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Speedo reports faster than actual speed


HadesOmega
Newbie
1373/2000


Galant VR-4 org Post #: 1234477 posted 12/28/16 03:01 AM     Remind Me!  Send Private Message   Edit Post      
My GVR4 reports +10mph higher than actual speed. I found it strange how my car says I'm going like 70mph and cars are passing me so I checked it with a GPS one day and found out it 10mph higher. Does anyone know the cause for this and is there a way I can adjust it like get a different speedo gear drive or something?



"Black Widow" 1991 Galant VR4 #1373/2000
1998 Mitsubishi Eclipse GST
1991 Toyota Previa 5-Speed
1989 Toyota MR2 Supercharged
1976 Datsun 280Z Turbo

Posts: 17 | From: San Jose, California | Member Since: 01/04/16 | IP: (50.148.189.125) | Report this post to a Moderator

thomcasey
I ain't no puny human
1025/2000


Galant VR-4 org Post #: 1234484 posted 12/28/16 09:16 AM     Remind Me!  Send Private Message   Edit Post      
Whats your wheel/tire combo measurements?



Thom
1991 GVR-4 1025/2000 (PTE 1200's, 16g, DSMLink v3, gm-maf, eagle/ross, .020 over, 272's)

Posts: 647 | From: Indianapolis, IN | Member Since: 09/24/14 | IP: (12.109.79.254) | Report this post to a Moderator

HadesOmega
Newbie
1373/2000


Galant VR-4 org Post #: 1234500 posted 12/29/16 08:00 AM     Remind Me!  Send Private Message   Edit Post      
Ahh I forgot about the tire size

It has EVO8 wheels with 245/40/17s

I put in the sizes with the stock 195/60/15s in the tire calculator and it says they're the same size though maybe reports 1mph faster.

Maybe if I change to a taller profile tire like a 45 it will read closer to what it should be but it'll probably be off by +5 still.



"Black Widow" 1991 Galant VR4 #1373/2000
1998 Mitsubishi Eclipse GST
1991 Toyota Previa 5-Speed
1989 Toyota MR2 Supercharged
1976 Datsun 280Z Turbo

Posts: 17 | From: San Jose, California | Member Since: 01/04/16 | IP: (50.148.189.125) | Report this post to a Moderator

iceman69510
Turn Right Racing
855/2000
828/1000


Galant VR-4 org Post #: 1234505 posted 12/29/16 11:11 AM     Remind Me!  Send Private Message   Edit Post      
1g trans and speedo gear maybe? They are different (though I am not at this point thinking about which way).



91 VR4 855 Nile Black
92 VR4 828 Belize Green-Daily driver status
91 VR4 115 Nile Black -SOLD

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HadesOmega
Newbie
1373/2000


Galant VR-4 org Post #: 1234530 posted 12/30/16 10:20 AM     Remind Me!  Send Private Message   Edit Post      
Hmm that maybe the problem are the GVR4 and 1G DSM speedo gears interchangeable?



"Black Widow" 1991 Galant VR4 #1373/2000
1998 Mitsubishi Eclipse GST
1991 Toyota Previa 5-Speed
1989 Toyota MR2 Supercharged
1976 Datsun 280Z Turbo

Posts: 17 | From: San Jose, California | Member Since: 01/04/16 | IP: (50.148.189.125) | Report this post to a Moderator

iceman69510
Turn Right Racing
855/2000
828/1000


Galant VR-4 org Post #: 1234549 posted 12/31/16 10:42 AM     Remind Me!  Send Private Message   Edit Post      
Yes, IIRC they are one tooth different maybe. I put the 1g in my car because I have 225 45-17 tires on, and they are closer to the rolling diameter of the 1g with 16" wheels than the stock VR4 diameter.



