1/2 Mile Planning
hey buddy how are you doing?
03-22-2015, 09:09 AM
#22
Burning Brakes
03-25-2015, 06:08 AM
#25
Melting Slicks
Find a gear ratio calculator and decide what will work best for your setup.
There are many combinations possible, but ultimately it's up to you between power, rpm's, transmission, final drive, tyres etc to find a balance that will work for you.
TBH though, the more power you have, the less critical it becomes
There are many combinations possible, but ultimately it's up to you between power, rpm's, transmission, final drive, tyres etc to find a balance that will work for you.
TBH though, the more power you have, the less critical it becomes
03-25-2015, 07:04 AM
#26
Burning Brakes
Find a gear ratio calculator and decide what will work best for your setup.
There are many combinations possible, but ultimately it's up to you between power, rpm's, transmission, final drive, tyres etc to find a balance that will work for you.
TBH though, the more power you have, the less critical it becomes
There are many combinations possible, but ultimately it's up to you between power, rpm's, transmission, final drive, tyres etc to find a balance that will work for you.
TBH though, the more power you have, the less critical it becomes
I like someone to look at my list of specs and tell me what they would have done for best effort and I will try all of them
LoL
Also need to figure out how the best to shift with the Nitrous flowing... short 1-2 then normal cam rpm 3-4 or other way short 3-4 and on the cam 1-2 is how I imporved 10km and that's all 6 mile per hour
looks like only me and you again StevieT
Last edited by C5 Scully; 03-25-2015 at 07:08 AM.
03-25-2015, 07:12 AM
#27
Melting Slicks
All boils down to grip...but speed over distance is the strangest thing.
Last year over 1km runs I had some gearbox issues and couldnt get gears.
On my best 1km run...I missed 3rd and hit 1st by mistake. I effectively lost 120m of track at around 65mph
I ran a 1/4 of around 13.7 at 124mph...BUT I changed into 5th just after the 1/4 ( shifted early from 4th as I had no grip ) and picked up 60mph to trap 184mph over the 1km.
1000hp GTR's were running high 9's or 10 flat in the 144-145mph region over 1/4m, yet only in the 175-180mph range mostly at the 1km mark. Only a couple ran a little more
So they were only picking up 35mph or so over the last 600m using very optimised gearing with super fast shifts.
So sometimes very lazy starts and using big gears to do the work will result in a higher trap, but perhaps a slower elapsed time. But more time on the track is more time to accelerate to a higher speed.
Last year over 1km runs I had some gearbox issues and couldnt get gears.
On my best 1km run...I missed 3rd and hit 1st by mistake. I effectively lost 120m of track at around 65mph
I ran a 1/4 of around 13.7 at 124mph...BUT I changed into 5th just after the 1/4 ( shifted early from 4th as I had no grip ) and picked up 60mph to trap 184mph over the 1km.
1000hp GTR's were running high 9's or 10 flat in the 144-145mph region over 1/4m, yet only in the 175-180mph range mostly at the 1km mark. Only a couple ran a little more
So they were only picking up 35mph or so over the last 600m using very optimised gearing with super fast shifts.
So sometimes very lazy starts and using big gears to do the work will result in a higher trap, but perhaps a slower elapsed time. But more time on the track is more time to accelerate to a higher speed.
03-25-2015, 07:54 AM
#28
Burning Brakes
Sound like a plan and I have run 10.7 1/4 mile off idle and now hae 150hp more with launch controller box but always pulled of low at the 1/2 mile due to a ruff chip finish and no real grip also have on the M/T ET Streets...
Ok so 100 bucks via paypal for the combo that gets me the best speed LOL anybody welcome
And I have losts of room to practice and same test surface :-)
Ok so 100 bucks via paypal for the combo that gets me the best speed LOL anybody welcome
And I have losts of room to practice and same test surface :-)
03-25-2015, 08:00 AM
#29
Melting Slicks
If you have plenty of testing options.
I'd try the usual go fast as **** method...but then I'd also try the lazy roll start, and then get into higher gears earlier and let the torque do the work
It feels like the wrong thing to do, but it may well get a higher trap speed.
I'd try the usual go fast as **** method...but then I'd also try the lazy roll start, and then get into higher gears earlier and let the torque do the work
It feels like the wrong thing to do, but it may well get a higher trap speed.
03-25-2015, 10:00 AM
#30
Le Mans Master
03-25-2015, 10:59 AM
#31
Racer
Thread Starter
How do you feel a 29.5 tire would do in a roll race? Besides the obvious traction advantage it offers off the hit, will it help with top end? I believe one or maybe two guys have asked you behind the scenes on your opinion on the 29.5 tire in roll events. I was just curious what your thoughts were?
03-25-2015, 11:24 AM
#32
Le Mans Master
How do you feel a 29.5 tire would do in a roll race? Besides the obvious traction advantage it offers off the hit, will it help with top end? I believe one or maybe two guys have asked you behind the scenes on your opinion on the 29.5 tire in roll events. I was just curious what your thoughts were?
I can fit a 30" with modified L5 flares & shortened rocker panels
A 30" radial is a lot heavier also, I think you'd be better off with 28's & proper gearing.
03-25-2015, 02:45 PM
#33
Kind of suprised to hear you say that Jay.....402" w/F1x and a T56 on an unpreped surface. I know you have a wealth of experience at that power level...but 1300 rwhp on a 28" on an unpreped surface seems like a lot to ask from a 28.
And according to the net (we know how accurate that can be), the 275 Pro is 32lbs and the Hoosier 295/65-15 is 27lbs.
Btw.....thanks for responding to my pm....and sorry for not respondin back.