Evo VIII vs Evo IX gearing
Feb 16, 2007, 02:12 PM
#17
There's no exact difference, but you're generally much higher on the speedo than what you see on the traps. Of course, the speedo isn't 100% accurate either, so the only way to really know is if maybe you are using GPS to determine your true MPH at the finish line.
Anyway, when I trap around 110, my speedo is up around 115. Also, as you see above, 7600rpm on the 6spd 4th gear is 114.3mph, but I could never trap higher than 110.7, and I bounced off the rev limiter MANY TIMES at the end of 4th before I finally got a flash to raise it.
Anyway, when I trap around 110, my speedo is up around 115. Also, as you see above, 7600rpm on the 6spd 4th gear is 114.3mph, but I could never trap higher than 110.7, and I bounced off the rev limiter MANY TIMES at the end of 4th before I finally got a flash to raise it.
Feb 16, 2007, 02:18 PM
#18
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There's no exact difference, but you're generally much higher on the speedo than what you see on the traps. Of course, the speedo isn't 100% accurate either, so the only way to really know is if maybe you are using GPS to determine your true MPH at the finish line.
Anyway, when I trap around 110, my speedo is up around 115. Also, as you see above, 7600rpm on the 6spd 4th gear is 114.3mph, but I could never trap higher than 110.7, and I bounced off the rev limiter MANY TIMES at the end of 4th before I finally got a flash to raise it.
Anyway, when I trap around 110, my speedo is up around 115. Also, as you see above, 7600rpm on the 6spd 4th gear is 114.3mph, but I could never trap higher than 110.7, and I bounced off the rev limiter MANY TIMES at the end of 4th before I finally got a flash to raise it.
Feb 16, 2007, 02:29 PM
#21
245w tires will help a couple MPH through the traps.
When I bought this car, I knew making the power my other car did would be useless for drag racing, so I'd rather go with a Buschur 20G 9 LT turbo on this one. That way, the turbo is fat in the midrange and not peaky like the GT30 series.
The IX 3rd and especially 4th gears are depressing. I think a TRE/Shep freshening of my tranny someday with VIII 3rd and 4th is in order!
Part of me wants the VIII 5th back for fuel economy, but the car would really benefit with this 5th gear and the taller 4th if you ever make really big power and have no choice but to go to 5th (127mph traps plus on the VIII 5 speed beyond 7800rpm).
When I bought this car, I knew making the power my other car did would be useless for drag racing, so I'd rather go with a Buschur 20G 9 LT turbo on this one. That way, the turbo is fat in the midrange and not peaky like the GT30 series.
The IX 3rd and especially 4th gears are depressing. I think a TRE/Shep freshening of my tranny someday with VIII 3rd and 4th is in order!
Part of me wants the VIII 5th back for fuel economy, but the car would really benefit with this 5th gear and the taller 4th if you ever make really big power and have no choice but to go to 5th (127mph traps plus on the VIII 5 speed beyond 7800rpm).
Feb 16, 2007, 02:39 PM
#23
Warrtalon, I echo what you just said. You are responsing faster than me, you are pulling the same words I had in my mind.
Noize,
You can't just use the width of a tire, you must also consider the profile of a tire(35/40/45/50 etc). For that matter I could have a 245/35 on 13"x8.5" rims and get a much smaller overall diameter than the stock configuration(235/45/17).
Totally agree with you Clayton.
Carlos
Noize,
You can't just use the width of a tire, you must also consider the profile of a tire(35/40/45/50 etc). For that matter I could have a 245/35 on 13"x8.5" rims and get a much smaller overall diameter than the stock configuration(235/45/17).
Totally agree with you Clayton.
Carlos
Feb 16, 2007, 02:47 PM
#24
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I'm wondering if when TRE redid my transmission he changed my gearing.
when im in 4th finishing up the 1/4 im usually right on top of my rev limiter, between 7700-7800 when i trap 110.6. my highest trap to date is 110.8 and i bounced right off the rev limiter when i did so. how is that possible?
when im in 4th finishing up the 1/4 im usually right on top of my rev limiter, between 7700-7800 when i trap 110.6. my highest trap to date is 110.8 and i bounced right off the rev limiter when i did so. how is that possible?
