Home |  Forums |  Search |  My Profile |  Chat  Photo Gallery |  Events Calendar |  Technical Documents  No messages |  New Posts |  Watched Topics |  Register   WILL 20'S AFFECT MY DYNO READING Goto page 1, 2  Next          Forum Index -> Track Side Latest ratings Highest-ranked posts Highest-ranked topics Highest-ranked posters   ebxr82nv Fordmods Tyre Shredder Age:25 Posts: 340 Joined: 15 Mar 2007 Location: thornton NSW, Australia View User Gallery (1) Posted: Sun Feb 10, 2008 9:08 am    Post subject: WILL 20'S AFFECT MY DYNO READING just wondering if the 20's on my AU will change my read out on the dyno and will it go up or down? Back to top FordFairmont Fordmods - Getting Side Ways Posts: 3169 Joined: 08 May 2007 Location: Sunny QLD, Australia View User Gallery (1) Posted: Sun Feb 10, 2008 9:27 am    Post subject: yeah im keen on seeing if a few variables like that affect the reading. this might sound stupid but, what about removing the spare tyre and reducing weight for the dyno? If it gains accelaration on the street, then you would think it would work on the dyno? Some one wanna clarify how it works? Back to top cooki_monsta Fordmods - Getting Side Ways Age:22 Posts: 2356 Joined: 25 Sep 2005 Location: Upper FTG. melbourne VIC, Australia View User Gallery (9) Posted: Sun Feb 10, 2008 9:43 am    Post subject: imo your power @ wheels will go down slightly as your car is turning a larger wheel. will be down only by a few kw though. more extreme way of telling is with 4wd's run 31's n u have lots of power, change to 37's n ur car suddenly cant pull them! Back to top ebxr82nv Fordmods Tyre Shredder Age:25 Posts: 340 Joined: 15 Mar 2007 Location: thornton NSW, Australia View User Gallery (1) Posted: Sun Feb 10, 2008 11:27 am    Post subject: we shall see next weekend then at the dyno day ill post after that what it made Back to top Mr Man Fordmods - Getting Side Ways Age:23 Posts: 736 Joined: 09 May 2005 Location: Mildura VIC, Australia View User Gallery (0) Posted: Sun Feb 10, 2008 1:34 pm    Post subject: ebxr82nv wrote: just wondering if the 20's on my AU will change my read out on the dyno and will it go up or down? it shouldnt affect it much... some people reckon it does and people reckon it doesnt... you would get more variation in power output by different weather conditions compared to the last time it was on the rollers.. FordFairmont wrote: yeah im keen on seeing if a few variables like that affect the reading. this might sound stupid but, what about removing the spare tyre and reducing weight for the dyno? If it gains accelaration on the street, then you would think it would work on the dyno? Some one wanna clarify how it works? removing spare tyre wont increase power output... it may improve acceleration due to it being lighter, that would increase your power:weight ratio, not power output.. although the weight of the spare wheel compared to the whole car wont make much difference... cooki_monsta wrote: imo your power @ wheels will go down slightly as your car is turning a larger wheel. will be down only by a few kw though. i had a mate in a BA XR6T who had 305rwkw with his 17s, people were telling him with his new 19s he would have less power, so he took it to his tuner and dynoed it with the 19s on there and it made 305rwkw again.. it could depend on the weight of the actual wheel if it heavier or lighter than the standard items. imo i dont believe it will change it much, a few kw would be all... ebxr82nv wrote: we shall see next weekend then at the dyno day ill post after that what it made is it going on the same dyno as it did for the reading u r comparing it to?? remember that different abient temp and things like that can affect the power output on the day... sorry for the long post. i am interested to see your results ebxr82nv. cheers. Back to top TROYMAN Technical Contributor Age:34 Posts: 2664 Joined: 07 Nov 2004 Location: South Western Sydney NSW, Australia View User Gallery (29) Posted: Sun Feb 10, 2008 1:50 pm    Post subject: changing wheel size will be similar to changing your diff ratio. i guess thats the same question as does your diff ratio affect the rwkw?? thats something im also curious about?????? Back to top ebxr82nv Fordmods Tyre Shredder Age:25 Posts: 340 Joined: 15 Mar 2007 Location: thornton NSW, Australia View User Gallery (1) Posted: Sun Feb 10, 2008 3:18 pm    Post subject: no it will be a different dyno. the 136kw run was done on a day with an air temp of 45 in the shed Back to top BigCav Fordmods Parts Gopher Age:22 Posts: 51 Joined: 12 Nov 2004 Location: broadford VIC, Australia View User Gallery (0) Posted: Mon Feb 11, 2008 1:50 am    Post subject: the only effect changing wheels will have power wise would be a tiny drop if the wheels are effectivly harder to turn because they are heavier or something if they are only bigger it wont affect your power output, same with different diff gears or the popular myth of running your car in a lower gear for more power the power at the rears will always be the same however tractive effort will change, this is the force in newtons that the wheels are putting onto the rollers. imagine taking off in top gear, it would be slow as hell right, thats because tractive effort would be low, so when u have larger wheels or change anything that effects your lever arm or mechanical advantage will change the tractive effort really wont mean anything unless your using the tractive effort to find your rwnm so in summary power output will only be