speedo correction

Submitted: Sunday, Feb 26, 2006 at 22:13
ThreadID: 31192 Views:1940 Replies:7 FollowUps:1
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We have a 2004 PRADO MANUAL which runs 265 x65 series tyres. We would like to fit B.F.Goodridge tyres but they only come in 70 series. Does anybody know if somebody makes a product, or if existing speedo drive can be modified to correct the speedo once the larger tyres have been fitted? any feedback would be great thankyou Ernie.
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Reply By: Member - Paul P (Bris) - Sunday, Feb 26, 2006 at 22:16

Sunday, Feb 26, 2006 at 22:16
Ernie

The profile change will not make a large difference in real speed. Have you had the the speedo accuracy checked with the current tyres. Most speedos (vehicle standard ex factory) read fast.

When you change tyres check the speedo accuracy (RACQ or GPS) so that you are aware of changes.

Regards

Paul
AnswerID: 157213

Reply By: STEVE069 - Sunday, Feb 26, 2006 at 22:19

Sunday, Feb 26, 2006 at 22:19
Hi Ernie, check out post No31166

Steve
AnswerID: 157214

Reply By: rustytruck - Sunday, Feb 26, 2006 at 22:36

Sunday, Feb 26, 2006 at 22:36
Ernie,
Marks Four Wheel Drive Adaptors had one advertised. Check out the magazines for an address. They also have a web site.

Rusty
AnswerID: 157216

Reply By: Member - Norm C (QLD) - Sunday, Feb 26, 2006 at 22:51

Sunday, Feb 26, 2006 at 22:51
Go to this site. Enter your standard tyre and proposed new tyre size, it will tell you the speedo change as a %.

http://www.miata.net/garage/tirecalc.html
AnswerID: 157223

Reply By: Member - Stan (VIC) - Sunday, Feb 26, 2006 at 23:09

Sunday, Feb 26, 2006 at 23:09
None that I know of work with 2004 Prado... You can use GPS if you are using
one in the car to check your speed, otherwise it will be off by about 5%

Someone currently trialing this one:

LINK
AnswerID: 157225

Follow Up By: Member - Stan (VIC) - Sunday, Feb 26, 2006 at 23:12

Sunday, Feb 26, 2006 at 23:12
http://www.eng-tek.com.au/product_info.php?cPath=53&products_id=127
0
FollowupID: 411486

Reply By: Sarg - Monday, Feb 27, 2006 at 00:04

Monday, Feb 27, 2006 at 00:04
Put some numbers into this & see for yourself :

http://www.osella.com.au/gear-ratios.htm
AnswerID: 157231

Reply By: TUFF IFS LUX - Tuesday, Feb 28, 2006 at 20:54

Tuesday, Feb 28, 2006 at 20:54
gday mate,

listen to rutsty previously, i gotta 2003 hilux and have fitted 265/75x16 and the speedo was out 9%. Rang marks adapters and got a variable ratio box that I installed and programmed meself for about $160-. an auto elec. had previosuly quoted me 320 bux and I was waiting for 2 months and nothing happend so I took matters into me own hands. Very easy to program and fit. the speedo pickup off the transfer case has three wires coming out of it- one of the wires (the left one if im correct) is the pickup. you cut this wire and the two wires coming off the variable ratio box connect to either side of the original wire so the unit becomes connected in series. there are two more wires which one is earth and the other is an accessory power connection. you can program upto 2 different tyres sizes on the unit and swap at the flick of the switch.

Hoped it helped
AnswerID: 157622

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