Go Back   Team-BHP > Under the Hood > Modifications & Accessories


Reply
 
Thread Tools Search this Thread
Old 13th October 2008, 21:55   #151
Senior - BHPian
 
abhinav.gupta88's Avatar
 
Join Date: Sep 2007
Location: Delhi , India
Posts: 4,087
Thanked: 308 Times
Default

As far as i know , top speed should be better with low profile tyres.
Can someone confirm this.

And my personal opinion says 15" stock alloys painted purple definitely look better than the previous ones
abhinav.gupta88 is offline   Reply With Quote
Old 13th October 2008, 22:07   #152
Distinguished - BHPian
 
karan561's Avatar
 
Join Date: Aug 2006
Location: Mumbai
Posts: 3,749
Thanked: 9,167 Times
Default

Quote:
Originally Posted by abhinav.gupta88 View Post
As far as i know , top speed should be better with low profile tyres.
Can someone confirm this.

And my personal opinion says 15" stock alloys painted purple definitely look better than the previous ones
Well , its the width which decreases TOP SPEED , i.e. 225/45 R17 setup decreased the Top Speed , where as the 205/60 R15 did not hamper the top speed . .

And about the Purple painted ALLOYs , theres a small little surprise coming up . . check out this thread soon . . have an update in the alloys . .

Last edited by karan561 : 13th October 2008 at 22:08.
karan561 is offline   Reply With Quote
Old 13th October 2008, 23:03   #153
Senior - BHPian
 
abhinav.gupta88's Avatar
 
Join Date: Sep 2007
Location: Delhi , India
Posts: 4,087
Thanked: 308 Times
Default

If the width decreases the top speed , why is it that the lambos and others have tyres
like 235/35ZR19 in the front and 295/30ZR19 ( in the Gallardo)

Wont the width in this case decrease the top speed?

EDIT : Waiting for the update on the alloys
abhinav.gupta88 is offline   Reply With Quote
Old 13th October 2008, 23:03   #154
Senior - BHPian
 
iraghava's Avatar
 
Join Date: Oct 2005
Location: Bhaiyyaland
Posts: 8,028
Thanked: 153 Times
Default

Wider tyres especially the increased rim size means higher drag due to the heavier tyres/wheels & of course the added load due to the increased contact patch.

IMO 225/45 R17 is too wide for a stock Corolla.

Quote:
Originally Posted by abhinav.gupta88 View Post
If the width decreases the top speed , why is it that the lambos and others have tyres
like 235/35ZR19 in the front and 295/30ZR19 ( in the Gallardo)

Wont the width in this case decrease the top speed?
Because they have about 500 bhp+ whereas a stock Corolla has 125 bhp. They can get away by using wider tyres since they have the power to use them and also since they're high performance cars, they need the wide rubber to put the power down effectively & also maintain firm grip on the road while takeing turns/curves at insane speeds.

Two different car, two difference purposes. I don't think a comparison between them is correct Abhinav.

Last edited by iraghava : 13th October 2008 at 23:06.
iraghava is offline   Reply With Quote
Old 14th October 2008, 11:48   #155
BHPian
 
im_srini's Avatar
 
Join Date: Sep 2006
Location: Portland
Posts: 956
Thanked: 368 Times
Infractions: 0/1 (5)
Default

Hi guys, very interesting observation Karan & iRaghava...

These are not comprehensive or rigorous, but, by switching to a taller tire (~7.3 mm), the torque arm has increased in length, but not by much. The gearing at the contact patch decreases from 3.189 to 3.152, so the drop is very very small (~1.2%).

Coming to aero drag, the section width has increased by 20 mm due to the tire change. Assuming a ground clearance of 16 mm, & even allowing for a Cd of 1.0 (way too high as the tire curves away), the aerodynamic force due to the increased width alone, at a speed of 200 Kmph, is around 1.1 N only.

