alenp Posted April 15, 2009 Share Posted April 15, 2009 Upravo to. Osim ako autu nekim čudom ne dodaš recimo 200-300kg mase autu... Onda će ti biti veća površina... BTW, sa 255/40-R18 ćeš puno spušiti jer će ti i brzine biti duže pa ćeš imati još lošije ubrzanje i međuubrzanje... Jednostavno ne kužim zašto bi netko išao staviti na 1300kg težak auto i 235 gumu, a kamoli 255! :rofl::doh: 1340 s rezervom i bez vozaca.. Kakvu gumu bi ti stavio na takav auto? Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 215 ili 225. 235 je već previše, a kamoli 255.. :doh: Link to comment Share on other sites More sharing options...
Mario_S3 Posted April 16, 2009 Share Posted April 16, 2009 Siguran sam da su inženjeri koji su napravili R26, koji ubija sve hothachove, trebali vas pitati u vezi odabira dimenzije gume jer - kaj oni znaju Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 Naravno. Zašto su stavili samo 235. Trebali su staviti 335 i onda bi auto još bolje išao... :doh: Pogledaj malo aute kroz povijest. Auto sličnih karakteristika i težine (calibra turbo) je imala 205/50-R16. Kako ideš od 92 druge do danas autima stalno raste felga, raste guma, spušta se profil. Dobiješ bigfootove. Zašto? Zato da gume budu skuplje, da više zarade... Nemoj precjenjivati inženjere, jer oni nemaju zadnju riječ. Zadnju riječ imaju naravno ekonomisti... Kako to znam? Tako jer je i meni ekonomist šef... :doh: Link to comment Share on other sites More sharing options...
Drag_steer Posted April 16, 2009 Share Posted April 16, 2009 sta nije ako je duzi krak da ga je teze za pokrenut , npr MLIN, ima onaj kotac, koji u sredini recimo ima osovinu, i teze je preko osovine vrtit mali kotac sa kracim lopaticama (krakovima) nego onaj s duzim. ne samo zato sto je veci obicno tezi nego je onda veca "anti poluga" Link to comment Share on other sites More sharing options...
fire Posted April 16, 2009 Author Share Posted April 16, 2009 sta nije ako je duzi krak da ga je teze za pokrenut , npr MLIN, ima onaj kotac, koji u sredini recimo ima osovinu, i teze je preko osovine vrtit mali kotac sa kracim lopaticama (krakovima) nego onaj s duzim. ne samo zato sto je veci obicno tezi nego je onda veca "anti poluga" tocno to i sila potreba za okretanje raste s kvadratom duljine kraka. Zato gumeni dio jace utjece nego felga. Link to comment Share on other sites More sharing options...
13snc Posted April 16, 2009 Share Posted April 16, 2009 Evo ako nekog zanima... uvik se poteze prica od tezini replika.. jucer sam starome zamjenio zimske i stavio ljetne pa iskoristio priliku da izvagam felge s gumama.. ove lakse su prednje 225 40 ZR 18, a teze su zadnje 255 35 ZR 18 continental sport contact 3 po meni to uopce nije nesto previse tesko... od Kreze audi replike isto 11kg.. Prx je uzeo Team Dynamics koje bi kao trebale bit lagane isto 11ak kg.. sama guma ne znam koliko tezi pa ne znam i pravu tezinu ovih gore M5 replika... Link to comment Share on other sites More sharing options...
Mario_S3 Posted April 16, 2009 Share Posted April 16, 2009 Continentalka je jako lagana, ima ti 10 kila u toj dimenziji, dakle felga ti prednja ima 12.3 kg Link to comment Share on other sites More sharing options...
maticCRO Posted April 16, 2009 Share Posted April 16, 2009 mrG jel bi i Lambo/Viper isao i lezao bolje da umjesto 335 sirine ima 255 gumu, ja da kupim takav auto odma bi stavio gume Sava 205 R 16 da budem sekundu brzi do 100kmh lool Link to comment Share on other sites More sharing options...
alenp Posted April 16, 2009 Share Posted April 16, 2009 Naravno. Zašto su stavili samo 235. Trebali su staviti 335 i onda bi auto još bolje išao... :doh: Pogledaj malo aute kroz povijest. Auto sličnih karakteristika i težine (calibra turbo) je imala 205/50-R16. Kako ideš od 92 druge do danas autima stalno raste felga, raste guma, spušta se profil. Dobiješ bigfootove. Zašto? Zato da gume budu skuplje, da više zarade... Nemoj precjenjivati inženjere, jer oni nemaju zadnju riječ. Zadnju riječ imaju naravno ekonomisti... Kako to znam? Tako jer je i meni ekonomist šef... :doh: Da je stvar stednje guma, nebi stavili Pilot sport 2 nego bi stavili Nakang NS2:thumbsup: Calibra nikad nije i nikad nece bit vozena kao R26, barem nece moc podnijet to u zavojima..a i ubrzanja s 0 su isto odlicna sa ovom gumom ( dimenzijom gume ) Jedna 235/40/18 ima index tezine 95 = 690 kg po gumi, naravno postoji i sa manjim indexom tezine ali su oni odlucili ocito stavit index 95.. Naravno probao sam vozit auto na 215/45/17, auto ne lezi, curi preko nosa, preko 180 sve sve trese.. I sad ono bitno, zasto bi me usporila 235 guma ako bi 215 imala slicnu gaznu povrsinu? Zbog tezine? Jer 235/40/18 sa stock felgom ima 21.5 kg Link to comment Share on other sites More sharing options...
