[TDIwyse]

Originally Posted by DWR

Yes, you are correct.



Not sure if it is LP or HP. I would guess it is HP because that is the one that could have a problem if some of the actuators fail. STAT_ASMod_nTrbCH_WERT, number 129 in MESSWERTTAB

Also OBD PID74 that may be dead, STAT_OBD_PID74_I15031_A_WERT

Thanks. Will try to look at that this weekend. I would like to see the LP/big turbo speed ... but should be able tell which one it is when looked at versus rpm.

[TDIwyse]

DWR, which turbo shaft speed do you think that AsMod is calculating? Wouldn't we expect the little turbo to be getting bypassed at those upper rpm's?

[DWR]

Originally Posted by TDIwyse

DWR, which turbo shaft speed do you think that AsMod is calculating? Wouldn't we expect the little turbo to be getting bypassed at those upper rpm's?

Yes we would. Looks like the LP turbo to me - its nice to be lucky.

But let's not loose sight of the fact that this is a calculation. For instance, with the stock exhaust system we could expect some hefty back pressure. If AsMod is using the exhaust manifold pressure sensor to fit a correlation to turbine drive pressure, turbine speed maybe higher in your vehicle. If it is using MAP and VE then it could be a good number - we just don't know. Hmm, there might be a way to test that ...

I know the HP turbo can spin to 200,000 without worry. Not sure what the maximum rotational speed of the LP tubo is. A call to Borg Warner might be advised. Their part number 5326-988-6720 is same basic turbo as ours, with perhaps slightly different inducer wheel diameter and A/R.

[TDIwyse]

Originally Posted by DWR

...
I know the HP turbo can spin to 200,000 without worry. Not sure what the maximum rotational speed of the LP tubo is. A call to Borg Warner might be advised. Their part number 5326-988-6720 is same basic turbo as ours, with perhaps slightly different inducer wheel diameter and A/R.

Thanks for the reply.

http://www.e90post.com/forums/showpo...&postcount=240

The last line on this K26 compressor map is 150k .... yikes.

Would really like to see some logs from guys who are showing boost over 3000 mbar at those upper rpm's to see what they're showing from the intake (boost) and exhaust manifold pressure, and the calculated turbo drive shaft speed.

[zackz]

Originally Posted by TDIwyse

Thanks for the reply.

http://www.e90post.com/forums/showpo...&postcount=240

The last line on this K26 compressor map is 150k .... yikes.

Would really like to see some logs from guys who are showing boost over 3000 mbar at those upper rpm's to see what they're showing from the intake (boost) and exhaust manifold pressure, and the calculated turbo drive shaft speed.

The problem is that our K26 is bigger than the one in the compressor map...

We've got 50.33 mm compressor wheel inducer...

[TDIwyse]

Originally Posted by zackz

The problem is that our K26 is bigger than the one in the compressor map...

We've got 50.33 mm compressor wheel inducer...

Interesting. Do you have a compressor map for that configuration?

[zackz]

Originally Posted by TDIwyse

Interesting. Do you have a compressor map for that configuration?

Unfortunately no...

The best way is to ask Borg Warner directly I think.

About our KP39, we've got 33.50 mm compressor wheel inducer.

Hybrid turbos compressors are around 5 mm bigger with more permissible turbine wheels...

[TDIwyse]

Originally Posted by zackz

Unfortunately no...

The best way is to ask Borg Warner directly I think.

About our KP39, we've got 33.50 mm compressor wheel inducer.

Hybrid turbos compressors are around 5 mm bigger with more permissible turbine wheels...

That K26 compressor map was from BorgWarner.

http://www.turbos.borgwarner.com/files/pdf/K26.pdf

They show one map and list 2 different turbo configurations... So you're saying that particular map is for the smaller compressor configuration?

[DWR]

Originally Posted by zackz

The problem is that our K26 is bigger than the one in the compressor map...

We've got 50.33 mm compressor wheel inducer...

Yes, that is a problem. In general, big wheel = lower rotational speed limit.

[DWR]

Originally Posted by TDIwyse

That K26 compressor map was from BorgWarner.

http://www.turbos.borgwarner.com/files/pdf/K26.pdf

They show one map and list 2 different turbo configurations... So you're saying that particular map is for the smaller compressor configuration?

I have not measured any dimensions on our compressors, but according to zackz's info our LP turbo is larger than either of the 2 listed. That may help us with understanding airflow, but in my mind it just causes me more concern about overspeeding.

