Prelim testing completed for race splitter/airdam system
02-06-2007, 10:41 AM
#41
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Hopefully not too bad. But it does need a rear wing.
Originally Posted by julian
i can already picture what would happen if people put the front splitter on without adding downforce in the rear.... 
02-06-2007, 05:33 PM
#45
Originally Posted by Chebosto
i thought u went full Cwest body kit??
02-06-2007, 10:43 PM
#46
Originally Posted by 350ZNV
I did, but it only lasted one track day. Needless to say, I was not impressed by the durability of the C-West kit. I went off track once and it was completely destroyed. I didn't even hit anything, just went off into the dirt. Too flimsy for the track if you ask me.
liek.. all of it was toast? what about the sides? do you still have em?
as for the splitter, how come you didnt extend the center portion more, past the oil pan? that would create an even smoother airflow
Last edited by Chebosto; 02-06-2007 at 10:48 PM.
02-07-2007, 12:04 AM
#47
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That doesn't do any good if that smooth air runs into the remaining area of the under chassis ie: a snaking exhaust pipe, this or that protrusion. It simply becomes distorted air again. Which is why undertrays are the best way to control that. This splitters underside just controls how much air is going under the nose of the car. Less air the better.
Originally Posted by Chebosto
liek.. all of it was toast? what about the sides? do you still have em?
as for the splitter, how come you didnt extend the center portion more, past the oil pan? that would create an even smoother airflow
as for the splitter, how come you didnt extend the center portion more, past the oil pan? that would create an even smoother airflow
02-07-2007, 07:00 AM
#49
Originally Posted by Chebosto
liek.. all of it was toast? what about the sides? do you still have em?
Front bumper...
Note side skirt...
The sad part is that it got WAY worse than that by the end of the day.
02-07-2007, 07:11 AM
#50
This splitters underside just controls how much air is going under the nose of the car. Less air the better.
Look a the R10's front splitter/diffuser design:
http://www.mulsannescorner.com/audir10-1.html
A splitter by itself generates downforce, a splitter with a flat front undertray and a diffuser(s) generates a lot of downforce. For the 350Z it would need to be a sedan style undertray/diffuser with two separate small diffusers pointed toward the front wheel wells.
02-07-2007, 08:12 AM
#51
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Isn't that 1.5 to 2.5 degrees to compensate for part flex under load? Because i always thought that if they wanted a specific amount of air to flow under the car, they would create an open channel in the center of the front of the car. I know it is different for super cars obviously, they sit much lower usually. If that is correct what you say, it must be the very maximum allowable angle before you start using the splitter as a device to act as a kind
of wing and it wants to start lifting up instead of staying neutral.
of wing and it wants to start lifting up instead of staying neutral.
Originally Posted by betamotorsports
Actually, a splitter that's designed to work with a good undertray/front diffuser is angled up slightly (1.5 to 2.5 degrees from horizontal) to move more air under the car.
Look a the R10's front splitter/diffuser design:
http://www.mulsannescorner.com/audir10-1.html
A splitter by itself generates downforce, a splitter with a flat front undertray and a diffuser(s) generates a lot of downforce. For the 350Z it would need to be a sedan style undertray/diffuser with two separate small diffusers pointed toward the front wheel wells.
Look a the R10's front splitter/diffuser design:
http://www.mulsannescorner.com/audir10-1.html
A splitter by itself generates downforce, a splitter with a flat front undertray and a diffuser(s) generates a lot of downforce. For the 350Z it would need to be a sedan style undertray/diffuser with two separate small diffusers pointed toward the front wheel wells.
02-07-2007, 08:37 AM
#52
you would only want to raise it up if you actually had channels / vanes to direct air in an upward move ment.. the Audi has it cuz it has a flat underbody, so by allowing more air underneath it, the rest (rear diffuser) has more air flow to work with.
for the Z. even tho there is exhaust pipes and rear suspension to deal with, by elongating the center piece, the air is smoothed out more thus creating a more even, and depending on angle, faster airflow for the amount of air that does go under the splitter.
350ZNV: were your side skirts bolted to the bottom? did they really tear out like that? DOH.
for the Z. even tho there is exhaust pipes and rear suspension to deal with, by elongating the center piece, the air is smoothed out more thus creating a more even, and depending on angle, faster airflow for the amount of air that does go under the splitter.
350ZNV: were your side skirts bolted to the bottom? did they really tear out like that? DOH.
