Z06

I have an 04 street GT3 with the stock wing and have been considering the slightly larger RS Wing from Manthey, it is said to have 32kgs more down force at 125mph, it larger, wider and longer then the stock wing with the side wing plates
I like to run at Mosport which is a highspeed track would this help?

Is 32kgs of rear down force a real improvement?

For the front they cut out some slits like the cup car and it's claimed to reduce lift 15kgs, is this real improvement as well?

SundayDriver

Every little bit helps, and this is a LITTLE bit. Look at is as percentage of weight with driver, fuel etc. Your car is around 1500 kg so 32 at 125 mph is about 2%. At 100mph, you have about 2/3 of that downforce. You should see that as an improvement in g's which means that you can take a corner a 100mph about 1 mph faster if that were balanced front and rear (assuming you use both parts you mentioned). So a key question is "Do you drive the car within 1mph of the limit in 100mph corners"? If so, then it is a real benefit, if not, then not really any benefit.

That said, however, if the car feels better to you and raises your confidence, then you are likely to use more of what is available. I have seen lots of folks go 10mph faster in T8 at Willow just because they "think" their new wing is really helping. Confidence is a huge factor.

JackOlsen

As Mark points out, it really depends on the driver. Most of us would feel no difference at all -- and I'm saying that as someone with five years of track experience and a shelf full of trophies. But if you're in a position (more like Mark) where you're pretty much as fast as most pro drivers would be in the same car, then 15 pounds would make a difference as you're wringing the very last nth out of the car.

Z06

Thanks very much for your help,

Rick964

Guys, 32kg is 70 lbs not 15.

Z06

I think he ment the example.. 15lbs would be important to a pro driver, these gains would be hard to notice with an average driver, which I am.

JackOlsen

Actually, my math was bad. But the point would be pretty much the same. And remember that the downforce rates aren't linear -- so if it's 70 pounds at 125, it's not going to be 55 pounds at 100, but a lower figure.