74 replies to this topic

[MartinS]

Am I not right in thinking that the vx needs more rear downforce than it does more front, so with a big old splitter like that up front, its going to get light at the rear at speed isnt it regardless of ride heights?

 

Martin S

 

[siztenboots]

must get a serious amount of toe-out if the front is dropping that low at high speed , what springs do you have fitted

[bladerunner1000]

Not too sure on the springs, after having another frustrating look this morning i am pretty certain the fixing point is at fault. I can apply large amounts of pressure to the top of the splitter and have it almost touch the floor. This would explain the car feeling light as the splitter would almost completely block the air from flowing under the car causing it to lift at high speeds? As mentioned previously my fixing point is 145mm back from the front lip, i intend on moving this point forward and strengthening the fixing point with some stainless steel plate. I am sure the Rake angle also plays a part so i intend to sort this out while having the splitter repaired and try again. Cheers for your help guys, much appreciated. If at first you don't succeed...

[robin]

I run normal height on my car and still scrape a few Larger speed bumps so god knows what your car is like. As said get car set up properly first then work out what You need to do, i run my car 120mph plus and never have Problems with my splitter of rattling or moving the fixings us the Important part It definatly makes th Car more positive on the front as without i find the car Goes light.

Edited by robin, 17 March 2014 - 11:50 AM.

[Mike (Cliffie)]

We can spend the next three days debating this and get nowhere. The very best thing you can do is gate the car to Matt Bentley's at Kimbolton and he will get it right for you. I suspect a combination of poorly set up suspension and badly fitted splitter. Ian, you can get downforce on a VX but you need to be committed...

[dw1]

to Cliffie, that will sort it once and for all. In my limited understanding, below 110 it mucks about with the geometry too much which makes handling worse not better.

[Mike (Cliffie)]

It is all about wishbone angles once you go below 110mm and that effects bump etc. Unless you know what you are doing, leave it to the pros.

[V For Vendetta]

What wind tunnel development did robin do with his diffuser? These things are for looks and looks alone.

[danger7]

We can spend the next three days debating this and get nowhere. The very best thing you can do is gate the car to Matt Bentley's at Kimbolton and he will get it right for you. I suspect a combination of poorly set up suspension and badly fitted splitter. Ian, you can get downforce on a VX but you need to be committed...

 

Fair comment Cliffie i know where i am going wrong now then

 

Cheers

Ian

[robin]

What wind tunnel development did robin do with his diffuser? These things are for looks and looks alone.

 

 

yeah i spent £1.2 million on wind tunnel testing and had Mclaren help me work out what was best to make a cup of coffee

with milk first then water or water first then milk. 

 

bit like asking what development testing vauxhall made on the the little turbo splitters....

[V For Vendetta]

QED

[Mike (Cliffie)]

 

We can spend the next three days debating this and get nowhere. The very best thing you can do is gate the car to Matt Bentley's at Kimbolton and he will get it right for you. I suspect a combination of poorly set up suspension and badly fitted splitter. Ian, you can get downforce on a VX but you need to be committed...

 

Fair comment Cliffie i know where i am going wrong now then

 

Cheers

Ian

 

Yup, I was committed in 1987 then again in 1990 and 91... 

[bladerunner1000]

The problem has now been solved, the down force had pulled the central penny washer through the clam.  This probably happened due to the penny washed being under sized and me over tightening the bolt and damaging the fiber glass.  So it is safe to say the Robins splitter is generating a fair amount of down force at higher speeds, i couldn't tell you exactly how much but every little helps.  Cheers, J.

[Andrew aka Stuwy]

Im the worlds shittest driver and I noticed a difference when the splitter was added to my VX

 

either that or I'm a nut job and its all in my head.

 

 

or a bit of both.

 

 

oh look a sausage with my monkey. what its £2.66 past 5pm?

[FLD]

What wind tunnel development did robin do with his diffuser? These things are for looks and looks alone.

 

In contrast where is YOUR evidence that it doesn't work? 

 

Given that Jamies exige has spent a lot of time at mira and has a splitter of vaguely similar style, although not exactly the same, the evidence suggests it will generate downforce.

 

Robin is a good guy and has done a sterling job of his splitter so don't go hurling abuse until you know better.  Perhaps you should post up some of your results for the splitters / wings etc that you have developed.

[rob999]

Doesn't seem too dissimilar to the exige splitters too tbh. What do lotus know eh

[ianrm]

I have 14 stone of downforce on the drivers side of my VX.

[V For Vendetta]

What wind tunnel development did robin do with his diffuser? These things are for looks and looks alone.

  In contrast where is YOUR evidence that it doesn't work?    Given that Jamies exige has spent a lot of time at mira and has a splitter of vaguely similar style, although not exactly the same, the evidence suggests it will generate downforce.   Robin is a good guy and has done a sterling job of his splitter so don't go hurling abuse until you know better.  Perhaps you should post up some of your results for the splitters / wings etc that you have developed.

Ok, first thing, that in any form isn't hurling abuse. That is a question and a reasonable one at that considering this is an aero appendage we are talking about. Just because a splitter on an Exige looks quite like the one in question is completely irrelevant on a car of an entirely different shape. Robins splitter WILL be having an effect on the aero of this car, but unless is has been tested in a wind tunel nobody can tell what effect it is having. An example of how subtle aero is, the original Audi TT killed several people after its launch before Audi had to recall and fit the small wing to help control it at speed. Lotus spent many hours developing the design of the mkI Elise, when it was put in the wind tunnel much to the dismay of JT it was a very unstable shape and it had to undergo many tweeks to the design to get lift under control. Just cos it looks nice means jack. It is not up to you as to what questions I place on a public forum. If Robin has been offended by my question I am sure he is capable of speaking for himself.

[Paulus H]

Oh we are back to that one..... Use a wind tunnel to see how it performs on the road or track..... What next using a rollling road to see how a car accelerates on the road? Sorry guys, I could not help myself.... Kindly, Paul

[FLD]

........ These things are for looks and looks alone.

 

 

 

Robins splitter WILL be having an effect on the aero of this car,.......