91 VR4 855 Nile Black
92 VR4 828 Belize Green-Daily driver status
91 VR4 115 Nile Black -SOLD

Posts: 10403 | From: Michigan | Member Since: 03/05/01 | IP: (2602:304:ccc7:35) | Report this post to a Moderator

HadesOmega
Newbie
1373/2000


Galant VR-4 org Post #: 1234571 posted 01/02/17 06:27 AM     Remind Me!  Send Private Message   Edit Post      
Cool I guess the search for a 1G Speedo gear drive begins thanks =)



"Black Widow" 1991 Galant VR4 #1373/2000
1998 Mitsubishi Eclipse GST
1991 Toyota Previa 5-Speed
1989 Toyota MR2 Supercharged
1976 Datsun 280Z Turbo

Posts: 17 | From: San Jose, California | Member Since: 01/04/16 | IP: (50.148.189.125) | Report this post to a Moderator

FlyingEagle
Doesn't Match Anything


Galant VR-4 org Post #: 1234578 posted 01/02/17 09:34 AM     Remind Me!  Send Private Message   Edit Post      
I looked up a 4wd D27A model and the speedo gear (driven) in the trans case top, is MD728826.

JnzTuning.com shows just over $21 US if they can get the part. The part listed N=29 which has to be the tooth count.

The same gear in the Gvr4 is MD728827, and listed as N=30, so 30 tooth count.

As Ice suspected, it is a single tooth count difference. Same price.



C53A 1 of the ~1500

Posts: 1494 | From: THE Ottawa | Member Since: 03/05/05 | IP: (99.224.205.238) | Report this post to a Moderator

strokin4dr
fighting them with a large needle
1280/2000
1135/2000


Galant VR-4 org Post #: 1234595 posted 01/02/17 08:05 PM     Remind Me!  Send Private Message   Edit Post      
Good info here!



Ryan C.
1908- sold and missed.
1280- 2.3, FP 35R, E85, etc.
1135- 100% stock - 88k miles
'93 Mirage hatch- 4g63, AWD, etc (hoarding for build)

Posts: 2666 | From: Savannah, GA | Member Since: 08/30/05 | IP: (73.21.58.201) | Report this post to a Moderator

HadesOmega
Newbie
1373/2000


Galant VR-4 org Post #: 1238912 posted 08/06/17 08:07 AM     Remind Me!  Send Private Message   Edit Post      
Just a followup to this topic. I finally got around to installing A gvr4 speedo gear that I got. When I took the current one out it had a 29tooth gear and the gvr4 one I had had a 30tooth gear. Swapped them out and now my speedo is off by +12 now so it made it worse. I guess I should have figured since the teeth went +1 it would spin slower.

Anyway I noticed my speedo needle settles on the 15mph mark. Is this normal? Maybe I should open it up and move the needle to the 5mph mark.



"Black Widow" 1991 Galant VR4 #1373/2000
1998 Mitsubishi Eclipse GST
1991 Toyota Previa 5-Speed
1989 Toyota MR2 Supercharged
1976 Datsun 280Z Turbo


Edited by HadesOmega (08/06/17 04:00 PM)

Posts: 17 | From: San Jose, California | Member Since: 01/04/16 | IP: (67.188.137.56) | Report this post to a Moderator

FlyingEagle
Doesn't Match Anything


Galant VR-4 org Post #: 1238914 posted 08/06/17 08:51 AM     Remind Me!  Send Private Message   Edit Post      
Never seen a speedo that doesn't sit at the needle when it should be at rest, unless something is amiss or someone had the gauge face/needle off for some reason and they goofed at reinstalling the needle. The needle should sit lower at rest as it only moves up when the reed switch is activated and the cable in the back of the cluster is actually spinning.



C53A 1 of the ~1500


Edited by FlyingEagle (08/06/17 08:53 AM)

Posts: 1494 | From: THE Ottawa | Member Since: 03/05/05 | IP: (68.171.77.46) | Report this post to a Moderator

HadesOmega
Newbie
1373/2000


Galant VR-4 org Post #: 1238920 posted 08/06/17 04:01 PM     Remind Me!  Send Private Message   Edit Post   
Yeah the previous owners have been doing some goofy stuff to this car =(



"Black Widow" 1991 Galant VR4 #1373/2000
1998 Mitsubishi Eclipse GST
1991 Toyota Previa 5-Speed
1989 Toyota MR2 Supercharged
1976 Datsun 280Z Turbo

Posts: 17 | From: San Jose, California | Member Since: 01/04/16 | IP: (67.188.137.56) | Report this post to a Moderator


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