Notices
996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.
Sponsored by:

Theoretical top speed on a stock tranny?

 
  #16  
Old 12-31-2012, 11:40 AM
BlackHorseTurbo's Avatar
Registered User
Thread Starter
Join Date: Jul 2008
Location: Houston
Posts: 5,310
Rep Power: 600
BlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond reputeBlackHorseTurbo has a reputation beyond repute
Originally Posted by Tim941NYC View Post
240 in the mile with cd of31 is around 960ft lbs of torque at the rpm you need to rev at to get that speed.
Originally Posted by Powell View Post
960rwtq of torque at 7800 RPM to get 240 based on the .75 6th gear?

Oh Lord. Not again. Keep it civil please you two.
 
  #17  
Old 12-31-2012, 11:42 AM
Powell's Avatar
Registered User
Join Date: Jan 2007
Location: Friendswood, TX
Posts: 3,488
Rep Power: 378
Powell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond reputePowell has a reputation beyond repute
Originally Posted by BlackHorseTurbo View Post
Oh Lord. Not again. Keep it civil please you two.
Was not to start an argument I just wanted to know if he meant rwtq or flywheel.
 
  #18  
Old 12-31-2012, 12:03 PM
joetwint's Avatar
Registered User
Join Date: Dec 2005
Location: new york
Posts: 2,568
Rep Power: 597
joetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond repute
Originally Posted by Tim941NYC View Post


Joe,

I would think the light feeling you are talking about is "lift". And to further prove that point your sun roof was sucked out. There is plenty at play..
yes that is definetly part of it and as you say there are many factors at play but the wind does in fact wreak havoc on the short wheelbase Porsches.Ive seen it happen to Bello and even at the under 180 mph trap speeds at TI my car felt spooky under hard acceleration on Saturday when there was a 20mph crosswind
 
  #19  
Old 12-31-2012, 12:05 PM
Tim941NYC's Avatar
Registered User
Join Date: Jul 2010
Location: Long island NY
Posts: 3,298
Rep Power: 370
Tim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond repute
wheel..
 
  #20  
Old 12-31-2012, 12:10 PM
Tim941NYC's Avatar
Registered User
Join Date: Jul 2010
Location: Long island NY
Posts: 3,298
Rep Power: 370
Tim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond repute
Originally Posted by joetwint View Post
yes that is definetly part of it and as you say there are many factors at play but the wind does in fact wreak havoc on the short wheelbase Porsches.Ive seen it happen to Bello and even at the under 180 mph trap speeds at TI my car felt spooky under hard acceleration on Saturday when there was a 20mph crosswind
For sure its a big part. How do you keep the car down with out adding drag...
 
  #21  
Old 12-31-2012, 03:29 PM
Engine Guy's Avatar
Registered User
Join Date: Nov 2011
Location: Alberta, Canada
Posts: 900
Rep Power: 149
Engine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond repute
Originally Posted by Tim941NYC View Post
For sure its a big part. How do you keep the car down with out adding drag...
Quite simple actually but do you want to go there.

Drop it till it almost scrapes pavement, Vent the fenders, add a rear diffuser, build a removeable dam for the front openings then tape off all seams and gaps prior to running; then get a bit of drag back by adding a very low incidence splitter and a set of low incidence dive planes up front. When that was all done I would do a string test on the aerodynamics of the car then I would add a few small aerofins where needed to clean up the airflow even more.

Do it right and you will not add any drag, plus you then have a way more stable car.
 

Last edited by Engine Guy; 12-31-2012 at 03:35 PM.
  #22  
Old 12-31-2012, 04:21 PM
MCGT3's Avatar
Registered User
Join Date: Feb 2009
Location: Houston
Age: 50
Posts: 259
Rep Power: 32
MCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud of
Exactly. Plenty of ways to make them more stable without pushing down. As built, they have a fairly good drag coefficient number but still scoop a lot of air. I'm making a solid underpan of CF sheet for the car now....

Originally Posted by Engine Guy View Post
Originally Posted by Tim941NYC View Post
For sure its a big part. How do you keep the car down with out adding drag...
Quite simple actually but do you want to go there.

Drop it till it almost scrapes pavement, Vent the fenders, add a rear diffuser, build a removeable dam for the front openings then tape off all seams and gaps prior to running; then get a bit of drag back by adding a very low incidence splitter and a set of low incidence dive planes up front. When that was all done I would do a string test on the aerodynamics of the car then I would add a few small aerofins where needed to clean up the airflow even more.

Do it right and you will not add any drag, plus you then have a way more stable car.
 
  #23  
Old 12-31-2012, 08:07 PM
VGLNTE1's Avatar
Registered User
Join Date: Dec 2011
Location: Illinois
Posts: 1,507
Rep Power: 125
VGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond reputeVGLNTE1 has a reputation beyond repute
Subscribed
 
  #24  
Old 01-01-2013, 07:28 AM
BiteEmNBeatEm's Avatar
Registered User
Join Date: Jun 2010
Location: SA, TX
Posts: 552
Rep Power: 43
BiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud ofBiteEmNBeatEm has much to be proud of
well at 7000rpm you will be at 209mph

http://www.californiamotorsports.net...ck%20gears.pdf

 

Last edited by BiteEmNBeatEm; 01-01-2013 at 07:30 AM.
  #25  
Old 01-01-2013, 07:46 AM
Banned
Join Date: Dec 2008
Location: tn
Age: 57
Posts: 5,598
Rep Power: 622
32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute32krazy! has a reputation beyond repute
Originally Posted by BiteEmNBeatEm View Post
well at 7000rpm you will be at 209mph

http://www.californiamotorsports.net...ck%20gears.pdf

ok so the trans will go to 209 what amount of rwhp is needed to push the car to 209?
 
