29 replies to this topic

[Glambee]

As I read turbo ears were terrible for car aerodynamic, I was thinking about removing them (just to have the N/A mesh instead) after fitting the chargecooler. Does anyone know if this may have an impact on engine cooling, air intake, oil cooling (I run an additional oil rad on the left side)? Nicolas

Edited by Glambee, 11 October 2011 - 12:19 PM.

[fezzasus]

As I read turbo ears were terrible for car aerodynamic, I was thinking about removing them (just to have the N/A mesh instead) after fitting the chargecooler.
Does anyone know if this may have an impact on engine cooling, air intake, oil cooling (I run an additional oil rad on the left side)?

Nicolas

Can I have them?

Honestly, i think it's pretty minimal difference in terms of air induction. If they improved flow that much then everyone with an NA would be fitting them for their air box.

[davemate]

although most people with an sc seem to have them... na- probably not needed but the engine bay does get warm, so getting some fresh in there would really help.

[jonnyboy]

Given that the vx has the aerodynamic qualities of a pork pie I think the ears contribution to that are probably minimal. The need for cooling on the tubby must be there as they have the ears and an additional duct in the undertray too.

[Rosssco]

I presumed the ears were just to feed and leave a bit more space for the tubby intercooler ahead of the rear wheel. And obviously just fitting one on that side would look stoopid...

[ChrisS1]

Given that the vx has the aerodynamic qualities of a pork pie I think the ears contribution to that are probably minimal. The need for cooling on the tubby must be there as they have the ears and an additional duct in the undertray too.

I assume you mean a full pork pie, not a slice...as a slice is far more aerodynamic than any VX.

Perhaps pork pie splitters could be the future...or pork pie clam shells....

[Aerodynamic]

<br />Given that the vx has the aerodynamic qualities of a pork pie I think the ears contribution to that are probably minimal. The need for cooling on the tubby must be there as they have the ears and an additional duct in the undertray too.<br />

<br /><br /><br />

Is the Aerodynamic of the VX really that bad? I thought it was quite good?!
Thinking about a nose that actually creates some downforce and a straight line during the sides insetad of a curved slim waist
as seen on the Elise cars that I understood is not a good thing.

[jonnyboy]

I dont think downforce makes cars go light on the front at 100mph lol

[Nev]

A standard VXT has a CD of 0.41 - which is very poor. In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

Edited by Nev, 11 October 2011 - 06:53 PM.

[Winstar]

A standard VXT has a CD of 0.41 - which is very poor.

In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

not sure where you got that number from it's 0.38 from sport auto clicky

The Tubby ears are just a horrible bodge to allow enough flow for an intercool to be used*. People use them on SC because they have no idea how a cooling system on a car works and think they will make a difference.

To the op the only thing that may be an issue is the air to oil cooler you've got fitted that will need a supply of cool air

* I also suspect that they would have had to redo the crash testing if they fitted a CC rad up front.

[VXT Tim]

I dont think downforce makes cars go light on the front at 100mph lol

That contradicts .....

The figures are: rear downforce closed -186Nm (that's minus 186NM, i.e. 186Nm of lift ), which is reduced to -142NM of lift with the roof off.

But, of course, the drag increases when open, thus reducing topspeed.

The figures (in weight) for the VXT closed (again from Sport Auto measured at 200kmh) are:

Front 23kg downforce
Rear 19kg lift

In comparison, for the Exige S2, they measured:

Front 18kg downforce

Rear 26kg downforce – i.e. 45kg more downforce than the VXT

[MartinS]

I much preferred this conversation when it was getting onto pork pies. I have an sc and I dont have turbo ears (I do however, have a car that keeps getting hot!). Martin s

Edited by MartinS, 12 October 2011 - 07:43 AM.

[Mike (Cliffie)]

A standard VXT has a CD of 0.41 - which is very poor.

In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

not sure where you got that number from it's 0.38 from sport auto clicky

The Tubby ears are just a horrible bodge to allow enough flow for an intercool to be used*. People use them on SC because they have no idea how a cooling system on a car works and think they will make a difference.

