Firestorm Posted April 28, 2008 Share Posted April 28, 2008 First off, what to say a massive thank you to Steve R for helping me fit my Speedo Convertor and Top Speed Delimiter on Sat, he really is a Master at doing it, and it was good to hang out too. Got to have a ride in his Single turbo beast which is amazing! Thanks Steve!! on that note.. i think my Thor unit is off a little so will be ringing thor so they can help me figure how to adjust it.. so we come to the smart ppl on here .... figuring out the rolling radius- i have 18's on my tyre sizes are: Front:235/40 ZR 18/95 W Back:265/35 ZR 18/93 Y 36 psi pressure if i can figure out where im goin wrong i can +/- the speedo % to make it accurate. Cheers Guys. Quote Link to comment Share on other sites More sharing options...
SilverSoop Posted April 28, 2008 Share Posted April 28, 2008 First off, what to say a massive thank you to Steve R for helping me fit my Speedo Convertor and Top Speed Delimiter on Sat, he really is a Master at doing it, and it was good to hang out too. Got to have a ride in his Single turbo beast which is amazing! Thanks Steve!! on that note.. i think my Thor unit is off a little so will be ringing thor so they can help me figure how to adjust it.. so we come to the smart ppl on here .... figuring out the rolling radius- i have 18's on my tyre sizes are: Front:235/40 ZR 18/95 W Back:265/35 ZR 18/93 Y 36 psi pressure if i can figure out where im goin wrong i can +/- the speedo % to make it accurate. Cheers Guys. Wow, you keep your tyre pressure at quite a high psi.... I keep mine at 31 psi all round... Edit: The bigger your wheels are, the more rolling resistance you have, dont quote me on this but i think the speedo is out by 2.5 mph...but not quite sure how much. The van i use at work has 15in wheels on and just for example, its out by 5 mph as it has less rolling resistance... Quote Link to comment Share on other sites More sharing options...
Firestorm Posted April 28, 2008 Author Share Posted April 28, 2008 cool, cheers dude! Quote Link to comment Share on other sites More sharing options...
jamesmark Posted April 28, 2008 Share Posted April 28, 2008 Will this link help? http://www.kouki.co.uk/Utilities/tyresizer.asp Quote Link to comment Share on other sites More sharing options...
Firestorm Posted April 28, 2008 Author Share Posted April 28, 2008 oh dude that does help a shed load!! cheers dude!! now if only i new stock tyr size.. doh i think i need to check the spare lol Quote Link to comment Share on other sites More sharing options...
jamesmark Posted April 28, 2008 Share Posted April 28, 2008 235 45 17 255 40 17 Quote Link to comment Share on other sites More sharing options...
SteveR Posted April 28, 2008 Share Posted April 28, 2008 First off, what to say a massive thank you to Steve R for helping me fit my Speedo Convertor and Top Speed Delimiter on Sat, he really is a Master at doing it, and it was good to hang out too. Got to have a ride in his Single turbo beast which is amazing! Thanks Steve!! No probs Pete, you're more than welcome - glad I could be of assistance. on that note.. i think my Thor unit is off a little so will be ringing thor so they can help me figure how to adjust it.. If it over-reads now (and I thought it was a little optimistic when we went out to test the fit), it will have being doing before the conversion mate - it only applies a kph-mph conversion, after all. No biggie, we can correct the modified signal to match you wheel sizes... - when you find out from Thor, let me know how you do it and I'll add it ot the How To guide. now if only i new stock tyr size... Have a search chap, but I'm pretty sure the stock 16s are 225/50/16 and 245/50/16 (F/R). I know I suggested comparing the rolling radius, but on reflection I think a GPS check would be better - or a useful double-check if you do go with the radius comparison - because then you KNOW for sure what speed you're doing and can dial in/out the % discrepency on the Thor unit. If you don't know anyone with a GPS unit let me know next time you're passing and we can use mine; drive at a few set speeds on the GPS (say 30/50/70/x leptons) and write down what the speedo reads; it should be the same % out on each reading; hence easily corrected. Sorted Quote Link to comment Share on other sites More sharing options...
