High speed rear downforce

[Ronin225]

Go hardcore and get hold of one of the supercopa rear wings
These were adjustable so can have a play to suit the front

 

[hyphon12]

My understanding is if you soften up the rear you'll induce more understeer. The biggest problem I have is a light footprint at the rear at high speed. I'm afraid this is an aerodynamic issue...

I have plenty understeer in medium/low speed corners already so.. don't need more of that

Yeah there is that, which is why we always do minor adjustments, its just trying to find the best balance of the two which is very time consuming (Example: We only had 2 Stages left in a rally when finally got a good setup ).

As for aero you could just go mental and get a supercopa wing
EDIT: ah someone beat me to it

 

[Gulfstream]

Go hardcore and get hold of one of the supercopa rear wings
These were adjustable so can have a play to suit the front

Wonder if they are detachable.. where I live that wouldn't stay on the car for more than a few days before someone decides they deserve it more than me...

Also, my car is registered as a streetcar so everything I do to the car MUST look oem or else MOT guys will require a rebuilt vehicle registration MOT check and my god that's a pain, not to say expensive.

 

[hyphon12]

Maybe look into a splitter attachment for the the original spoiler? just like an attachable lip to lift the tail end of it?

 

[Ronin225]

Actual wing detaches from brackets.
However the brackets bolt to the inside of the boot lid and go through a plastic rear window, so would never look OE

 

[Rgm racer]

Looking for a little less lift over the rear of my LCR. Would this be an improvement?

http://www.dcp-shop.co.uk/2309S-Seat-Leon-WRC-rear-spoiler?osCsid=1314189056f616285ef2998a9bf3f5ee

Be interesting to see more photos or better still in the flesh as it does look as though it is angled upwards slightly to give more downforce compared to oem being flat?

A few are not really understanding your situation as you already have all the best "normal" mods but require even more due actually more to do with the type of driving [track] your doing rather than fact your car also happens to be way quicker than standard car
Sweeping through left and right hand bends sometimes consecutively on the limit of grip at speeds of over 100mph is not the same as driving down the average dual carriageway/motorway, where i'm sure all the talk/advice of arbs and coilovers is more than enough to make the car 100% better than standard. With you already running all these things I see exactly where you are coming from with running slicks just up front and now wanting to improve the rear a bit in a simple quick way and think what you are looking at makes a lot of sense. The gurney flap idea which i was not aware of does seem a simple inexpensive thing worth trying maybe?

 

[ReDBull]

If I get around to trying a flat floor in the summer which is dependant on or great British weather. And if I can get it to work I'll send you some templates if you want?

 

[Gulfstream]

If I get around to trying a flat floor in the summer which is dependant on or great British weather. And if I can get it to work I'll send you some templates if you want?

Absolutely that'd be sweet. I think with a flat floor you should also think about extending the sideskirts to keep the vacuum under that car and not have it dissipate out to the sides. Same principle as the winglets on a jet. -ish

I'll try to source some kind of a gurney solution locally. Just need to be creative I guess..

 

[wouterwolfs]

Soften your rear damper stiffnes and pull the front about 5mm up.
( I think your understeer is also Aero related, maybe your front is to low!!, because the air stalls at that speed you will get extra understeer! in medium/low speed corners)

Add an adjustable front splitter so you can tweak this.
Make a small diffuser from the point where the rear axlebeam starts to the rear bumper.
( don't but the angel more than 7 degrees up, than the diffuser stalls again!)

Race proved at an Alfa 156 GTA

 

[ReDBull]

Absolutely that'd be sweet. I think with a flat floor you should also think about extending the sideskirts to keep the vacuum under that car and not have it dissipate out to the sides. Same principle as the winglets on a jet. -ish

I'll try to source some kind of a gurney solution locally. Just need to be creative I guess..

I've bough a boot spoiler for a M5 to try but I don't think it'll be high enough in the air stream. I might have a go with a drain pipe and fibreglass like Nige! It's an interesting area that gets over looked.

 

[ibizacupra]

My understanding is if you soften up the rear you'll induce more understeer. The biggest problem I have is a light footprint at the rear at high speed. I'm afraid this is an aerodynamic issue...

I have plenty understeer in medium/low speed corners already so.. don't need more of that

play front rear ride heights

 

[Gulfstream]

I've bough a boot spoiler for a M5 to try but I don't think it'll be high enough in the air stream. I might have a go with a drain pipe and fibreglass like Nige! It's an interesting area that gets over looked.

Yea, mold a gurney flap of fiberglass might be a solution. Bolt on to oem spoiler...

 

[Gulfstream]

play front rear ride heights

She sits like this:



Suggestions are welcome

 

[Gulfstream]

I also found this one:

http://www.realcar.se/product.php?id_product=12840

Don't we have any aerodynamic engineers in here=?