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Speedo off by 10mph and jumping. #732115
January 21st 2018 8:50 pm
January 21st 2018 8:50 pm
Joined: Sep 2015
Posts: 83
So-Cal
C
chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
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Joined: Sep 2015
Posts: 83
So-Cal
1987 G20 305. So my speedo is reading 10mph faster and is bouncing up and down. Please help. Thanks.

Last edited by chevydude1987; January 22nd 2018 2:11 am.
Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732116
January 21st 2018 9:48 pm
January 21st 2018 9:48 pm
Joined: Sep 2015
Posts: 83
So-Cal
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chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
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Joined: Sep 2015
Posts: 83
So-Cal
Oh ya, if it helps any, running stock size tires.

Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732142
January 22nd 2018 12:18 pm
January 22nd 2018 12:18 pm
Joined: Nov 2013
Posts: 878
West Texas
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Wedgy Offline
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Wedgy  Offline
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Joined: Nov 2013
Posts: 878
West Texas
It sounds like a similar problem frscke has in his G30 speedos.

I'll check my FS books, but both of his bounce around wildly fully pegged at WOT...

Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732143
January 22nd 2018 12:40 pm
January 22nd 2018 12:40 pm
Joined: Jun 2010
Posts: 13,125
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 13,125
Van Diego California
My speedo dont bounce, it was my oil gauge.


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Speedo off by 10mph and jumping. [Re: Wedgy] #732147
January 22nd 2018 1:22 pm
January 22nd 2018 1:22 pm
Joined: Sep 2015
Posts: 83
So-Cal
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chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
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Joined: Sep 2015
Posts: 83
So-Cal
Originally Posted by Wedgy
It sounds like a similar problem frscke has in his G30 speedos.

I'll check my FS books, but both of his bounce around wildly fully pegged at WOT...

If your FS books give you any ideas, please let me know. Thanks

Re: Speedo off by 10mph and jumping. [Re: frscke1] #732148
January 22nd 2018 1:23 pm
January 22nd 2018 1:23 pm
Joined: Sep 2015
Posts: 83
So-Cal
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chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
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Joined: Sep 2015
Posts: 83
So-Cal
Originally Posted by frscke1
My speedo dont bounce, it was my oil gauge.


Did you figure out the problem??

Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732149
January 22nd 2018 1:51 pm
January 22nd 2018 1:51 pm
Joined: Jun 2010
Posts: 13,125
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 13,125
Van Diego California
Stopped driving 120 mph ....lol

Yes my speedo did bounce cause it went all the way around and was bouncing off the bottom side of the zero pin .


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732151
January 22nd 2018 3:00 pm
January 22nd 2018 3:00 pm
Joined: Sep 2015
Posts: 83
So-Cal
C
chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
journeyman
C
Joined: Sep 2015
Posts: 83
So-Cal
Lol. That must of been fun. You probably put the sports cars you passed to shame. You should take your 454 to the street legal drags. Maybe hustle some youngens. For the fun of it, add a spoiler and a front air dam for some down force.

Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732152
January 22nd 2018 3:36 pm
January 22nd 2018 3:36 pm
Joined: Jun 2010
Posts: 13,125
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 13,125
Van Diego California
On the way back from TX I raced a mustang for 80 miles .... he couldnt get around me. We were well over 100 mph

My '92 ran against a Mustang on a 1/8 mile at Barrona .... OH HE WAS pissed gettin beat by a van ....lol

If you cant tell I like racin Mustangs .....

Last edited by frscke1; January 22nd 2018 3:49 pm.

SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Speedo off by 10mph and jumping. [Re: chevydude1987] #732166
January 22nd 2018 8:04 pm
January 22nd 2018 8:04 pm
Joined: Jan 2001
Posts: 1,943
Kellettville, PA
M
Meanmachine Offline
veteran
Meanmachine  Offline
veteran
M
Joined: Jan 2001
Posts: 1,943
Kellettville, PA
Take the speedo cable off and clean and lubricate.

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