SteveR Posted April 28, 2008 Share Posted April 28, 2008 P.S. Hope the missis wasn't too annoyed you were missing all day - what time did you get back home? We did have to go out in mine and test I'd fitted my numberplate correctly, after all. Quote Link to comment Share on other sites More sharing options...
Firestorm Posted April 28, 2008 Author Share Posted April 28, 2008 P.S. Hope the missis wasn't too annoyed you were missing all day - what time did you get back home? We did have to go out in mine and test I'd fitted my numberplate correctly, after all. LOL oh we had to check that at speed the numberplate was fitted correctly i tottally agree. she was cool actually. got back at 8. so we more or less missed the paint it yourself pottery crap that we didnt wanna do LOL! so yeh she was v.happy. my dads gotta GPS but hes on holiday til next week. gonna ring thor in bout 5mins actually and find out. il txt u what u they say. yeh mite have to sort out that gps/ radius stuff etc. def do another day of fixin was well good. but well do a bit more on yours lol! Quote Link to comment Share on other sites More sharing options...
SilverSoop Posted April 29, 2008 Share Posted April 29, 2008 cool, cheers dude! No probs mate. Quote Link to comment Share on other sites More sharing options...
Firestorm Posted April 29, 2008 Author Share Posted April 29, 2008 Spoke to Thor yesterday about adjusting.. they suggest doing some testing with GPS and see how far i am out and then adjust the unit accordingly (flat head screwdriver) however up to 5mph out u just need to reset the needle on the dash. so hopefully i can get that sorted now! ] Steve will add to his how to guide i think. Quote Link to comment Share on other sites More sharing options...
SteveR Posted April 29, 2008 Share Posted April 29, 2008 Spoke to Thor yesterday about adjusting.. they suggest doing some testing with GPS and see how far i am out and then adjust the unit accordingly (flat head screwdriver) however up to 5mph out u just need to reset the needle on the dash. so hopefully i can get that sorted now! ] Steve will add to his how to guide i think. When you open the unit up to adjust, will you take a photo of the insides please mate? Just to be clear... If you adjust the speedo needle that will correct a fixed mph innacuracy (e.g. the speedo is always a fixed #mph out - unlikely). However what yours is (almost definitely) doing is over-reading because you have different rolling-radius tyres fitted, so it'll always be out by a fixed %. That's corrected using the adjustor inside the Thor unit. You just need to get a few GPS Vs Speedo readings at different speeds to see what that % is. Quote Link to comment Share on other sites More sharing options...
Firestorm Posted April 29, 2008 Author Share Posted April 29, 2008 When you open the unit up to adjust, will you take a photo of the insides please mate? Just to be clear... If you adjust the speedo needle that will correct a fixed mph innacuracy (e.g. the speedo is always a fixed #mph out - unlikely). However what yours is (almost definitely) doing is over-reading because you have different rolling-radius tyres fitted, so it'll always be out by a fixed %. That's corrected using the adjustor inside the Thor unit. You just need to get a few GPS Vs Speedo readings at different speeds to see what that % is. rite okay i understand now ! see mr steve= master amont men lol! Quote Link to comment Share on other sites More sharing options...
SteveR Posted April 29, 2008 Share Posted April 29, 2008 rite okay i understand now ! see mr steve= master amont men lol! nah I'm still a newbie learner compared to the knowledge some people on this site have. I need a bigger brain to take in some of the tech chat stuff. Quote Link to comment Share on other sites More sharing options...
bignum Posted April 29, 2008 Share Posted April 29, 2008 Working on other folkes cars, tut tut, you dont have time for that buddy, Quote Link to comment Share on other sites More sharing options...
SteveR Posted April 29, 2008 Share Posted April 29, 2008 Working on other folkes cars, tut tut, you dont have time for that buddy, I know I know.... Quote Link to comment Share on other sites More sharing options...
Firestorm Posted April 30, 2008 Author Share Posted April 30, 2008 hey hey hey!!! let the man help dammit! LOL! i appreciate- he wants to do it!! plus im special enuff to make time for LOL Quote Link to comment Share on other sites More sharing options...
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