LS3 Z track Diary and evolution.
08-13-2015, 10:09 PM
#23
I'm at the crossroads now. Making up 2 seconds or more is going to be very hard without changing the car. looking at the accelerometer data my best theoretical lap could have been a low 1:40.The cheapest and simple way would be to strip the car to the limits of the class, I think I could shave 200 lbs at least doing that.
The car does understeer pretty good which is expected with the staggered setup so I may be able to sneak some time in with a square setup. I've already been talking to someone for a set of RPF1's at 18x10.5 et +15 so I can run a 295 or 305 square setup. Losing the understeer might get me the time between.
The next option is a major aero revision and more power. If I did this it would be in conjuction with option 1. So I guess full race car? I'm not sure I want to do that. I like driving the car to work on sunny days.
I could do option 2 and add power as well and do it I suppose. That would make me laugh to take a pro street win with a full interior and no aero...
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Classy (08-14-2015)
08-14-2015, 05:31 AM
#25
Originally I was planning a cam and long tubes but this past weekend I was already bumping very close to the Db limits on my current exhaust so it might just be cam only or maybe cam and LSA blower, I need to look at class rules regarding the blower.
As for Aero, I like the way the nismo looks as is so I would likely need a second kit to make for the track and a second hatch to put a lexan window in with a wing.
As for Aero, I like the way the nismo looks as is so I would likely need a second kit to make for the track and a second hatch to put a lexan window in with a wing.
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terrasmak (08-18-2015)
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Classy (08-19-2015)
08-19-2015, 06:55 AM
#35
Vendor - Former Vendor
Originally I was planning a cam and long tubes but this past weekend I was already bumping very close to the Db limits on my current exhaust so it might just be cam only or maybe cam and LSA blower, I need to look at class rules regarding the blower.
As for Aero, I like the way the nismo looks as is so I would likely need a second kit to make for the track and a second hatch to put a lexan window in with a wing.
As for Aero, I like the way the nismo looks as is so I would likely need a second kit to make for the track and a second hatch to put a lexan window in with a wing.
How do they measure the Db? A nice long burns muffler and a turn down on the opposite side of where they measure should suffice!
As for Aero, How about a nice APR splitter? Seibon hatch with a nice wing may also help.
08-19-2015, 11:21 AM
#36
A carbon hatch will likely be in the equation, or at least a gutted extra stock hatch with lexan, I can change any glass behind the front windows for lexan per the class rules.
I'm in the process of designing a rear wing right now, I've got the model made in CAD and I'll run it through CFD software hopefully within the week. If the design looks favorable in CFD I'll 3d print a full size wing out for road testing. Following that, I'll make one out of CF.
I'll look into the APR splitter but as far as I know its a flat piece of CF. I would rather make a custom one that I can slope up in the back and other areas while making use of the nismo V3 front design.
For the DB test they stood 1 meter behind the exhaust exit. Turn down pipes are not allowed but it says nothing about turning the exit to the side... I'm not familiar with a burns muffler, do tell.
I'm in the process of designing a rear wing right now, I've got the model made in CAD and I'll run it through CFD software hopefully within the week. If the design looks favorable in CFD I'll 3d print a full size wing out for road testing. Following that, I'll make one out of CF.
I'll look into the APR splitter but as far as I know its a flat piece of CF. I would rather make a custom one that I can slope up in the back and other areas while making use of the nismo V3 front design.
For the DB test they stood 1 meter behind the exhaust exit. Turn down pipes are not allowed but it says nothing about turning the exit to the side... I'm not familiar with a burns muffler, do tell.
08-19-2015, 12:27 PM
#38
I'll post pictures of the process along the way as best as I can, I won't show the chord profile though since it is my own wing design..
Here is the CAD model with endplates. If my math is right, downforce looks to be just above 147 lbs of downforce at 60 mph with around 43 lbs of drag at 8 degrees
Here is the CAD model with endplates. If my math is right, downforce looks to be just above 147 lbs of downforce at 60 mph with around 43 lbs of drag at 8 degrees
08-21-2015, 12:19 PM
#39
So I ran the profile through CFD and learned some pretty good stuff about the wing. First off, at 0 degrees the wing creates 117 lbs of downforce with 27lbs of drag. It makes zero downforce at around -2.5 degrees.
Next, I was off by a large margin on downforce at 8 degrees, but in a good way, it made much more downforce and not much more drag.
The airflow starts separating from the bottom the wing past 8 degrees. Any further angle of attack results in rapid increases in drag because of this.
here is the profile at 0 degrees.
At 8 degrees
I've made some small adjustments to the trailing edge since these models and it has been favorable in the CFD. At this point I'm going to start making the prototype and move into real world testing.
Next, I was off by a large margin on downforce at 8 degrees, but in a good way, it made much more downforce and not much more drag.
The airflow starts separating from the bottom the wing past 8 degrees. Any further angle of attack results in rapid increases in drag because of this.
here is the profile at 0 degrees.
At 8 degrees
I've made some small adjustments to the trailing edge since these models and it has been favorable in the CFD. At this point I'm going to start making the prototype and move into real world testing.
08-24-2015, 12:21 PM
#40
Just an FYI, a hockey puck works for a rear differential bushing. Here it is after 500 miles and 3 hours on track. It held up just as good as the whiteline to be fair.
Also, I've moved forward to producing a prototype rear wing, Its going to take a while for this, its a very slow process.
Also, I've moved forward to producing a prototype rear wing, Its going to take a while for this, its a very slow process.
