW quotes is suspect as we have it on reliable sources that the R32 and TT3.2 indeed make the same horsepower (we'll try and confirm this on this dyno in the future) even though VW markets the R32 with 240hp and Audi markets the TT3.2 with 250. Either way, we can't simply take the 240hp VW claims and divide it buy the hub horsepower we got on our car as the R32 may not be making a true 240hp stock.
So, again, our goal here was to see what kind of horsepower and torque our R32 is getting down to the hubs on a DynaPak dyno as a baseline for further modifications. We also wanted to see what affect on power disconnecting the exhaust flapper valve would have. The stock R32 exhaust has a flapper valve built into it that is activated by a vacuum line. When the flap is closed, the exhaust is much quieter up till about 3,000 RPM where it will open up to allow more flow through. This is reportedly built into the exhaust to help the R32 pass noise regulations in a variety of different markets. We had heard reports that disconnecting the vacuum line to the exhaust would potentially free up more power. So we did a few runs bone stock and a few with the exhaust flapper valve vacuum line disconnected and plugged.
Bone stock our R32 put about 208.2 horsepower to the hubs. Torque on the stock car peaked at 206.4 lb-ft. The dip you see in the curve is most likely the variable intake manifold kicking in.
With the exhaust flapper disconnected peak horsepower went up to 212.3hp and torque was up to 210.9 lb-ft at the hubs.
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We'll have a complete article on this along with a few comparison dynographs from the same dyno in the future. For instance a stock WRX puts around 159hp and 178 lb-ft of torque to the hubs on this same dyno. A stock B5 Audi S4 (twin-turbo V6) puts out 200hp and 225 lb-ft of torque (although you have to look at the graphs as the S4 makes more power under the whole curve than the R32).
Anyway, that's where we stand right now. We'll have to see what we do next from here...
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-jamie
PLEASE READ CAREFULLY:
The goal here is for us to get a baseline dyno number for our stock R32. The dyno numbers below can NOT be compared to any other dyno run or any other R32 as there are far too many differences in individual cars, individual dynos, weather, conditions, etc., etc.
Also, the following dyno info is taken from an AWD dyno and is NOT comparable to the numbers you get on a regular FWD/RWD dyno run as there is more driveline loss associated with routing power from the engine crank, through the transmission and through the AWD driveline. We also are not going to draw any conclusions as to what kind of crank horsepower our car is making as there is NO reliable rule of thumb as to the driveline loss. Even the stock horsepower that VW quotes is suspect as we have it on reliable sources that the R32 and TT3.2 indeed make the same horsepower (we'll try and confirm this on this dyno in the future) even though VW markets the R32 with 240hp and Audi markets the TT3.2 with 250. Either way, we can't simply take the 240hp VW claims and divide it buy the hub horsepower we got on our car as the R32 may not be making a true 240hp stock.
So, again, our goal here was to see what kind of horsepower and torque our R32 is getting down to the hubs on a DynaPak dyno as a baseline for further modifications. We also wanted to see what affect on power disconnecting the exhaust flapper valve would have. The stock R32 exhaust has a flapper valve built into it that is activated by a vacuum line. When the flap is closed, the exhaust is much quieter up till about 3,000 RPM where it will open up to allow more flow through. This is reportedly built into the exhaust to help the R32 pass noise regulations in a variety of different markets. We had heard reports that disconnecting the vacuum line to the exhaust would potentially free up more power. So we did a few runs bone stock and a few with the exhaust flapper valve vacuum line disconnected and plugged.
Bone stock our R32 put about 208.2 horsepower to the hubs. Torque on the stock car peaked at 206.4 lb-ft. The dip you see in the curve is most likely the variable intake manifold kicking in.
With the exhaust flapper disconnected peak horsepower went up to 212.3hp and torque was up to 210.9 lb-ft at the hubs.
We'll have a complete article on this along with a few comparison dynographs from the same dyno in the future. For instance a stock WRX puts around 159hp and 178 lb-ft of torque to the hubs on this same dyno. A stock B5 Audi S4 (twin-turbo V6) puts out 200hp and 225 lb-ft of torque (although you have to look at the graphs as the S4 makes more power under the whole curve than the R32).
Anyway, that's where we stand right now. We'll have to see what we do next from here...
-jamie
