problems with wiping my bum?

[weejimmy]

im thinking about going bare arsed but im woried about down force.
im geting a rear diffuser and plan on flat bellying the rest of the underside.
 
but without the spoiler has anyone had any issues with reduced down force as i drive my cars on the limit quiet a lot.
thanks

[interloper393]

if you fit the diffuser and carnards then u shud be fine lol.. touch wood!

[weejimmy]

no canards just diffuser and under tray
touch wood or armco lol

[interloper393]

o your going to die lol.. iv rad things that removing the wing does have a big effect tho bud.

[FD3SNuttah]

i can say first hand it doesnt feel safe at high speeds with no spoiler on.

btw you should wash then wipe!

[goldk28611]

from this post:
http://www.mazdarotaryclub.com/forums/showthread.php?t=48790
DIRECT LINK
"So the aero attachments certainly increase drag - but do they reduce lift as well? After all, that\'s their supposed function! And front lift is indeed reduced, by a massive 38 per cent in fact. That\'s good going, but what about the fitting of the rear spoiler? Well, according to the Mazda data, it made zero difference to rear lift! Yep, zero. You can see why manufacturers are reluctant to widely disperse this sort of data..."

[SmbFD3S]

Yep it\'s true apparantly, the standard spoiler actually makes bugger all difference, so it will feel the same whether it\'s there or not
 
direct link:- http://autospeed.com/cms/A_108677/article.html

[iaint]

I suspect that most of the diffusers for sale are merely cosmetic and will make bugger all difference.  Would be good to find a diffuser that is proven to work in a wind tunnel.

I suspect any diffuser would only really work properly if the whole underside fothe car was looked at to control the airflow.

Big GT wings certainly do work and the mazda stock spoilers are mainly to clean up the airflow at the back (detach from the body to improve MPG) and they look good.

[AtomicRex Racing]

Would be good to find a diffuser that is proven to work

Watch this space :mmmm:mmmm !!!

[nikp]

I suspect that most of the diffusers for sale are merely cosmetic and will make bugger all difference.  Would be good to find a diffuser that is proven to work in a wind tunnel.

I suspect any diffuser would only really work properly if the whole underside fothe car was looked at to control the airflow.

Big GT wings certainly do work and the mazda stock spoilers are mainly to clean up the airflow at the back (detach from the body to improve MPG) and they look good.

Yeah, I agree. A diffuser will make little difference in my opinion. If it did, it would have to be bolted onto the car extremely well, as it would be pulled down by the -ve pressure under the car, and would have to \'pull\' the car down to.

[Lum]

I have no rear wing & a RE-A rear diffuser on my 430bhp FD & have never experianced any high speed stability issue\'s (upto 170 on the clock)!
Not sure if the diffuser atually has any affect although it does run quite a long way under the car, rite past the fuel tank.

[T11MNM]

Can you get gromets to fill the holes left by the spoiler or is it a fill and spray job?

[Bobbit]

you can get grommet but IMO they look funny. Fill and spray looks much smoother

[weejimmy]

yeah fil and spray or it will look worse than before.
im not shure i belive that the standerd spoiler makes no more down force seems a bit sus.
 
and the rex has a massive parachute are in the rear bumper so i think even a home made diffuser would help out a bit.
im planing on fitting a full size undertray fron spliter to diffuser to help.
its just when you find these things out on the road its usualy prety hard to keep it under controll so was after some personal experiences.
 
lum is that cornering fairly hard at 170 or just on straights?
 
i think ill have around 400-450 bhp (find out on the 10th may woo hoo) so will be up at those speeds no doubt.
ta

[T11MNM]

Where are you going to be cornering at 170mph?