Not Mine: 2 INDYCAR EFR6758 turbos $450 each
10-14-2014, 08:48 AM
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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/
https://www.facebook.com/groups/2462...0436810751945/
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10-14-2014, 01:37 PM
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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.
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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10-14-2014, 11:31 PM
#8
Yep its the same ebay ad and is from the same seller in Indiana. Its legit
http://www.full-race.com/articles/efrturbotechbrief.pdf
page 67
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)
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.
page 67
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:
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:
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