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Piggaz

Borg Warner EFR Series Turbo's V 2.0

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Posted (edited)

you're overthinking it and your gut feel is way off. Its primarily an oil drainage concern. 

the axial thrust forces on a compressor/turbine assembly are huge when operating at high mass flows. force on the thrust surfaces due to gravity will be orders of magnitude less. the compressor its trying to suck itself out the front of the turbo and the turbine is trying to blow itself out the exhaust. yes, these forces are in opposite directions but do not cancel completely which is why journal bearing turbos require a thrust bearing as they have no inherent axial stability otherwise.

from your chart the most appropriate bearing for a CHRA would either be a pair of identical 7s or a pair of 6s in a mirrored arrangement.

main concern is oil drainage and oil pooling at the back of the CHRA if the angle is excessive, for the same reason a maximum of 20degrees of rotation about the shaft axis is recommended.

remember, accelerating and braking the car at ~1g is going to impart more force on the rotating assembly than inclining it by even 45 degrees, let alone 10 or 20.

 

 

this is a question that should be directed at BW.

Edited by burn4005
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A little off topic here but this seems like the best place to ask, how would response be on an Airwerks turbo in twin scroll on a built 2.6L. Something like a S362SXE compared to the -5s on sitting on my shelf.

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On 6/5/2021 at 6:09 AM, Josh222 said:

A little off topic here but this seems like the best place to ask, how would response be on an Airwerks turbo in twin scroll on a built 2.6L. Something like a S362SXE compared to the -5s on sitting on my shelf.

the SXE will spool about 300rpm later and have more top end.  good, simple, journal bearing turbo.

since this is the EFR thread - a mild 2.6L build with EFR8374 using internal wastegate/internal bov is a phenomenal performer.  it's about the same price as airwerks with external wg/bov if cost is the airwerks factor

Edited by Full-Race Geoff
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On 04/05/2021 at 11:40 AM, burn4005 said:

you're overthinking it and your gut feel is way off. Its primarily an oil drainage concern. 

the axial thrust forces on a compressor/turbine assembly are huge when operating at high mass flows. force on the thrust surfaces due to gravity will be orders of magnitude less. the compressor its trying to suck itself out the front of the turbo and the turbine is trying to blow itself out the exhaust. yes, these forces are in opposite directions but do not cancel completely which is why journal bearing turbos require a thrust bearing as they have no inherent axial stability otherwise.

from your chart the most appropriate bearing for a CHRA would either be a pair of identical 7s or a pair of 6s in a mirrored arrangement.

main concern is oil drainage and oil pooling at the back of the CHRA if the angle is excessive, for the same reason a maximum of 20degrees of rotation about the shaft axis is recommended.

remember, accelerating and braking the car at ~1g is going to impart more force on the rotating assembly than inclining it by even 45 degrees, let alone 10 or 20.

 

 

this is a question that should be directed at BW.

 

Few days late, and obviously not an EFR; but for what it's worth I've worked on a customer's 67 Impala that had twin GTX3582R's mounted vertically down on the bellhousing. Dry sump, so gravity drainage wasn't an issue, and no bearing problems.

 

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20160611_105617.jpg

Edited by Unzipped Composites
Found a better picture
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Hey guys got tired of reading I got to page 100+ though around where the guy with the Supra with the nitrous. 
 

so my build rb30/26 with 9280 1.05 ar 

built head, cams are gsc s2

built block with 9.1 

on e85 and haltech/motec haven’t decided which one. So is there finally a verdict on a 9280 test on how much power it’ll put down?

how much bar/psi can I run? 
 

Im a circuit guy and I don’t really care about drag/ power so long as I get some bad ass lap times but, could I reach 1000 whp on an American dyno?

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22 hours ago, mugiwara no luffy said:

rb30/26 with 9280 1.05 ar built head, cams are gsc s2 built block with 9.1 on e85... is there finally a verdict on a 9280 test on how much power it’ll put down?...how much bar/psi can I run? Im a circuit guy and I don’t really care about drag/ power so long as I get some bad ass lap times but, could I reach 1000 whp on an American dyno?

not sure if trolling or not, but you can use the matchbot page to accurately determine your parameters.  if you plan to run 1000whp on a circuit, youve got your work cut out for you

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On 09/06/2021 at 1:26 PM, mugiwara no luffy said:

haltech/motec haven’t decided which one

Better choose MoTec, because apparently according to BW EFR Aficionados, Haltech ECUs causes motors to turn backwards.

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On 09/06/2021 at 1:26 PM, mugiwara no luffy said:

Hey guys got tired of reading I got to page 100+ though around where the guy with the Supra with the nitrous. 
 

so my build rb30/26 with 9280 1.05 ar 

built head, cams are gsc s2

built block with 9.1 

on e85 and haltech/motec haven’t decided which one. So is there finally a verdict on a 9280 test on how much power it’ll put down?

how much bar/psi can I run? 
 

Im a circuit guy and I don’t really care about drag/ power so long as I get some bad ass lap times but, could I reach 1000 whp on an American dyno?

A 9274 with 1.45 rear has made 1000hp in Australia on a hub dyno so you should have a pretty good shot at it

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6 minutes ago, usmair said:

A 9274 with 1.45 rear has made 1000hp in Australia on a hub dyno so you should have a pretty good shot at it

9280. Powertune were corrected and never updated the post.  

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thanks for the info! 
A friend of mine pioneered the Japanese tuners to stop using 90’s era t88s, gt-rs,and t51r’s back when the efr series started getting popular. Efr turbo’ed GTR’s were smashing the big turbo guys like me at Fuji so I figured I’d make the switch too. Just hard to find a quality tuner here in the states. I’m shooting for the moon I mean anything worth doing is worth over doing. 
Motor should be done here in a couple of months so I’ll post a dyno when I get it tuned. 
 

oh i bought the install package but didn’t come with the bolts to connect the super core to the exhaust housing any ideas what those bolt sizes are?

335609E1-0CA3-4611-B3BC-615C2415E004.jpeg

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