[zha50]

What a surprise coming back to see the progress of the single turbo conversion. It's fantastic to see a application of a reasonably sized turbo on the BMW platform. All these turbos are on Evos or 2JZs.

What I'm really interested on is how the EFR7670 behaves on the 3.0L, and how the upper flow capacity will be like. Are you intending to monitor turbo shaft speed? It would be a good idea especially on a EFR not to overspread them.

I'm currently undecided between the 7670, and 8374, but leaning towards the smaller unit as a 62mm might really be too much of a response sacrafice for a street Aussie car. Even if the light weight turbine wheel etc.

Judging from the videos the boost threshold, spool rate and gear to gear transitions seem to be on par with what I expected from a EFR. Transients seem to be its biggest difference to the rest of the crop.

[Coupes33]

Originally Posted by vtl

M3 ones dont fit, these Megan racing arms are ball jointed instead of the stock rubber bushings.

Basically prevents the rear toe changing under heavy loads (ie acceleration). Results in a more predictable rear end. I have these on my car and found significantly improved rear end stability on oversteer.

Vince, Did the NVH increase having ball joints compared with the rubber bushings?

[vtl]

Originally Posted by Coupes33

Vince, Did the NVH increase having ball joints compared with the rubber bushings?

With the guide rods yes, tiny NVH increase barely perceptible after first installing them. Sharp bumps can be felt slightly more.

Toe arms, no couldn't feel a difference apart from the performance gains.

[Aus335iguy]

Originally Posted by vtl

With the guide rods yes, tiny NVH increase barely perceptible after first installing them. Sharp bumps can be felt slightly more.

Toe arms, no couldn't feel a difference apart from the performance gains.

Your inbox is full vtl

[vtl]

Originally Posted by Aus335iguy

Your inbox is full vtl

Cleaned out my inbox now

[Socket]

Originally Posted by zha50

What a surprise coming back to see the progress of the single turbo conversion. It's fantastic to see a application of a reasonably sized turbo on the BMW platform. All these turbos are on Evos or 2JZs.

What I'm really interested on is how the EFR7670 behaves on the 3.0L, and how the upper flow capacity will be like. Are you intending to monitor turbo shaft speed? It would be a good idea especially on a EFR not to overspread them.

I'm currently undecided between the 7670, and 8374, but leaning towards the smaller unit as a 62mm might really be too much of a response sacrafice for a street Aussie car. Even if the light weight turbine wheel etc.

Judging from the videos the boost threshold, spool rate and gear to gear transitions seem to be on par with what I expected from a EFR. Transients seem to be its biggest difference to the rest of the crop.

The 7670 is pretty responsive kicking in around 2500 rpm but tbh it is difficult to tell how well this will work out as the tune has not been completed yet

Will see the new boost box and Chris's latest batch of maps is any good.....

[Socket]

Originally Posted by Coupes33

A wheel alignment is now required Socks before the Tassie trip.

Alignment done

[Coupes33]

Originally Posted by Socket

Alignment done

Great work Socks. Was it out much?

[Socket]

Originally Posted by Coupes33

Great work Socks. Was it out much?

Front was ok, rear needed a small adjustment. $89 and back on the road

[zha50]

Originally Posted by vtl

My thoughts so far:

- The STFTs arent maxing out anymore, I think they must have played with the fuel scalars. Not sure if this is hiding a potential issue with the car, the AFRs don't go to 234:1 when off throttle with these ADV sensors. Not sure if that is normal

- This latest map just does around 47% WGDC flat to see how the system responds. As you can see, we pretty much only get wastegate pressure at 47% which is very poor. Previous logs I saw we needed 65-80% WGDC to get boost above wastegate pressure. With that poor response from the solenoid and wastegate it would be hard to control boost smoothly even if we got it to work.

Chris from Motiv reckons its the EFR's boost solenoid operates at a higher frequency, so running it at a lower frequency won't really work and could be causing our issues. He is sending us a boost box with higher frequency to test.

That's very strange indeed.

If you got a spare logging channel, putting a pressure sensor T off the line to the WG canister will give you a good idea if the solenoid is bleeding down correctly.

One of the design features is the IWG ports are at very shallow angles with the exhaust flow. You would have noticed that looking down into the inlet. High EGBP can cause the IWG flap to push open, but it would be unlikely at 10psi and the manifold design / 3" exhaust back.

I would first check if the boost box is controlling the solenoid properly, resulting in a pressure in the line between the actuator and solenoid, is lower than manifold pressure.

