greavesy7
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| posted on 4/11/14 at 10:00 PM |
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Advantages of pannels on the bottom of your car ?
I'm just in the middle of a n engine transplant on my gbs zero from a pinto to a zx9r engine. I have the chance to pannel off the bottom of my
car as the engine does not stick past the chassi . What are the advantage of this if any.
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snapper
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| posted on 4/11/14 at 10:11 PM |
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Alledgely a smooth airflow under the car
However you need a rear diffuser to get any downforce
Disadvantage is that the hot air from the radiator has no where to go
IMHO not worth it
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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greavesy7
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| posted on 4/11/14 at 10:39 PM |
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I have got a diffuser but I kind of agree that it's prob not woth it
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mark chandler
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| posted on 4/11/14 at 11:13 PM |
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Top end and economy, leave it open like under the axle fuel tank and you have added two parachutes under your car.
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jwhatley
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| posted on 4/11/14 at 11:15 PM |
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I have one, I noticed a difference in cornering at high speeds on track.
Cooling isn't an issue with mine although I have wide side pods.
Big up side for me is the fact the engine bay stays a lot cleaner!
Mine is fixed on rivnuts, so removing it is a 5 minute job.
IMO, it's worth it for the cost of a bit of aluminium.
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r1_pete
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| posted on 5/11/14 at 08:05 AM |
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Many if not most production cars have under trays fitted now, even my L200 pickup, so there must be a benefit, I'd guess in production car use
its mainly for economy.
If you had some rear facing louvres punched it could help with under bonnet airflow and cooling.
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Doctor Derek Doctors
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| posted on 5/11/14 at 08:29 AM |
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Combined with a diffuser mine creates a large and noticeable amount of downforce, it also acts as a guard when rubbing over kerbs and it's nice
to have a lovely clean engine bay even after a wet Trackday or spinning it through the gravel. As above mines on rivnuts so 5 mins with an Allen key
has the whole underside removed for access.
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Smoking Frog
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| posted on 5/11/14 at 09:51 AM |
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Increase chassis rigidity? Not quite the same benefit as fitting the back to flat-pack furniture but I'm sure it will bring something to the
party.
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mark chandler
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| posted on 5/11/14 at 11:04 AM |
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It's all about the little changes once you have made your car.
Lose 5% weight
Lose 5% drag with underfloor sheeting back to front
Gain 5% more power
It's adds up and is cumulative so above is really 16.5% in total
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Doctor Derek Doctors
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| posted on 5/11/14 at 11:55 AM |
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quote:
Originally posted by Smoking Frog
Increase chassis rigidity?
Forgot to mention that, mine is a single piece of 5251 that runs the entire length of the car and is bolted on at all the node points.
Designer and Supplier of the T89 Designs - Single Seater Locost. Build you own Single Seater Racecar for ~£5k.
Plans and Drawings available, U2U or e-mail for details.
Available Now: The Sports Racer Add-On pack, Build a full bodied Sports Racer for Trackdays, Sprints and Racing.
www.t89.co.uk
www.racecarwings.co.uk
callan@t89.co.uk
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Slimy38
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| posted on 5/11/14 at 12:37 PM |
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quote:
Originally posted by r1_pete
Many if not most production cars have under trays fitted now, even my L200 pickup, so there must be a benefit, I'd guess in production car use
its mainly for economy.
I suspect it's mostly for decoration so the average Joe doesn't see all the 'horrible greasy bits' when they're in a
showroom wanting to buy their new car. Same under the bonnet, I can't remember the last time I saw an engine rather than covers and panels
covering everything.
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Mr Whippy
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| posted on 5/11/14 at 01:26 PM |
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quote:
Originally posted by Slimy38
quote:
Originally posted by r1_pete
Many if not most production cars have under trays fitted now, even my L200 pickup, so there must be a benefit, I'd guess in production car use
its mainly for economy.
I suspect it's mostly for decoration so the average Joe doesn't see all the 'horrible greasy bits' when they're in a
showroom wanting to buy their new car. Same under the bonnet, I can't remember the last time I saw an engine rather than covers and panels
covering everything.
A lot of covers are acoustic too and help cut out high frequency chatter like tappets and diesel rattle.
I left of the bottom engine skirt of the wife’s cmax tdi and it was quite noticeably louder. Even the rubber seal under the back of the bonnet stops a
surprising amount of noise, I take that off in the winter on my bluebird to let hot air from the engine flow over the windscreen to stop the wipers
freezing up.
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nick205
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| posted on 5/11/14 at 02:04 PM |
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Tin top engine covers are there primarily for sound deadening. The engine under trays are there for aerodynamics to aid fuel economy. If you look
under a modern tin top the manufacturer's go to quite a lot of trouble to smooth the airflow under the vehicle. As Mark comments, it's
the cumulative effect of small changes that make the difference.
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Ivan
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| posted on 6/11/14 at 02:09 PM |
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Have read of this - quiet informative.
http://www.autospeed.com/cms/article.html?&A=2159
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