4722 replies to this topic

[manus]

"Fit a big adjustable rear aerofoil." Adjustable while driving, something like this: "http://aeromotions.com/products/"?
Will you improve the unsprung weight as well? Alu uprights?

Edited by manus, 16 December 2011 - 11:58 PM.

[Wolfstone]

I see you're replacing the front clam. Will you be selling the original? Should be easy to shift.

I believe he won't be selling his front clam

Seems a hell of a spare to keep

Come on Nev, what's the plan with the old clam? If this time last year is anything to go by, it would be in demand from those that cull theirs.

Edited by Wolfstone, 17 December 2011 - 11:22 AM.

[The Batman]

1. clam

• With deep integral splitter
• Wheel arch vents (to evacuate positive air pressure in the wheel arches).
• Side arch vents (to evacuate positive air pressure in the wheel arches)
• Will allow upto 255 mm width front tyres

hi, so do you have wind tunnel information and cad designs to show your workings on how you know this is what will happen?


3. Fit wide rear wheel arches.

• These will allow far wider tyres on the rear of the car. Hopefully at least 255mm width, perhaps more.
• Cut outs to help evacuate positive air pressure out of the arches.

5. Fit a big adjustable rear aerofoil.

• Has to be adjustable (to fiddle about with it over time).

same, would love to see your air tunnel info

next you will be saying you want a rear wing


also may have a buyer for your front clam if you are selling it?

Edited by joe_589, 17 December 2011 - 06:19 PM.

[vocky]

I see you're replacing the front clam. Will you be selling the original? Should be easy to shift.

I believe he won't be selling his front clam

Seems a hell of a spare to keep

Come on Nev, what's the plan with the old clam? If this time last year is anything to go by, it would be in demand from those that cull theirs.

why do you know someone who needs one

[Wolfstone]

Come on Nev, what's the plan with the old clam? If this time last year is anything to go by, it would be in demand from those that cull theirs.

why do you know someone who needs one

Its not me, that's for sure.

Edited by Wolfstone, 18 December 2011 - 11:14 AM.

[siztenboots]

I notice you have the GTX3071, and wondered how this compared to the GTX2867 both comp maps http://www.atpturbo....TX3071Rcomp.jpg http://www.atpturbo....6366-1_comp.jpg

[Nev]

I notice you have the GTX3071, and wondered how this compared to the GTX2867

both comp maps
http://www.atpturbo....TX3071Rcomp.jpg
http://www.atpturbo....6366-1_comp.jpg

If I had my choice again, I'd now opt for the smaller GTX2867. The reasons are:

1. The smaller turbo would in theory spool faster.
2. I am currently only using 1.35 Bar of boost to make 500 BHP, so I am only using the bigger turbo to approx 50% of it's capacity!

I think the GTX2867 would easily make 450 BHP (on my engine) and quite possibly 480 BHP. However, it will run out of puff a lot sooner in the rev range, so any engine employing it would likely only need to rev to around 7000 revs. Id say the smaller turbo is emminently right for a VX, not too big and not too small. On the down side you would need to run more boost on the smaller turbo and probably have to run slightly more torque than I am, which would push your clutch and gearbox over the limit quite possibly.

Edited by Nev, 03 January 2012 - 06:57 PM.

[Nev]

Things are rumbing on with phase II of Nippers little life. He is now sitting at a friends bodyshop waiting for the clam and body kit to arrive imminently. In the meantime I am trying to select a suitable wing for the rear. Doing this is not as easy at it appears, as foremost I want the wing to be functional, rather than just a pretty adornment. There seem to be 3 main contenders:

Elise Parts Wing, as installed by Joe on here.
Width = 1500mm, depth = 250mm, chord ratio=Unknown, pylon height=adjustable 200mm to 300mm, 4Kg, 3 point adjustable rake angle. Price £670 (inc upper pylons). This unit would need lower pylons to be fabricated and installed to transfer the load on the rear chassis. Looks a half decent thing, however it is quite narrow so would need a high rake angle to be effective which would in turn use quite a bit of power.

JapSpeed Wing, Link here.
Width=1760mm (would require reducing), depth = 280mm, chord ratio=Unknown, pylon height=adjustable 390mm to 480mm, 4Kg, 3 point adjustable rake angle. Price £350 (inc upper pylons). This unit would also need lower pylons to be fabricated and installed to transfer the load on the rear chassis.It is unproven in all ways to me, but is way cheaper than above and is both wider and deeper than above.

