Max speed in each gear
#1
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Thread Starter
Join Date: Aug 2003
Location: Thousand Oaks, CA, USA
Posts: 75
Car Info: WR Blue WRX
Max speed in each gear
What are the max speeds in each gear @7000 with the stock tires.
I have gone through and done calculations on what the speeds should be but I am off by a few mph in each gear.
I have an 03 WRX w/5MT
-skooter
I have gone through and done calculations on what the speeds should be but I am off by a few mph in each gear.
I have an 03 WRX w/5MT
-skooter
#4
I did these calculations using a tire size of 225/45VR17, which has a tire diameter of exactly 25 inches. The stock tires have a diameter of 24.9 inches, which equates to .4% smaller. Not much difference. Treadwear differences amount to as much or more.
Thus, the speeds listed in the thread are very very close.
-Mirror
https://www.i-club.com/forums/showth...speed+in+gears
Also, don't count on your factory speedo unless you've had it calibrated. They can be shockingly inaccurate.
Thus, the speeds listed in the thread are very very close.
-Mirror
https://www.i-club.com/forums/showth...speed+in+gears
Also, don't count on your factory speedo unless you've had it calibrated. They can be shockingly inaccurate.
#5
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Thread Starter
Join Date: Aug 2003
Location: Thousand Oaks, CA, USA
Posts: 75
Car Info: WR Blue WRX
Mirror I have been running my car with my friends gtech meter testing the quarter mile and every time I can't hit any higher than 95mph in 3rd.
I have tried countless times to run in 3rd without shifting and I have enven tried going even into the red on the tach. My electronic boost controller monitors speed and rpm and I still can't get any higher than 95 after calc's.
I am going to try to do the grounding mod to try and help make some of the gauges and electronics more accurate.
With the speed I am hitting in each gear after I have done calc's it seems that I have a 4.2 rear axle ratio. I am not sure what happens with the 1.1 rear ratio and if that screws with any thing as far a gearing goes. AWD is so confusing why can't it just be like a standard RWD car and have one ratio... I guess this is the price you pay for traction... Traction definatly worth it..
I have tried countless times to run in 3rd without shifting and I have enven tried going even into the red on the tach. My electronic boost controller monitors speed and rpm and I still can't get any higher than 95 after calc's.
I am going to try to do the grounding mod to try and help make some of the gauges and electronics more accurate.
With the speed I am hitting in each gear after I have done calc's it seems that I have a 4.2 rear axle ratio. I am not sure what happens with the 1.1 rear ratio and if that screws with any thing as far a gearing goes. AWD is so confusing why can't it just be like a standard RWD car and have one ratio... I guess this is the price you pay for traction... Traction definatly worth it..
#6
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Join Date: Dec 2002
Location: Sacramento CA
Posts: 10,029
Car Info: 02 Impreza WRX sedan
Go to a real drag strip. Their timing system is much more accurate than even the g-tech competition pro model. It's a lot safer, too.
You can't turn higher than 95 mph through the (theoretical) traps because you don't have enough power. It isn't gearing-related. MPH trap speed does not vary with small differences in gearing or tire diameter. Those variables can affect E.T. Horsepower and a wide torque curve is what generates the big MPH numbers.
--
0==WW==0
"…axles of evil…" - george w. bush
You can't turn higher than 95 mph through the (theoretical) traps because you don't have enough power. It isn't gearing-related. MPH trap speed does not vary with small differences in gearing or tire diameter. Those variables can affect E.T. Horsepower and a wide torque curve is what generates the big MPH numbers.
--
0==WW==0
"…axles of evil…" - george w. bush
#7
Originally posted by sKOOTeR WRX
Mirror I have been running my car with my friends gtech meter testing the quarter mile and every time I can't hit any higher than 95mph in 3rd.
I have tried countless times to run in 3rd without shifting and I have enven tried going even into the red on the tach. My electronic boost controller monitors speed and rpm and I still can't get any higher than 95 after calc's.
I am going to try to do the grounding mod to try and help make some of the gauges and electronics more accurate.
With the speed I am hitting in each gear after I have done calc's it seems that I have a 4.2 rear axle ratio. I am not sure what happens with the 1.1 rear ratio and if that screws with any thing as far a gearing goes. AWD is so confusing why can't it just be like a standard RWD car and have one ratio... I guess this is the price you pay for traction... Traction definatly worth it..
Mirror I have been running my car with my friends gtech meter testing the quarter mile and every time I can't hit any higher than 95mph in 3rd.
I have tried countless times to run in 3rd without shifting and I have enven tried going even into the red on the tach. My electronic boost controller monitors speed and rpm and I still can't get any higher than 95 after calc's.
I am going to try to do the grounding mod to try and help make some of the gauges and electronics more accurate.
With the speed I am hitting in each gear after I have done calc's it seems that I have a 4.2 rear axle ratio. I am not sure what happens with the 1.1 rear ratio and if that screws with any thing as far a gearing goes. AWD is so confusing why can't it just be like a standard RWD car and have one ratio... I guess this is the price you pay for traction... Traction definatly worth it..
Cheers,
-Mirror
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