Q for GC8,Corradoboy,Stev,BOB'5 & Tony
10 October 2006, 03:00 PM
#1
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Q for GC8,Corradoboy,Stev,BOB'5 & Tony
Hi,
A question for the clever folk on Scoobynet !!
Just bought 4 Toyo TR1's from my local dealer and they changed the pressures from 32 all round to 33 F, 31 Rear. Big improvement in handling !
Decided to do a "search" but could find no real consensus !!
So what tyre pressures are you guys running ?
My car's a mapped 01 bug (Prodrive headlamps !) with Prodrive springs plus Whiteline ARB and droplinks.
Thanks in advance !
Andy
A question for the clever folk on Scoobynet !!
Just bought 4 Toyo TR1's from my local dealer and they changed the pressures from 32 all round to 33 F, 31 Rear. Big improvement in handling !
Decided to do a "search" but could find no real consensus !!
So what tyre pressures are you guys running ?
My car's a mapped 01 bug (Prodrive headlamps !) with Prodrive springs plus Whiteline ARB and droplinks.
Thanks in advance !
Andy
10 October 2006, 04:53 PM
#2
Scooby Regular
Join Date: May 2001
Location: Edinburgh (outskirts)
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
Hi Andy
Not sure about the clever bit
I usually go for 33 at the front and 30 at the back, but will increase the pressure in the rears a wee bit (31/32) if the car is heavily laden.
Not sure about the clever bit
I usually go for 33 at the front and 30 at the back, but will increase the pressure in the rears a wee bit (31/32) if the car is heavily laden.
10 October 2006, 06:08 PM
#5
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Stev
Hi Andy
Not sure about the clever bit
I usually go for 33 at the front and 30 at the back, but will increase the pressure in the rears a wee bit (31/32) if the car is heavily laden.
Not sure about the clever bit
I usually go for 33 at the front and 30 at the back, but will increase the pressure in the rears a wee bit (31/32) if the car is heavily laden.
When I first came on Scoobynet i read a thread where someone said it should be 32F and 34 REAR !! I can confirm that made the car handle horribly !
Consensus seems to be about 3 more PSI in the front ?
And does higher pressure (eg 35 at the front) mean the car is more skittish in the wet ??
Andy
10 October 2006, 06:22 PM
#7
Scooby Regular
Join Date: May 2004
Location: North Yorks
Posts: 254
Likes: 0
Received 0 Likes
on
0 Posts
The Subaru recommended settings are 33 front and 31 rear on my MY04STi.
I always dial this in (cold) when setting out for a fast run on the road.
On track days you get all sorts of advice, usually to put more pressure in. Personally I now start track days at the 33/31 and adjust if necessary once I have got a feel for the day. It all depends on conditions - for example on a torrential day at Elvington I uppped the pressures to high 38/36 and suddenly I lost loads of grip and in fact spun the car at quite a speed. Dropped the pressures back to 31/33 and she behaved nicely again.
No expert - but my feedback based on experience.
Dave
I always dial this in (cold) when setting out for a fast run on the road.
On track days you get all sorts of advice, usually to put more pressure in. Personally I now start track days at the 33/31 and adjust if necessary once I have got a feel for the day. It all depends on conditions - for example on a torrential day at Elvington I uppped the pressures to high 38/36 and suddenly I lost loads of grip and in fact spun the car at quite a speed. Dropped the pressures back to 31/33 and she behaved nicely again.
No expert - but my feedback based on experience.
Dave
Trending Topics
10 October 2006, 06:26 PM
#8
Tryes a bit of a dark art - best to mess about with different pressures to see what suits you.
For the road - with a scoob - I always put in less Psi in the rears and more in the front.
The reason for this is to make on the limit handling more predictable.
Taking a standard scoob 50-50 power distribution front and rear. If driven properly this will understear on the limits of its grip.
So given that fast, safe progress is all about what a car will do predictably on the limits of its grip - More air in the front makes for a ´harder´ tyre - it may even fractionaly lessen the contact patch. So the Fronts will definately go first, It will understear, I know exactlywhat it is going to do.
