1/8th mile to 1/4 mile

Mustangscotty · 06-03-2009, 04:26 AM

Switching from 1/8 mile to a 1/4 mile track, what modifications do you make to your ride or "should be made" to your ride?

A few that come to mind..

gear ratio
parachute

clubracergt1 · 06-03-2009, 06:31 AM

I know that, going from 1/4 to 1/8, not much is changed. I would think that gear ration would not be too big a deal, since it appears that most of the acceleration is done in the 1st 1/8 mile. This may be different in a forced induction car. As far as a parachute goes, I would think that-if you don't need it on the shoter tracks-you won't need one on a long track.

Just my .02. I may be wrong; but I think my logic is sound.

Illusions · 06-03-2009, 06:46 AM

Isn't parachute governed by ET not track length? It would be a rule just like the cage requirements.

Gearing is the main thing I can think of. in the 8th your trying to get the most power out of a short distance. you wouldn't want to run hthe same gear in the 1/4 if your power is finished at the 8th mark. Set your vehicle up for the tracks you run the most.

Bradleyrj · 06-03-2009, 08:29 AM

Quote:

Originally Posted by Illusions

Isn't parachute governed by ET not track length? It would be a rule just like the cage requirements.

Gearing is the main thing I can think of. in the 8th your trying to get the most power out of a short distance. you wouldn't want to run hthe same gear in the 1/4 if your power is finished at the 8th mark. Set your vehicle up for the tracks you run the most.

X2. Parachute is governed by mph. I "believe"...it is once you reach 140 mph in the 1/4 you are required to have a chute. That is if your following the rest of the safety rules hardly anyone ever does. I don't remember what the rule is for trap speed in the 1/8th to require a chute.

Mustangscotty · 06-03-2009, 09:25 AM

Maybe a spoiler adjustment and change the nitrous jets or even add a second stage.
Auto trans, change the stall
run a taller tire?
running longer at top speed, maybe a change in the tune?

slowgreen99 · 06-03-2009, 11:27 AM

8.99999 or better or 150mph

Jeff · 06-03-2009, 11:33 AM

Tire size and gear ratio play a huge factor . Most fast cars you see running 1/8th mile are set up for 1/8th .

My old Cobra with 26" ET Streets and 4.10s couldn't make it through the 1/4 mile . It would bump the rev limiter about 200 ft before the end stripe . I put a 28" tire on it and problem was fixed .

clubracergt1 · 06-03-2009, 12:15 PM

Wow. I guess I didn't realize it made that much of a difference.

LXtasy · 06-03-2009, 12:54 PM

taller tires in theory numerically lowers your gear ratio which means a good bit. just like running too tall of a tire on a vehicle will slow it down.

06-03-2009, 04:26 AM	#1
Mustangscotty Senior Member Join Date: Dec 2007 Posts: 699	1/8th mile to 1/4 mile Switching from 1/8 mile to a 1/4 mile track, what modifications do you make to your ride or "should be made" to your ride? A few that come to mind.. gear ratio parachute __________________ Scotty 67 Mustang fastback 68 Mustang coupe 03 Cobra 13 F150 4x4 69 Harley FLH 67 Camaro

06-03-2009, 06:31 AM	#2
clubracergt1 Senior Member Join Date: Feb 2007 Location: The Great, white North (Chicagoland) Posts: 2,483	I know that, going from 1/4 to 1/8, not much is changed. I would think that gear ration would not be too big a deal, since it appears that most of the acceleration is done in the 1st 1/8 mile. This may be different in a forced induction car. As far as a parachute goes, I would think that-if you don't need it on the shoter tracks-you won't need one on a long track. Just my .02. I may be wrong; but I think my logic is sound. __________________ This space for rent

06-03-2009, 06:46 AM	#3
Illusions Senior Member Join Date: Apr 2008 Location: In the Pits Posts: 2,247	Isn't parachute governed by ET not track length? It would be a rule just like the cage requirements. Gearing is the main thing I can think of. in the 8th your trying to get the most power out of a short distance. you wouldn't want to run hthe same gear in the 1/4 if your power is finished at the 8th mark. Set your vehicle up for the tracks you run the most. __________________ Illusions Grafix A Pair of "Jackstand" 01 Xtreme Blazers

06-03-2009, 09:25 AM	#5
Mustangscotty Senior Member Join Date: Dec 2007 Posts: 699	Maybe a spoiler adjustment and change the nitrous jets or even add a second stage. Auto trans, change the stall run a taller tire? running longer at top speed, maybe a change in the tune? __________________ Scotty 67 Mustang fastback 68 Mustang coupe 03 Cobra 13 F150 4x4 69 Harley FLH 67 Camaro

06-03-2009, 11:27 AM	#6
slowgreen99 Senior Member Join Date: Jan 2008 Location: Summerville Posts: 7,740	8.99999 or better or 150mph __________________ M.R.E. Bad Bob Motorsports

06-03-2009, 11:33 AM	#7
Jeff Senior Member Join Date: Feb 2007 Posts: 1,015	Tire size and gear ratio play a huge factor . Most fast cars you see running 1/8th mile are set up for 1/8th . My old Cobra with 26" ET Streets and 4.10s couldn't make it through the 1/4 mile . It would bump the rev limiter about 200 ft before the end stripe . I put a 28" tire on it and problem was fixed . __________________ Boat .

06-03-2009, 12:15 PM	#8
clubracergt1 Senior Member Join Date: Feb 2007 Location: The Great, white North (Chicagoland) Posts: 2,483	Wow. I guess I didn't realize it made that much of a difference. __________________ This space for rent

06-03-2009, 12:54 PM	#9
LXtasy Senior Member Join Date: Dec 2006 Location: Summerville, SC Posts: 9,564	taller tires in theory numerically lowers your gear ratio which means a good bit. just like running too tall of a tire on a vehicle will slow it down. __________________