jlewis02
Expert Class
Posts: 195
|
posted July 13, 2010 07:26 PM
Time for 5k feet above sea level
I have to ask on here.
What do you think an 08 ZX14 will run in the 1/4mile at 5k feet above sea level?
Mods PC3,BMC filter,Butterflys removed,Full muzzy system
Stock height and wheelbase stock gearing.
Rider weight is 155lbs suited.
____________
08 ZX14
1.57 60'
6.09@124
9.24@155
SWB 5400ft DA 50hp shot
  
|
CraigChrist
Pro
BAWLS
Posts: 1043
|
posted July 14, 2010 10:30 AM
I ran roughly 6.30 in the 1/8th @115mph at that altitude with my bike lowered on the second hole on my 3 hole links, brocks smeg, pc3, stock air filter, flies removed, and the front end strapped, but that was with a 16t front sprocket that really fucked up my 60ft and 330ft.
Stock height is going to really kick your ass, and the altitude is going to add roughly .25 to your time and kill around 5mph, so I would say that you will probably run 10.2-10.5 if you haven't ever taken it down a track but are a fairly competent rider.
I think my first trip ever to the track on a bike which was my 07, I ran 6.7 in the 1/8th on like 1.7 60fts factory showroom stock.
The bike itself is capable of running faster than that, but if you haven't ever been on a track before you'll soon learn that drag racing is not as easy as it looks. Take it easy the first couple of runs until you get used to the track, lights, etc.
Have you ever raced before? what's your background?
____________
60ft-------1.42
1/8th------5.97
mph-------119
|
NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
|
posted July 14, 2010 03:42 PM
It know some guys that run at that altitude, and they think they are flying when they get to 1900 and 2000 ft.........
We are at like 300 ft at our tracks here, in a river valley........
When I go up to OK, at Tulsa, and Noble, if I run my bike all out, I lose about .1 to .15, just from that altitude change........
So, keep that in mind.........
I would assume 5.9s and 6.0s is FLYING at that altitude on a stock motor.
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
Conway Cycle
Syed Leathers
|
CraigChrist
Pro
BAWLS
Posts: 1043
|
posted July 14, 2010 11:44 PM
yeah, it takes me low 1.4's to get 5.8-5.9 at 64" at our track in 3500-4000ft air lol.
____________
60ft-------1.42
1/8th------5.97
mph-------119
|
almost_les
Zone Head
Posts: 590
|
posted July 15, 2010 12:38 PM
im at 4200' actual and i've seen 14's only able to hit around 140mph on motor, and those are the ones with light riders.
|
Rossi
Novice Class
Posts: 77
|
posted July 19, 2010 08:54 PM
I'm almost 6500 ft. racing at pikes peak and still hitting 9's with the 12. I've spoke to a lot of the mechanics at the bike shops and the general consensus is you lose 20% for every 5000 ft.. So I've lost 25% but a little timing advance and dumping a little more fuel on the pc will get you set up.
|
dougmeyer
Needs a job
moderated
Posts: 2713
|
posted July 21, 2010 10:51 AM
Air is actually 17% less dense at 5000 feet, but it's not a linear reduction. The air density at 10,000 feet is 31% less than SL.
But, your power reduction will not be exactly that, but greater because not only is there less oxygen but there is less mass, and flow velocities (volumetric efficiency) are reduced. That's why the "rule of thumb" is a 20% reduction in power at 5000 feet. And that is 5000 feet of Density Altitude, which includes a temperature correction. For example on a 90 degree day, that density altitude of 5000 feet could occur at actual altitude of 4000 feet. If I have a choice between a higher elevation at a lower temp or a lower elevation at a higher temp I'd go for the lower temp because the temperature has more of an effect on density than does altitude.
____________
It's not that I think you're dumb, it's just that so much of what you know isn't true....
|
NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
|
posted July 21, 2010 02:01 PM
Yeah, we saw 4200 ft DA at the last PMRA event.
____________
42 Wins
21 Runner-ups
2010 TMRC Super Street Points Champion
2010 PMRA Super Street #3 Points
2009 PMRA Super Street Points Runner-Up
6 Time Centerville Dragway Points Champion
Sponsored by:
Scorpion Helmets
Galfer Braking
AMSOIL
Steve's Speed Shop
Kawasaki Sports Center
Mickey Thompson Tires
Catalyst Racing Composites
Conway Cycle
Syed Leathers
|
|
|
HOME
NEW TOPIC