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MrDangerUS

REAR DIFFUSER CONCEPT

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I'm looking for styling concepts of rear diffusers. Would it look nice or silly on Esprit?

Please post some pictures/opinions.

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Mine is lightweight aluminum with a factory back finish. I love it.

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Luke Colorado, Super Spy.   -  Lotus Owner No Longer

1987 Zender Widebody 560SEC | 1994 Lotus Esprit S4 | 2013 Honda Fit EV (#269)

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I'll be the weirdo here and say that I think that they look utterly silly on anything other than race-cars.


"If you can't fix it with a hammer, it's electrical." -somebody's dad

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From the GT1 replica project:

grq4_8d3_u6qlh.jpg

grq4_218_u6qlh.jpg

nirc_14a_u6qlh.jpg

1aic_0e6_u6qlh.jpg

Cheers,

Mike S


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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Found one of the diffuser before installation. The part is attached to the chassis and suspended from the boot floor

403y_7bc_u6qlh.jpg


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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The rear diffusers really look nice, but to be efficient, they must be supplied with laminar airflow - otherwise they just add weight.

Make sure, that the car has a pretty straight surface underneath, which mine original G-Turbo hasn't.


The Real Stig Lotus Turbo Esprit, Lotus Elise S1, Lotus Elite, Lancia Delta, Jaguar XF ....Previous cars: Subaru SVX, Porsche 924 Turbo, Lotus Eclat Excel, Lotus Elite, Matra Murena 2,2, Fiat X1/9 5sp

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You are absolutely right - these are purely cosmetic and do would not provide any functional effect / downforce unless you have an integrated flat floor deployed.


1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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interesting that Lotus was the pioneer of the diffuser - > http://www.symscape.com/blog/secrets_of_diffusers

here is an article from 'racecar engineer' where they take an Exige street car and aero tune it for race...

Racecar Engineering- Lotus Exige Aerodynamics.pdf


Lou Senko

Austin, TX

more, more, more....

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The rear diffusers really look nice, but to be efficient, they must be supplied with laminar airflow - otherwise they just add weight.

Make sure, that the car has a pretty straight surface underneath, which mine original G-Turbo hasn't.

You are absolutely right - these are purely cosmetic and do would not provide any functional effect / downforce unless you have an integrated flat floor deployed.

I totally 100% agree , so when i fitted mine i employed the full package..!!!!!

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Impressive - way to go.

A small fin ahead of the openings for the rear suspensions would guide and accellerate air to the diffuser.

Accelerated air will create more vacuum according to Bernoulli.

http://en.wikipedia.org/wiki/Bernoulli's_principle


The Real Stig Lotus Turbo Esprit, Lotus Elise S1, Lotus Elite, Lancia Delta, Jaguar XF ....Previous cars: Subaru SVX, Porsche 924 Turbo, Lotus Eclat Excel, Lotus Elite, Matra Murena 2,2, Fiat X1/9 5sp

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Dave: Those look like some meaty tires in the front! What are you running?


Luke Colorado, Super Spy.   -  Lotus Owner No Longer

1987 Zender Widebody 560SEC | 1994 Lotus Esprit S4 | 2013 Honda Fit EV (#269)

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They're AWI Monoblocs.


88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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lawn1.jpg

I knew something was missing. :sofa:


Life is like a sewer, what you get out of it, depends on what you put into it. (Tom Leahrer)

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TIRES, Bibs, not wheels... you sound like my wife confusing to two. :harhar:


Luke Colorado, Super Spy.   -  Lotus Owner No Longer

1987 Zender Widebody 560SEC | 1994 Lotus Esprit S4 | 2013 Honda Fit EV (#269)

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I'd say Falken FK452 then...


88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. 

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you can not hide anything from the Gov'na , he knows his stuff 10 out of 10.....FK452 They be......

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John J....I hope you meant 0.09" or thicker?!


Scientists investigate that which already is; Engineers create that which has never been." - Albert Einstein

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you can not hide anything from the Gov'na , he knows his stuff 10 out of 10.....FK452 They be......

Yeah, yeah... But 235 or 245?


Luke Colorado, Super Spy.   -  Lotus Owner No Longer

1987 Zender Widebody 560SEC | 1994 Lotus Esprit S4 | 2013 Honda Fit EV (#269)

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Is yours made of 0.90" thick alloy, or thicker?

It is actually 0.075'' anodized aluminium..

Yeah, yeah... But 235 or 245?

235 front 285 rear ,

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I've made my share of diffusers for racecars, and I had a look underneath my car (V8) for the possibility. There's a lot of stuff forward of the engine that will interfere with trying to accelerate the airflow under the car. Another concern is cooling. You'd probably want to add a couple of airjets somewhere under there to help exhaust the hot engine compartment air underneath the diffuser. You'll also get more downforce with hotter air. Lastly, a diffuser really needs to work in "wing in ground effect". The car sits a lot higher off the ground than racecars, which will considerably decrease the downforce. But I think they look cool on the car.

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The general under body as you say has too many undulations to be effective a speeding up the air flow , The floor i fitted to mine removes these and lowers the ground to floor height by 1''... The design of the front radiator outlet created issues as it was not practical to redirect through the bonnet on my road going project. Compensation was made when fixing the rake angle and the rads do provide some warm air to the underside.

The enclosed engine bay does as you say need venting . But i adopted the opposite direction to your suggestion... I fitted NACA ducts to the floor removing air just before the diffuser and directing it into the engine bay... this has the effect (with the help of other aids) to direct the air flow around the engine in a controlled fashion not random.. This semi pressurised air is then exited via the rear top vents behind the canopy and above the diffuser at the rear.. both of these area's are drag zones, so pumping air into them will reduce it ...

The concept for this road car seem to work well , and at higher speeds the benefits can certainly be felt....

Rear exit above diffuser and below bumper......

Dave L

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