Feb 16, 2007, 03:52 PM
#25
Carlos and Clay, when I say 245w, I mean OEM +1, which I assumed would be understood.
So instead of 235/45/17, you'd run 245/45/17 in my example. This will slightly increase the tire diameter. Take a generic tire (in this case one none of us would run on an Evo), a Hankook Ventus V4 Es H105. Its overall diameter in 235/45/17 is 25.4. The identical tire in 245/45/17 is 25.7. Source: Edge Racing.
For the sake of argument, the OEM Advans are exactly 25.33
Our test car will be an Evo IX 5 speed spinning to a reflashed rev limit of 7800rpm in 4th gear, and here is the MPH the car would be at, assuming full tread:
Advans: 119.1mph
Factory sized Hankooks: 119.4mph
245/45/27 Hankooks: 120.8mph
This can get even more confusing, because all tires are not mathematically the exact same size, or more accurately, their diameters don't follow the formula perfectly. That is to say, there is variance in tire to tire size slightly among different brands. Hankooks tend to be a little larger than others, which is helpful to those of us wanting to hold fourth.
So to show a more concrete example, the Hankook Ventus RS2, an economical great performance tire an Evo guy would very likely run, is only available in 245/45/17. Its the identical diameter to the same sized Hankook in my above example, and will provide nearly 2mph more at the rev limiter in a 5 speed IX's 4th.
Clear as mud now?
So instead of 235/45/17, you'd run 245/45/17 in my example. This will slightly increase the tire diameter. Take a generic tire (in this case one none of us would run on an Evo), a Hankook Ventus V4 Es H105. Its overall diameter in 235/45/17 is 25.4. The identical tire in 245/45/17 is 25.7. Source: Edge Racing.
For the sake of argument, the OEM Advans are exactly 25.33
Our test car will be an Evo IX 5 speed spinning to a reflashed rev limit of 7800rpm in 4th gear, and here is the MPH the car would be at, assuming full tread:
Advans: 119.1mph
Factory sized Hankooks: 119.4mph
245/45/27 Hankooks: 120.8mph
This can get even more confusing, because all tires are not mathematically the exact same size, or more accurately, their diameters don't follow the formula perfectly. That is to say, there is variance in tire to tire size slightly among different brands. Hankooks tend to be a little larger than others, which is helpful to those of us wanting to hold fourth.
So to show a more concrete example, the Hankook Ventus RS2, an economical great performance tire an Evo guy would very likely run, is only available in 245/45/17. Its the identical diameter to the same sized Hankook in my above example, and will provide nearly 2mph more at the rev limiter in a 5 speed IX's 4th.
Clear as mud now?
Last edited by Noize; Feb 16, 2007 at 03:58 PM. Reason: Example included
Feb 16, 2007, 05:48 PM
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yes you can put an evo 8 4th in an evo 9 and be done with it. I think they run around $200.
I'm wondering if when TRE redid my transmission he changed my gearing.
when im in 4th finishing up the 1/4 im usually right on top of my rev limiter, between 7700-7800 when i trap 110.6. my highest trap to date is 110.8 and i bounced right off the rev limiter when i did so. how is that possible?
when im in 4th finishing up the 1/4 im usually right on top of my rev limiter, between 7700-7800 when i trap 110.6. my highest trap to date is 110.8 and i bounced right off the rev limiter when i did so. how is that possible?
Feb 16, 2007, 05:51 PM
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I have a 9 and with the limiter set at 7800 I bang the limiter right as I cross the line. Which resulted in 114.x-115.x mph. I have now bumped the limiter to 8500(just so I don't hit it in 4th) and last time out I went 117mph but I couldn't tell for sure what the rpm was.
This was on the stock wheels and tires
This was on the stock wheels and tires