If you ask me, I don't think increased aero drag due to the wider tires alone can explain the relatively large drop (> 5%) seen in the top speed. The tune of the car could've decreased or other mods (like a body-kit) could be at fault. The rolling resistance could've increased too (although I think stiffer tires have lower rolling resistance values). Other things to consider - the tire pressures could've been lower, or the tread could've been thicker !

Last edited by im_srini : 14th October 2008 at 11:58.
im_srini is offline   Reply With Quote
Old 14th October 2008, 16:18   #156
Senior - BHPian
 
autopsyche's Avatar
 
Join Date: Nov 2004
Location: New Delhi, India
Posts: 1,516
Thanked: 14 Times
Default

The drop is definitely due to 2 reasons

1. increased rolling road friction because of additional width

2. increase in unsprung weight on the drivetrain

These two factors are very much capable of reducing top speed by upto 10%
autopsyche is offline   Reply With Quote
Old 14th October 2008, 19:50   #157
BHPian
 
abhik's Avatar
 
Join Date: Aug 2007
Location: New Delhi
Posts: 848
Thanked: 8 Times
Default

Quote:
Originally Posted by abhinav.gupta88 View Post
If the width decreases the top speed , why is it that the lambos and others have tyres
like 235/35ZR19 in the front and 295/30ZR19 ( in the Gallardo)

Wont the width in this case decrease the top speed?

EDIT : Waiting for the update on the alloys
Bro if you are looking at the Lambo then do keep in mind you are looking at a RWD most importantly and wider tyres to harness the insane amount of BHP and put it on the road. Goes for almost all RWDs with lots of power. Wider rear to put down the power, smaller front tyres to aid handling.
And rightly said by Ishaan the cars being compared are not right as each of them are in their own leagueand made/built for separate purposes.
abhik is offline   Reply With Quote
Old 14th October 2008, 23:38   #158
Distinguished - BHPian
 
karan561's Avatar
 
Join Date: Aug 2006
Location: Mumbai
Posts: 3,749
Thanked: 9,167 Times
Default

And guys the ALLOYS are TAIWANESE make , so not the best quality racing alloys which are a lot HEAVIER so that is also one of the major factors for the top speed not goin above 200 .

Another experience i want to share is that with the Stock Setup , and engine under stock conditions just about did a 200 , but when added with the performance mods and checked the top speed (after getting back to 15"s) it did a 210 , where as the top SPEED of A COROLLA is 196 km/h (taking the speedo errors into picture) .
karan561 is offline   Reply With Quote
Old 15th October 2008, 22:46   #159
Distinguished - BHPian
 
karan561's Avatar
 
Join Date: Aug 2006
Location: Mumbai
Posts: 3,749
Thanked: 9,167 Times
Default

Quote:
Originally Posted by karan561 View Post

And about the Purple painted ALLOYs , theres a small little surprise coming up . . check out this thread soon . . have an update in the alloys . .
Well , have painted the 17" Chrome Alloys ( minus the spinners ) Purple , and have left the circumfrence CHROME .
They are looking HOT .
Will upload the pic. soon. cheers:
karan561 is offline   Reply With Quote
Old 15th October 2008, 22:53   #160
BHPian
 
abhik's Avatar
 
Join Date: Aug 2007
Location: New Delhi
Posts: 848
Thanked: 8 Times
Default

Quote:
Originally Posted by karan561 View Post
Well , have painted the 17" Chrome Alloys ( minus the spinners ) Purple , and have left the circumfrence CHROME .
They are looking HOT .
Will upload the pic. soon. cheers:
That should be a looker! So switching back to 17s?
Waiting for the pics!
abhik is offline   Reply With Quote
Old 15th October 2008, 23:05   #161
Distinguished - BHPian
 
karan561's Avatar
 
Join Date: Aug 2006
Location: Mumbai
Posts: 3,749
Thanked: 9,167 Times
Default

Quote:
Originally Posted by abhik View Post
That should be a looker! So switching back to 17s?
Waiting for the pics!
Already have . . will upload the pics by tomorrow .
karan561 is offline   Reply With Quote
Old 16th October 2008, 22:27   #162
Distinguished - BHPian
 