fire Posted April 16, 2009 Author Share Posted April 16, 2009 mrG jel bi i Lambo/Viper isao i lezao bolje da umjesto 335 sirine ima 255 gumu, ja da kupim takav auto odma bi stavio gume Sava 205 R 16 da budem sekundu brzi do 100kmh lool Neznam dali neznas engleski ili si ljen citati ili ti je samo dosadno pa malo podjebavas. So do wider tyres give better grip? If the contact patch remains the same size and the coefficient of friction and frictional force remain the same, then surely there is no difference in performance between narrow and wide tyres? Well there is but it has a lot to do with heat transfer. With a narrow tyre, the contact patch takes up more of the circumference of the tyre so for any given rotation, the sidewall has to compress more to get the contact patch on to the road. Deforming the tyre creates heat. With a longer contact patch and more sidewall deformation, the tyre spends proportionately less time cooling off than a wider tyre which has a shorter contact patch and less sidewall deformation. Why does this matter? Well because the narrower tyre has less capacity for cooling off, it needs to be made of a harder rubber compound in order to better resist heating in the first place. The harder compound has less mechanical keying and a lower coefficient of friction. The wider tyres are typically made of softer compounds with greater mechanical keying and a higher coefficient of friction. And voila - wider tyres = better grip. But not for the reasons we all thought. Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 mrG jel bi i Lambo/Viper isao i lezao bolje da umjesto 335 sirine ima 255 gumu, ja da kupim takav auto odma bi stavio gume Sava 205 R 16 da budem sekundu brzi do 100kmh lool Viper ima preko 2 tone, kamionski moment i motor... I sad ono bitno, zasto bi me usporila 235 guma ako bi 215 imala slicnu gaznu povrsinu? Zbog tezine? Jer 235/40/18 sa stock felgom ima 21.5 kg Uža guma se obično veže uz manji otpor kotrljanja i manju potrošnju, veći top speed, bolja međuubrzanja... Ali na kraju se to sve svede na optimiziranje dimenzija, da bude dobra u svim uvjetima, a ne odlična u nečem, a loša u nečem drugom... Ja znam da se preširokom gumom puši na ubrzanju i međuubrzanju... Ostalo me i tako ne zanima.. :rofl: Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 Neznam dali neznas engleski ili si ljen citati ili ti je samo dosadno pa malo podjebavas.So do wider tyres give better grip? If the contact patch remains the same size and the coefficient of friction and frictional force remain the same, then surely there is no difference in performance between narrow and wide tyres? Well there is but it has a lot to do with heat transfer. With a narrow tyre, the contact patch takes up more of the circumference of the tyre so for any given rotation, the sidewall has to compress more to get the contact patch on to the road. Deforming the tyre creates heat. With a longer contact patch and more sidewall deformation, the tyre spends proportionately less time cooling off than a wider tyre which has a shorter contact patch and less sidewall deformation. Why does this matter? Well because the narrower tyre has less capacity for cooling off, it needs to be made of a harder rubber compound in order to better resist heating in the first place. The harder compound has less mechanical keying and a lower coefficient of friction. The wider tyres are typically made of softer compounds with greater mechanical keying and a higher coefficient of friction. And voila - wider tyres = better grip. But not for the reasons we all thought. Isto tako šire gume nižeg profila će moći postići veće brzine (veći index brzine). No ništa ne spominje otpor kotrljanja, potrošnju, max brzinu, itd... Na kraju se sve svede na početni proračun, pa isprobavanje... :rofl: Link to comment Share on other sites More sharing options...
fire Posted April 16, 2009 Author Share Posted April 16, 2009 Spominje, ja sam pastao jedan dio linka da bude bolje uociljivo. Link to comment Share on other sites More sharing options...
