[Mk2] [Turbo] rear diffusers

[Jimbob]

http://www.superstreetonline.com/featur ... _drag_car/

[Harry]

Ok, People should chill on here, lol

The diffuser will do something, full stop. Much like sticking a huge wing on will do something, or putting little canards on the front of a bumper will do something. At the end of the day it is a wing under the car and any air, even if turbulent which flows over it will cause downforce. The qualitive effects of this cannot be guessed at, although my suspision is it will work at very high speeds only, i.e over 70mph officer!

Stick your hand out of the window and it pushes back, turn it a little and you need to apply a slightly upwards force to keep it level, that force may only be slight but it is pushing you and hence the car down by another little bit, so put a big fat surface at the back and it will push a lot harder.

As for veilside and Border they are two companies who pride themselves heavily on aerodynamic improvements through their products, border especially.

Simplistically if little wings don'y make a difference why are they spattered all over F1 cars. Ok before you attack that comment yes they go faster and are a total package and weigh naff all but any wing adds an effect, just be carefull its the right one, and you don't get masses of drag

Jim
BEng (hons)

P.S I think they look cool anyway

Aerodynamics interests myself mostly from doing it and short of the under
body seem to have covered it along with suspension parts to compliment.
The best i can do for now is bring her as close to ground and hope for
some vacume.Trust me when i say aerodynamic tuning is for real as i have taken a stock unit nearly all the way and the diference is remarkable.Take a look and note all the little aerodynamic tuning?
What do you think? Any one with doubts come for a ride!

Now i am not trying to compete or do things just for styling but purely
for excellence in handling with limited resources and ready made Japanese parts also comparing myself with myself.

To some degree can agree that only body parts with out suspension and
other work will not realise the potential full potential of the excersise.


I think of aerodynamics as a boat pushing through water...
where the sides play a vital role too.

[EarL]

Harry, you're more of a picture whore than me...

[Ed]

But a diffuser doesnt work in the same was a wing, the air doesnt push down but sucks, and if that air is extremely turbulent (which is will be) it just wont suck (ooer).

This has already been addressed by Tom Granberg (aka Tomg on MR2OC.com)

He has produced a flat bottom for the MR2 that runs from the front bumper to just before the engine compartment. It replaces the standard underbody panels. This allows the air flow to be smoothed out but still allow air to be sucked up into the engine bay to allow for cooling.

Jef Fazio has installed this to Hyde and has already had the car over 140 or there abouts to test the stability of the panels.

Tom and Jef are currently experimenting with a rear diffuser to compliment the smooth under panels.

I've already purchased the cut file from Tom and just need to get the file to a machine shop so that I can have them made up.

Ed

[Harry]

But a diffuser doesnt work in the same was a wing, the air doesnt push down but sucks, and if that air is extremely turbulent (which is will be) it just wont suck (ooer).

This has already been addressed by Tom Granberg (aka Tomg on MR2OC.com)
He has produced a flat bottom for the MR2 that runs from the front bumper to just before the engine compartment. It replaces the standard underbody panels. This allows the air flow to be smoothed out but still allow air to be sucked up into the engine bay to allow for cooling.
Jef Fazio has installed this to Hyde and has already had the car over 140 or there abouts to test the stability of the panels.
Tom and Jef are currently experimenting with a rear diffuser to compliment the smooth under panels.
I've already purchased the cut file from Tom and just need to get the file to a machine shop so that I can have them made up.
Ed

Great stuff Ed look forward to seeing it produced and fitted out here

Harry, you're more of a picture whore than me...

Who me?

[skinthespin]

Ive seen Hydes underbody, looks like it has lots of potential, i thinka completely flat bottom with a couple of NACA ducts to aid engine cooling would be great, I also have some other things i'd like to try, where is Nathan when you need him?!?!

[RANDOMr2]

just to defend Re-Amemiya, i fairly certain that everything they produce is for performance reasons not for just looks.

in my defence, i never meant for this to turn into a scrap. i was only asking if it had been done before. im going to try and do it as i think it will help with downforce. had my 2 at 130 tuther day (on a track obviously........ ) and the m3 evo in front was gettin away (i did have the roof off so that wouldnt have helped) but it wasnt as stable as my fd was at that speed.

[Century Motorsport]

where is Nathan when you need him?!?!

Im back!!! Sorry, been out the country for a while........

