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10-04-2013, 03:41 PM
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FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Wollongong
Posts: 3,115
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anyone else noticed a loss of torque after fitting 205/40r17 tyres to a CL or LX Fiesta?
mine feels similar around town but on the highway and up long hills i have to chop back more eg: a hill i travel on everyday i could do 4th gear 105km/h and i could get to 110km/h now i was losing speed and by the top i was lucky to be doing 100km/h flatout. the tyres are only 2% taller so I would have though it would make no difference I was going to do a hill climb in it with the new wheels and tyres but i might put the stock conti's back on for it if i do track it ever i might just get 2 15in mags with 205/50r15 or 195/50r15 semi slicks for the front and leave the 17's on the back
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CURRENT RIDES BA GT Mk1 #0009 - Narooma Blue SY Ghia AWD Black VZ LX8 Adventra Holden HX 50th Anniversary AU Saloon Car racecar 1980 GS1000ST - Wes Cooley Rep
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10-04-2013, 04:37 PM
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Regular Member
Join Date: Mar 2011
Posts: 204
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you sure it's slower or your speedo is out?
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10-04-2013, 04:43 PM
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FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
 
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bigger rims an/or heavier rims will make the car slower to accelerate
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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10-04-2013, 05:26 PM
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FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Wollongong
Posts: 3,115
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it loses speed where it used to gain speed. so nothing to do with speedo reading lower. rims are no heavier than the stockies, but the tyres are cheapies so probably more rolling resistance than the stock continentals?
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CURRENT RIDES BA GT Mk1 #0009 - Narooma Blue SY Ghia AWD Black VZ LX8 Adventra Holden HX 50th Anniversary AU Saloon Car racecar 1980 GS1000ST - Wes Cooley Rep
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10-04-2013, 05:52 PM
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#5 | ||
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Thailand Specials
Join Date: Aug 2009
Location: Centrefold Lounge
Posts: 49,652
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Maybe its geared the car differently due to size difference.
Is your 2% figure taking into account the overall rolling diameter of the tyres? |
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10-04-2013, 06:07 PM
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#6 | ||
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FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Wollongong
Posts: 3,115
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yeah dia is now about 595mm and stock 584mm so 1.9% approx.
so at the same rpm i'm going 2% faster i wouldn't have though 2% would have made any diference really
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CURRENT RIDES BA GT Mk1 #0009 - Narooma Blue SY Ghia AWD Black VZ LX8 Adventra Holden HX 50th Anniversary AU Saloon Car racecar 1980 GS1000ST - Wes Cooley Rep
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10-04-2013, 06:15 PM
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#7 | ||
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FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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what size rims were on it standard?
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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10-04-2013, 06:58 PM
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#8 | |||
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FF.Com.Au Hardcore
Join Date: Oct 2010
Location: W.A.
Posts: 1,713
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Quote:
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His: 2019 Ford Focus SA Trend with Driver Assist Pack: 1.5 Ecoboost 3-cylinder (yes, 3 cylinders!), 8-speed automatic in Ruby Red.  Hers: 2020 Ford Puma JK: 1.0 Ecoboost 3-cylinder, 7-speed DCT in Frozen White. |
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10-04-2013, 07:29 PM
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#9 | ||
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FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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a 17" rim, even the same weight as a 15" rim will acclerate slower because there is more weight further from the axis, taller tyres will also make it accelerate slower
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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10-04-2013, 08:34 PM
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#10 | ||
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Audiophile
Join Date: Feb 2010
Posts: 359
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I didn't notice any difference when I fitted my 17's but that was a few years ago and i put the same conti's on it.
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WS Fiesta in Moondust Silver ~ G2 17's (205/40/17), 1700W Sony stereo, SOLD ZOOM ZOOM: 2009 Mazda 3 MPS (2nd gen) 256bhp through the front wheels... hello torque steer!!! 
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10-04-2013, 11:06 PM
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#11 | ||
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Where to next??
Join Date: Oct 2006
Location: Sydney
Posts: 8,893
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I went up a size with both the Festiva and the Focus and instantly felt a difference. I did it to drop the revs on the freeway and the Festiva had an uncommon size making it a little costly.
In both instances my Speedo went from being a little slow to being spot on. Take off was a little more sluggish but it spun a little slower on the freeway. After a month you will get used to it.
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___________________________ I've been around the world a couple of times or maybe more....... |
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slower with 17's on a WT Fiesta
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