  #26  
Old 01-01-2013, 08:11 AM
MCGT3's Avatar
Registered User
Join Date: Feb 2009
Location: Houston
Age: 50
Posts: 259
Rep Power: 32
MCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud ofMCGT3 has much to be proud of
Todd has already gone in excess of 209MPH, and I believe he'll have more HP this time around.

At this point it's a matter of how fast he can get over a 1 Mile distance from a standing start.

His biggest challenge will be conditions and aero.

Originally Posted by 32krazy! View Post
Originally Posted by BiteEmNBeatEm View Post
well at 7000rpm you will be at 209mph

http://www.californiamotorsports.net...ck%20gears.pdf

ok so the trans will go to 209 what amount of rwhp is needed to push the car to 209?
 
  #27  
Old 01-01-2013, 08:34 AM
joetwint's Avatar
Registered User
Join Date: Dec 2005
Location: new york
Posts: 2,568
Rep Power: 597
joetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond repute
With my car making alot more whp than it was when it ran 231 i think its easily capable of going over 240 i just dont think the aero is there to do it.At this point i think it would be stupid to take the car back without doing some sort of aerodynamics testing.Getting the car in a wind tunnel with an aero engineer would be the ticket.Making any kind of aero changes without one would just be shooting arrows in the sky and actually is dangerous.I would advise anyone going back to be careful when making aero changes especially with things like flat panel bottoms.the car could just take flight if you get too much air under it or happen to spin sideways.I think one of the easiest and safest aero mods is to rake the car and get the front lower than the rear to keep front end lift to a minimum.I dont want to see anyone get hurt.
 
  #28  
Old 01-01-2013, 08:45 AM
Tim941NYC's Avatar
Registered User
Join Date: Jul 2010
Location: Long island NY
Posts: 3,298
Rep Power: 370
Tim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond reputeTim941NYC has a reputation beyond repute
Agreed.. wind tunnels are so hard to get time in though.. And a engineer that would be interested in this type of project just maybe even harder to find.
 
  #29  
Old 01-01-2013, 09:15 AM
Engine Guy's Avatar
Registered User
Join Date: Nov 2011
Location: Alberta, Canada
Posts: 900
Rep Power: 149
Engine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond reputeEngine Guy has a reputation beyond repute
Originally Posted by joetwint View Post
With my car making alot more whp than it was when it ran 231 i think its easily capable of going over 240 i just dont think the aero is there to do it.At this point i think it would be stupid to take the car back without doing some sort of aerodynamics testing.Getting the car in a wind tunnel with an aero engineer would be the ticket.Making any kind of aero changes without one would just be shooting arrows in the sky and actually is dangerous.I would advise anyone going back to be careful when making aero changes especially with things like flat panel bottoms.the car could just take flight if you get too much air under it or happen to spin sideways.I think one of the easiest and safest aero mods is to rake the car and get the front lower than the rear to keep front end lift to a minimum.I dont want to see anyone get hurt.
Joe there are simple proven changes that even a 1/2 wit idiot could make without worry. The list I made in my prior post has many of them. Especially venting the front fender and closing off the front openings. OK yes they would require some basic though; but a very simple string test would tell you all that you need to know. Even NASA uses string tests to check flow. Here I found this picture and article to show you what I mean if you do not know. I did not read it yet but the picture serves to explain what I mean. And for your viewing pleasure it is even a Porsche. http://www.racingonthecheap.com/aerodynamics/

There are numerous simple books out there on car aero that would coach you through many simple mods that would make a world of difference and if you ever want to try again you can to call me I would be glad to help. I do know a thing or two about the aerodynamics of going fast even if it is meant to take flight or not take flight. The big thing with wanting to not take flight is knowing what to do with multiple air paths coming together, a little knowledge there and a few simple strakes could really help out.

Here is a list of the 7 auto speed articles on the subject, they are actually not all that bad.
Aero testing part one http://www.autospeed.com/A_108656/cms/article.html
Pt 2 http://www.autospeed.com/A_108674/cms/article.html
Pt 3 http://www.autospeed.com/A_108675/cms/article.html

Vortex generators for auto
Pt 1 http://www.autospeed.com/A_3058/cms/article.html
Pt 2 http://www.autospeed.com/A_3059/cms/article.html
Pt 3 http://autospeed.com/A_3060/cms/article.html
Pt 4 http://autospeed.com/cms/A_3061/arti...popularArticle
 

Last edited by Engine Guy; 01-01-2013 at 09:45 AM.
  #30  
Old 01-01-2013, 09:34 AM
joetwint's Avatar
Registered User
Join Date: Dec 2005
Location: new york
Posts: 2,568
Rep Power: 597
joetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond reputejoetwint has a reputation beyond repute
Originally Posted by Engine Guy View Post
Joe there are simple proven changes that even a 1/2 wit idiot could make without worry. The list I made in my prior post has many of them. Especially venting the front fender and closing off the front openings. OK yes they would require some basic though; but a very simple string test would tell you all that you need to know. Even NASA uses string tests to check flow. Here I found this picture and article to show you what I mean if you do not know. I did not read it yet but the picture serves to explain what I mean. And for your viewing pleasure it is even a Porsche. http://www.racingonthecheap.com/aerodynamics/

There are numerous simple books out there on car aero that would coach you through many simple mods that would make a world of difference and if you ever want to try again you can to call me I would be glad to help. I do know a thing or two about the aerodynamics of going fast even if it is meant to take flight or not take flight. The big thing with wanting to not take flight is knowing what to do with multiple air paths coming together, a little knowledge there and a few simple strakes could really help out.
thank you very much for your offer
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Theoretical top speed on a stock tranny?


Join 6SpeedOnline
Visit our Sponsors

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.