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Old 08-07-2002, 02:34   #1 (permalink)
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?????????? 17 x 8

I just put a set of simmons fr17 x 8 with 235 45 series tyres.

i dont need a speedo recalibration do I???
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Old 08-07-2002, 04:27   #2 (permalink)
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Unless your car came from the Ford factory with 235-45-R17's, then it is a very safe assumption that the speedo will be out !

If you want to find out just how much it is out by, check out
http://www4.tpgi.com.au/users/mij/Au...peedoCalc.html

(I dont know exactly what profile wheels your car came with standard, so I couldnt check myself)

Luckily though, in terms of diameter, it doesnt look like there is too much of a change from 205-65-R15. (-0.65%)
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Old 08-07-2002, 04:31   #3 (permalink)
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thanks for that... bloody useful

well my speedo is out bu half a kilometer

doesnt mater
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Old 08-16-2002, 07:39   #4 (permalink)
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Yeah, i strapped a set of 17 inch Tickford wheels to my car, and it didnt take me long to realise my speedo was out slightly due to the larger size... still, the engine runs at a lower rpm for the same cruising speed on the highway, slightly better fuel economy for long trips, slightly worse around town - but hey, they look good, so who cares *grins*
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Old 08-16-2002, 09:37   #5 (permalink)
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Speedo percentage error for 15" from standard 14" in my case should be under 3%. Mine seems more than that? My speedo must really be stuffed because on the dyno when the needle was on 200, the actual reading was 186km. That's more like 7% speedo error.
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Old 08-16-2002, 21:06   #6 (permalink)
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if your lowered i suggest getting your front guards lipped/rolled otherwise you will encounter problems later on..

trust me lol
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Old 08-16-2002, 21:14   #7 (permalink)
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Quote:
Originally posted by ON_iCE
Speedo percentage error for 15" from standard 14" in my case should be under 3%. Mine seems more than that? My speedo must really be stuffed because on the dyno when the needle was on 200, the actual reading was 186km. That's more like 7% speedo error.
I think youll find that all cars on the road, their speedos are out by up to 10% from the factory.
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Old 08-16-2002, 21:31   #8 (permalink)
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If you live in the Sydney area Brad Garlick Ford at Ryde sell transducers that when fitted compensates for speedo error for tyres and especially diff ratios that have been changed.
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Old 08-19-2002, 03:23   #9 (permalink)
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there is no real need to get the guards lipped if you have a nice stiff suspension set up. my car went down 3 inches and i can take any corner fast and with braking and have no problems. oh yeah and pic of my car with the simmons are coming tomorrow.
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Old 08-20-2002, 01:54   #10 (permalink)
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EB2Ghia - yeah, my suspension setup is nice and firm, no need for the guards to be rolled or lipped on my car either...

Have to love the handling on the car now, never had a Falcon handle so good, throw it into a corner and have the car follow thru all the way... makes me wonder what a V8Supercar would be like to drive...

Cheers
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