tyre sizes for an auto to improve top speed |
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mabbo
Groupie Joined: 18 Oct 08 Status: Offline Points: 198 |
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Posted: 05 Sep 11 at 19:27 |
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hello
i have a 2.1 auto t3 and would like some taller tyres to improve the top speed / lower the rpm whilst on the motorway. at the moment it had some 15" penta's with 205/55r15 i think... they might be 50s. i cant remember ignore the wrong colour door :( anyway, would changing to a 205/60 or 65 make much of a difference? how much of a diff would it make to driving around town? cheers
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Steve B
Vanorak Joined: 26 Apr 05 Location: Mong free zone Status: Offline Points: 13190 |
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The correct tyre for 15's is either 195/70/15,205/65/15 or 215/65/15 depending on the wheel width?
By fitting any of those size tyres it will only improve your current set up....plus the tyres you're running at present are more than likely car tyres and aren't load rated for a T3. |
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chris7ian
Yardie Joined: 28 Jul 10 Status: Offline Points: 821 |
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I'm interested in upping the rear tyres on my 2.1 auto too - how much bigger than stock is feasible?
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mabbo
Groupie Joined: 18 Oct 08 Status: Offline Points: 198 |
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cheers steve
i thought the standard tyre size is 185r15, which give a overall diameter of 659mm 195/70r15 = 654mm 205/65r15 = 648mm 215/65r15 = 661mm ill have to check but im sure my tires are 205/55r15 = 607mm so quite a bit smaller than the above. might get them changed to 205/65r15 cheers |
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Steve B
Vanorak Joined: 26 Apr 05 Location: Mong free zone Status: Offline Points: 13190 |
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The T3 standard tyre size is 185R14 which is 654mm.
There's also a tyre calculator in the information section....click on the Brick-Yard logo top left. Edited by Steve B - 05 Sep 11 at 22:02 |
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mabbo
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i cant remember the width off the top of my head, ill have to check but iv got a feeling they are 6J
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Steve B
Vanorak Joined: 26 Apr 05 Location: Mong free zone Status: Offline Points: 13190 |
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205's will be fine on 6" or 7" wide alloys.
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mabbo
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Just checked, they are 205/50r15 and the wheels are 15x7
my wheels/tyres are 586mm, if 185R14 is 654mm then thats a pretty big difference ill get them changed at some point :)
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Steve B
Vanorak Joined: 26 Apr 05 Location: Mong free zone Status: Offline Points: 13190 |
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I'd say change the rears a.s.a.p as it will help your gearbox as well as your pocket.
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niko
Vanorak Nice fella. Joined: 01 Jul 07 Location: Stroke On Tent Status: Offline Points: 2639 |
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im going to have a tdi engine soon....and may stick with the stock gearbox for a while.
my tyres are currently 225 60 16.....what practical difference would 17" wheels make...with maybe a 65 profile.
i have seen the calculator to work out diameter.....but what would 20,30 or even 50mm difference make to cruising speed.
this stuff is complicated to the unitiatated...
i have looked at gearbox codes too without much success....what does the final drive mean in simple terms....what do people go for when they have a refurbed box (aka Aidan T)....
any help appreciated
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1989 westy Joker now with TDi
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samuelvincentvella
Yardie Joined: 30 May 08 Location: Kent Status: Offline Points: 516 |
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Nikko and Mabbo
I have worked on getting a final drive ring and pinion made up for chaps like us with mopre powerful engines. Stock auto final drives are either 4.09 or 3.27. I have the new 3.27 in my auto with my 2.5 subaru. It has dropped the revs by about 800rpm on the motorway and I'm elated with it.
We just put in an order for 60 and most are going to the US, but I kept a few here for UK guys. It'll solve the rpm issues without putting stupid big tyres on the rear.
Let me know of youre interested.
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niko
Vanorak Nice fella. Joined: 01 Jul 07 Location: Stroke On Tent Status: Offline Points: 2639 |
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wish i had known about 6 weeks ago...bit late for me now.
but thanks for the tip off.
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1989 westy Joker now with TDi
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Diablodub
Moderator Group mehcedes... Joined: 13 Oct 05 Location: Stu Land Status: Offline Points: 13596 |
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Niko with those tyres you speedo will show 52 when doing 70 , 25% drive ratio change , total change in ride height is 68mm
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brick-yard splitters breakaway judean peoples front cheesy toss wank - Member No 1
07974 787780 - Stu |
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Tee3
Admin Group Coprophagous Cretin Joined: 06 Jun 04 Location: Huddersfield Status: Offline Points: 9763 |
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Is yours an Auto? Hows that work with the TDI? |
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YOU CANT EDUCATE GAMMON http://www.tee3.co.uk/ |
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samuelvincentvella
Yardie Joined: 30 May 08 Location: Kent Status: Offline Points: 516 |
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Been here for 18 months ;) |
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niko
Vanorak Nice fella. Joined: 01 Jul 07 Location: Stroke On Tent Status: Offline Points: 2639 |
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no..sorry...mines not an auto....excuse my ignorance...does this only work for an auto ?
Edited by niko - 10 Jan 12 at 22:20 |
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1989 westy Joker now with TDi
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niko
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hi Diablodub.. sorry ...dont have a clue what you mean. which tyres...and which drive ? most of this stuff is complete mumbo jumbo to me ?
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1989 westy Joker now with TDi
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niko
Vanorak Nice fella. Joined: 01 Jul 07 Location: Stroke On Tent Status: Offline Points: 2639 |
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this is where im at
having 215 65 16 tyres fitted on the rear on saturday. (205 65 16 on the front) im pretty happy with my set-up now ...but i know my current tyres are not right ( they are actually 205 55 16 (not 225 like i said months ago...i was talking pissed up then) i used the calculator and i think im not far over stock. (just about 5%...but about 8% from where i am with my current "small" tyres) therefore the new tyres should only improve things.... i hope this makes some sense.
Edited by niko - 10 Jan 12 at 22:36 |
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1989 westy Joker now with TDi
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Diablodub
Moderator Group mehcedes... Joined: 13 Oct 05 Location: Stu Land Status: Offline Points: 13596 |
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The difference between 185/70/15 and 215/65/16 , actual speed 70 , speedo reading 65.
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brick-yard splitters breakaway judean peoples front cheesy toss wank - Member No 1
07974 787780 - Stu |
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niko
Vanorak Nice fella. Joined: 01 Jul 07 Location: Stroke On Tent Status: Offline Points: 2639 |
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cheers
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1989 westy Joker now with TDi
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