Downforce Battery Undertray

[nsxpowered]

FRP $395
CF $495

Shipping around $40.00 in the USA.


it is suppose to mount under the plastic shroud, but didn't have the time to do it for the photo.


Looks very nice with the carbon fiber. The actual metal tray can be removed and we can build a battery box too.

[nsxpowered]

Forgot to mention we have a few (3) ready to ship. Paypal payments are recommended because you can use credit card and it's easier to get your shipping information and payment all under one email.

[Jeff@Carbon6]

Very Nice Peter. I will have to add that to my list. Do you have a frequent flier program?

Will it support the battery weight?

[Q]

I need a second job so I can keep up with you guys!! Great work. One thing, can you explain the attachment points?

[titaniumdave]

PM sent.

[Like007]

PM SEND
Thanks
Igor

[KooLaid]

what does this due to air flow aka cooling?

[DPG]

Has anyone taken the car out for high speeds and felt any type of difference? I know it is probably hard to just tell, but just wanted to ask

[KooLaid]

Cooling anyone??? I was thinking I could use that space to store 2 backpacks maybe, with enough space for cooling left.... Need to cram luggage for a month long trip, military duffle back in trunk crammed with the neccessities of a 1 year old girl, small suitcase above the motor cover, daughter and her recaro car seat front seat, small ice chest on the floor.....

You mean the plate right? The one that covers the bottom of the area where the spare tire is carried? Or is it an actual battery tray? I'm confusing myself...

[goldNSX]

Looks good, cool. Needs vented hood then?

[titaniumdave]

Has anyone received one of these? PayPal' ed funds a couple of weeks ago and have not heard anything...

Peter?

Anyone else?

[nsxpowered]

Hi Dave,
I had problems with the FRP versions, so I will only be selling the CF for now. I will also add ridges on the sides to channel the airflow like the NSX-R version. I will be sending the ridges out when they are done.
Thanks,
Peter

[da3dalus]

Is the idea of this piece to smooth the underbody like a taitec front underbody diffuser would? Any increase in downforce? Any noticeble difference in handling at speeds?

Will it work in conjunction with your rear underbody piece that covers the gas tank portion (dont see why it wouldnt, just thought i would ask)?

Thanks.

[Racerxjling]

Not trying to downplay the product whatsoever but does this restrict the amount of airflow on the backside of the radiator?

Jeff

[nsxpowered]

Jeff,
Great question, yes once this is covered up the restriction for the radiator to vent air will be greatly affected (negatively). This tray should only be used with a vented (reverse vent such as the NSX-R or the JGTC style) hoods. If you get a hood with positive vent it can lead to overheating. The bottomside with the tray will not be covered 100%, but still it will greatly affect the air to flow out from the backside of the radiator (even with the help of the fan).
Thanks,
Peter

[cwood1388]

how about the marga hills hood?

[Wheelman]

Has anyone installed this? Does anyone have instructions how to install this? DF website link for the instructions is not working. Are only the factory bolts used?

[Khajjathefang]

how about the marga hills hood?

MG hood should do best of all, that hole is huge!

[WingZ]

Is there anyway besides the hood to cool the radiator? I really don't want the hood.

[titaniumdave]

Is there anyway besides the hood to cool the radiator? I really don't want the hood.

Don't put an undertray cover on...

Why do you want this on your car is you don't want to have a vented hood??? This part is designed only to work with a vented hood to deliver any benefits to performance.

[titaniumdave]

Has anyone installed this? Does anyone have instructions how to install this? DF website link for the instructions is not working. Are only the factory bolts used?

I installed mine with the stock battery tray bolts, and was not happy with the way it flexed. I put 8 6mm rivnuts in the underside of the chassis and on the bottom of the battery tray. With all the mount points it is quite solid and quiet.

As far as down force, it is hard to say it makes a ton of difference. I think the order of importance is:
1. vented hood
2. then a splitter
3. last is the undertray.

All together it works well as a set.

[WingZ]

Don't put an undertray cover on...

Why do you want this on your car is you don't want to have a vented hood??? This part is designed only to work with a vented hood to deliver any benefits to performance.

I want the downforce the undertray provides , but not really that jazzed about the hood , as I sometimes drive in the rain to track events. Also the tray works w/o the hood ,but the raditor would need the hood for cooling. Some guys have made custom versions and said they haven't had any overheating problems yet. My concern is that at the track there would be overheating problems.

http://www.nsxprime.com/forums/showthread.php?t=71154

[nsxpowered]

WingZ: My opinion is that the vented hood is not as effective in cooling at the OEM design which is underneath the car. For aerodynamics it is better, but for cooling stand point I believe maybe after 8-9 hot laps on a track size of 1:40 min, it may begin to overheat. I have never tested this, but this is just merely an estimate on the opening size and air pressure flow resistance. This is why our plate does not cover 100%, it leaves around 10% opening along with the hood. When getting a hood, the important aspect is the size opening. When I get time I will measure the opening area of the OEM and compare it to the tray.

[WingZ]

WingZ: My opinion is that the vented hood is not as effective in cooling at the OEM design which is underneath the car. For aerodynamics it is better, but for cooling stand point I believe maybe after 8-9 hot laps on a track size of 1:40 min, it may begin to overheat. I have never tested this, but this is just merely an estimate on the opening size and air pressure flow resistance. This is why our plate does not cover 100%, it leaves around 10% opening along with the hood. When getting a hood, the important aspect is the size opening. When I get time I will measure the opening area of the OEM and compare it to the tray.

Yeah pretty much what I was thinking. I also remember the NSX-R overheating in a track video..not cool! Alright I'll be waiting to see your measurements and go from there.

Thanks!

[titaniumdave]

I want the downforce the undertray provides , but not really that jazzed about the hood , as I sometimes drive in the rain to track events. Also the tray works w/o the hood ,but the radiator would need the hood for cooling. Some guys have made custom versions and said they haven't had any overheating problems yet. My concern is that at the track there would be overheating problems.

http://www.nsxprime.com/forums/showthread.php?t=71154

I found the majority of the benefit to come from channeling the air pressure from under the car to over the car. This will have a greater effect to reduce the pressure under the car than smoothing the air flow which is already going under the car. It would be interesting to get real data about how all this stuff works, I only have my experience of trying 3 different approaches and 4 years experience on the track with an NSX.

Everything under the front hood is water proof, so it all gets wet whether you have a hole in the hood or not. I drive mine in the rain with a Dali Banana Boat hole in the hood.

I found my overheating problems went away when I went to a vented hood. The hole in my hood is almost exactly the same area as the duct which feeds the radiator. I think this is important to create enough airflow to make the cooling work. I did not notice any changes when I went to Peter's undertray. I can run my car for 30 minutes straight, in 90+ deg. temps at Thunderhill and have no detectable movement in the temp. gauge. I am running 25% dilution antifreeze with water wetter which makes a big difference in how much heat can be carried away from the motor. This is half the recommended solution but it still is good to below 0 F, which is over kill here in Oregon.