rear diffusers
09-04-2010, 02:23 PM
#41
Wirelessly posted
very true but wouldn\'t that mean when you lift off the throttle it would interupt the \"flow\"?? or the more exhaust there is the more thats being forced out the diffuser and at some point it would creat some unwanted turbulence. might not be the best idea for the high hp, high exhaust flowing turbo guys. if im wrong let me know. these are just my
Agree with this as well. In my belief the ideal location for exhaust termination for aerodynamics is on one of the sides up in the body work so that the air coming by will pick it up and take it down the side of the car and away rather than trying to scavenge it with an aero device.
Originally Posted by road-raser
Originally Posted by Asx
Not extremely relevant to this discussion, but if your diffuser is made of aluminum you can dump your exhaust in at a nice angle and it willspeed up the flow.
very true but wouldn\'t that mean when you lift off the throttle it would interupt the \"flow\"?? or the more exhaust there is the more thats being forced out the diffuser and at some point it would creat some unwanted turbulence. might not be the best idea for the high hp, high exhaust flowing turbo guys. if im wrong let me know. these are just my
Last edited by thagr81 us; 09-04-2010 at 02:24 PM.
Reply
0
0
09-04-2010, 05:21 PM
#43
IIRC the idea is that the air going through the fins of the diffuser is high velocity low pressure. Venturi effect blah blah blah lowers pressure under body blah blah. The exhaust there just adds heat and flow through the "venturi" to add velocity. I would think that on decel the flow would just be as normal.
It must have been another book that had the discussion about exhaust flow and diffusers
It must have been another book that had the discussion about exhaust flow and diffusers
Last edited by Asx; 09-04-2010 at 05:36 PM.
Reply
0
0
09-04-2010, 05:28 PM
#44
Wirelessly posted
I mean if you were to go out the back of the car this might be your best option but it is in no way optimal... It would basically be like trying to scavenge the air coming off the roof with the rear spoiler which has already been altered than getting fresh high velocity linearly flowing air that was uninterrupted... Side exit is the optimal way to go, this might be second, but don\'t expect to see any measurable difference from just the diffuser by itself in my humble opinion.
I mean if you were to go out the back of the car this might be your best option but it is in no way optimal... It would basically be like trying to scavenge the air coming off the roof with the rear spoiler which has already been altered than getting fresh high velocity linearly flowing air that was uninterrupted... Side exit is the optimal way to go, this might be second, but don\'t expect to see any measurable difference from just the diffuser by itself in my humble opinion.
Last edited by thagr81 us; 09-04-2010 at 09:51 PM.
Reply
0
0
09-07-2010, 04:46 AM
#45
Senior Member
Thread Starter
iTrader: (1)
Join Date: Mar 2008
Location: Cromwell CT
Posts: 1,146
Total Cats: 56
you guys are talking about blown diffusers? i think this is way over our heads, this is big in F1 right now and even those guys are having issues getting it right. well adrian newey got it right
Reply
0
0
09-07-2010, 10:03 AM
#48
Elite Member
iTrader: (15)
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,847
Total Cats: 27
I'm putting in pneumatic lifters so I can rev to 18,000.
I like that AWR diffuser due to the curved entry lip. That should help expand the airflow with less turbulence as compared to a sharp entry bend.
I like that AWR diffuser due to the curved entry lip. That should help expand the airflow with less turbulence as compared to a sharp entry bend.
Reply
0
0
09-11-2010, 04:49 PM
#51
Senior Member
iTrader: (4)
Join Date: Aug 2010
Location: Farmington Hills, MI
Posts: 460
Total Cats: 15
very true but wouldn't that mean when you lift off the throttle it would interupt the "flow"?? or the more exhaust there is the more thats being forced out the diffuser and at some point it would creat some unwanted turbulence. might not be the best idea for the high hp, high exhaust flowing turbo guys. if im wrong let me know. these are just my
Agree with this as well. In my belief the ideal location for exhaust termination for aerodynamics is on one of the sides up in the body work so that the air coming by will pick it up and take it down the side of the car and away rather than trying to scavenge it with an aero device.
Reply
0
0
09-15-2010, 09:36 PM
#55
Senior Member
iTrader: (5)
Join Date: Jan 2008
Location: Central, TX / Bay area, CA
Posts: 1,260
Total Cats: 5
How do you live, I had a car truck and a motorcycle when I was away at school, I just thought one of each would be nesassary but 2 may be overkill for school
Reply
0
0
09-15-2010, 10:53 PM
#57
Senior Member
iTrader: (5)
Join Date: Jan 2008
Location: Central, TX / Bay area, CA
Posts: 1,260
Total Cats: 5
No i meant it would be overkill to have multiples of each but come to think of it I had 2 motor cycles during that time not just one so I guess it was overkill.
Reply
0
0
04-24-2011, 09:09 PM
#59
Elite Member
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,826
Total Cats: 67
I have a finished mould for a very large diffuser, with a chord or about 600mm. It covers the entire area between the diff and the bumper, and is riveted to the bumper, but only to hold it still not to transfer force, it will need to be bolted to the floor also.
Ill post photos of the mould asap, I just need to pull my finger out and lay some glass over it.
Dann
Ill post photos of the mould asap, I just need to pull my finger out and lay some glass over it.
Dann
Reply
0
0
05-01-2011, 11:23 PM
#60
Elite Member
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,826
Total Cats: 67
Ok got off my ****,
Heres the mould just about ready for some glass/fibre.
Before anyone points out the lines I drew arent straight, I Know, I only put them on there just now so that everybody can see the general curve.
Its for an NA, it goes from rear subframe to bumper, starts about 5 degrees makes its way to 15 ish. It will be riveted to the bumper but it will have rods mounted through the boot floor to actually support it and some hektik fins. Brah.
its not the exact shape its about 2 inches bigger all around to allow for laying the fibreglass and then to cut it to perfect fit.
http://img819.imageshack.us/g/img0793cu.jpg/
Dann
Heres the mould just about ready for some glass/fibre.
Before anyone points out the lines I drew arent straight, I Know, I only put them on there just now so that everybody can see the general curve.
Its for an NA, it goes from rear subframe to bumper, starts about 5 degrees makes its way to 15 ish. It will be riveted to the bumper but it will have rods mounted through the boot floor to actually support it and some hektik fins. Brah.
its not the exact shape its about 2 inches bigger all around to allow for laying the fibreglass and then to cut it to perfect fit.
http://img819.imageshack.us/g/img0793cu.jpg/
Dann
Last edited by nitrodann; 05-04-2011 at 08:33 PM. Reason: Actually just hit the edit button to steal the imageshak links
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
01-08-2021 11:24 AM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