02-07-2007, 08:37 AM
#53
Isn't that 1.5 to 2.5 degrees to compensate for part flex under load?
They were having high speed understeer problems on the Daytona banking so they set up a video camera and filmed the splitter angle of attack as the car ran on the back straight. They found that the splitter was horizontal at speed so they checked it and found the shop had set the splitter/undertray horizontal to the ground. Adjusting it to an up angle of 1.5 degrees solved the problem.
EDIT: I was told this upward angle of attack only works if there's a front undertray and a front diffuser. Without those extra aero components a splitter should be thought of as a front spoiler and positioned accordingly.
Last edited by betamotorsports; 02-07-2007 at 08:43 AM.
02-07-2007, 08:46 AM
#54
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That is very interesting to know.
So it sounds like the car is seeing much of it's downforce by diffusion instead of downforce on the leading edge. And that angle actually would not change the splitters diffusion effect.
So it sounds like the car is seeing much of it's downforce by diffusion instead of downforce on the leading edge. And that angle actually would not change the splitters diffusion effect.
Originally Posted by betamotorsports
Not that I'm aware of. You should be able to stand on the end of splitter and not see it move at all (assuming it can generate hundreds of pounds of downforce). I am not an aerodynamics expert but I did crew on the Sportsfeed/Cunninghan GTS-R Viper team that came in 7th overall in the 2000 Rolex 24 Hours.
They were having high speed understeer problems on the Daytona banking so they set up a video camera and filmed the splitter angle of attack as the car ran on the back straight. They found that the splitter was horizontal at speed so they checked it and found the shop had set the splitter/undertray horizontal to the ground. Adjusting it to an up angle of 1.5 degrees solved the problem.
They were having high speed understeer problems on the Daytona banking so they set up a video camera and filmed the splitter angle of attack as the car ran on the back straight. They found that the splitter was horizontal at speed so they checked it and found the shop had set the splitter/undertray horizontal to the ground. Adjusting it to an up angle of 1.5 degrees solved the problem.
02-07-2007, 09:56 AM
#57
Originally Posted by Chebosto
350ZNV: were your side skirts bolted to the bottom? did they really tear out like that? DOH.
02-07-2007, 12:08 PM
#58
Originally Posted by 350ZNV
Yeah, they were, but the bolts ripped big holes in the fiberglass when I went off. As soon as I got the pieces, I was instantly suprised at how thin and flimsy they were, but I figured C-West knew what they were doing and have a lot of track experience. Guess not.
thats pretty disappointing,
i guess if u dig hard enough sideways **** will fall off regardless of brand.you should see all the bumpers that fly off during drifting competitions.. doesnt matter what brand, they ALL come off and get ran over! haha.
02-07-2007, 12:56 PM
#59
Originally Posted by Chebosto
thats pretty disappointing, i guess if u dig hard enough sideways **** will fall off regardless of brand.
you should see all the bumpers that fly off during drifting competitions.. doesnt matter what brand, they ALL come off and get ran over! haha.
i guess if u dig hard enough sideways **** will fall off regardless of brand.you should see all the bumpers that fly off during drifting competitions.. doesnt matter what brand, they ALL come off and get ran over! haha.
02-08-2007, 11:37 AM
#60
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Originally Posted by kognition
No offense taken, i had a stressful day yeserday and i did not intent to sound
like i was offended.
You are right, we do not use load cells for testing.
The SAE splitter that was tested is in my possession, not just numbers picked from the web. And the customer who paid for the testing is also my customer
RobiSpec (Robert Fuller). We produce splitters for their Evo's. Very close in surface area to our Z splitters.
We mount the test part securely, and we apply an even downforce on the exposed edge until the part fails. And as an fyi, it extends behind the front bumper 16 inches back. It is also funtioning as a diffuser. I wish i had a wind tunnel.
like i was offended.
You are right, we do not use load cells for testing.
The SAE splitter that was tested is in my possession, not just numbers picked from the web. And the customer who paid for the testing is also my customer
RobiSpec (Robert Fuller). We produce splitters for their Evo's. Very close in surface area to our Z splitters.
We mount the test part securely, and we apply an even downforce on the exposed edge until the part fails. And as an fyi, it extends behind the front bumper 16 inches back. It is also funtioning as a diffuser. I wish i had a wind tunnel.
Also, that rubber edge protector on the spliter will affect the aerodynamics of the splitter (my guess is it will cause more turbulance)