Less in the rears makes for a ´softer´ tyre
and so therefore gives more grip. They will let go after the fronts -unless you start trail lifting,breaking etc.
Hope this explains why different pressures are good for ROAD driving.
Steve
For the road - with a scoob - I always put in less Psi in the rears and more in the front.
The reason for this is to make on the limit handling more predictable.
Taking a standard scoob 50-50 power distribution front and rear. If driven properly this will understear on the limits of its grip.
So given that fast, safe progress is all about what a car will do predictably on the limits of its grip - More air in the front makes for a ´harder´ tyre - it may even fractionaly lessen the contact patch. So the Fronts will definately go first, It will understear, I know exactlywhat it is going to do.
Less in the rears makes for a ´softer´ tyre
and so therefore gives more grip. They will let go after the fronts -unless you start trail lifting,breaking etc.
Hope this explains why different pressures are good for ROAD driving.
Steve
10 October 2006, 07:24 PM
#9
Scooby Senior
iTrader: (8)
Join Date: Sep 2002
Location: www.m-soc.com
Posts: 3,684
Likes: 0
Received 0 Likes
on
0 Posts
Well said. I used to change my tyre pressures slightly depending on what driving i was doing. A weekend blast on Peak tour or something I used to run 31/32 F and 31/30 rear and day to day (i.e. where I wasn't ragging it around). I used to run 33 F 32 R. With these higher pressure over time I found that the tyre wear rate was reduced and so didn't need changing as often
I guess also when you are doing a spirited drive as the tyre heats the pressure rises in the tyre anyway ? I think thats right
You might find a bigger improvement if you fill the tyres with an inert gas instead of standard air as the pressures will be less prone to moving
I may be all wrong with the above but it seems to make sense to me
Steve
I guess also when you are doing a spirited drive as the tyre heats the pressure rises in the tyre anyway ? I think thats right
You might find a bigger improvement if you fill the tyres with an inert gas instead of standard air as the pressures will be less prone to moving
I may be all wrong with the above but it seems to make sense to me
Steve
10 October 2006, 07:58 PM
#10
Scooby Regular
Join Date: May 2001
Location: Edinburgh (outskirts)
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by andythejock01wrx
Cheers Stev.
When I first came on Scoobynet i read a thread where someone said it should be 32F and 34 REAR !! I can confirm that made the car handle horribly !
Consensus seems to be about 3 more PSI in the front ?
And does higher pressure (eg 35 at the front) mean the car is more skittish in the wet ??
Andy
When I first came on Scoobynet i read a thread where someone said it should be 32F and 34 REAR !! I can confirm that made the car handle horribly !
Consensus seems to be about 3 more PSI in the front ?
And does higher pressure (eg 35 at the front) mean the car is more skittish in the wet ??
Andy
Andy
On my last Impreza I started off with 36 PSI at the front, but eventually settled for 34 PSI, which I felt gave the best balance and suited most weather conditions. In the RB5 I usually go for 33 or occasionally 34 PSI at the fronts.
High Pressure (36psi) made my car slightly more skittish in the wet and it had a bit less traction in the snow, but it was marginal. I went slightly lower as I did not notice much difference as far as grip was concerned in the dry, but it improved the ride quality.
I would try 36psi on the fronts and then experiment with a few lower settings down to 33 PSI in various conditions and you will find your preferred level.
10 October 2006, 10:57 PM
#12
Scooby Regular
Join Date: Aug 2003
Location: Sheffield; Rome of the North
Posts: 17,582
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by andythejock01wrx
Hi,
A question for the clever folk on Scoobynet !!
Just bought 4 Toyo TR1's from my local dealer and they changed the pressures from 32 all round to 33 F, 31 Rear. Big improvement in handling !
Decided to do a "search" but could find no real consensus !!
So what tyre pressures are you guys running ?
My car's a mapped 01 bug (Prodrive headlamps !) with Prodrive springs plus Whiteline ARB and droplinks.
Thanks in advance !
Andy
A question for the clever folk on Scoobynet !!
