225/40/18 Tyre Pressures

2.7 V6 30v biturbo - 251bhp
2.7 V6 30v biturbo - 261bhp
Post Reply
Dippy
Cruising
Posts: 2710
Joined: Fri Jan 10, 2003 4:05 pm
Location: West Berks, UK
Contact:
Contact Dippy

225/40/18 Tyre Pressures

Post by Dippy » Wed Sep 15, 2004 8:58 am

Now that I've got my new wheels, I need to confirm the tyre pressures I should use. The fitter set them at 32 all round.

Does anyone know what pressures I should set? Is there an 'official' figure?
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
Top
DavidT
Cruising
Posts: 6096
Joined: Tue Jan 07, 2003 4:46 pm
Location: Cheshire

Post by DavidT » Wed Sep 15, 2004 9:59 am

I've got 235/40/17's on standard wheels and I run 38 all round.

I tried 34 and they just felt loose - too much give in the sidewalls I guess. 40 is too bouncy.

You will notice a harder ride I expect because of the lower profile, I did. It always amazes me when I swap to 45 tyres (track wheels) just how much of a difference there is.
Top
Dippy
Cruising
Posts: 2710
Joined: Fri Jan 10, 2003 4:05 pm
Location: West Berks, UK
Contact:
Contact Dippy

Post by Dippy » Wed Sep 15, 2004 1:11 pm

Thanks David. Although I've not had much time to judge, I haven't noticed the ride being much harder at all.

However the car does feel a little bit 'loose' when cornering hard, so maybe I should use a higher pressure and that will make the ride harder.

Does anyone else have a comment?
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
Top
User avatar
Nige_RS4
Cruising
Posts: 3264
Joined: Tue Feb 25, 2003 2:54 pm
Location: UK
Contact:
Contact Nige_RS4

Post by Nige_RS4 » Wed Sep 15, 2004 1:31 pm

Dippy, here's a selection of answers when I asked the same question last year ...
http://www.rs246.com/index.php?name=PNp ... highlight=

I currently run 36 on the front and 34 on the rear - I tried 38 all round, but my teeth didn't like it on all but the smoothest of roads.

Nige.
Top
Dippy
Cruising
Posts: 2710
Joined: Fri Jan 10, 2003 4:05 pm
Location: West Berks, UK
Contact:
Contact Dippy

Post by Dippy » Thu Sep 16, 2004 12:16 pm

Thanks Nige.
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
Top
Dippy
Cruising
Posts: 2710
Joined: Fri Jan 10, 2003 4:05 pm
Location: West Berks, UK
Contact:
Contact Dippy

Post by Dippy » Thu Sep 16, 2004 12:18 pm

Thanks Nige.
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
Top
DavidT
Cruising
Posts: 6096
Joined: Tue Jan 07, 2003 4:46 pm
Location: Cheshire

Post by DavidT » Thu Sep 16, 2004 12:29 pm

Lowering the rears way down to about 25 does make for some pretty exciting oversteer action. Not for the public roads though.
Top
eric_mok
Neutral
Posts: 23
Joined: Sat Dec 20, 2003 9:58 am

Post by eric_mok » Thu Sep 16, 2004 2:57 pm

Correct me if i'm wrong. I thot the rear needs to run higher pressure to increase oversteer??
Top
DavidT
Cruising
Posts: 6096
Joined: Tue Jan 07, 2003 4:46 pm
Location: Cheshire

Post by DavidT » Thu Sep 16, 2004 3:17 pm

eric_mok wrote:Correct me if i'm wrong. I thot the rear needs to run higher pressure to increase oversteer??
You may well be right, but I have experience of it the other way around too.
Top
Post Reply

Return to “S4 (B5 Typ 8D) 1997-2002”

Who is online

Users browsing this forum: No registered users and 42 guests