Ash170990

iTrader: (1)

Hello guys,

Is there anything i can do to make the car feel more stable? As its going to be used on track as much as i can afford it will be regualy exceeding speeds of 100mph i imagine, but ive noticed when doing this sort of speed (on provate land ofcourse) the car starts to float about and just not feel planted atall.... Ive checked tyre pressures and there all ok, but just wondering if theres anything else i can do to give it a bit more downforce?

James N

iTrader: (10)

Have you done anything to the wheel alignment mate? Made a massive difference on mine. Just felt more planted.
Also my classic feels much better with the coilovers, but I'm guessing if its a track car it's already on uprated suspension..
Could be worth having a chat with any of the guys that run big power time attack cars etc.
I'm no expert on that kind of thing so someone will probably be along to correct me if I've said anything silly!

Shaid

Try solid droplinks whilst you are at it

Ash170990

iTrader: (1)

Was thinking 4 wheel allignment as it has p1 suspension on it, so dunno if it was done when this was fitted or not, so will get it booked in for this and see how we go.... Cheers fellas

romford-boy

Is it possible to widen the rear track easily? I know that was one of the upgrades from the 2004 STI to the 2005 STI, Subaru's specific aim was high speed stability.

leecalcars

iTrader: (37)

I regularly do speeds in excess of 120mph on track and more and dont suffer at all , running 2deg neg camber on all 4 wheels cdf solid drop link,white line arbs , coilovers etc etc
Depending on which tracks you use not all tracks are flat out for long there will be a wiggle/chicane ,bend hairpin or whatever to keep speeds under , how is the car reacting at 100mph?

leecalcars

iTrader: (37)

TonyBurns

iTrader: (3)

Classics suffer badly for high speed so you would have to take a serious look at the suspension and anti roll bars as well as an anti lift kit.
A front splitter may help as some of the air going under the car may also be adding to your issue.

leecalcars

iTrader: (37)

Think the alk helps but can't see the need for a splitter !

BHPvstorque

iTrader: (14)

all of the above will help ie solid drop links, decent suspension and splitters. not just froby but rear also ht autos do one it fits all along the back of the car and allows the air to cleanly leave the car quite surprising the difference I had from fitting as like to give mind a good blast and over 100mph the rear especially made a surprising amount of stability compared to without.

BHPvstorque

iTrader: (14)

hate predictive text sorry hope you get what I meant.

leecalcars

iTrader: (37)

So ht autos do a rear wind diffuser for a classic ???

jura11

iTrader: (7)

Front splitter helps against the front end lifting,rear diffuser will be efficient above 80-100mph

If you want go down the route aero,flat floor will help alot,is the lots of tweaking,tinkering about that myself as next step

Suspension setup(camber etc.),droplinks,ARB's,ALK will help too counter this


Jura

BHPvstorque

iTrader: (14)

I though that was the question how can I make the car more stable above 100mph so yes front splitter will stop lift at the front and the rear spoiler will make it feel more tied down and stop lift at the rear.

BHPvstorque

iTrader: (14)

Found the below on ht autos : Product Name : Rear lip/Diffuser Subaru Impreza
Product ID : 22brearlip
Product Price : £ 99.00
Quantity : lips

Rear splitter actually made from the lower half of 22B bumper with built in diffuser for 96-00

However sure they also do one similar to the bug eye one give them a call.

sonic93

iTrader: (16)

I know what you mean my type r the same bit light and floaty can't explain lol. Gonna get mine set up soon as .

jura11

iTrader: (7)

Here few PDF which I've uploaded and take look on them,they're older,but same will apply on today cars

Fred Puhn_How to make your car handle

http://www.mediafire.com/view/?gdb7h43tzd61atc

Race Car Aerodynamics - Joseph Katz - 1st Edition

http://www.mediafire.com/view/?ova3laaz33cchm6

About the rear diffuser,best is to do DIY and try if its works or not,many people making own one which working well or get diffuser which has been done and tested in aero tunnel like Voltex,Varis,APR and other makers

Here is the picture of the flat floor,how can looks on the car



Rear diffuser DIY




Jura

Ash170990

iTrader: (1)

Cheers fellas, appreciate it... Will start woth the 4 wheel allignment and go from there

BHPvstorque

iTrader: (14)

Would love one of those full flat floors anyone know who makes or can make them ?

BHPvstorque

iTrader: (14)

Just seen an identical rear diffuser lip on eBay for £55 plus £15 postage item no 150971442648

jura11

iTrader: (7)

I would go with full 4 wheel alignment,take car where people knows how to do and from this I decide

Jura

They're usually DIY flat floors,people trying first plywood and from that(if its OK) going with honeycomb aluminium/carbon/kevlar


Jura

sonic93

iTrader: (16)

How much would it be to make u recon I could do a ply template easy enough

jura11

iTrader: (7)

How much this will cost,not sure but if you are good with honeycomb aluminium or plywood this should be just material and lots of tweaking

Speak to Duncan@Race dynamix about this,he running on his TA car


Jura

sonic93

iTrader: (16)

Where u source this material ? Honey comb aluminium never heard of it

jura11

iTrader: (7)

This material you can source easily

http://www.easycomposites.co.uk/prod...honeycomb.aspx

I would go as first flat floor from plywood for testing/tweaking(plywood should be cheaper),later on if its final and done properly get honeycomb aluminium, which is rigid and is not so heavy and is easy to manipulate with this




Jura

sonic93

iTrader: (16)

Ur right it is cheap how would you fix it? Have you thought giving it a go ?

jura11

iTrader: (7)

You will need to make brackets for that,which should be no problem

Yes I was thinking alot about this and really we are thinking go with this maybe next year


Jura

dynamix

iTrader: (3)

It works

sonic93

iTrader: (16)

Just the man . Any pics of how you done yours and materials used ?

leecalcars

iTrader: (37)

Interested too mate any idea on price for a classic dunc ?