41 replies to this topic

[Firthy]

Hi Vxers,

 

Based on Arno's advice of more air flow on to the charge cooler and rad through the front grill I carried out this mod yesterday with clippers what do you think?

 

Track day at Oulton of Friday should be a good test Have added some more holes since the pic. (not many) the grill still feels solid which is great.

 

It will get a lick of pain this evening

 

 

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Edited by Firthy, 25 July 2018 - 01:08 PM.

[slindborg]

I think that will do sweet fcuk all to alter the cooling, but then again I'm a grumpy shite.

 

 

looks pretty/shot with an airgun though

[Firthy]

I think that will do sweet fcuk all to alter the cooling, but then again I'm a grumpy shite.

 

 

looks pretty/shot with an airgun though

 

 

Hahaha no doubt you are correct, the hope was that it might let a little more air past..... perhaps not though

 

Looks better in person..... less air gunned as you put it

Edited by Firthy, 25 July 2018 - 01:12 PM.

[smiley]

Ah, the grill that is no longer available.

Well done.

 

[Firthy]

Ah, the grill that is no longer available.

Well done.

 

Its a piece of mesh I'm sure I have seen it down at Halfords, not the end of the world!!

 

It's a track car at the end of the day, just hoped it would increase the air flow.

Edited by Firthy, 25 July 2018 - 01:22 PM.

[Firthy]

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Doesn't look too bad

[smiley]

Did you already patch up the gaps you see when you lift the front bonnet?
The gaps between the radiator surrounding, and the radiator, so all air is forced through the radiator.

I think that will help a bit more.

 

[siztenboots]

you need a small lip wing on the front bonnet cover to make a big low pressure zone to make the rads, high pressure intake, low pressure exhaust

 

[Firthy]

Got both of those front lip and patched all around the rads

 

 

[Duncan VXR]

Remove V also?

Long time since looking at the science embraced on the hoffman car from Winstar but gave some good results on the race car

[chris_uk]

you need a small lip wing on the front bonnet cover to make a big low pressure zone to make the rads, high pressure intake, low pressure exhaust

 

 

yup, a gurney flap on the front edge of the bonnet or vents will make a good difference to the cooling. it doesnt have to be big either, 5mm protruding will do it.

[oblomov]

Remove V also?

Long time since looking at the science embraced on the hoffman car from Winstar but gave some good results on the race car

Agree, if you look at the grille aperture it's obvious by a mile that that the V offers the largest area of air flow restriction. However on a car for general use 'nothing' at the front looks very naff. It looks as if something is missing.

[Pipo]

Agree, if you look at the grille aperture it's obvious by a mile that that the V offers the largest area of air flow restriction. However on a car for general use 'nothing' at the front looks very naff. It looks as if something is missing.

 

 

You could mount a single logo mounted in the centre like the LHD Opel Speedster Turbo has.  Gives a clean look And more flow.
 

[Winstar]

Remove V also?

Long time since looking at the science embraced on the hoffman car from Winstar but gave some good results on the race car

That was quite a while ago! it is essentially using the venturi effect to draw more flow through the radiator section.

I have to say it irritates me when I see it described as a gurney flap as this is a completely different phenomenon and using one for this is actually a really inefficient way to achieve the effect.

Edit I should add the original idea was to use a slightly modified flexible coving to flick the air flow up with minimal drag

Edited by Winstar, 25 July 2018 - 09:24 PM.

[Firthy]

Hi Winstar,

Would you say that the holes would increase airflow at all or a complete waste of time?

On your previous advice I have the lip in front of the rad already which I do believe has helped quite a bit.

Firthy

[Firthy]

Oh and would you agree with Arno that the standard mesh is restrictive? 😃

Would be great to know your thoughts !

[Steve.i.am]

I asked about this before:

http://www.vx220.org...an-removal-etc/

[Bargi]

Hi Winstar,

Would you say that the holes would increase airflow at all or a complete waste of time?

On your previous advice I have the lip in front of the rad already which I do believe has helped quite a bit.

Firthy

 

 

what did you use for it and how did you attach it?

[smiley]

As in the already linked discussion on flow, I read on the German forum the same discussion.

They also seem to conclude that the full pro alloy SC rad is blocking to much, versus a large oil cooler standing up straight in the crashbox., leaving airflow around it to go through the regular radiator only.

[Firthy]

Bargi,

 

Here is how I made the front lip.

 

Incidentally the car did great at Alton in 28 degrees, held temperature brilliantly yes it did get hot but it took many laps to do so. Must be the grill

 

Interestingly taking the number plate off had an enormous impact!

 

90 degree plastic like so.

 

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Cut a bit of the end so it can flex around, also made small cuts to allow the bottom half to curve. This photo doesn't show the small cuts,,

 

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Stick the underside plastic to the edge of the bonnet (I used velcro) then carefully close it.... jobs a carrot

 

Yes and I know it doesn't look great but again I don't care. 

 

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Edited by Firthy, 29 July 2018 - 04:33 PM.