Originally Posted by mlct

P.S. now you might ask why modify an already great car. A silly thing to do I agree and would not work for racing as the car is on the heavy side. I blame iRacing and rFactor2 as driving the 911 RSR (the "old" GTE car) "felt" awesome so I decided I wanted some aero but didn't want to go the Cup Car or non-Porsche route. Also tried the old Williams or the new Mercedes F1 cars in iRacing. You hardly brake or lift at Lime Rock. I could develop some bad habits driving those F1 cars too much.

Originally Posted by mlct

All the reviews of the new GT3 RS and GT4 RS suggests that factory aero makes a difference. I agree with those above that say the more advanced suspension, horsepower for some, and lighter weight for some (911 Cups in particular there) street 911's may be what you are looking over.a modified Cayman. My experience below is with a track only modified 981 Cayman Clubsport for HPDE sessions so if you are going that route it might be relevant. For me aero works.

Procoach is doubt correct about the effects of added aero. While I have not attacked any brake zones yet to feel that difference mentioned I definitely have more grip overall with the various Verus Engineering products now on my 981 Clubsport. Note: the car was already modified by its previous owners (thanks!) with vented front venders, dive planes, JRZ 4 ways, a 997 RSR style rear wing, a 4.25l Deman engine (500+ HP), and various other items so not a stock Clubsport at all.

Briefly:

Last year I added the Verus Front Splitter and Rear diffusor, lowered the ride height and put on stiffer springs needed to stop the car from bouncing off the track. I felt more grip but didn't set any dramatically faster lap times at Lime Rock (down .2) and nothing really at Watkins Glen (still roughly a second slower than I had down in my old GTB1ish car before I wrecked it at WGI back in 2000).

This year the Verus dual dive plans and swan neck rear wing went on and wow.

- I set a new personal best at Lime Rock in my first few laps out and was not driving particularly well (IMHO) or very aggressively. The shocks were rebuilt over the winter but I think that is due to the new rear wing as I don't think my..uh..private parts got any bigger over the winter! That new best is a 56.1 down from a 57.08. A pro did a 54.8 that day so more to go... .

- a personal best in my first visit to Watkins Glen this year and, once again I don't think I was on the apexes as I should be. That was a 2.00.62 down from 2.03.17 (2.02.4 in my old car back in 2019). This was with the same high downforce setting (9 degrees angle of attack which is on the high side for the Verus wing) I used at Lime Rock. I will try less rear wing at the Glen soon to see if I pickup more speed on the straights. There is a video on YouTube of pro Jan Heylen doing a 1.51 in a Clubsport from a few years ago so lots more time to go. Other non-pros in the 1.50's too so under 2 min is a reasonable goal for me.

So far the Verus products are well designed and built. Very happy with them.

Good luck,

Mark
P.S. now you might ask why modify an already great car. A silly thing to do I agree and would not work for racing as the car is on the heavy side. I blame iRacing and rFactor2 as driving the 911 RSR (the "old" GTE car) "felt" awesome so I decided I wanted some aero but didn't want to go the Cup Car or non-Porsche route. Also tried the old Williams or the new Mercedes F1 cars in iRacing. You hardly brake or lift at Lime Rock. I could develop some bad habits driving those F1 cars too much.

Originally Posted by mjdcolo

It does when I ask myself, "Am I going to want to put aftermarket aero on a non-gt car because I'm not finding the grip and stability I want, or better yet what I'm used to?" Tracking that GT3 around Mid-Ohio, PItt, and Road America has now spoiled me. So much so that I think the only way to go is to dive into a dedicated track machine (Cup Car, or mod the hell out of a 911 or Cayman S). That way I can also get a simple Porsche for the road (maybe even an old G-series), and it doesn't have to be some extreme model.

Originally Posted by b16gsr

If you want comparison, we were just at Road America my best friend Andy had is manual 991.2 GT3 lightly modified with Pirelli DH and I have a pretty heavily modified with Pirelli DH, stock tune 991.2 911 S X51. We ran almost the exact same lap times, his 2:20.75 to my 2:20.73 and looking at the video and data the aero, plus the top end horsepower of the GT3 surpasses my car. He passes me like I am standing still coming up the hill into 1. I brake later than he does so I catch him, but in the corners the aero helps him stick and get away faster.

Originally Posted by mjdcolo

Thanks for sharing. That's a good comparison, and those are pretty damn good times. How modified is your 911S?

I was only able to get to 2:32:15 stock with Hoosers and -3.0 all around - granted that was my first time to RA, so I'll take it. Nothing improves times better than experience and great coaching.

Originally Posted by mjdcolo

I think this answers a lot of my question, too:

https://www.pca.org/news/manthey-rac...rburgring-time

Originally Posted by Cory M

It sounds like you are doing track days and not competing in a race or time trial series. How important are your laptimes relative to the other cars in the track? Do you care more about how you stack up to others, or how your laptimes compare to your own personal best?

Originally Posted by ProCoach

I don’t think and I haven’t seen aero significantly enhance lap times unless the driver is willing to work closer to the limit. THAT is where the edge in confidence allows the driver to SLOW LESS!