Just out of curiosity. Has anyone in the US or in Europe installed or fabricated a Diffuser for their Gen6?
We've fitted a universal Diffuser to our GT-Four however looking at re-designing a Celica specific due to its low tank.

I've been thinking about doing this, but have yet to actually fabricate one since my car is not at that stage yet. I'd be very interested to see what you come up with.

well we've fabricated a universalone which is very effective to improve air flow. However the GT four has a low down tank and is not in line with the bumper so brackets to maintain a 11 degree slope is necessary for maximum air flow efficiency.




On a normal non GT four Celica it should fit flush because it downt have a low tank and should look a little bit like this:


We've sold many to Silvia owners already as it's a univeral diffuser.

This post has been edited by yellowchinaman: Aug 28, 2009 - 9:17 AM

what are the benefits?

To diffuse air flow.

the aerodinamics of a car are important over and under the car, a smooth flat surface would be the best thing for the underbody, that way the air travels underneath without turbulance or drag, thus improving handling, and overall driving. a difuser helps to get the air to come out easier from the underbody,, most facorty rear bumpers at as a parachute, trapping air.

What a underbody panel does with an inclusive rear diffuser is simple physics.


smoother and less turbulence means the air moves faster under the car than the air over the car. This creates a LOW pressure zone under the vehicle and a High pressure zone (slower moving air) above the vehicle. These pressure zones give down force to the car. The more down force you have the better you perform.

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On a celica, none besides looking cool.

OH MY GOD! You guys are amazing. Everyones logic is dead on and I couldnt explain it any better.
We've has many cocks going on about down force from the diffuser alone and bragging their knowledge of rocket science trying to put us down acting like they know it all.

Truth is this alone doesnt do that much. The car we're building just had coil overs on and now lowered. We're making a front splitter and skirts and under tray to complete the set.

However this does greatly improve the air flow from the GT4 because there is alot of drag under the rear bumper of the GT4.

This post has been edited by yellowchinaman: Aug 28, 2009 - 3:28 PM

Every little bit of function counts.

I condone these actions and efforts.

This post has been edited by playr158: Aug 28, 2009 - 2:52 PM

Diffusers are very effective to the aerodynamics of the car, the air need to flow under car as much over car, high wing helps to keep the car in the ground, diffuser makes help to to improve response.

if can have one of those I definitely have it on my car, the only difference will be that I'll try to make it wide as the back of the car

Find a way to utilize OEM bolt locations and you'll have a winner. I'm not too interested if it involves riveting it through the car.

im looking at it as extra added weight..

if anyone decided to mass produce ill be in a group buy for sure. (front or rear)

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Basically we for te GT4 it needs to cover from the tank to the bumper. If we made a wide one from the tank to the bumper, the rear arms get in the way. 1 Way to obercome this is by having jsut the middle from tank to bumper and the ends extended abit likea T shape. However in doing so you end up making a massive scoop on the ends where trapped wind becomes a drag eleminating the entire idea.

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As the GT4 was a rally car it never intended to have a diffuser and undercar airdynamics wasnt really something they considered too well.

The two end brackets are bolted to the OEM under bumper bolts and only the tank under guard needs drilling to mount the front part of the diffuser. No big deal and it doesnt cause any strain to what its attached to.



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Made of 2x2 twill carbon fibre. Weighs less then 5KG.

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Not that I'm trying to put in the sales but we're already mass producing them and selling it in other forums and on our website.


Back to the origional post. Has anyone every tried making one apart from us because I'd like to compare findings and see if we can a make GT4 specific one.

if you make a gtfour specific one hit me up because im a definate buyer.

As a matter of interest is it any more stable at high speeds?

This post has been edited by Cuts_the_Pilot: Aug 31, 2009 - 6:00 PM

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It does feel alot smoother at high speeds. I went up to 130mph and there is alow less sway how ever we did just change to coil overs too so. For sure there is less noise in the rear though.

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x2

so basically add a diffuser on the bottom of my car and if i go fast enough i can create lift and fly? , anyone add jet engines on their celica yet, that big trd wing has to be used for flight stability right, am i right?

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a diffuser creates downforce....which is the OPPOSITE as lift.
and stop being a retard and cluttering one of the FEW good threads on this forum

What a diffuser did for my car, lol, sorry dan you asked for it, love ya buddy

I really like the idea, and the one you have looks REALLY clean.

However with that said, I don't take my car above 110 (or really, above 85 most of the time). Even the stock GT engine will only get you up to 120. I would understand a little bit more if we were achieving speeds of 150+, but I don't think our cars have enough power to really use this to their advantage.

However, it does look really sweet. I'm glad someone did it, I just wouldn't find it as practical as it should be (for me at least).

-TC

^^ another reason (appart from the tank issue why he is talking gtfour specific^^

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Actually you dont have to go high speeds to benefit a diffuser. At average speeds of around 30-40mph when I fallowed this car in the rain, one obvious thing we noticed was the way the air reacted in the air.
The rain water was being lifted and blown out the back smoothly like line of haze. (Difficult to explain) where as before whendriving in the rain, when lookingin the rear view mirrir, you just see massive sworls of rain being flicked up.
This has improved the airodynamics of the bottom rear of the car reducing alot of drag. This means is should help improve your MPG as we've noticed last weekend during motorway driving.

If you look at new cars like the toyota prius, they too have a simple diffuser in the rear to do the same job to improve fuel efficiency.
And if you have a low down car with fron splitters, and side skirts, you dont need to go fast to get the Venturi Effect which creates the down force.

http://refraction.co.uk/blog/2009/05/03/so...-for-an-f1-car/


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No particular reason. TBH we're quite happy with this universal one. It's proven to be effective on track with other cars already and it does the job. however it's not the most visually appealing and I'm curious if anyone else has tackled this challenge for the GT4.
The GT4 isnt the only car which has the same like a highbumper and low tank. The RX7's also use brackets to mount it's diffusers and it works better as a under car spoiler with the gap.
If this diffuser is fitted to a non GT4 6G, it'll sit flush to the bumper and looks alot better then the GT4.

How much will they be?

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They're £160 plus postage. You're in newcastle so it should be £15 postage.

Are the bonnet vents ready yet? as I may get them all at the same time...
Are the diffusers ready to ship? JAE is close

This post has been edited by Driveby: Sep 2, 2009 - 1:37 PM

edit: nvm i'm totally thinking the wrong way,

but extended out to the edges of the car on the bottom side of the exhaust like FDs?
and It might be more of a bumper fix than a diffuser fix.

This post has been edited by playr158: Sep 2, 2009 - 1:41 PM

i want one bu i dont own the gas tank protector and for some reason i think my tanks hangs lowers than stock so it may be a no go for me but we will see

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I'd be worried if you didnt have a tank protector.
I'd be even more worried if your tank hangs lower then normal GT4's do too because they're already really low!