245/45 r17

evokillinSTi · 08-04-2006, 01:40 AM

so if i have this size of tires does that mean my 1/4 mile time will be faster or slower compared to a 225/45 tire?

**T3h_Clap** · 08-04-2006, 07:50 AM

you'll be slower.

more weight, the grip isn't always a good thing in the quarter mile.

good job on making your car slower.

rankink75 · 08-04-2006, 08:05 AM

Slower with everything else equal usually. Taller tires means it can not accelerate as quickly.

awd4life · 08-04-2006, 10:52 AM

slower to accelerate but better torque transfer to the ground due to the difference in gearing and the circuference of the tire being larger. if you were spinning tires before it wouldn't be as severe w/ that size. you might actually trap at a higher speed and maintain your pre-tire size change e.t. due to the difference in gearing making it possible to roll out 4th gear further to the end of the track.

rankink75 · 08-04-2006, 02:13 PM

In 4th gear your mph difference between the 245/45 and stockers would be about 1 mph quicker. But that may be offset by slower acceration off the line. I prefer the shorter tire.

jph · 08-04-2006, 02:36 PM

i went with 245/40R17's

at 4 lbs less per tire than the re070's

J.

evokillinSTi · 08-04-2006, 10:31 PM

i did notice i didnt have to go into 5th gear at the track, is that good or bad, but i did get better traction off the launch!

jph · 08-04-2006, 11:59 PM

Quote:

Originally Posted by evokillinSTi

i did notice i didnt have to go into 5th gear at the track, <b>is that good or bad</b>, but i did get better traction off the launch!

what did your timeslip say ?

J.

the ambush · 08-15-2006, 08:06 AM

doesn't more traction mean better chance to break something off the line??

personnally i'd rather have less traction (still it's an awd) and higher trap speed as this means better acceleration (as on the highway).

smurfm3 · 08-19-2006, 03:19 PM

245/45R17's are useful at an autocross where you don't want to shift to 3rd and then have to shift to 2nd again.

In the 1/4 mile, they are probably slowing you down.

08-04-2006, 01:40 AM	#1
evokillinSTi Junior STI Driver Car: 05 subaru wrx sti Fav Mod: Ecutek Reflash Location: coachella valley Posts: 176 IWSTI Addict since: Apr 2006 Trader Rating: (1)	245/45 r17 so if i have this size of tires does that mean my 1/4 mile time will be faster or slower compared to a 225/45 tire? This ad is not endorsed by this member. Please register or login to hide this ad.

08-19-2006, 03:19 PM	#10
smurfm3 Grassroots STI Racer Car: 05 STi, 04 M3, 90 Sp Fav Mod: Clear bra Location: Pleasanton, CA Posts: 565 IWSTI Addict since: Mar 2005 Trader Rating: (1)	245/45R17's are useful at an autocross where you don't want to shift to 3rd and then have to shift to 2nd again. In the 1/4 mile, they are probably slowing you down. This ad is not endorsed by this member. Please register or login to hide this ad.

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08-04-2006, 07:50 AM	#2
T3h_Clap Wheel33tist Whore Car: Aspen White GDF-D Fav Mod: Pastelito Racing / SFSOC Location: 0R!4ND0 Posts: 21,523 IWSTI Addict since: Dec 2004 Trader Rating: (7)	you'll be slower. more weight, the grip isn't always a good thing in the quarter mile. good job on making your car slower.

08-04-2006, 08:05 AM	#3
rankink75 Junior STI Driver Car: 05 Subaru WRX STi Fav Mod: SFSOC / Pastelito Racing Location: Coral Gables, FL Posts: 199 IWSTI Addict since: Mar 2005 Trader Rating: (0)	Slower with everything else equal usually. Taller tires means it can not accelerate as quickly.

08-04-2006, 10:52 AM	#4
awd4life Junior STI Driver Car: 04 STi Fav Mod: co-pilot Posts: 132 IWSTI Addict since: Jan 2006 Trader Rating: (0)	slower to accelerate but better torque transfer to the ground due to the difference in gearing and the circuference of the tire being larger. if you were spinning tires before it wouldn't be as severe w/ that size. you might actually trap at a higher speed and maintain your pre-tire size change e.t. due to the difference in gearing making it possible to roll out 4th gear further to the end of the track.

08-04-2006, 02:13 PM	#5
rankink75 Junior STI Driver Car: 05 Subaru WRX STi Fav Mod: SFSOC / Pastelito Racing Location: Coral Gables, FL Posts: 199 IWSTI Addict since: Mar 2005 Trader Rating: (0)	In 4th gear your mph difference between the 245/45 and stockers would be about 1 mph quicker. But that may be offset by slower acceration off the line. I prefer the shorter tire.

08-04-2006, 02:36 PM	#6
jph S204 Racer Car: the wagon Location: San Jose, CA Posts: 3,146 IWSTI Addict since: Apr 2004 Trader Rating: (9)	i went with 245/40R17's at 4 lbs less per tire than the re070's J.

08-04-2006, 10:31 PM	#7
evokillinSTi Junior STI Driver Car: 05 subaru wrx sti Fav Mod: Ecutek Reflash Location: coachella valley Posts: 176 IWSTI Addict since: Apr 2006 Trader Rating: (1)	i did notice i didnt have to go into 5th gear at the track, is that good or bad, but i did get better traction off the launch!

08-15-2006, 08:06 AM	#9
the ambush Senior STI Driver Car: 06 sti wrb Fav Mod: trading the svt for an sti Location: canada Posts: 330 IWSTI Addict since: Nov 2005 Trader Rating: (0)	doesn't more traction mean better chance to break something off the line?? personnally i'd rather have less traction (still it's an awd) and higher trap speed as this means better acceleration (as on the highway).