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Old 05-17-2005, 04:13 PM   #1
krayge
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Default STi Cluster question...

ok, i have tried several searches, all of which turned up nothing. quickie question...when putting an STi cluster in a WRX, i noticed that the STi goes to 160 and WRX goes to 140. Does the STi cluster register the speed the same? ie...it actually displays the speed, not just a stepper motor showing 50% of the max speed?

so, as simply stated as can be...if the STi cluster shows me doin 80 (which is 50% of the speedo, roughly) am i ACTUALLY doing 80 or am i doin the 70 the WRX cluster would normally show?

does this make sense?
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Old 05-17-2005, 04:25 PM   #2
2000 RSTi
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good question
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Old 05-17-2005, 04:50 PM   #3
mcowger
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It will read correctly. The signal sent to the cluster is a number of pulses per revolution of the axles, not a '50% of max' kind of thing. The cluster electronics themselves deal with the coversion of pulses per second to speed.

So, installing a STi cluster on a WRX will result in 80 MPH actually being 80 MPH (+/- the usual error due to tire size, etc), regardless of max speeds on the gauge.
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Old 05-18-2005, 10:42 AM   #4
krayge
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awesome...i went thru and did some timed tests on the speedo on the interstate. this is absolutely correct. everything seemed ok. i appreciate the info, none the less...feels good to officially know i'm actually doin the speed it shows :P
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Old 05-23-2005, 03:52 AM   #5
crashtest sonny
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lucky, i wish i had an sti cluster in my wrx.
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Old 05-25-2005, 05:27 PM   #6
samwY
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Quote:
Originally Posted by mcowger
It will read correctly. The signal sent to the cluster is a number of pulses per revolution of the axles, not a '50% of max' kind of thing. The cluster electronics themselves deal with the coversion of pulses per second to speed.

So, installing a STi cluster on a WRX will result in 80 MPH actually being 80 MPH (+/- the usual error due to tire size, etc), regardless of max speeds on the gauge.
No. I did a road test with my pal who has the STi cluster, and then I did a road test with another WRX to double-check. The STi cluster reads 5mph faster on a WRX.
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Old 05-25-2005, 11:09 PM   #7
smdandb2
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Quote:
Originally Posted by samwY
No. I did a road test with my pal who has the STi cluster, and then I did a road test with another WRX to double-check. The STi cluster reads 5mph faster on a WRX.
There could be a half a million different variables causing the slight difference.

All that matters is they are close enough!
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Old 05-25-2005, 11:19 PM   #8
mcowger
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Heh, tire pressure, tire tread, clutch wear, road condition are all easily enough to make a 5MPH difference.

Quote:
Originally Posted by samwY
No. I did a road test with my pal who has the STi cluster, and then I did a road test with another WRX to double-check. The STi cluster reads 5mph faster on a WRX.
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