C-4 to 150 mph? will it make it
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
Originally Posted by OldCorvetteFan
Carl -
I'm assuming that you have enough horsepower to do the job, as the LT1 Vette's were supposedly able to run about 160 - 165 with a 300 HP engine. Since you have an engine with more HP than an LT1, then you should be OK.
Now, to your other question ...
These are the forumulas you need:
Velocity = (60*pi*Tire_Diameter*RPM)/(63360*Trans_Ratio*Rear_Ratio)
RPM = (63360*Trans_Ratio*Rear_Ratio*Velocity)/(60*pi*Tire_Diameter)
pi is approximately equal to 3.1416
I also used 25" as your tire diameter. You should actually measure the tire, and this calculation ignores tire diameter increase with increases in velocity (and it may not matter on the salt anyway due to the 10% slippage)
If you assume a 10% slippage, then you need to be going an indicated 165 MPH to just cross 150 MPH. An indicated 165 MPH translates to just over 6800 RPM in third (1:1), and just over 4800 RPM in OD (0.68:1).
What I can't answer is whether you have enough distance in the run to get the engine to that speed. We'd have to know more details about the HP/torque curve of your engine, and then take into account the increasing drag on the car as you accelerate up to max speed.
I hope what I provided at least gives you some help!
Steven
I'm assuming that you have enough horsepower to do the job, as the LT1 Vette's were supposedly able to run about 160 - 165 with a 300 HP engine. Since you have an engine with more HP than an LT1, then you should be OK.
Now, to your other question ...
These are the forumulas you need:
Velocity = (60*pi*Tire_Diameter*RPM)/(63360*Trans_Ratio*Rear_Ratio)
RPM = (63360*Trans_Ratio*Rear_Ratio*Velocity)/(60*pi*Tire_Diameter)
pi is approximately equal to 3.1416
I also used 25" as your tire diameter. You should actually measure the tire, and this calculation ignores tire diameter increase with increases in velocity (and it may not matter on the salt anyway due to the 10% slippage)
If you assume a 10% slippage, then you need to be going an indicated 165 MPH to just cross 150 MPH. An indicated 165 MPH translates to just over 6800 RPM in third (1:1), and just over 4800 RPM in OD (0.68:1).
What I can't answer is whether you have enough distance in the run to get the engine to that speed. We'd have to know more details about the HP/torque curve of your engine, and then take into account the increasing drag on the car as you accelerate up to max speed.
I hope what I provided at least gives you some help!
Steven
Well, THAT IS something! Good going, Steven.
Team Owner
Joined: Mar 2001
Posts: 30,845
Likes: 291
From: Boston, Dallas, Detroit, SoCal, back to Boston MA
C&D hit 173 with a stock LT1, but that was a lot longer run than a mile (4 as I recall )
Best of luck.
BTW I worked on one salt flat car every nut was rusted to a different size by the salt
So make sure you rinse her off after the run.
Best of luck.
BTW I worked on one salt flat car every nut was rusted to a different size by the salt
So make sure you rinse her off after the run.
Burning Brakes
Joined: Jun 2001
Posts: 952
Likes: 337
From: Cedar Rapids IA
One of the guys in the GSRegisry had a photo posted of his GPS showing either an indicated or a top speed reached capture of 182 from his GS with the major modification to the LT4 being an aftermarket exhaust system (no headers). This would indicate that a C4 with roughly 300 rwhp should probably be capable of the 150mph on the salt. If I recall correctly this was at the Silver State Classic or another open road run. Good luck on your attempts.. Both the 150 and the 200 mph. Godspeed.
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Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Originally Posted by Carl Johansson
The C-4 makes the 130 mph club easily - 1 mile standing start - on
the salt (estimates are you loose 10 % to the salt - your wheels have
to be turning at over 140 mph to time out over 130).
The question is - will the C-4 have what it takes to make 150.
this is a 2 mile runup with the speed taken after the 2 miles.
the salt (estimates are you loose 10 % to the salt - your wheels have
to be turning at over 140 mph to time out over 130).
The question is - will the C-4 have what it takes to make 150.
this is a 2 mile runup with the speed taken after the 2 miles.
