What Speeds can a Rear Diffuser handle?
Thread Starter
Lexus Test Driver
Joined: May 2011
Posts: 1,054
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From: va
What Speeds can a Rear Diffuser handle?
I am thinking about getting a rear diffuser but i know they are held on by 3m tape. That being said how fast can you go before the thing just flies off the back?
So for those of you with rear diffusers what is the fastest you have gone and what do you think they can handle?
Thanks
So for those of you with rear diffusers what is the fastest you have gone and what do you think they can handle?
Thanks
I had a Tom's rear diffuser, it utilized the lower bumper bolts to be bolted up on the bottom and double sided tape on the upper portion of the rear bumper. Carbon Fiber version...they are nearly weightless.......It didnt weigh anymore than a couple sheets of paper......no issues with it ever coming undone
I think our cars are drag (aerodynamically) limited under stock power. Even if electronically limited, if you have modifications, especially headers or nitrous, you can get the car up over the stock limits. Of course there's the issue of accuracy on the speedometer too, so who knows if 174 indicated is really 174. The point is, with proper mounting, you won't drive too fast to rip the diffuser off.
Last edited by vbb; Sep 29, 2012 at 12:22 PM.
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Driver School Candidate
Joined: Aug 2012
Posts: 9
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From: Rutland
The limiter prevents further acceleration when the reading hits 169 on mine 
Tested on a UK racetrack we call M5. Well, it looks like a racetrack to me 
But as the post above says, the true mph will typically differ from that indicated and the poster with 172+ must have either been using better equipment (gps based?) to measure the true speed or have an expensive bit of japanese kit that overrides the limiter.
Tested on a UK racetrack we call M5. Well, it looks like a racetrack to me But as the post above says, the true mph will typically differ from that indicated and the poster with 172+ must have either been using better equipment (gps based?) to measure the true speed or have an expensive bit of japanese kit that overrides the limiter.
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Thread Starter
Lexus Test Driver
Joined: May 2011
Posts: 1,054
Likes: 2
From: va
I just wanted to make sure. If I'm gonna throw down a grand I want to know that it's not gonna go anywhere. So the 3m tape on the akrym will be enough.
Last edited by zapa; Sep 29, 2012 at 02:12 PM.
The 3M tape works exceptionally well - had aero parts on for years with it on another vehicle - same speeds as others posted above with no problems - however if you can add a fees nuts and bolts in a few spots without it looking bad then that is alwaus a plus
Lexus Champion
Joined: Jun 2007
Posts: 2,148
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From: Aventura, Florida
I think our cars are drag (aerodynamically) limited under stock power. Even if electronically limited, if you have modifications, especially headers or nitrous, you can get the car up over the stock limits. Of course there's the issue of accuracy on the speedometer too, so who knows if 174 indicated is really 174. The point is, with proper mounting, you won't drive too fast to rip the diffuser off.
Stock Tire Hight- Limiter comes in at 6300RPM @169MPH
Aftermarket DR- Limiter comes in at 6300RPM @ 175MPH
Due to the fact that I run a different tire size, I really dont pay much attention to what the sleed on the dash says. I know exactly where im at by using the calculations from the drivetrain and engine RPM.
Thread Starter
Lexus Test Driver
Joined: May 2011
Posts: 1,054
Likes: 2
From: va
I run a taller tire.
Stock Tire Hight- Limiter comes in at 6300RPM @169MPH
Aftermarket DR- Limiter comes in at 6300RPM @ 175MPH
Due to the fact that I run a different tire size, I really dont pay much attention to what the sleed on the dash says. I know exactly where im at by using the calculations from the drivetrain and engine RPM.
Stock Tire Hight- Limiter comes in at 6300RPM @169MPH
Aftermarket DR- Limiter comes in at 6300RPM @ 175MPH
Due to the fact that I run a different tire size, I really dont pay much attention to what the sleed on the dash says. I know exactly where im at by using the calculations from the drivetrain and engine RPM.
Lexus Champion
Joined: Jun 2007
Posts: 2,148
Likes: 0
From: Aventura, Florida