Golf R - APR Stage 3 Upgrade

[jamesatfish]

Had a shakedown run on the dyno this morning to see how the car was running and to iron out some issues with the fuelling. Looks like we'll need a beefier fuel pump controller as the high pressure fuel pump draws too much current for the standard controller - APR are working on the issue and looks like the fix is simply grabbing a controller out of the TTRS to match the TTRS pump.

Despite that, and the dyno operator backing off as the car leaned out a bit too much for his comfort, the R pulled a nice 262.5kW at all 4 wheels.

The dip in the graph is the DSG trying to sort out the additional power as the boost comes on strong - will be interesting to see if that still happens once we upgrade the clutch packs. You do get a brief but noticeable 'pause' in acceleration on the road so it makes sense to see this correlation on the dyno graph.

For comparison on the same dyno we pulled 188.5kW with just the Stage 1 tune, so a net gain of 74kW at the wheels.

[Deadpool]

What's with the massive dip?

Epic gains though!

[jamesatfish]

What's with the massive dip?

Originally I thought it was the DSG dropping torque as a way to prevent clutch slippage, but turns out it's the ESP cutting power for a moment when the turbo hits peak boost. At that point the boost jumps from ~20psi to around 30psi almost instantly which I guess might seem to the ESP sensors like the wheels have dropped onto a surface with much lower grip, hence the ESP pulls back the power for just a moment.

There are a few little things left to sort out so the next time the car goes on the dyno we'll do some runs with ESP disabled (by fuse) to confirm the hypothesis.

[Deadpool]

Originally I thought it was the DSG dropping torque as a way to prevent clutch slippage, but turns out it's the ESP cutting power for a moment when the turbo hits peak boost. At that point the boost jumps from ~20psi to around 30psi almost instantly which I guess might seem to the ESP sensors like the wheels have dropped onto a surface with much lower grip, hence the ESP pulls back the power for just a moment.

There are a few little things left to sort out so the next time the car goes on the dyno we'll do some runs with ESP disabled (by fuse) to confirm the hypothesis.

Ahh yes, I've heard heaps of things on Vortex about pre-MY12 not being able to full defeat the ESP. Also, jesus 30PSI! That's insanely high.

[Pullstarter]

Awesome result James, be sure to let us know how the car goes reliability wise. Modding a car that heavily kind of scares of me a bit lol. But I must say the results are the nuts!

[jamesatfish]

Awesome result James, be sure to let us know how the car goes reliability wise. Modding a car that heavily kind of scares of me a bit lol. But I must say the results are the nuts!

Will certainly report back on the long-term reliability of the car once all the teething problems are sorted.

It's my daily driver so I don't want a car that's anything other than bulletproof - the clutch upgrade is a certainty and I'm prepared to go to a Stage 4 built motor if there are any reliability concerns with the engine internals, but at this point I can't see that being needed unless I can't shake the itch for more power...