We need to get cracking on this one Simon! Ill pm you

Regards,

Nathan

[RANDOMr2]

ok, well b0llox to the negative comments. i had a free day (after waiting all day for a courier - who decided to tell me at 4:30 they had sent the package back to the supplier!! ) so i got my ar$e in gear and started lining the side mounts up and figuring out what needed to be cut on the diffuser and the side mounts.

the side mounts were screwed to the rear bumper yesterday eveing and speed clips used so the screws wouldnt come undone


as can be seen, a bit of the side mounts had to be cut away so the diffuser would sit properly. I also had to cut away part of the actual diffuser so it wouldnt foul the rims






so i cut away with my trusty dremel

what i had to cut out of the diffuser


so it all fitted 1st time (just held up in place)


L brackets bolted to the diffuser and the standard mr2 diffuser


all bolted up






i think it looks mad!! and it wasnt that hard to modify to fit the mr2's back (i know it looks like it took ages to get it fitted - if you look at the time in the bottom right of the pics - but i had other bits and bobs to sort out so kinda left it for a few hours.) you just need the balls to cut a 150quid piece of fiberlglass . i still have to see what its like at high speeds.

Anyone worried about the exhaust melting the Fiberglass can stop worrying. According to Wikipedia, Fiberlglass has no true melting point but softens up to 2000°C, where it starts to degrade. At 1713°C, most of the molecules can move about freely.


cheers

j

[THE DUKE]

I think i would have lost the grill and angled it a bit. Its looking a tad "halfords" on at the mo

[RANDOMr2]

cant lose the grill, wouldn't have anything to bolt it to, plus it cant go any higher up as the exhaust is there anyway and if the grill was removed there'd be a gap.

what do you mean it looks "halfords"?

also, i took the 2 to work today (its 25miles of mostly twisty road) and cornering at around 60 does seem a bit more stable. dont know if thats my imagination or not (probably)

[THE DUKE]

Well to me it does not look right. Looks like you have sprayed some cardboard black and stuck it on. Im sure with a little more effort you could get it looking sweet.

[RANDOMr2]

feel free to come round and work some magic then bud as its as good as i can get it. if it were angled down at the back more it'd be waaaaay too low and would end up splitting the air thats going under the car in half more, rather than flattening it out.

[RANDOMr2]

can people please post their views as even tho it does help with the cornering - cornering at about 10mph more than i normally do (not putting up incriminating evidence) and it feels totally planted at the rear end! - i dont want to drive around with something that people think "jesus christ What the F*ck is that!?" dont get me wrong, im usually all for 'function over form', but that is quite a bit of form

cheers

j

[Jimbob]

I like it but it doesn't suit the stock car so well. It would look good on a kitted car though

[THE DUKE]

Seriously mate i think its a good idea. I think it just needs a little fine tune as its just looking a little out of place. If i was anygood wih photoshop i'd show you what i mean, but i suck

Im also sure that something along this line would give added pull to the floor.. Play with it a little.. Find a corner out of the way and test speeds with and without it to see what the feel of the car is like

[afennell]

Ok, People should chill on here, lol

Aerodynamics interests myself mostly from doing it and short of the under
body seem to have covered it along with suspension parts to compliment.
The best i can do for now is bring her as close to ground and hope for
some vacume.Trust me when i say aerodynamic tuning is for real as i have taken a stock unit nearly all the way and the diference is remarkable.Take a look and note all the little aerodynamic tuning?
What do you think? Any one with doubts come for a ride!

Now i am not trying to compete or do things just for styling but purely
for excellence in handling with limited resources and ready made Japanese parts also comparing myself with myself.

To some degree can agree that only body parts with out suspension and
other work will not realise the potential full potential of the excersise.


I think of aerodynamics as a boat pushing through water...
where the sides play a vital role too.

Does that mean you will be able to keep up with me on a roundabout near JAE this year.

Car looking great, few things done in the last year Harry.

RandoMr2 - Each to their own, if you like the rear splitter that's all that matters. I'd get one if there was one for the mr2.

[RANDOMr2]

Each to their own, if you like the rear splitter that's all that matters. I'd get one if there was one for the mr2.

i can make you one to fit the mr2 haha

duke, ive driven the road i said about in the mr2 nearly every day for the past month and a bit, and i swear its quicker cornering with the diffuser, but i may take it off and try it, and if you dont hear from me again, its cuz ive gone off one of the cliff edges sideways

and to jimbob, me and another mate were saying that this evening about with a kit it'd look better (his words were, "its lairy from the front" - with regards to lookin cool, with the new clear lenses and tinted toblerones "and fookin apesh*t at the back but the middle is boggo"). good job i have a border kit on the way i guess

j

[THE DUKE]

Cool, would love to know if you feel a difference without it

[redeye32uk]

Would lov something like that for mine but with the Blitz Nur Spec on theres no way it would fit