To the op the only thing that may be an issue is the air to oil cooler you've got fitted that will need a supply of cool air

* I also suspect that they would have had to redo the crash testing if they fitted a CC rad up front.

People use them on SC'd cars to get more cold air in for the intake, not for cooling and I ran one on the pax side only for nearly two years before the OCD got the better of me.

[Glambee]

A standard VXT has a CD of 0.41 - which is very poor.

In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

not sure where you got that number from it's 0.38 from sport auto clicky

The Tubby ears are just a horrible bodge to allow enough flow for an intercool to be used*. People use them on SC because they have no idea how a cooling system on a car works and think they will make a difference.

To the op the only thing that may be an issue is the air to oil cooler you've got fitted that will need a supply of cool air

* I also suspect that they would have had to redo the crash testing if they fitted a CC rad up front.

People use them on SC'd cars to get more cold air in for the intake, not for cooling and I ran one on the pax side only for nearly two years before the OCD got the better of me.

What is OCD?

[Glambee]

A standard VXT has a CD of 0.41 - which is very poor.

In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

not sure where you got that number from it's 0.38 from sport auto clicky

The Tubby ears are just a horrible bodge to allow enough flow for an intercool to be used*. People use them on SC because they have no idea how a cooling system on a car works and think they will make a difference.

To the op the only thing that may be an issue is the air to oil cooler you've got fitted that will need a supply of cool air

* I also suspect that they would have had to redo the crash testing if they fitted a CC rad up front.

Yeah that was also my opinion. Maybe I could try to make a scoop to direct the air stream to the oil rad.
By the way, someone (Chris from France) told me that the ears dragforce was equivalent to a loss of 7BHP at 130mp/h.

[ArticMonkey]

A standard VXT has a CD of 0.41 - which is very poor.

In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

not sure where you got that number from it's 0.38 from sport auto clicky

The Tubby ears are just a horrible bodge to allow enough flow for an intercool to be used*. People use them on SC because they have no idea how a cooling system on a car works and think they will make a difference.

To the op the only thing that may be an issue is the air to oil cooler you've got fitted that will need a supply of cool air

* I also suspect that they would have had to redo the crash testing if they fitted a CC rad up front.

Yeah that was also my opinion. Maybe I could try to make a scoop to direct the air stream to the oil rad.
By the way, someone (Chris from France) told me that the ears dragforce was equivalent to a loss of 7BHP at 130mp/h.

And how often are you at those speeds? Making sure you have the right amount of fuel and tyre presure will gain you more than what 7bhp will do at 130mph.

[ChrisS1]

OCD = Obsessive Compulsive Disorder

[Aerodynamic]

A standard VXT has a CD of 0.41 - which is very poor.

In its favour however, the frontal area is very small. I did work it out and put it on my website somewhere, but cant remember it ATM.

not sure where you got that number from it's 0.38 from sport auto clicky

The Tubby ears are just a horrible bodge to allow enough flow for an intercool to be used*. People use them on SC because they have no idea how a cooling system on a car works and think they will make a difference.

To the op the only thing that may be an issue is the air to oil cooler you've got fitted that will need a supply of cool air

* I also suspect that they would have had to redo the crash testing if they fitted a CC rad up front.

I wonder how should I cool my car then addins a SC to my car if not using the "ears"
Anyone know the rear downforce of a Elise s2? I don´t feel it´s fair to compare the VX to a Exige S2 (Exige have a big rear wing as std?!)
but with an Elise s2 it´s more fair.

,Per

[Glambee]

By enhancing cooling circuit and putting a charge cooler. These engines are liquid cooled, not air cooled. The amount of heat dissipated by transfer to air is very low compared to the dissipation into liquid.

[Ormes]

Has anybody tried making really big ears? EDIT: I'm sure somebody put ear lobes on their VXT.

Edited by Ormes, 12 October 2011 - 03:51 PM.