OrangeC6 - "Maxton ECTA AA/GT record at 201.82 MPH in '06"
SonnyinVA - "174mph in the standing mile in '05"
Jeffyvette - "Last July I had 204 through the first trap "
200mph this weekend? SonnyinVA - "174mph in the standing mile in '05"
Jeffyvette - "Last July I had 204 through the first trap "
I set 2 Land Speed Records this weekend!! .
I don't recall whether Sonny has written about unexpected events
at speed, but Orange and esp Jeffy have.
.
Last edited by Slalom4me; Aug 1, 2006 at 07:22 AM.
Pro
Joined: Jun 2001
Posts: 656
Likes: 0
From: Fort Worth TX
Hey Carl not sure if this is important to you but speed week at the Bonniville Salt Flats starts Aug 12 thru Aug 18 . I have my plane tickets in hand will land in Salt Lake City on Aug 11 and be out at the Salt Flats on Aug 12th.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by Carl Johansson
- a 4500 ft elevation (actually an advantage) and a density altitude that often exceeds 8000 ft .
carl Johansson
carl Johansson
The last time I drag raced at sea level (in about 600' DA air, actually) my car ran 1 full second quicker than my best home track ET.
The power you lose, running at altitude, is more than the reduction of the power requirements.
RACE ON!!!
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
Originally Posted by JCD
well, might as well ask the boss... when you doing the race?
World of speed is put on by Utah Salt Flats Racing Association - in the middle of sept - 13 - 16th this year - cooler temps and a much smaller group of racers makes it alot more fun.
here's their link
http://www.saltflats.com/
you will see stuff for the 130 and150 mph clubs on the site.
You get to the Salt Lake Airport - I'll make sure you get out to the flats - and have a car to drive!
Carl Johansson
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
I do keep track of these guys and they have been helpfull to me. Right now I'm trying to get JeffyVettes Navigator to school me before the Sand Hills Open road race in a couple of weeks - I'll be driving 1 way - and navigating on the return leg!
Carl Johansson
Carl Johansson
Originally Posted by Slalom4me
You should hook up with CF members
I set 2 Land Speed Records this weekend!! .
I don't recall whether Sonny has written about unexpected events
at speed, but Orange and esp Jeffy have.
.
OrangeC6 - "Maxton ECTA AA/GT record at 201.82 MPH in '06"
SonnyinVA - "174mph in the standing mile in '05"
Jeffyvette - "Last July I had 204 through the first trap "
200mph this weekend? SonnyinVA - "174mph in the standing mile in '05"
Jeffyvette - "Last July I had 204 through the first trap "
I set 2 Land Speed Records this weekend!! .
I don't recall whether Sonny has written about unexpected events
at speed, but Orange and esp Jeffy have.
.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Carl
Are OrangeC6's mud flaps an aero advantage?
Might be helpful to know if it looks like hitting the target is going
to be close.
Image of OrangeC6's record holder
.
Are OrangeC6's mud flaps an aero advantage?
Might be helpful to know if it looks like hitting the target is going
to be close.
Image of OrangeC6's record holder
.
Last edited by Slalom4me; Aug 2, 2006 at 01:05 AM.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
Originally Posted by cajun86
Hey Carl not sure if this is important to you but speed week at the Bonniville Salt Flats starts Aug 12 thru Aug 18 . I have my plane tickets in hand will land in Salt Lake City on Aug 11 and be out at the Salt Flats on Aug 12th.
Sorry I'll miss ya - if you want to come to World of Speed - I can hook you up!
Carl
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
Originally Posted by Slalom4me
Carl
Are OrangeC6's mud flaps an aero advantage?
Might be helpful to know if it looks like hitting the target is going
to be close.
Are OrangeC6's mud flaps an aero advantage?
Might be helpful to know if it looks like hitting the target is going
to be close.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Just so there is no misunderstanding, I remarked about the
mud flaps to draw attention to them. I hadn't noticed the
flaps at first and these just enhance how streetable the car
appears to be.
.
mud flaps to draw attention to them. I hadn't noticed the
flaps at first and these just enhance how streetable the car
appears to be.
.