[Socket]

Just got back from Tas 2 cruise.. great trip and big thanks to Vince for organizing and the guys for making their way down from Sydney... 10 cars, 4 days and over 2000 KM on super twisty roads and some spirited driving along the way..... No breakdowns (who said the N54 was unreliable). The most unreliable car went to DrJs who's CP popped off. 2 min fix and he was on the way again. SPCGRY only mishap was a busted front lip (ran over a parking concrete block in the car park at Port Arthur Other then bug guts on the bonnet and windscreen, car and the ST ran great. Will post pics and vids of the trip on the cruise thread

[Socket]

Posting a test vid from the Tas 2 cruise

[Socket]

Couple of pics of spcgry from our recent cruise in Tassie

Now the cruise is out of the way we can get back to mods hahha

[Socket]

Copy of the Tas 2 cruise vid... enjoy

[EB89]

What’s next on the mod list

[Socket]

Originally Posted by EB89

What’s next on the mod list

fluffy dice

[kookie]

Originally Posted by Socket

fluffy dice

Finally.

The ultimate kilowasps upgrade.

[Socket]

Originally Posted by kookie

Finally.

The ultimate kilowasps upgrade.

Hahaha

[Socket]

SPCGRY meets his twin TKO335

[Chappers 71]

Maybes the owner was in money 3 trying to get a loan to spend on more mods
How's that ST working out?

[vtl]

After months trying to get the setup with the boostbox working, we are growing increasingly frustrated with the Motiv tune. With the response rate from Motiv averaging 0.5-1 week, this has dragged out for months with not much more than waste gate pressure achieved. I am certain we could be at this for a few months longer with no real progress.

The issue is that we cannot get much response out of the wastegate with the boost box. At 50% WGDC we get nothing but wastegate spring pressure out of the turbo. It requires around 70-80% to get some boost out of it. But after repeated attempts asking we have only received 45-50% wgdc maps. They have given us a boost box that operates at a higher frequency to match up with the EFR solenoid but this had very little effect. They don't appear to be interested in answering our questions or addressing our comments/concerns in the emails responses which also massively adds to the frustration. It really doesnt feel like they are working with us, and in general all the maps have been stabs in the dark.

We have decided to go with the N54 wastegate actuator, which in theory should allow OEM-like control of the EFR. Not having a 3rd party converter in the way is also a big plus. We will work with a local tuner in Melbourne who will be much more responsive than working with a busy company in the USA.

In order to fit the N54 wastegate actuator on the EFR, I have to fabricate up a bracket to make it fit. The N54 actuator is a 3 bolt pattern and the EFR IWG actuator is a 2 bolt. An adapter plate needs to be constructed, similar to those alloy wheel PCD adapters.

A couple of the guys at my work have constructed a mini foundry to melt metals, they got a huge number of old hard drives and melted down all the metal for projects. I obtained one of the melted down muffins and machined the outside round shape on my lathe. This worked very well and the material is quite good with little defects or porosity. The material itself appears to be a magnesium/aluminium alloy, it machines very well and forms fine chips instead of strings when machined.

I did a CAD drawing in Sketchup, but found the export options quite poor. It was still useful visualizing the part and making sure it can actually be made. If the bolt spacing for the EFR was different, it may overlap the holes for the N54 wastegate and I would have to make the part from 2 pieces. It ended up being possible to make it from one piece, and I redid the part in QCAD for the 2D export. I printed this out at 1:1 ratio and overlaid the paper on the metal part, then centre punching all the holes. I then drilled out all the holes using a drill press.

I found the 14mm holes for the N54 wastegate were too small to fit any of my sockets in. I ended up machining a spare socket so I could actually assemble the part.

Finishing touches required are:

- 14mm holes for the N54 actuator nuts were drilled with a normal drill. This has a 60degree point, but I need a flat hole. 14mm end mill has been purchased
- Stud holes for the EFR have not been tapped all the way. A normal M6 tap can't go very deep. Have ordered an M6 bottoming (plug) tap to finish the hole all the way down.
- The N54 wastegate rod is too short by about 10mm This makes it hard to extend. If it was very short itd be easy, put a coupling nut on it and screw in a threaded rod. Will need to cut the rod and extend it out, and hopefully the coupler won't interfere with the wastegate arm. M6 threaded rod has been ordered

[BSG335]

Originally Posted by Socket

Copy of the Tas 2 cruise vid... enjoy

Great couple of vids... I've been through Tassie before and driven up to Cradle Mountain. You've really captured some of the beauty of this little island. Loved the sound of your tubro spooling throughout

Awesome road trip and I hope to be able to join the next one.