41 replies to this topic

[JimmyJamJerusalem]

Currently on standard turbo splitters. How can I reduce any lift that may effect the front at higher speeds..?

[james141]

Eat more of these:



HTH

[SteveA]

You could always do what Klasen does

http://www.youtube.c...feature=related

21 seconds in.

Edited by SteveA, 24 November 2009 - 10:50 AM.

[Derek J]

What front lift do you get? Do you really get lighter steering and a drop in stability at higher speeds or are your assumptions based on something like more understeer on track through high speed corners? If the latter then I think you would be better to concentrate on analysing what you as a driver are doing for inputs to the car during these corners rather than looking straight at aero.

[VIX]

AFAIK you need to look at the full aero set up of the car including a much larger front splitter (which will probably be unusable on the road), correct rake of the car, suspension, rear wing and possibly vents in the front wheel arches. I haven't got time to look now but you might search out posts by Thorney and barrybethel who did some work on splitters for their race cars. I have no idea how scientific their work was.

[MartinS]

I had the bigger seat leon spoiler (at teast 3 times the area of the originals) on and things did seem to be more planted at speed, but, when I mislaid it at Anglesey!, I tiptoed around a bit for a few laps assuming the front end would be a mess, but very soon was doing the same speeds down that back section (115 plus), so can only assume based on that highly technical study, that they dont do a lot. Martin s

[Mike (Cliffie)]

Need to be huge to make the difference a bit like the rear diffusers.

[JG]

lift that may effect the front at higher speeds

I would get some evidence before adding so called improvements.

I have no spitters and haven't ever really felt a light front end even at 130-140. Although i only ever made it to that once on a french motorway.

the only reason i would fit splitters is to protect the front clam

Edited by JG, 24 November 2009 - 11:37 AM.

[JimmyJamJerusalem]

Just putting the feelers out ahead of my suspension/wing experiments. Sure I will not require them, but hey.

[siztenboots]

really need to know your mech versus aero balance , high speed understeer / instability can also just be worn tyres with toe-out

[rsg]

To create any meaningful reducion in front end lift you need to fit a splitter that protrudes forward of the cars floor plan. The seat Leon front lip (and such like) would only be an air dam and they only work when running very low ground clearance. Way to low to run on the road.

If you look at the TMS race splitter you can see the front lip



Of course you could always mount it like the old Super Tourer BTCC cars where they weren't rigidly mounted in bump on the cars and could rise up over the kerbs when they grounded out

Also as VIX pointed out, you need to consider what happens around the whole car. Reducing front end lift would would most likely increase the lift at the rear of the car

[VIX]

I have no spitters and haven't ever really felt a light front end even at 130-140.

Mine was always light > 100 mph. Turbo splitters and spoiler possibly helped. Lowering the car with Nitrons helped probably more and the car was stable to 120 mph. The car is now a bit higher and some high speed lightness has returned. My belief is that it is the whole aero package which is important and not just one bit of it.

[rsg]

My belief is that it is the whole aero package which is important and not just one bit of it.

Anyone one know how much its cost to hire the MIRA wind tunnel for a few hours???

Edited by rsg, 24 November 2009 - 12:04 PM.

[slindborg]

shed loads of cash lol. as its not simply a few hours... its days/weeks of instrumentation etc blah blah I've noticed that when in very gusty head wind that the front actually dives down at speed.... prehaps that just mine with no exta aero than it left the turnip farm with and the weird witchcraft that my car is.

[rsg]

shed loads of cash lol. as its not simply a few hours... its days/weeks of instrumentation etc blah blah

what instrumentation would you need?? If your just interested with set Clf and Clr figures then its just a case of driving the car in and off you go

[slindborg]

I'm sure youd want all 4 corners to have height detction on them, since you are going into a tunnel with the mega cash it costs (iirc some of the ones we use, ok not automotive but can be used for such, are in the realms of hundreds of K per day :s) How accurate do you want it to be? on a road surface (belt), wind in realtion to speed, wind greater than speed head/tail etc

[VIX]

My belief is that it is the whole aero package which is important and not just one bit of it.

Anyone one know how much its cost to hire the MIRA wind tunnel for a few hours???

Nah! You just need a few Milton Keynes roundabouts mate!

[alanoo]

Better pay for a full 3D Scan of a VX then stick it in a CFD software

[Winstar]

Better pay for a full 3D Scan of a VX then stick it in a CFD software

No probelm, if someone builds me a cad model

[rsg]

Better pay for a full 3D Scan of a VX then stick it in a CFD software

No probelm, if someone builds me a cad model

I know someone with the scanning equipment