200mph?
Race Director
Joined: May 2001
Posts: 14,165
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Tire size plays a role too. If you're running stock 275/40/17's you can't do 200 in 5th at 6500 RPM's.
If you have something that can open a Microsoft Excel spreadsheet you might want to take a look at this, you should find it very interesting.
http://www.wku.edu/~nathan.plemons/calc.xls
If you have something that can open a Microsoft Excel spreadsheet you might want to take a look at this, you should find it very interesting.
http://www.wku.edu/~nathan.plemons/calc.xls
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Yes, no, maybe.
I tried to modify the spreadsheet once to add another transmission choice and it absolutely would not take it. Apparently I reached a limitation of Excel. As such I can put in any gear ratios I want but I have to replace an existing transmission choice. The 4+3 also gets complicated again by the overdrive that can be engaged in different gears. It's not compltely impossible but it doesn't really fit my existing setup. If you know the gear ratios and overdrive ratio's I'll gladly put it into a sheet for you, it just won't be exactly like the one you're looking at.
I tried to modify the spreadsheet once to add another transmission choice and it absolutely would not take it. Apparently I reached a limitation of Excel. As such I can put in any gear ratios I want but I have to replace an existing transmission choice. The 4+3 also gets complicated again by the overdrive that can be engaged in different gears. It's not compltely impossible but it doesn't really fit my existing setup. If you know the gear ratios and overdrive ratio's I'll gladly put it into a sheet for you, it just won't be exactly like the one you're looking at.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
That's showing you theoretical speed, redline limited in top gear, which doesn't apply to any car really.
There might be an aero limit first, and where that speeds lands on the power band is important too. If you aren't drag or horsepower limited, than a taller gear is in order.
i have a spreadsheet kicking around here somewhere that i made for a college course, adds in aero/tire drag, the dyno curve, and everything on yours to simulate a 0-60 run or 1/4 mile or top speed, or whatever you need.
There might be an aero limit first, and where that speeds lands on the power band is important too. If you aren't drag or horsepower limited, than a taller gear is in order.
i have a spreadsheet kicking around here somewhere that i made for a college course, adds in aero/tire drag, the dyno curve, and everything on yours to simulate a 0-60 run or 1/4 mile or top speed, or whatever you need.
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Actually provided that there is no slippage in the drivetrain it's extremely accurate. If there is an aerodynamic issue the engine won't be able to reach a given RPM, hence the problem you run into in 6th gear.
It's not intended to be the end all, just the theoretical top speed for a given RPM / tire size / gear ratio / trans. Believe it or not it's VERY accurate.
Motor trend test a 1992 for top speed and got 172 MPH out of it. The sheet which is set up for a 92 lists 171 at 5800 RPM in 5th gear. Top speeds for any given gear are dead on at the track. For my case with a 6500 RPM red line that gives 111 in third. I do have to shift into 4th at the track, for a few feet. When I was only making enough power to trap 112 it didn't matter because I was shifting as I crossed the traps.
Granted there are lots of issues but assuming no slippage of the tire or the drivetrain, the math is very correct.
It's not intended to be the end all, just the theoretical top speed for a given RPM / tire size / gear ratio / trans. Believe it or not it's VERY accurate.
Motor trend test a 1992 for top speed and got 172 MPH out of it. The sheet which is set up for a 92 lists 171 at 5800 RPM in 5th gear. Top speeds for any given gear are dead on at the track. For my case with a 6500 RPM red line that gives 111 in third. I do have to shift into 4th at the track, for a few feet. When I was only making enough power to trap 112 it didn't matter because I was shifting as I crossed the traps.
Granted there are lots of issues but assuming no slippage of the tire or the drivetrain, the math is very correct.
Thread Starter
Melting Slicks
Joined: Mar 1999
Posts: 2,535
Likes: 2
From: Rochester NY
Originally Posted by SurfnSun
Bruce,
Id check into Rippie's Wilwood package or some big Brembos. Ive heard really mixed reviews about that dual caliper setup. JeffVette has the Porsche Brembo system on his ZR1...its a sweet setup.
