Full Flat Undertray DIY
#76
Built Not Bought
iTrader: (14)
The last thing this forum needs is more dicks.
Also. We are in 2019, calling someone a school girl is pretty gender insensitive. But I'll stop there before we get into politics haha.
Also, moderators are here to moderate. Not to be dicks. Maybe consider not being a mod if you feel strongly about being a dick.
Also. We are in 2019, calling someone a school girl is pretty gender insensitive. But I'll stop there before we get into politics haha.
Also, moderators are here to moderate. Not to be dicks. Maybe consider not being a mod if you feel strongly about being a dick.
Last edited by TwinCharged RX7; 02-04-19 at 03:22 PM.
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#78
Urban Combat Vet
iTrader: (16)
^
I read that and thought the same thing.
That said, I think the the OP has done something pretty cool. I have questions but not about if it has aero benefit at speed. I don’t look at a tire and ask if it’ll roll. But I do look at it and ask if it’s appropriate and cost-effective for MY use of the car. In my case the full under-tray is probably not.
I read that and thought the same thing.
That said, I think the the OP has done something pretty cool. I have questions but not about if it has aero benefit at speed. I don’t look at a tire and ask if it’ll roll. But I do look at it and ask if it’s appropriate and cost-effective for MY use of the car. In my case the full under-tray is probably not.
Last edited by Sgtblue; 02-04-19 at 06:46 PM.
The following 2 users liked this post by Montego:
Nakd n Fearless (07-24-19),
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#82
43 yrs of driving My 7's
iTrader: (1)
I want to stay above the fray, but I do have a legitimate question since I don't know a lot about undertrays other than what I have read through the years( which is quite little to be honest). It would seem to me using logic that ours cars put out much more heat through our exhaust system than most piston engines, barring true race cars and many high HP street pistons with NO2. If any full undertray traps that much heat between the tray and the car floor and all the intervening components including the trans, drive shaft, U-joints, etc., that cannot be good long term. It would be like putting these things in an oven, particularly in hot climates, and baking them for hours on end. Am I missing something here, if I am please enlighten me.
Mike
Mike
#83
Built Not Bought
iTrader: (14)
You definitely want proper ducting in the engine bay, including the hood. Although I imagine that if you are at speed, enough "cool" air (even if being heated by the radiator and intercooler, but still cooler than the heat coming off the turbos and downpipe) somehow makes it way out of the engine bay through the trans tunnel area (if a flat bottom restricts it to that area.
With or without a flat bottom, a properly ducted system, incorporating a vented hood will help mitigate under hood temps.
With or without a flat bottom, a properly ducted system, incorporating a vented hood will help mitigate under hood temps.
#84
43 yrs of driving My 7's
iTrader: (1)
I am talking about the entire area from under hood, to the mid body region and all the way on back. It seems to me as an analogy is that if you seal a metal box on all sides and then put a fire in it, the contents get pretty much cooked to a crisp in very short order, i.e. a barbecue but we are not cooking food in this case. I just don't get it.
Mike
Mike
Last edited by mikejokich; 02-04-19 at 11:47 PM. Reason: grammar
#85
Built Not Bought
iTrader: (14)
It's not really sealed. Air will move through the tranny tunnel to the back of the car. It will also escape other areas. Cabin air temps may increase. If it was really sealed and prevented flow from entering the engine bay, I think you'd feel it when driving.
It's also not insulated like an oven.
It's also not insulated like an oven.
#86
Rotary Motoring
iTrader: (9)
If any full undertray traps that much heat between the tray and the car floor and all the intervening components including the trans, drive shaft, U-joints, etc., that cannot be good long term. It would be like putting these things in an oven, particularly in hot climates, and baking them for hours on end. Am I missing something here, if I am please enlighten me.
Mike
Mike
You just have to weigh whether it is worth the added stress for lowering the lap times and take care to duct hose from your NACA ducts to the most critical components.
Its also going to be harder to put out a fire from common race situations like transmission rear seal, diff axle seal or even the vent failing and dumping oil onto the exhaust.
Another downside is occasionally cars with full flat bottoms take flight.
#87
Urban Combat Vet
iTrader: (16)
I wondered about heat. Also about noise from vibration and noise that might be reflected from the exhaust and drive-train, ease of access, and the inability for me to just visually check stuff when it’s on the lift for maintenance since it’s mostly a street-driven car.
