rear underbody diffuser
rear underbody diffuser
if i were to get rid of my spare tire well and put a big underbody spoiler below where it used to be would i get any extra downforce? ive seen it on a few rx-7s near my house. i would do it to my 240 if i got any useable downforce.
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Nismo_Freak
- Posts: 10314
- Joined: Wed Jul 24, 2002 10:42 pm
- Car: 89 Nissan 240SX
tl1000sga wrote:Rear underbody diffusers only help with aerodynamic turbulence and high speed stability, not with down force.
Negative... they cause acceleration of the airflow which causes a vacuum to be formed. Albeit weak compaired to the forces created by open wheel race cars or LeMans cars due to the smaller ground clearances and more intricate designs.
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Nismo_Freak
- Posts: 10314
- Joined: Wed Jul 24, 2002 10:42 pm
- Car: 89 Nissan 240SX
Re: rear underbody diffuser
CrazyS14240 wrote:if i were to get rid of my spare tire well and put a big underbody spoiler below where it used to be would i get any extra downforce? ive seen it on a few rx-7s near my house. i would do it to my 240 if i got any useable downforce.
You'd need to do well over 100mph for something like that to make a worthwhile effect.
i actually did get 120 daily on most weekdays on a short stretch of highway on my way to school. now my top speed govener is taken out and ive gotten it up to around 135 at least.I dont road race yet , but i plan to this summer. I would make sure you could barely see it if i did put it in. would it help going down offramps at like 80,and does it add anywhere near the amount of extra stability a spoiler would, thanks
Actually, the diffuser does make down force. Not as much as an actual GT wing, but probably more than those cheap knock-off aluminum shopping cart handle. . . I mean GT wing. For your car, to be precise, it won't "create" down force. Currently, your car has lift. That's the floaty felling you get when you go near the triple digit zone. What the diffuser will do for you, is reduce lift. It actually IS measurable even at a mere 60mph, but not really noticable unless you're going faster. The design makes a defference, also, but the goal is to organize the air passing under the car, so any kind of flat surface is better than the under carriage of the 240. Have you seen the undercarriage of the R34? Auto designers are taking advantage of the air flow underneath the cars with newer car. Why can't we? I wouldn't suggest getting the carbon fiber rear diffuser that would require you to sell a kidney, but a even a sheet of aluminum (something light weight) to smooth out the bottom of the car would be noticable at going-to-jail-speeds.You can do it to the front end of the car too, in order to balance out the downforce created by rear wings, and rear diffusers.
Unfortunately, I have not found anything specifically for the 240. However, I have found that Importfan has a "Universal" diffuser that "may" work on a 240. I'd be nice if there was a diffuser out for the 240 that was a REASONABLE price. (not that dry carbon fiber stuff that requires you to sell a kidney. . . lol)
karay240 wrote:Unfortunately, I have not found anything specifically for the 240. However, I have found that Importfan has a "Universal" diffuser that "may" work on a 240. I'd be nice if there was a diffuser out for the 240 that was a REASONABLE price. (not that dry carbon fiber stuff that requires you to sell a kidney. . . lol)
bummer, i'd really be interested in some...maybe we have to make our own huh.