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Joined: May 2000
Posts: 21,197
I have no life
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I have no life
Joined: May 2000
Posts: 21,197 |
Originally posted by Keyser:
Point of interest. Bondurant SVT's had Rousche prepped transmissions with the zetec final drive. No big engine mods, just auto crossing. Discuss. 
That's all I needed to hear.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
Joined: Sep 2000
Posts: 9,602 |
Originally posted by kinger:
It does change but the point is that its negligible. The advantages of hole shot alone make this mod worthwile. Hopefully I can get to a track sometime and prove the point.
3.84 to 4.06 = 5.4% change in ratio
Tire size change (per "specs") from 205 to 225 = 3.8% change in ratio. (Actually my measured change from 205/50 to 225/50 KDW was 23.9" to 25.1" or 4.8%)
Both are minor, but also very close to one another.
If you say one is negligible then so is the other...
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Joined: Aug 2001
Posts: 976
Veteran CEG\'er
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Veteran CEG\'er
Joined: Aug 2001
Posts: 976 |
Originally posted by DemonSVT:
Originally posted by kinger:
It does change but the point is that its negligible. The advantages of hole shot alone make this mod worthwile. Hopefully I can get to a track sometime and prove the point.
3.84 to 4.06 = 5.4% change in ratio
Tire size change (per "specs") from 205 to 225 = 3.8% change in ratio. (Actually my measured change from 205/50 to 225/50 KDW was 23.9" to 25.1" or 4.8%)
Both are minor, but also very close to one another.
If you say one is negligible then so is the other...
True if the 225/50 fit, you could live with speedo inaccuracy, wrong odometer readings, etc. If you plus size properly and go to 225/45 it is negligible.
I offer PnP Heads for all durtec's details at PnPheads.com or jesse@pnpheads.com for details.
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Joined: Sep 2000
Posts: 4,693
Hard-core CEG'er
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Hard-core CEG'er
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Check most any tire chart and you will find the a 205/55R16 and a 225/50R16 are the same diameter.
Jim Johnson
98 SVT
03 Escape Limited
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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
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Originally posted by kinger:
True if the 225/50 fit, you could live with speedo inaccuracy, wrong odometer readings, etc. If you plus size properly and go to 225/45 it is negligible.
Actually the 225/50's made everything "finally" read correctly vs the "much smaller" 215/50 I had stock!
Not only that, but 225/45's rub! 
Either way either change is "roughly" the same change. The 1 to maybe 2% difference will never be noticed. You are talking between 20-80rpm difference depending on engine rpm.
However if you combine taller tires with the taller gear you do get a significant drop in gearing.
Either WILL slow you down, both of course will do so more. It's as simple as that.
A car with 4.06's will be slightly quicker than a car with 3.84's. (power level being equal of course)
Also this talk about finishing the 1/4 mile in 3rd (like we have 1/4 mile car anyway  )
Only if you trap 100mph or under and then you can do it with EITHER gear.
With stock 24.1" tires
7800rpm with 3.84's (8k = 101mph)
8050rpm with 4.06's (ok not "ideal", but definitely "possible")
How about wider 25.1" tires & 4.06's @ 7850rpm = 100mph (my setup)
What you say 250FWHP+ traps over 100mph.
Guess your point is moot then  or your tire diameter is NOT stock. If so then the gears made no difference in being able to run it in 3rd except to make your acceleration slower through them. If you can make the 1/4 mile in 3rd then your extra tire diameter on top of the taller gear would make your acceleration potential significantly slower.
Guess only us slow NA guys can make the run in 3rd. 
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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? ?
I'm always into 4th through the 1/4. But then I shift about 6500-6800 usually since it's turbo'd.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Jun 2000
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Hard-core CEG\'er
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Originally posted by Keyser:
Point of interest. Bondurant SVT's had Rousche prepped transmissions with the zetec final drive. No big engine mods, just auto crossing. Discuss.
I would just add that the Bondurant cars were to train drivers NOT win any kind of race. Perhaps the zetec FD was used to keep revs down lower..engine longevity, less tranny wear from "slower" launches, fleet fuel savings...just speculating. But absolute lap times are not a priority in drivers school, just relative improvement in lap times from driver skill increase.
It is true that the touring cars generally used shorter gearing..4.50 or so as mentioned. But they are hot cam N/A engines and do not have the low end torque that 3L/FI cars have so...I do not know the answer to the Q..
1999 Amazon Green SVT Contour (#554/2760)
"People demand freedom of speech as a compensation for the freedom of thought which they seldom use."
-Soren Kierkegaard (as posted by Jato)
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