As it states, I am looking for bumpers/front spoilers that actually have been tested, real-world or otherwise, to have a positive improvement over stock. Unfortunately, I'm in the market for a few new pieces. I'm also interested in underpans.

Please feel free to move this if it is not placed in the correct forum. I thought R&C might have been a better choice. Thanks.

 

the mugen front lift is "supposed" to add downfowrce when braking. thats what they claim, but who knows? i'm not to sure of any other ones.

 

Skip, you're not going to find many aero pieces that have proven downforce. You're going to be experimenting for yourself.

I'm pretty sure you should be concentrating on rear downforce instead of front downforce. The car has inherent lift at the rear at speed.

Undertrays theoretically sound like a good idea, but to be really effective you typically have to have an extremely low ride height and the super stiff suspension to prevent bottoming out.

 

Thanks. As for the front bumper/lip, I had never heard of one being vastly superior to another, hence the question.

My car is pretty low(probably too low for the track). I didn't get the 500/550's in before this last track day. Those will be going in during repairs. I run with the hardtop on and have the 3pc Mugen rear spoiler. While I know the BAUW might be the most functional at speed, I cannot bring myself to such atrocities.

One of the guys at the track had the Feel's CF rear diffuser/underpan. He said he did not have data with the only variable changing being the diffuser. His car is also gutted- lighter.

And yes, the rear bumper is being replaced as well. Any further suggestions?

 

I remember reading somewhere on one of these threads that the c-west front was functional at high speeds, Mugen too. But who knows for sure

 

If you can salvage your old trunk lid, slap on a BAUW. Switch the trunk lid for track days.

You actaully want to be as low as possible on the track, as long as the suspension is working with out bottoming or hitting the damper bumpstops. Lower center of gravity. It just that you have to get the springs AND shocks adjusted for the smaller range of motion. This typically means really stiff and not suitable for the street. With 500 lb/in springs, you should check if your Koni's need to be revalved to be able to damp the higher spring rate.

 

Check out the info on the J's Racing website about the new Type S front bumper. They state negative lift and various cooling efficiencies are improved over the previous body kit. I think they also mention flow testing for the dual canard wings. It seems that the dual canards give increased downforce versus the single canard setup, which is the only one allowed in the JTGC series.

http://www.jsracing.co.jp/

-Pete

 

C-west with the functional canards would create more downforce. Any splitter/canard combo on any type bumper would do it for you also.

 

As we all know the Mugen products are tested to at the least verify that they will not have a negative effect. It has also been stated that the 04' lip from Mugen helps to increase stability during hard breaking at high speeds.

I do not know if they mean that it scrapes along the ground and keeps the car stable though

I have also read a number of times that the Amuse lip and bumper are tested and shown effective but I do not have any non-internet information to back this up.

As rear diffusors go I would expect that their effectivness would be strongly related to the wing that you are using since they seem to be synergistic pieces. This is just a guess though. My vote for a rear diffusor would be for the J's it seems to be the least gaudy of the commonly used ones.

If I were in your position I would get 04' bumpers and a Mugen lip.

 

I agree with ImportSport, Skip.

Go with the '04 bumpers with Mugen front lip and your Mugen rear desk spoiler