My slicktop has been parked up and a bit neglected since late last year.

Prepping and selling my spare slicktop, building a new trackday car and an exciting new house project in Spain have taken up most of my time, energy and money so far this year.

However this week I met up with my buddy Bob Dixon and bought his Volk Racing SE37s complete with some used trackday tyres fitted:thumbup1:

I got them on the car today and Im very happy. This has always been one of my favourite wheels.

I also made a start to fitting the TwinZ rooftop spoiler that Howard kindly imported for me with his Twinz order.

I should get that painted for a final fitting this week.

Pics of today's progress......

 

 

Looking good Pete :thumbup1:

Looking good Pete :thumbup1:

 

Cheers Gary.

I have to wait till end of june to put insurance back on this car.

There are a couple of other jobs to do before then.

I will be out n about in it in time for Coventry.

Cheers Gary.

I have to wait till end of june to put insurance back on this car.

There are a couple of other jobs to do before then.

I will be out n about in it in time for Coventry.

 

Hope to see you at Coventry Pete.

What size are the new wheels Pete? Good to see you getting on with it.

Very nice Pete. Not only do they look great, they’re also one of the lightest and strongest wheels money can buy. Form and function all wrapped up in one awesome package!

Looking good Pete - and certainly hope to see you at Coventry mate...:thumbup:

What size are the new wheels Pete? Good to see you getting on with it.

 

F 8.5" ET40 R 9.5 ET40.

Very similar to my Ultralites that I have taken off.

I have left the 10mm spacers on the front that I had although the Volk clears my Brembo caliper without it.

Another view of the roof spoiler. Even if you didnt really want one.

Its also another opportunity to post a picture of my highly reviled rear light set up.:thumbup:

Apart from keeping crap off the window i wonder if it actually has any true aerodynamic benefit??:whistling:

I was just going to paint it black but now I think I might do it Electric orange colour to match the roof.

 

Maybe I should have one of these dreadful discussion threads that start off like this.......

 

" Im getting a respray soon so I was wandering what colour I should paint it"....tra la la la la... etc:lol:

Have it hydrodipped in orange flaming skulls Pete. I think that would be the most benifit.

Apart from keeping crap off the window i wonder if it actually has any true aerodynamic benefit??:whistling:

I’ll take a nibble at this bait! Being a bit of a specialist subject of mine, I can tell you that it will not have any aerodynamic benefit, in fact it will certainly (theoretically) have a negative effect! All that lovely “Slick”, laminar airflow flowing over your roof is being broken off early, creating more turbulent air and drag off the back of the car which will effectively (indirectly) decrease downforce.

 

Boring jargon: The smooth downward swoop of the tailgate is great for keeping the boundary layer energised and goes someway to slow down the airflow who’s velocity has increased on its journey up the precisely designed front rake angle. Slowing down the airflow is key to break the airflow away cleaner. The ideal situation is to match the airflow velocity off the back end to the same speed as it was before it started to flow over the car, this keeps drag to a minimum which affords the maximum affect of downforce. This is also the job of a diffuser, by creating a divergent duct, it slows down the velocity (diffusion) as much as possible to reduce drag but does however create a pressure increase in the area (essentially pushing the back end of the car up, not good for traction!). Aerofoils help to counter this but more importantly, the action of an under-trays aero specifically at the location of the rear wheels is where “real downforce” is directly created with the convergence of air (increase speed, decrease pressure) to “suck” the car down to the road at the rear wheels. After this point, we want to slow that fast air down again before breaking it away cleanly to minimise the drag vortex.

 

Keeping the boundary layer engerised down the tailgate is something that the saloon cars struggle with as the angle change is often too much for the airflow to follow and it breaks away. Mitsubishi countered this problem on the later Evos by adding vortex generators but I’m not sure how much effect they had in the wind tunnel, needless to say that it became a fashion statement to plaster them all over the back (or anywhere) of the car!

 

How much effect in the real world will likely be negligible but interesting to learn from your fine tuned experience of how the car feels at speed, Pete.

 

Sorry for the long post, I got carried away, there will be several people asleep on there keyboards before they finish reading this!

For reference this picture shows a SWB during wind tunnel development - note the smooth airflow.

 

Joely, love it :biggrin:

 

Could it be paired with a conventional spoiler to bridge the gap over the back window?

 

I bet you could, you could use that little spoiler like a gurney flap and then link it up with a mid level spoiler. But that would aerodynamically make the back of your car the same shape as a porche 944.

Sorry for the long post, I got carried away

 

Absolutley no need to apologise Joel.

Im just as keen to be serious as I am to have a bit of fun.

Like you propose it probably wont have a big effect in any normal circumstances.

A little more downforce would be useful.

 

For reference this picture shows a SWB during wind tunnel development - note the smooth airflow.

 

Thanks for the pic Andrew.

Interesting stuff.

Have it hydrodipped in orange flaming skulls Pete. I think that would be the most benifit.

 

LOL!!!

So now we cqn have some "fun in the sun" and an interesting debate all in one thread.:thumbup1:

For reference this picture shows a SWB during wind tunnel development - note the smooth airflow.

 

[ATTACH=CONFIG]112369[/ATTACH]

 

 

I wonder why they used a SWB without a rear spoiler.

I wonder why they used a SWB without a rear spoiler.

 

Testing was done on both, with a Cd of 0.31 for NA's and 0.32 for spoilered TT's. I don't have a

picture of a TT being tested (nor for that matter 2+2s).

Joely, love it :biggrin:

 

Could it be paired with a conventional spoiler to bridge the gap over the back window?

 

I bet you could, you could use that little spoiler like a gurney flap and then link it up with a mid level spoiler. But that would aerodynamically make the back of your car the same shape as a porche 944.

 

Unfortunately not, once the airflow becomes turbulent, the function of the rear spoiler will be lost.

While I had the paint stuff all set up I decided to refresh the rear bumper lower area.

Years of it sitting outside in the same direction to the elements had oxidised the lacquer a bit.

Ideal dry warm conditions for painting too:thumbup1:

 

Awesome car Pete :thumbup1:

LOL!!!

So now we cqn have some "fun in the sun" and an interesting debate all in one thread.:thumbup1:

 

How about this one Pete? the colour looks stunning. :tt2:

 

How about this one Pete? the colour looks stunning. :tt2:

 

 

The colour IS stunning Howard as is the quality of the finish.

If only I had the facilities and the skill set to produce work like that.

 

Oh well Im finished now and will just have to be happy with my own work.....which I am.

 

But it looks like the Twinz diffuser needs painting now.... :thumbdown:

So that opens up a new can of worms.....

"What colour shall I paint my diffuser??

Maybe I should head over to FB for a quick poll??:lol::lol:

 

Orange may look a bit too much. Like those rover 25 sport things, that had either green or orange highlights all over them.

 

But it might look ace :lol:

Orange may look a bit too much. Like those rover 25 sport things, that had either green or orange highlights all over them.

 

But it might look ace :lol:

 

Name one good thing that only comes in orange? Even Nemo has seen the light.

Edited May 21, 20187 yr by Stephen

The rear end tidy up is now complete. Roof spoiler fitted (for better or for worse??)

I cant get the two screws fitted towards the centre as my arms are too short. They will wait till I have help.

Twinz diffuser just in plain black ATM.

Polished out a couple of runs in the lacquer.

I also tinted the rear/side markers to make them less obvious and less of an eyesore.

Its no good filling the holes in with filler as it will just crack on a urethane type bumper.

The exhaust got a quick clean too. I stopped short of polishing it as Im not that sad/obsessive.

The next job is to see if I can fix a non working speedo.... joy of joys.