Just bought 4 Toyo TR1's from my local dealer and they changed the pressures from 32 all round to 33 F, 31 Rear. Big improvement in handling !
Decided to do a "search" but could find no real consensus !!
So what tyre pressures are you guys running ?
My car's a mapped 01 bug (Prodrive headlamps !) with Prodrive springs plus Whiteline ARB and droplinks.
Thanks in advance !
Andy
Simon
Last edited by GC8; 10 October 2006 at 11:02 PM.
10 October 2006, 10:58 PM
#13
Scooby Regular
Join Date: Aug 2003
Location: Sheffield; Rome of the North
Posts: 17,582
Likes: 0
Received 0 Likes
on
0 Posts
11 October 2006, 01:49 AM
#14
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GC8
Figured somebody with a Phd would know the answer ! Had read the Whiteline site when upgrading the supension, but completely overlooked what they had to say on tyre pressures, imagining that wouldn't make much difference ! DOH ! Have looked through it again ~ two questions :
- what is the "GC8" version they (and you !) refer to ?
- how do you add a URL address to S'net, as you did here ?
thanks again,
Andy
11 October 2006, 12:30 PM
#17
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by chocolate_o_brian
i usually ran my wrx on 34 front 32 rear, but shes going on saturday...
andy
andy
11 October 2006, 01:17 PM
#18
Scooby Regular
Join Date: Feb 2005
Location: Brighton no more
Posts: 2,170
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GC8
Note there are 5 parts to that; replace the '1' with '2', '3', '4' or '5' to get the other bits (I think).
11 October 2006, 01:29 PM
#19
Scooby Regular
iTrader: (22)
Join Date: May 2006
Location: Doncaster, S. Yorks.
Posts: 21,415
Received 0 Likes
on
0 Posts
Originally Posted by andythejock01wrx
Does she have a working engine now Andy ??
andy
58 mpg here i come....
11 October 2006, 04:14 PM
#20
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by chocolate_o_brian
nope selling her on saturday and buying a peugeot 106 1.5 d...d...d...diesel *GULP*
andy
58 mpg here i come....
andy
58 mpg here i come....
12 October 2006, 11:47 PM
#23
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by GazTheHat
That's right, miss me off the list 
about the footie ~ you guys are almost as good as us these days (think you could beat France in your current state ?!"
)
12 October 2006, 11:51 PM
#24
13 October 2006, 12:07 AM
#25
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Cheers Tony (apologies for forgetting your second name ! ).
What's the bhp on a std Spec C by the way ? Is it simply a remapped STi ?
).What's the bhp on a std Spec C by the way ? Is it simply a remapped STi ?
13 October 2006, 09:18 AM
#26
Scooby Regular
iTrader: (3)
Join Date: Aug 2000
Location: 1600cc's of twin scroll fun :)
Posts: 25,565
Likes: 0
Received 2 Likes
on
2 Posts
My car was rolling roaded last time at 318bhp (original Jap Map and standard exhaust system), with just an STi panel filter and a 3 inch H&S back box with 356lbs of torque, will "possably" have her on the rollers tomorrow with just v power in to see if there is any difference (previously using optimax and octane booster)
Tony
with 356lbs of torque, will "possably" have her on the rollers tomorrow with just v power in to see if there is any difference (previously using optimax and octane booster)Tony
13 October 2006, 12:21 PM
#27
Scooby Regular
Thread Starter
Join Date: Jun 2006
Location: Edinburgh (ish)
Posts: 8,089
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by TonyBurns
My car was rolling roaded last time at 318bhp (original Jap Map and standard exhaust system), with just an STi panel filter and a 3 inch H&S back box with 356lbs of torque, will "possably" have her on the rollers tomorrow with just v power in to see if there is any difference (previously using optimax and octane booster)
Tony
with 356lbs of torque, will "possably" have her on the rollers tomorrow with just v power in to see if there is any difference (previously using optimax and octane booster)Tony
Sounds great anyway !
Andy
Thread
Thread Starter
Forum
Replies
Last Post