Id check into Rippie's Wilwood package or some big Brembos. Ive heard really mixed reviews about that dual caliper setup. JeffVette has the Porsche Brembo system on his ZR1...its a sweet setup.
Thank you for every one inputs. Regarding which brakes is better. I don't much about wilwood brake. But base on what TJWong told me in the pass, that his dual caliper 13" performs way better than the big Brembo brake. He says has driven car with brembo brake and they are not as good as dual caliper brake.
Decision decision.
Bruce
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by Nathan Plemons
Granted there are lots of issues but assuming no slippage of the tire or the drivetrain, the math is very correct.
Now that we're on subject, anyone have some dyno curves I can plug into my spreadsheet? I'd like to test it out against actual 1/4 mile times. I even added in things like clutch slippage and shift delay.
Melting Slicks
Joined: Jul 2000
Posts: 2,112
Likes: 2
From: Peoria IL
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Team Owner
Joined: Aug 1999
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St. Jude Donor '10
Originally Posted by Bruce
Thank you for every one inputs. Regarding which brakes is better. I don't much about wilwood brake. But base on what TJWong told me in the pass, that his dual caliper 13" performs way better than the big Brembo brake. He says has driven car with brembo brake and they are not as good as dual caliper brake.
Decision decision.
Bruce
Decision decision.
Bruce
Bruce,
I have a buddy with a Doug Rippie DRM600 ZR1...he has the Wilwoods and said the pedal is way more firm than the Brembo packages he's driven. FWIW.
If i was going to push 200mph, I would certainly want a bigger/meatier than stock rotor to help get me slowed down, regardless of how many calipers I had on it.
Last edited by SurfnSun; Feb 18, 2005 at 09:20 AM.
Burning Brakes
Joined: Oct 2004
Posts: 1,019
Likes: 1
From: Weymouth Dorset
Originally Posted by korvetkeith
Me thinks that was in Km/H.
you didnt think that was on the road .......did you ???
there is a car mag called Redline over here in the UK and there is a section in it where ricers can post in pics of their speedos while they are going as fast as their little cars will go ( 130 / 145 mph usually ) so I thought I would post in this pic just to upset them
Le Mans Master
Joined: May 2005
Posts: 5,214
Likes: 65
From: Queensland, AUSTRALIA
Originally Posted by korvetkeith
Hey Bruce here's something to think about, you'll have about 300hp more than the Sledgehammer
Last edited by Casethecorvetteman; Jul 15, 2005 at 11:32 AM.
Race Director
Joined: Feb 2001
Posts: 13,911
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From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
Originally Posted by CentralCoaster
I don't doubt it one bit.
Now that we're on subject, anyone have some dyno curves I can plug into my spreadsheet? I'd like to test it out against actual 1/4 mile times. I even added in things like clutch slippage and shift delay.
Now that we're on subject, anyone have some dyno curves I can plug into my spreadsheet? I'd like to test it out against actual 1/4 mile times. I even added in things like clutch slippage and shift delay.
Race Director
Joined: May 2000
Posts: 17,101
Likes: 4
From: No more yankee my wankee, the Donger is tired!
Originally Posted by Bruce
Thank you for every one inputs. Regarding which brakes is better. I don't much about wilwood brake. But base on what TJWong told me in the pass, that his dual caliper 13" performs way better than the big Brembo brake. He says has driven car with brembo brake and they are not as good as dual caliper brake.
Decision decision.
Bruce
Decision decision.
Bruce
Le Mans Master
Joined: Aug 2002
Posts: 6,080
Likes: 3
From: Clearwater FL
St. Jude Donor '06
Originally Posted by adi4
BTW cf member ericcer has the dual a/o caliper setup and loves it.
Burning Brakes
Joined: Sep 2003
Posts: 875
Likes: 0
From: Louisville KY
Originally Posted by korvetkeith
Me thinks that was in Km/H.
keep the stories commin!
Last edited by kpforce1; Jul 15, 2005 at 03:04 PM.
Race Director
Joined: May 2000
Posts: 17,101
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From: No more yankee my wankee, the Donger is tired!
Originally Posted by C4DC
BTW cf member ericcer has the dual a/o caliper setup and loves it.
http://forums.corvetteforum.com/show...94&forum_id=34