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Old 10-14-2014, 09:48 AM   #1
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Default Not Mine: 2 INDYCAR EFR6758 turbos $450 each

A friend posted this on the Indiana Miata Owners facebook group. That's all I know about those turbos.

https://www.facebook.com/groups/2462...0436810751945/
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Old 10-14-2014, 11:23 AM   #2
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Can you post up the text for those of us who don't use facebook?

Have a friend with a few indy motors and turbo manifolds but no turbos. He may be interested.
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Old 10-14-2014, 11:34 AM   #3
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The price is too good to be true? Caveat emptor?
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Old 10-14-2014, 11:44 AM   #4
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Regular EFR 6758 has 7 compressor blades, the one in picture has 6.
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Old 10-14-2014, 11:44 AM   #5
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Old 10-14-2014, 02:37 PM   #6
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Quote:
Originally Posted by facebook post
Borg Warner EFR 6758 turbo's off of a couple Indy Cars, $450 ea.



Looks like it's the same as that Ebay ad.

Quote:
Originally Posted by soviet View Post
Regular EFR 6758 has 7 compressor blades, the one in picture has 6.
Hmmm, full-race has pictures of both 6 and 7 bladed compressors. BorgWarner EFR 6758 Turbo - Full-Race.com The picture they show for the T4 .80 has 6 blades. Or maybe the INDYCAR ones are different. I don't know.
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Old 10-14-2014, 03:32 PM   #7
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No integrated BOV either.
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Old 10-15-2014, 12:31 AM   #8
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Yep its the same ebay ad and is from the same seller in Indiana. Its legit

Quote:
Originally Posted by thenuge26 View Post
Hmmm, full-race has pictures of both 6 and 7 bladed compressors. BorgWarner EFR 6758 Turbo - Full-Race.com The picture they show for the T4 .80 has 6 blades. Or maybe the INDYCAR ones are different. I don't know.
http://www.full-race.com/articles/efrturbotechbrief.pdf
page 67
Quote:
The speed sensor is powered by a +5V supply, and the return signal is a
variable frequency square wave that has maximum amplitude of 5V and
has a 50% duty cycle. The frequency of this signal depends on the
speed of the wheel. Each passing blade creates a pulse, and all the EFR
wheels have 14 blades except for the 67mm (which has 12 blades).
The
sensor embedded electronics divides the blade-pass frequency by 8, and
then the resulting count forms the output waveform. Here is an
example:
Well apparently I'm wrong and its the other way. 6758 has 6 blades (well, 6 visible and 6 shorter ones so 12) and the rest have 7 (or actually 14)
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Not Mine: 2 INDYCAR EFR6758 turbos 0 each-1075823350_izip2-m.jpg  
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Old 10-15-2014, 12:32 AM   #9
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Quote:
Originally Posted by Savington View Post
No integrated BOV either.
you could probably just swap over the compressor housing
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