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| ed_man |
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A friend has a stock EB XR8 running 3.27 gears and would like to know if there is signifigant power improvement changing to 3.45 gears.
thanks ed_man
_________________ God save Allan Moffat, God bless d**k-Johnson and thank Christ for Marcos Ambrose......... |
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| phongus |
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He will get a better launch and when sitting at 100km/hr he will be sitting at higher revs then with a 3.27. Slightly better economy in city driving but that depends on how heavy his foot is. Not sure if the power actually changes, though I know you would have a better launch which will improve the quater times a tad.
phong =P~
_________________ phongus = Post whore 2006 |
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| xr8ute |
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The engine wont make anymore power.
But the shorter gearing will increase torque at the wheels by 5.5%... |
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| voxace |
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I just went from 3.23 to 3.45, and you feel a slight difference.
I only did it to get an LSD in there, not for the ratio change. If he's got an auto the shorter gearing helps, if it's a manual I wouldn't bother. |
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| ed_man |
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His eb is an auto and I think he is after a bit extra in exceleration on take off.
thanks for your replies.
_________________ God save Allan Moffat, God bless d**k-Johnson and thank Christ for Marcos Ambrose......... |
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| One Drone |
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I didn't feel a whole lot of difference. Go to 3.7s.
_________________ There are 10 types of people in this world. |
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| [HMASEL] |
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Also, if I can slightly hi-jack this thread.
I've got 3.45 LSD in mine at the moment, and I'm planning either 3.7 or 4.11, do they come out with 3.9? What fuel economy increase will I be looking at from 3.45 to 4.11? And how high would the revs sit at 100?, at the moment it's on what.. 2,000? 4spd 5ltr |
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| xr8ute |
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[HMASEL] wrote: I've got 3.45 LSD in mine at the moment, and I'm planning either 3.7 or 4.11, do they come out with 3.9?
Yep, I've got 3.9's and im pretty sure we have the same diff....BTR 78. 3.9's will be either 3.89:1 (2nd hand from Nissans), or 3.91 (brand new). |
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| cjh |
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[HMASEL] wrote: Also, if I can slightly hi-jack this thread.
I've got 3.45 LSD in mine at the moment, and I'm planning either 3.7 or 4.11, do they come out with 3.9? What fuel economy increase will I be looking at from 3.45 to 4.11? And how high would the revs sit at 100?, at the moment it's on what.. 2,000? 4spd 5ltr Here's how to work out speed verses diff ratio.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| vibr8n |
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economy through higher range gears... lol
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| [HMASEL] |
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vibr8n wrote: economy through higher range gears... lol
Technically, if you've got 4:11's instead of 2.9's and you're driving start stop 40k traffic and nothing but - in theory, maybe, somehow, kinda, you'll save fuel. you won't need the revs to get the car moving, and won't need to be on the gas as much because it won't bog down any. Kinda? |
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| [HMASEL] |
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cjh wrote: [HMASEL] wrote: Also, if I can slightly hi-jack this thread. I've got 3.45 LSD in mine at the moment, and I'm planning either 3.7 or 4.11, do they come out with 3.9? What fuel economy increase will I be looking at from 3.45 to 4.11? And how high would the revs sit at 100?, at the moment it's on what.. 2,000? 4spd 5ltr Here's how to work out speed verses diff ratio. yeah, maths and I don't get along much anymore, not since I thought I won lotto 
Bastard maths. So, if my EL 5ltr revs at 2000 at 100 with 3.45:1 diff gears, what will 4:11:1 diff gears do? On 18"s if it helps. |
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| prydey |
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she'd be up around 2500rpm i'd guess. i have 3.9's and although i don't have a tacho i'm pretty sure its up around 2400rpm.
_________________ eb v8: low loud and fast. just how a v8 should be. i guess the big question is, is it fast enough... |
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| mickoxhxr8 |
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[quote="[HMASEL]"][quote="cjh"][quote="[HMASEL]"]Also, if I can slightly hi-jack this thread.
I've got 3.45 LSD in mine at the moment, and I'm planning either 3.7 or 4.11, do they come out with 3.9? What fuel economy increase will I be looking at from 3.45 to 4.11? And how high would the revs sit at 100?, at the moment it's on what.. 2,000? 4spd 5ltr[/quote] Here's how to work out speed verses diff ratio.[/quote] yeah, maths and I don't get along much anymore, not since I thought I won lotto :( Bastard maths. So, if my EL 5ltr revs at 2000 at 100 with 3.45:1 diff gears, what will 4:11:1 diff gears do? On 18"s if it helps.[/quote] Dunno bout 18s but 16s, prydey pretty spot on, when cruising at 100/110 with lockup sits nicely 2500 rpm. As for fuel I didnt notice a big difference when on highway. 4.11s are the go IMO |
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| cjh |
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[HMASEL] wrote: cjh wrote: [HMASEL] wrote: Also, if I can slightly hi-jack this thread. I've got 3.45 LSD in mine at the moment, and I'm planning either 3.7 or 4.11, do they come out with 3.9? What fuel economy increase will I be looking at from 3.45 to 4.11? And how high would the revs sit at 100?, at the moment it's on what.. 2,000? 4spd 5ltr Here's how to work out speed verses diff ratio. yeah, maths and I don't get along much anymore, not since I thought I won lotto Bastard maths. So, if my EL 5ltr revs at 2000 at 100 with 3.45:1 diff gears, what will 4:11:1 diff gears do? On 18"s if it helps. I made that as easy as possible to follow. You need to measure the outside diameter of the tyre and it must be in inches (old school). This equation is 100% accurate when measured and worked out properly. You also need to know the ratio's in the g'box too.
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