zapa

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

cchung0588

iTrader: (-1)

i've gone 140+ on the track and on the freeway still intact !

zapa

which diffuser do you have and what type of tape did you use? Also how much do you think the thing weighs?

Kramer

iTrader: (15)

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

MRxSLAYx

The S4 Play one i have has seen 172-174 multiple times

zapa

how did you hit 172 -174 when our cars are limited to 170?

vbb

iTrader: (3)

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.

JasonH42

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.

zapa

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.

meangene4

iTrader: (1)

I have a arkym diffuser that's being held on with 3m and I've reached speeds of 120+, haven't budged the diffuser.

2ndGF

iTrader: (1)

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

MRxSLAYx

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.

zapa

Ahh that makes sense. About how long does it take the f distance wise to go 0-175ish??

MRxSLAYx

Dont know for sure, but definitely shorter than 3/4 a mile for my car. Not sure what a stock F would do.

zapa

please tell me you dont spray the whole time