Yeah, those old bastards probably still hold doors open for women and think “manly” and “lady-like” are valid descriptors. But what can you expect from “old guys just being old guys” when they never got participation trophies as kids. haha
Last edited by Sgtblue; 02-05-19 at 06:13 AM.
#88
Penis Healthy
iTrader: (5)
Join Date: Jul 2013
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This. Why do good threads always turn into a pissing match?
Last edited by FührerTüner; 02-05-19 at 08:20 AM.
#89
Rotor or no motor
iTrader: (24)
I don't and never will copy someone else's work but if the OP wants to work out a deal i do have the capability and capacity to produce them as a "job-shop" .
As for getting one for my self it will be a major task to ship it half way around the globe .. My car is not here in NJ with me lol
Last edited by R-R-Rx7; 02-05-19 at 08:10 AM.
#90
Rotary Freak
Whole thread seems to be a rehash of the Atomic Rex thing from 10 years or more ago.
If you think a flat floor (or the usual japanese diffuser) on a car with road car ride height will make a difference - other than add heat and make access more difficult - you're furiously abusing your old fella!
If you think a flat floor (or the usual japanese diffuser) on a car with road car ride height will make a difference - other than add heat and make access more difficult - you're furiously abusing your old fella!
#92
Junior Member
Thread Starter
I'd like to explain a few things.
1. NACA duct & many louvers has been placed as showen in figure for cooling of center tunnels and exhaust lines
2. louver's angle was adjusted by the user.
3. aftermarket brace(ex; autoexe) was cannot be used together or will require mod.
4. under panel was placed above the front subframe. therefore lowest ride height was front subframe.
5. for maintenance, front & rear central panel can be separated easily.
thank you for opinions for improvement.
Jin.
Last edited by Jin-74; 02-06-19 at 11:16 AM.
#95
Instrument Of G0D.
iTrader: (1)
Id imagine some gussetting in critical areas would be fairly necessary anyway, and could be done in such a way the flat bottom itself lends a fair bit of rigidity to the chassis.
a bit like when building a house with a truss frame roof, the trusses by themselves seem flimsy but as soon as it has the plaster (drywall?) which is also very flimsy, screwed on (let alone the roof sheets) it becomes incredibly stiff and rigid.
a bit like when building a house with a truss frame roof, the trusses by themselves seem flimsy but as soon as it has the plaster (drywall?) which is also very flimsy, screwed on (let alone the roof sheets) it becomes incredibly stiff and rigid.
#96
Junior Member
Thread Starter
hi there~
I don't know if it's okay to advertise here. I'm ready for online sales.
The final mass-production type undertray can be ordered on the following web page.
https://www.wankelgarage.com/product...flat-undertray
If you are interested, please visit my homepage.
thanks~
I don't know if it's okay to advertise here. I'm ready for online sales.
The final mass-production type undertray can be ordered on the following web page.
https://www.wankelgarage.com/product...flat-undertray
If you are interested, please visit my homepage.
thanks~
#97
Form > Function
iTrader: (108)
What's the difference between the Type-A and Type-B when you choose "No' Exhaust Line Cutting?
EDIT: Ahhhh - I see. With a set of vents or not near the downpipe.
Also, you say "Applicable only to vehicles with a RE-amemiya rear diffuser" ... RE-A Race or Street? I think you need to specify so people know...
EDIT: Ahhhh - I see. With a set of vents or not near the downpipe.
Also, you say "Applicable only to vehicles with a RE-amemiya rear diffuser" ... RE-A Race or Street? I think you need to specify so people know...
Last edited by MattGold; 02-26-19 at 03:49 PM.
#98
Junior Member
Thread Starter
What's the difference between the Type-A and Type-B when you choose "No' Exhaust Line Cutting?
EDIT: Ahhhh - I see. With a set of vents or not near the downpipe.
Also, you say "Applicable only to vehicles with a RE-amemiya rear diffuser" ... RE-A Race or Street? I think you need to specify so people know...
EDIT: Ahhhh - I see. With a set of vents or not near the downpipe.
Also, you say "Applicable only to vehicles with a RE-amemiya rear diffuser" ... RE-A Race or Street? I think you need to specify so people know...
https://www.rhdjapan.com/re-amemiya-...rbon-fc3s.html