ok so pornography time.

I actually kept my first EFR6258 (as in, haven't sent it in for replacement YET). So I can compare old EFR6258 to new EFR6758

First of all, ALL HAIL INTACT TURBINE WHEEL in it's Gamma-Ti glory



Then, turbine housings. This is one area that changed, and imho, got worse. Before it was gorgeous now it's a bit worse. There are casting marks and it just doesn't look as sexy anymore.



Wastegate are in particular was smoother before. I'll probably polish the new housing a bit to make it smoother.



Slight, minor differences everywhere


Area around turbine wheel is machined and is same, though.



Awesome CHRA with mega-super-awesome bearings and stuff.



Old vs new. Old compressor wheel ingested some shavings early in it's life (i'm sorry...) so there's that. Lesson learned - keep compressor housing clean and filter ON.


Compressor housings haven't changed slightest bit - other than the fact that they are for different wheels


6758 housing with 6258 compressor wheel shows the size diffeerence pretty clearly. It's not much but good enough to change 'rated' hp from 400 to 450.






The hole is for the speed sensor, which I got for free (winning!)



The box is a "speed converter" box. It's like $60 and converts a square wave signal into 0-5V reading, 5V being 200'000 RPM. It's made specifically for EFR speed sensor and comes with with nice sleeved connectors. Me likey. It was also a freebie.


And just some compressor wheel pornography.

 

Everything looks good both times!

 

Can't tell from the pics - where does the speed sensor read from? Are there teeth on the back of the wheel? How many?

 

Based on the marketing literature. The investment casting process (which I have not looked up) is how the turbine housing for the original was so sweet and smooth.

 

No teeth, it sees the blades themselves IIRC.

 

^Yup. It appears to be reading a few mm up from the base of the blades.

 

That's a lot of triggering at 200,000rpm. No wonder they used that circuit, no ECU will be able to handle ~33,000 interrupts per second just for the speed sensor of the turbo.

 

It's got a built in divider of 8, but still, reading 12 (or 14 for most EFR) blades @ 160000rpm is like 4000hz

You can read more about the speed sensor here - http://www.full-race.com/articles/efrturbotechbrief.pdf - just go down to Speed Sensor section.

converter box thingy: TSS - Turbo Speed Scaler for use exclusively with Borg Warner speed sensor equipped turbos

 

Eventually I will have to get one of those, just to have it on a gauge to amaze passengers or something.

Can MS3 log it? It would also be cool to see that data included with boost and hp/tq numbers.

 

yes, MS can log a bunch of 0-5v inputs. Almost any EMS can log analog 0-5v inputs.
I also bought this $13 beauty. I might get it working
http://www.ebay.com/itm/280903275997...84.m1497.l2649

 

Duh, I guess I can't read

But your $13 display is one digit short! If there is some way you can get it to show it would work though.

Edit: answered my own question.

I assume this means you can just set it for 10 pulses = 1 rpm, and then it will display the rpm/10.

 

well, it's made in china and instructions are machine translated from chinese to english. but with that said...
so there is an option to specfiy a divider...

 

I wonder if MS3 can do turbo over speed protection. You know, for when you run allofit.

 

pretty sure I would have to code that myself.

 

I bet if you bugged Ken or James it would take them ten minutes.

 

Uh.. I'm a developer myself. Would be a good time to dick around with MS code anyways.

 

Oh so you could write it to be as awesome as you wanted. Any where between a closed loop control that reduces the EBC boost target to switching to a conservative boost table if the value is exceeded. Or something.

 

I forgot you're russian. Of course.

 

sure.
could have a setting to automatically submit an RMA request if turbine spins over 300k or something

 

Holy ****, had no idea those had a speed sensor. That is rad.