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Hidden arrows on dashboard

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

jose456891
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jose456891

Hidden arrows on dashboard

Post by jose456891 » Fri Aug 18, 2017 10:59 am

The best modification I've done to my 850 wagon GLT is the addition of a trip computer from another 850. I easily get 30 miles to the gallon, or 540 miles to the tank. I drive alot for work, I sell life insurance and I've racked 3k miles in my most productive week.

Experimentally I've discovered that if I keep the tachometer shy of 3k I'll get the best economy even with the AC on. One night I was looking for coolant leaks by adding UV pigment to the coolant. I shined the light on the drivers area and noticed this on the dash:
20170817_212538.jpg
Left
20170817_212538.jpg (6.09 MiB) Viewed 827 times
20170817_212553.jpg
Right
20170817_212553.jpg (6.23 MiB) Viewed 827 times
Starting on the fuel Gage, the top arrows correspond to the exact full tank reading, and low it marks the reserve.

Temperature gauge has 3 sets of arrows. The top being a overheating condition, operating temp on the middle, and cold on the bottom. My car was right between the set of arrows rotating operating temp. The bottom arrow of that set is obscured by the gage itself.

The speedometer has 4 sets of arrows. When I keep the car within those arrows I always get 35+ MPG with the AC on.

The tachometer has 3 sets. I don't know what they mean, but if I needed to guess I'd say the first is idle target, last is the rev limiter and middle has to correspond with peak torque (this is where I get the best mpg.

I don't know if other models have these elusive UV arrows, or exactly what they mean. I'm here to share them with the community, hopefully you could try to drive within the arrows in the spedo and get high MPGs like I have.

-JG

jimmy57
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jimmy57

Re: Hidden arrows on dashboard

Post by jimmy57 » Fri Aug 18, 2017 11:16 am

Calibration markers for QC checks at gauge supplier.

jose456891
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jose456891

Re: Hidden arrows on dashboard

Post by jose456891 » Fri Aug 18, 2017 12:38 pm

jimmy57 wrote:
Fri Aug 18, 2017 11:16 am
Calibration markers for QC checks at gauge supplier.
Trust Me, I agree. But then why is the max torque stamped on teachometer. And the gear shift points on the spedo?

It's useful info for hypermiling.

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bmdubya1198
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bmdubya1198

Re: Hidden arrows on dashboard

Post by bmdubya1198 » Fri Aug 18, 2017 1:03 pm

That's really interesting. I'll have to get a UV light at some point and check out my cluster.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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abscate
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abscate

Re: Hidden arrows on dashboard

Post by abscate » Fri Aug 18, 2017 6:20 pm

Only if you know the history of what hasn't been done in your car
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ecbsykes
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Re: Hidden arrows on dashboard

Post by ecbsykes » Fri Aug 18, 2017 7:17 pm

abscate wrote:
Fri Aug 18, 2017 6:20 pm
Only if you know the history of what hasn't been done in your car
( ͡° ͜ʖ ͡°)
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bmdubya1198
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Re: Hidden arrows on dashboard

Post by bmdubya1198 » Sat Aug 19, 2017 7:29 am

abscate wrote:
Fri Aug 18, 2017 6:20 pm
Only if you know the history of what hasn't been done in your car
My car has had many owners before me. Maybe I'm better off not doing that...
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

jose456891
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jose456891

Re: Hidden arrows on dashboard

Post by jose456891 » Sat Aug 19, 2017 8:26 am

abscate wrote:
Fri Aug 18, 2017 6:20 pm
Only if you know the history of what hasn't been done in your car
I'll be willing to bet my entire yearly income that these arrows are on most volvo 850's independent of the number of owners.

It's highly plausible that v70's have this.

I also bet that the arrows on the speedometer correspond with gear shifts and the ones on tachometer correspond with idle, max torque, and rev limit.

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Clemens
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Clemens

Re: Hidden arrows on dashboard

Post by Clemens » Sat Aug 19, 2017 2:13 pm

They are not afraid of the arrows, jose, they are worried about traces of man-juice if you know what I mean. It becomes visible under UV light.

The arrows though are an interesting find. Very cool.
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abscate
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abscate

Re: Hidden arrows on dashboard

Post by abscate » Sun Aug 20, 2017 3:57 am

The Oxford dictionary

jimmy57....noun....knows more obscure and useful stuff about Volvos than Volvo themselves.

Simple test. In a given model year P80s came With three engine options of NA LPT and HPT. Is there a different part number DIM for each one to reflect the shift points ?
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