karan561's Avatar
 
Join Date: Aug 2006
Location: Mumbai
Posts: 3,749
Thanked: 9,167 Times
Default

Sorry for the poor quality image .(was taken when the car was going for wheel alignment and balancing)
Will post better pics. soon .
So is it looking better now ?
Attached Thumbnails
My Modded Corolla (Angel Eyes,TRD grill & more)-21082008.jpg  

karan561 is offline   Reply With Quote
Old 16th October 2008, 23:29   #163
Senior - BHPian
 
abhinav.gupta88's Avatar
 
Join Date: Sep 2007
Location: Delhi , India
Posts: 4,087
Thanked: 308 Times
Default

Quote:
Originally Posted by iraghava View Post
Wider tyres especially the increased rim size means higher drag due to the heavier tyres/wheels & of course the added load due to the increased contact patch.

Because they have about 500 bhp+ whereas a stock Corolla has 125 bhp. They can get away by using wider tyres since they have the power to use them and also since they're high performance cars, they need the wide rubber to put the power down effectively & also maintain firm grip on the road while takeing turns/curves at insane speeds.

Two different car, two difference purposes. I don't think a comparison between them is correct Abhinav.
Quote:
Originally Posted by abhik View Post
Bro if you are looking at the Lambo then do keep in mind you are looking at a RWD most importantly and wider tyres to harness the insane amount of BHP and put it on the road. Goes for almost all RWDs with lots of power. Wider rear to put down the power, smaller front tyres to aid handling.
And rightly said by Ishaan the cars being compared are not right as each of them are in their own leagueand made/built for separate purposes.
Quote:
Originally Posted by autopsyche View Post
The drop is definitely due to 2 reasons
1. increased rolling road friction because of additional width
2. increase in unsprung weight on the drivetrain
These two factors are very much capable of reducing top speed by upto 10%
Thanks for the info guys

For once i was made to think that Super cars will run faster if on less wider tyres.

@ Ishan
I wasn't actually comparing the rides ( just wanted to know why the sports car have wider tyres when wider tyres lower the speed ( like in karan's corolla)


@ karan
Please put a clearer picture of the alloy
The chrome finishing you have left is looking just too amazing.
nice thought
cheers:
Abhinav
abhinav.gupta88 is offline   Reply With Quote
Old 16th October 2008, 23:45   #164
Senior - BHPian
 
faithless_1984's Avatar
 
Join Date: Oct 2006
Location: Delhi
Posts: 1,517
Thanked: 185 Times
Default

Quote:
So is it looking better now ?
Yes ,much better.!
Looking forward to some better quality pics now.
faithless_1984 is offline   Reply With Quote
Old 17th October 2008, 22:21   #165
Distinguished - BHPian
 
karan561's Avatar
 
Join Date: Aug 2006
Location: Mumbai
Posts: 3,749
Thanked: 9,167 Times
Default

Quote:
Originally Posted by faithless_1984 View Post
Yes ,much better.!
Looking forward to some better quality pics now.
Thanks , Really busy with college right now , Will post better quality pics. soon .
karan561 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modded Front Grill for the Honda City? Bopanna19 Modifications & Accessories 13 28th February 2013 11:05
Modded Toyota Corolla Altis- Projector CCFL Angel Eyes, Spoilers, Side Visor jocreative Modifications & Accessories 108 8th July 2012 12:33
How to make Angel Eyes nikibusa Technical Stuff 33 3rd February 2009 00:39
My lancer with angel eyes added anku Modifications & Accessories 24 3rd July 2008 02:06
Anyone Has Round Heal Lights(Angel Eyes) Like the BMW For Honda City 1.5 vtec? ollie Modifications & Accessories 26 7th July 2006 17:55


All times are GMT +5.5. The time now is 16:04.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks