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Would New Tyres Slow A Car Down?

#1 User is offline   David 

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Posted 07 January 2005 - 01:21 PM

Ever since I got my new tyres, the car has felt slightly slower at accelerating - in 2nd and 3rd most noticeably. Now, the only thing I can think of that would do it is the tyres themselves. I don't imagine the LSD would effect it in any way.
My line of thinking is - since the old P7000's were so knackered they would have not only been lighter than the new Toyo's but also have a diameter of around 0.5cm smaller. Would this make any difference do you think? Or is it all just in my head? laugh.gif Either that or the fact that the gearbox hasn't loosened up yet could be doing it, but that wouldn't slow the acceleration would it?
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#2 User is offline   David 

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Posted 07 January 2005 - 01:29 PM

Oops, sorry. Supposed to go in the tyres section. :wink:
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#3 User is offline   Turby 

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Posted 07 January 2005 - 01:36 PM

probably all in your head...

The new gearbox will need running in, even more so than the 1.7 Puma engine
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#4 User is offline   David 

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Posted 07 January 2005 - 01:37 PM

QUOTE
probably all in your head...

The new gearbox will need running in, even more so than the 1.7 Puma engine

How would you suggest doing so? The same as running an engine in I guess?
David - Clio Trophy now sold! Megane R26 on the way - ETA March 1st 2008.
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#5 User is offline   Spoke 

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Posted 07 January 2005 - 01:52 PM

Just plod it around using as normal, should free up after a short while. Just like a new car.

Would be very surprised if the tyres were cause your loss of performance.
Christophe-lamb-chop
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#6 User is offline   Turby 

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Posted 07 January 2005 - 02:04 PM

No fast gear changes at high rpm would probably do the trick... you are bedding in the synchro's as much as the gears... other than that drive like your granny for 100,000 miles smile.gif
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#7 User is offline   David 

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Posted 07 January 2005 - 03:23 PM

It is probably in my head. laugh.gif The gearbox is still quite stiff, but it's getting looser. 8)
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#8 Guest_Matt and Tiggr_*


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Posted 07 January 2005 - 04:10 PM

QUOTE
Oops, sorry. Supposed to go in the tyres section. :wink:


Moved ;-)

May be that the extra rubber making the tyres bigger slows the acceleration down a bit ;-)

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Posted 07 January 2005 - 04:12 PM

If this were true then the police would be giving free sets away me thinks!
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#10 User is offline   MattJ 

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Posted 07 January 2005 - 07:06 PM

I've always found that new tyres make a car feel quicker as theres more grip.......
Matt

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#11 User is offline   BOK 

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Posted 07 January 2005 - 07:29 PM

I suspect the new tyres may be much quieter than the old ones which may make the car seem slower.

Stick on a bean can as your back box and replace your airbox with a lampshade so you feel like you're doing 200mph when you're only doing 20 cool2.gif

#12 User is offline   David 

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Posted 07 January 2005 - 10:14 PM

QUOTE
I've always found that new tyres make a car feel quicker as theres more grip.......

Oh yeah, no doubt it is around bends and when pulling away. :mrgreen: I think it's a combination of all the reasons above, the extra diameter doing a little and then noise etc amply this in my head. laugh.gif
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#13 User is offline   steverush 

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Posted 08 January 2005 - 01:00 AM

Once new tyres are run in, I always find the car quicker, so, I'm certain it's not the tyres!
Started with a R reg Radiant Red, then a Milly, then an FRP, but all good things come to an end. FRP257 has now been swapped.. for a 197BHP Honda.......

#14 User is offline   danellis 

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Posted 08 January 2005 - 09:24 AM

Slightly bigger types will make the car go faster. The outside of the wheels have to go further for each revolution (larger diameter = larger circumference) so it'll go slightly faster
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#15 User is offline   Batman 

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Posted 08 January 2005 - 09:54 AM

QUOTE
Slightly bigger types will make the car go faster.  The outside of the wheels have to go further for each revolution (larger diameter = larger circumference) so it'll go slightly faster


top speed is theoretically higher but acceleration will be slower since effectively the gearing is higher
Col
Ex 2 x 1.7 Puma, 1 x FRP #395
Now driving Renaultsport Clio V6 255

#16 User is offline   danellis 

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Posted 08 January 2005 - 10:32 AM

Gotya.

Thanks Batman,
DJ
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#17 User is offline   Katwoman 

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Posted 08 January 2005 - 05:30 PM

QUOTE
I've always found that new tyres make a car feel quicker as theres more grip.......


I agree mine feels so much better...
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