Lepi Posted April 16, 2009 Share Posted April 16, 2009 (edited) Neznam dali neznas engleski ili si ljen citati ili ti je samo dosadno pa malo podjebavas.So do wider tyres give better grip? If the contact patch remains the same size and the coefficient of friction and frictional force remain the same, then surely there is no difference in performance between narrow and wide tyres? Well there is but it has a lot to do with heat transfer. With a narrow tyre, the contact patch takes up more of the circumference of the tyre so for any given rotation, the sidewall has to compress more to get the contact patch on to the road. Deforming the tyre creates heat. With a longer contact patch and more sidewall deformation, the tyre spends proportionately less time cooling off than a wider tyre which has a shorter contact patch and less sidewall deformation. Why does this matter? Well because the narrower tyre has less capacity for cooling off, it needs to be made of a harder rubber compound in order to better resist heating in the first place. The harder compound has less mechanical keying and a lower coefficient of friction. The wider tyres are typically made of softer compounds with greater mechanical keying and a higher coefficient of friction. And voila - wider tyres = better grip. But not for the reasons we all thought. pratim tvoje postove od pocetka. ovdje se vodi, ajmo nazvat rasprava, na temu gdje svatko napise svoje misljenje i pokusa to obrazloziti argumentima i nekakvim iskustvom. ovo tvoje copy pasteanje nema nikakvog smisla jer nitko tu na forumu nije toliko debilan da ne zna koristiti google kao ti. ako nemas kaj napisati iz vlastitog iskustva nemoj ni C/P-ati jer to i samo mozemo nac Edited April 16, 2009 by Lepi Link to comment Share on other sites More sharing options...
alenp Posted April 16, 2009 Share Posted April 16, 2009 Uža guma se obično veže uz manji otpor kotrljanja i manju potrošnju, veći top speed, bolja međuubrzanja... Ali na kraju se to sve svede na optimiziranje dimenzija, da bude dobra u svim uvjetima, a ne odlična u nečem, a loša u nečem drugom... Ja znam da se preširokom gumom puši na ubrzanju i međuubrzanju... Ostalo me i tako ne zanima.. :rofl: Koliko ono ti brzina vrtis u prazno? Mozda se pusi na meduubrzanju ali da ces ti bolje ubrzat sa manjom gumom, cisto sumnjam, brze ces ubrzat ako su idealni uvjeti za to, ne govorim o tome da mi je cestovna 18" a stavis slick 16" i onda radis usporedbu.. Stavi 18" 215 gumu i 18" 235 gumu pa mjeri ubrzanje do 100 :thumbsup: Internet je cudo:) Link to comment Share on other sites More sharing options...
tcode Posted April 16, 2009 Share Posted April 16, 2009 Generalno, za ubrzanje je bolja uža guma sa višim profilom, dok za zavoje vrijedi obrnuto, tako da ne postoji idealna guma za sve vrste vožnje. Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 Ja ću ići na 205/50-R16 jer je to standardna dimenzija za ovu getribu i motor... Imam sad 195/45-R16 i na 1bar vrti prvije dvije, ponekad i treću... A tcodu koliko sam čuo na 1.6bar vrti i četvrtu.... :lol: Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 Ja ću ići na 205/50-R16 jer je to standardna dimenzija za ovu getribu i motor... Imam sad 195/45-R16 i na 1bar vrti prvije dvije, ponekad i treću... A tcodu koliko sam čuo na 1.6bar vrti i četvrtu.... :lol: Link to comment Share on other sites More sharing options...
MarioST Posted April 16, 2009 Share Posted April 16, 2009 Ja samo znam da mi je auto na 205/40-17 prilično sporiji nego na 185/65-14 koje su tvorničke. Neman pojma koliko su teske celicne 14", ove 17" sad su 9.5 kg Link to comment Share on other sites More sharing options...
Josey Posted April 16, 2009 Share Posted April 16, 2009 e sad ovo citam, i nevjerujem ... ja san prominija tvornicke felge sa 8kg na 9.5kg i nisan osjetija nikakvu razliku u ubrzanju, mozda je zanemarivo malo, a opet nebi trebalo bit Link to comment Share on other sites More sharing options...
mr_G Posted April 16, 2009 Share Posted April 16, 2009 Čelične su sigurno i teže od 10kg, ali im je centar mase bliže centru vrtnje zato auto i ide bolje... Ja samo kažem da ne treba pretjerati širinom gume... Link to comment Share on other sites More sharing options...
13snc Posted April 16, 2009 Share Posted April 16, 2009 hmm... a zato meni stari sa e90 i 24ks vise ne bjezi ni centimetar.. replike 18" vs. Sparco 17" Link to comment Share on other sites More sharing options...
Debeli Posted April 16, 2009 Share Posted April 16, 2009 hmm... a zato meni stari sa e90 i 24ks vise ne bjezi ni centimetar.. replike 18" vs. Sparco 17" jer ima 300 kila više Link to comment Share on other sites More sharing options...
13snc Posted April 16, 2009 Share Posted April 16, 2009 wrong! http://www.carfolio.com/specifications/models/car/?car=159071 http://www.carfolio.com/specifications/models/car/?car=125389 s tim da meni u prometnoj pise 1389kg.. moj je 2007 pa je mozda otezao.. 100kg tocno razlika.. Link to comment Share on other sites More sharing options...
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