MVS Wing. Pics Here.
Width=Bespoke to my spec, depth=300mm or 400mm, chord ratio=10:1, pylon height=bespoke to my spec, 4Kg, 3 or 4 point adjustable rake angle. Price £600 (inc upper and lower pylons and fitting). This item could have a MASSIVE 40cm depth and also be placed way up high to get good air. Hence I think it is likely to be the best functionally and also works out fairly cheap too as it includes the lower pylons and fitting.

Any comments or suggestions anyone?

[The Batman]

wind tunnel time

[Zoobeef]

The noble rear wing doesnt have to lower supports but is perfectly functionable. Even for blokes that have raised to to double its height to be in the clean air. And as the manual says you use the wing to open the rear clam so doesnt mind being pulled. Is the clam just stronger or something?

[The Batman]

I wouldn't suggest bolting the spoiler to the clam, much prefer going straight to the subframe as the clam flexes. Oh and the eliseparts spoiler can be raised to whatever height you want depending on the mounts you decide to buy

[FLD]

All the MVS wings are straight. A curved wing is a whole different kettle of fish to make. Their lamination is excellent but the finish is often a bit minimal. make sure you get exactly what you want there.

[Nev]

If I were a millionaire I'd buy some wind tunnel time

As for the Noble, maybe your clam is really strong at the rear Mark, so can thus take the force. However, I don't want to risk my clam being crushed and breaking at high speed, if it did and the wing came off it would totally de-stabilise the car and probably end up in an accident. I know of 2 incidences where this has happened, one of which was on an Ultima doing (a data-logged) 150 MPH and the guy went into a concrete wall with inevitable consequences.

Bear in mind IF all these mods work and the car feels more planted I may be tempted to raise the boost to make closer to 600 BHP and with that sort of power the car would excede the 200 MPH barrier where the forces that act on the wing may be in the hundreds of KGs. Can you imagine laying 3 fully grown blokes on the rear of a VX clam with the weight pressing down onto 2 fairly small areas the size of a small ruler?

[Nev]

All the MVS wings are straight. A curved wing is a whole different kettle of fish to make. Their lamination is excellent but the finish is often a bit minimal. make sure you get exactly what you want there.

The wings are deffo not straight if I understand you correctly Matt. Pics here. To me that looks like a very nice profile.

[The Batman]

That's why you go down to subframe and sacrifice boot space As you say the clam is weak and it flexes so isn't ideal at all

[Nev]

I wouldn't suggest bolting the spoiler to the clam, much prefer going straight to the subframe as the clam flexes.

Oh and the eliseparts spoiler can be raised to whatever height you want depending on the mounts you decide to buy

Oh, I didn't know that Joe, when I rang Elise Parts up the other day, they only talked about a single set of pylons that had 10 different heights (with 1 CM intervals), with a max height of approx 30cm. These ones here, did you get a different set of pylons from them or someone else?

[luke.]

You gotta learn how to keep it in a straight line @ 40mph first Neville. What happened last time you said you would tow me and chris to 150mph God forbid that happens again. As long as you don't crash into me at brunters

[FLD]

All the MVS wings are straight. A curved wing is a whole different kettle of fish to make. Their lamination is excellent but the finish is often a bit minimal. make sure you get exactly what you want there.

The wings are deffo not straight if I understand you correctly Matt. Pics here. To me that looks like a very nice profile.

I wasn't meaning along the just the section I was meaning a compound style curve along both section and the width of the car.
Curved like this:

[The Batman]

I used there pylons matched with another set and made some brackets I will see what photos I have:

Here was a mock up:



This uses the existing exhaust box rivnuts

And here is it with clam on:



Hopefully you get the idea. I will see if I can get some better photos this week sometime but got alot on so probably be Saturday!

The wing doesn't move at all unless you push down on it which moves the subframe

[FLD]

This uses the existing exhaust box rivnuts

The wing doesn't move at all unless you push down on it which moves the subframe

You may need to strengthen the subframe if its likely to be under a large load. Its pretty feeble around the ends where the exhaust hangs. You may want to go forwards as well to pick up the bolt that holds the clam on. The subframe is boxed in there so is a bit sturdier.