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 Speedo Recal--Is my understanding correct?
#438652
04/21/04 02:22 AM
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Joined: Jul 2003
Posts: 100
OP
Wheeler
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OK, Checked the archives came up with this: I upgraded my tires from stock 245/70X16 to 255/85X16. This equates to about a 12% speed correction e.g. speedo reads 70 mph, acutal is 78.4 mph. I have 19 tooth count on a 6-18 gear. To get back to a normal reading I need to drop two teeth, i.e., 17 teeth. BUT, (here is the rub) I can only drop 1 tooth. Is this correct? <img src="/forums/images/graemlins/frown.gif" alt="" />
Sadly I had to get rid of my 1996 Trooper 3.2L due to a rusted frame.
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 Re: Speedo Recal--Is my understanding correct?
[Re: FinnTrooper]
#438653
04/21/04 02:38 AM
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Joined: Oct 2003
Posts: 1,318
Body Damage is Cool
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Bro, your math sounds about right, but I usually have a tranny shop do this, it usuall cast anywhere bewteen 50 and 100 bucks...I neevr play with that stuff...
Chase
Chase
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Re: Speedo Recal--Is my understanding correct?
[Re: chasespeed]
#438654
04/21/04 04:10 AM
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Joined: Sep 2003
Posts: 312
Mudrunner
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Finn, just get one of those speedo-correction things, you can buy them at most offroad stores... if I could only remember the name of it <img src="/forums/images/graemlins/angry.gif" alt="" /> it'll come to me, soon enough <img src="/forums/images/graemlins/confused.gif" alt="" /> Edit: 2 min later <img src="/forums/images/graemlins/smile.gif" alt="" /> .... click here Santi
Last edited by LSGA; 04/21/04 04:12 AM.
1996 Isuzu Trooper LS, 33" BFG KMs, ARB Bullbar, OME 919's + 2.5" Daystar Spacers, RS5000's (Nissan Patrol's in the rear), DOR Bumpstops, K&N cone, Aisin manuals, factory LSD. oh, and a ton of N.E. rust <img src="/forums/images/graemlins/smile.gif" alt="" />
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Re: Speedo Recal--Is my understanding correct?
[Re: LSGA]
#438655
04/21/04 04:36 AM
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Anonymous
Unregistered
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How the heck do you figure that out?
I would like to figure it out on mine. Im sure there is quite a bit of difference LOL
OH And, since we are on this. You put bigger tires on. It makes your speedometer read SLOWER right? Your actually going faster than what it says? I mean, I know he just said that basically, but I want to be double sure LOL
Virginia
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Re: Speedo Recal--Is my understanding correct?
[Re: LSGA]
#438656
04/21/04 04:45 AM
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Joined: Aug 2002
Posts: 3,007
Roll Me Over
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Sorry, but that won't work on ours. Ours are cable driven and not electronic so that won't be able to help us. Would be nice though.
Richard
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Re: Speedo Recal--Is my understanding correct?
#438657
04/21/04 04:45 AM
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Joined: Oct 2003
Posts: 1,318
Body Damage is Cool
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Chase
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Re: Speedo Recal--Is my understanding correct?
[Re: chasespeed]
#438658
04/21/04 04:50 AM
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Anonymous
Unregistered
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Well damn LOL Doesnt that just figure. Oh well. It would be nice, but Im not worried. I havent been pulled over yet, and I cruise 70-75 on the freeway alllll the time LOL If it happens, maybe Ill pull a dumb girl thing <img src="/forums/images/graemlins/wink.gif" alt="" /> Ok j/k! LOL
Virginia
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Re: Speedo Recal--Is my understanding correct?
#438659
04/21/04 04:53 AM
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Joined: Sep 2003
Posts: 312
Mudrunner
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Yo Finn, could you post a pic of your trooper (i'm eventually getting 255x85's, just want an idea what they look like)
Thanks,
santi
1996 Isuzu Trooper LS, 33" BFG KMs, ARB Bullbar, OME 919's + 2.5" Daystar Spacers, RS5000's (Nissan Patrol's in the rear), DOR Bumpstops, K&N cone, Aisin manuals, factory LSD. oh, and a ton of N.E. rust <img src="/forums/images/graemlins/smile.gif" alt="" />
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Re: Speedo Recal--Is my understanding correct?
[Re: LSGA]
#438660
04/21/04 04:55 AM
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Joined: Jul 2003
Posts: 100
OP
Wheeler
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Finn, just get one of those speedo-correction things, you can buy them at most offroad stores... if I could only remember the name of it <img src="/forums/images/graemlins/angry.gif" alt="" /> it'll come to me, soon enough <img src="/forums/images/graemlins/confused.gif" alt="" /> Edit: 2 min later <img src="/forums/images/graemlins/smile.gif" alt="" /> .... click here Santi Santi, So where do I put this electronic device?
Sadly I had to get rid of my 1996 Trooper 3.2L due to a rusted frame.
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Re: Speedo Recal--Is my understanding correct?
[Re: FinnTrooper]
#438661
04/21/04 05:01 AM
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Joined: Aug 2002
Posts: 3,007
Roll Me Over
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It won't work. That is only for electronic speedometers. Yours is driven off a cable. There's no way it will work. The only way to compensate for it is to change the speedometer gears. Or, do like I do and use a GPS for your speedometer.
Richard
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