| [ Total Views: 961 | Total Replies: 9 | Thread Id: 91402 ] |
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 Fastie
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| posted on July 5th, 2011 at 12:26 PM |
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Diff ratios
I'm pretty close to ordering a Racho street pro. Just wondering if someone could tell me the difference in revs sitting at 100kph between 4.1 and
3.8.
3.8 is a $400 upgrade.
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bus914
Custom Title Time!
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| posted on July 5th, 2011 at 08:47 PM |
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Just out of interest, how much is shipping?
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Fastie
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| posted on July 6th, 2011 at 05:49 PM |
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$59/ You can get them from Mick motors in QLD
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68AutoBug
A.k.a.: Lee Noonan
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 posted on July 6th, 2011 at 07:33 PM |
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| Quote: | Originally
posted by Fastie
I'm pretty close to ordering a Racho street pro. Just wondering if someone could tell me the difference in revs sitting at 100kph between 4.1 and
3.8.
3.8 is a $400 upgrade.
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Hi
3.88 TO 1 AND 4.125 TO 1
DON'T know the speed differences offhand
but the $400 is too expensive...
use larger tyres instead
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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tweety
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| posted on July 8th, 2011 at 10:20 PM |
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Going to larger tyres?
use this calculator
http://www.tacomaworld.com/forum/tirecalc.php
but wouldnt he want to go to smaller tyres?
going from 4.1 to 3.8 means he wants to lower the gearing...make it take off quicker, less top speed etc.
From a novice...
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Craig Torrens
A.k.a.: Craig Torrens
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6 times Australian, 7 times State Hillclimb Class Champion
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| posted on July 8th, 2011 at 11:01 PM |
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| Quote: | Originally
posted by Fastie
I'm pretty close to ordering a Racho street pro. Just wondering if someone could tell me the difference in revs sitting at 100kph between 4.1 and
3.8.
3.8 is a $400 upgrade.
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About 6-7% difference.............so if at 100kph it was at 3000rpm with the 4.1 diff, then the revs will drop to 2830rpm with the 3.8 diff.
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Craig Torrens
A.k.a.: Craig Torrens
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| posted on July 8th, 2011 at 11:04 PM |
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| Quote: | Originally
posted by tweety
going from 4.1 to 3.8 means he wants to lower the gearing...make it take off quicker, less top speed etc.
From a novice...
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No, going from a 4.1 to 3.8 is making the gearing higher.........higher top speed, slower take off.
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 matberry
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Go hard or go home
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| posted on July 8th, 2011 at 11:04 PM |
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With 26" rear tyres and .82 top, 4.125 diff gives 3000 rpm=109.8km/h, and a 3.88 diff, 3000 rpm=116.7km/h; with a .89 top and same 26" rubber, a
4.125 diff gives 3000 rpm=101.2 km/h and 3.88, 3000 rpm=107.6 km/h
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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HappyDaze
A.k.a.: Greg Mackie
Son of Jim - Creator of Good
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| posted on July 9th, 2011 at 08:37 AM |
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Well done Matt. I'm sure that is EXACTLY what Fastie wanted to
know - no bullshit, just the facts!
I'd rather wear a Beetle out by racing it than by polishing it!
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Fastie
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| posted on July 12th, 2011 at 08:03 AM |
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Exactly. Cheers mate
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