Thanks zackz. I never had the that dimension info before, really helpful.

[zackz]

Originally Posted by TDIwyse

That K26 compressor map was from BorgWarner.

http://www.turbos.borgwarner.com/files/pdf/K26.pdf

They show one map and list 2 different turbo configurations... So you're saying that particular map is for the smaller compressor configuration?

Our k26 turbo for sure isn't listed in the sheet, it should be able to handle a little more boost and air flow, but less speed too...

That's why we should ask borg warner for our part number turbo compressor map.

[zackz]

Originally Posted by DWR

I have not measured any dimensions on our compressors, but according to zackz's info our LP turbo is larger than either of the 2 listed. That may help us with understanding airflow, but in my mind it just causes me more concern about overspeeding.

Thanks zackz. I never had the that dimension info before, really helpful.

you're welcome, thanks to all for your help

[Gearhead51]

Iaknown, can you recommend a reamer? I see many different styles. I have drill bits, reverse bits, easy outs, and time certs, but no reamers! Looks like I need to make additions to my tool arsenal.

[2deerwhistlers]

Originally Posted by Gearhead51

Iaknown, can you recommend a reamer? I see many different styles. I have drill bits, reverse bits, easy outs, and time certs, but no reamers! Looks like I need to make additions to my tool arsenal.

Carbide bit on a die grinder

[iaknown]

Originally Posted by Gearhead51

Iaknown, can you recommend a reamer? I see many different styles. I have drill bits, reverse bits, easy outs, and time certs, but no reamers! Looks like I need to make additions to my tool arsenal.

I would recommend 4 standard chucking reamers with a 1/2" shank (to fit a 1/2" chuck drill). Stock size is 7/16" so you'll need 15/32", 1/2", 17/32" and 9/16". Or you can try 1/16" increments but that's taking a lot of material out (may be doable though).

You will also need what 2deer mentioned to clearance behind the flapper, although a regular high speed steel burr w/die grinder will work ok too.

[Gearhead51]

Thanks. Reamers aren't cheap, for sure. I guess a tapered reamer is the wrong type.

When my DDE gets back from Jarek, I'll rack the car and give this a try, because it uses things I already have. http://www.bellengineering.net/artic...rticles_id=273

[iaknown]

Originally Posted by Gearhead51

Thanks. Reamers aren't cheap, for sure. I guess a tapered reamer is the wrong type.

When my DDE gets back from Jarek, I'll rack the car and give this a try, because it uses things I already have. http://www.bellengineering.net/artic...rticles_id=273

Are you referring to using a die grinder and carbide cutter? Don't do it. It won't work for our turbos and you'll run the risk of ruining it. The wastegate port in our housings looks nothing like in those pictures. Ours are much smaller diameter and a much longer hole, you'd never be able to use a rotary cutter and get it even and straight all the way through, not to mention it'd be a lot messier for the rest of the turbo. Reamer is the way to go.

That being said where are you looking for reamers? Google is your friend. I just found 2 of them under $15 without even trying, for example:

http://www.handsontools.com/Drill-Am..._p_120140.html

http://www.wholesalepowertools.com/t...B#.VQDta_nF98E

[Gearhead51]

Ah. Having never purchased reamers, I was afraid of the low cost ones, just like I don't buy cheap drill bits. I saw quite a few around $35ish, and figured I'd be in over $140 in reamers that I may never use again.

[iaknown]

Originally Posted by Gearhead51

Ah. Having never purchased reamers, I was afraid of the low cost ones, just like I don't buy cheap drill bits. I saw quite a few around $35ish, and figured I'd be in over $140 in reamers that I may never use again.

I can understand your concern but reamers are much more stable than drill bits. Plus you are only opening a hole in a cast housing, cuts like butter compared to other metals. Go with the cheap ones, cut easy, use some cutting fluid/oil and you'll be fine.

[Gearhead51]

Ok. I ordered the reamers. They are about $6.00 ea on buydrillbits.com except the 17/32" which was $22. My order was under $50 shipped.

[iaknown]

Originally Posted by Gearhead51

Ok. I ordered the reamers. They are about $6.00 ea on buydrillbits.com except the 17/32" which was $22. My order was under $50 shipped.

There ya go, good deal

[BB_cuda]

Can someone explain (perhaps again if in thread earlier, sorry) how to get the flap open? Is it a simple pull on it type of thing of do you have to vacuum actuate or something? Thanks