Boxster 986 Aerodynamics @180km/hr

[steved0x]

Originally Posted by Nine8Six

Oh anyone reading and have a spare hard top, please retrofit and go kill some 911 cars with it

Good car shapes... natural air compressor lolll

I have a hardtop but I haven't been running it on track because of the extra 55 pounds...

I'll take it with me next time, and hopefully the temp and other conditions will be similar, and I'll post a comparison.

Unfortunately there will be another change at the same time between the two runs, I have sold my Beluga Exhaust and putting my original exhaust back on, but with the Fister mod. With the Beluga I was consistently getting to 126/127 with two times of 128 on the front straight at RRR (vs 122 with the stocker). Some of this is technique but I am not coming through turn 9 6 mph faster so some is the car. Will be interesting to see what happens with the Fister. I may do some runs with the hard top off and then add it back on for a comparison, that way we can do both on the same day.

[Nine8Six]

Originally Posted by steved0x

I have a hardtop but I haven't been running it on track because of the extra 55 pounds...

Gut it man, toss the useless weight away and install this with ducts running to your air intake (testing your fabrication skills haha). You'll get something like +35% compressed air on the 986. See first few plots.

Always wondered why the roof area was used by the performance guys (ruff, mirage cgt, etc). It just never made any sense to me (roof?!?) until I saw why like you guys did.

[steved0x]

Originally Posted by Nine8Six

Gut it man, toss the useless weight away and install this with ducts running to your air intake (testing your fabrication skills haha). You'll get something like +35% compressed air on the 986. See first few plots.

Always wondered why the roof area was used by the performance guys (ruff, mirage cgt, etc). It just never made any sense to me (roof?!?) until I saw why like you guys did.

I want it! Maybe with two channels - the other to feed an air to oil cooler

I saw a 2nd gen MR Turbo with a roof scoop like this and it was sweet!

[BIGJake111]

Originally Posted by steved0x

I have a hardtop but I haven't been running it on track because of the extra 55 pounds...



I'll take it with me next time, and hopefully the temp and other conditions will be similar, and I'll post a comparison.



Unfortunately there will be another change at the same time between the two runs, I have sold my Beluga Exhaust and putting my original exhaust back on, but with the Fister mod. With the Beluga I was consistently getting to 126/127 with two times of 128 on the front straight at RRR (vs 122 with the stocker). Some of this is technique but I am not coming through turn 9 6 mph faster so some is the car. Will be interesting to see what happens with the Fister. I may do some runs with the hard top off and then add it back on for a comparison, that way we can do both on the same day.

Butt dyno says hardtop off is faster.