affected because your wheel may be heavier etc, if the wheels lighter it may actuall give u more power, Back to top 4dlvr Fordmods - Getting Side Ways Age:19 Posts: 1092 Joined: 04 May 2006 Location: melbourne VIC, Australia View User Gallery (4) Posted: Mon Feb 11, 2008 5:12 pm    Post subject: according to my physics teacher the torque curve will drop but the peak kw number should slightly increase Back to top fordfreak ef Cruise Moderator Age:25 Posts: 8517 Joined: 17 Apr 2005 Location: ya mums bed! lol NSW, Australia View User Gallery (31) Posted: Mon Feb 11, 2008 6:05 pm    Post subject: 4dlvr wrote: according to my physics teacher the torque curve will drop but the peak kw number should slightly increase lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... Back to top FordFairmont Fordmods - Getting Side Ways Posts: 3169 Joined: 08 May 2007 Location: Sunny QLD, Australia View User Gallery (1) Posted: Mon Feb 11, 2008 6:10 pm    Post subject: fordfreak ef wrote: lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... i would fit some stockies on for the comp. Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's and would affect intertia you would think Back to top 4dlvr Fordmods - Getting Side Ways Age:19 Posts: 1092 Joined: 04 May 2006 Location: melbourne VIC, Australia View User Gallery (4) Posted: Mon Feb 11, 2008 6:13 pm    Post subject: ill say something we already no. the torque curve matters much then more then peak power in a drag race. so even though the higher number will make you think you've got the bigger d**k the better torque curve will prove you've got the bigger balls Back to top ebxr82nv Fordmods Tyre Shredder Age:25 Posts: 340 Joined: 15 Mar 2007 Location: thornton NSW, Australia View User Gallery (1) Posted: Tue Feb 12, 2008 7:59 am    Post subject: FordFairmont wrote: fordfreak ef wrote: lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... i would fit some stockies on for the comp. Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's and would affect intertia you would think Ahh weres the fun in that ! Back to top fordfreak ef Cruise Moderator Age:25 Posts: 8517 Joined: 17 Apr 2005 Location: ya mums bed! lol NSW, Australia View User Gallery (31) Posted: Tue Feb 12, 2008 8:11 am    Post subject: FordFairmont wrote: fordfreak ef wrote: lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... i would fit some stockies on for the comp. Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's and would affect intertia you would think but makes you look like another try hard commo wanker... so i will be turning up to the comp on full 20's.. but MAY chanfe to a set of low profile 14s ive had in starage for ages.. kinda cheating though considering i never drive on 14's so in effect wouldnt thAT also be trying to "make ur d**k look bigger"?? Back to top FordFairmont Fordmods - Getting Side Ways Posts: 3169 Joined: 08 May 2007 Location: Sunny QLD, Australia View User Gallery (1) Posted: Tue Feb 12, 2008 8:50 am    Post subject: i personally would use the multi-directional wheels from a shopping trolley for the 'edge' in the dyno comp Back to top mr_sperm1 Cruise Moderator Age:21 Posts: 2538 Joined: 28 Jun 2005 Location: Hobart TAS, Australia View User Gallery (13) Posted: Tue Feb 12, 2008 8:56 am    Post subject: fordfreak ef wrote: FordFairmont wrote: fordfreak ef wrote: lets hope thats right as ive now 20's and up for my 1st dyno comp with them installed this weekend coming... i would fit some stockies on for the comp. Theres prolly around 10 kg difference in weight between your 20" rims/tyres and a stockie with 195's and would affect intertia you would think but makes you look like another try hard commo wanker... so i will be turning up to the comp on full 20's.. but MAY chanfe to a set of low profile 14s ive had in starage for ages.. kinda cheating though considering i never drive on 14's so in effect wouldnt thAT also be trying to "make ur d**k look bigger"?? considering 15's were stock on EF's, not 14's Back to top 66 coupe Fordmods - Getting Side Ways Age:29 Posts: 781 Joined: 05 Nov 2004 Location: Perth WA, Australia View User Gallery (0) Posted: Tue Feb 12, 2008 10:42 am    Post subject: dyno comps... put it on the track, thats where the real numbers are Back to top sickd Fordmods - Getting Side Ways Age:25 Posts: 604 Joined: 11 Nov 2004 Location: Melbourne VIC, Australia View User Gallery (8) Posted: Tue Feb 12, 2008 2:59 pm    Post subject: it cant affect it they put info into the dyno wheel diameter and stuff otherwise eveyone would run 13' stockies cos they would get more kws Back to top ebxr82nv Fordmods Tyre Shredder Age:25 Posts: 340 Joined: 15 Mar 2007 Location: thornton NSW, Australia View User Gallery (1) Posted: Tue Feb 12, 2008 3:34 pm    Post subject: depends how honest the operator is and i dont know if shoot out mode allows for this info Back to top sickd Fordmods - Getting Side Ways Age:25 Posts: 604 Joined: 11 Nov 2004 Location: Melbourne VIC, Australia View User Gallery (8) Posted: Tue Feb 12, 2008 6:21 pm    Post subject: ebxr82nv wrote: depends how honest the operator is and i dont know if shoot out mode allows for this info a true dyno allows for all these specs if you want a true reading you need it other wise the dyno read out is s**t and you pay for a lie Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First             Forum Index -> Track Side Goto page 1, 2  Next Page 1 of 2   (c)2002-2008 Matti Jones and Brad Evans [47 queries :: 0.07854 seconds ]