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 72type3wrx
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| posted on February 5th, 2008 at 11:32 AM |
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Quick guys i need feedback ASAP so i can purchase the gears
Ok guys
I'm getting a 4.57 albins Ring and Pinion, changing my gears to:
3
2
1.3
0.82
shift speeds are:
64
95.4
147
233
4th gear 3010 rpm at 100 kph
12.256 1/4 mile ET
178.0 1/4 mile - kph
4 1/4, gear @ end
5357 1/4, rpm @ end
Quick guys i need feedback ASAP so i can purchase the gears.
only problems i can see are that in a 40kph school zone i will be in 2nd gear @ 3000rpm (3rd gear @ 1909rpm)
and 110kph will be 3311rpm
1972 Type 3 Fast back, RS Turbo 2ltr, VF34/P20,
3" Exhaust, WAIC, Wolf 3D, Sard 540cc's, Swirl pot and VL Fuel pump, Apexi CAI, Custom VW 4spd with straight cut albins 3.87 R&P, stock brakes
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56astro
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| posted on February 5th, 2008 at 11:46 AM |
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With those ratios, each gear selected will be at a lower RPM.
1st - 2nd = 4666
2nd - 3rd = 4550
3rd - 4th = 4415
Ideally, you want to grab each new gear at higher RPMs.
Have you seen Albins' web site?
http://www.albinsgear.com.au/
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa |
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72type3wrx
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| posted on February 5th, 2008 at 12:00 PM |
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changing at 7000rpm i calculated:
1st - 2nd = 4715rpm
2nd - 3rd = 4563rpm
3rd - 4th = 4412rpm
changing at 7500rpm i calculated:
1st - 2nd = 5000rpm
2nd - 3rd = 4879rpm
3rd - 4th = 4725rpm
what i am trying to keep is good driveability around town and not loose anything at the strip. and maintain a 3000rpm highway speed.
what ratios would you guys be goin for?
1972 Type 3 Fast back, RS Turbo 2ltr, VF34/P20,
3" Exhaust, WAIC, Wolf 3D, Sard 540cc's, Swirl pot and VL Fuel pump, Apexi CAI, Custom VW 4spd with straight cut albins 3.87 R&P, stock brakes
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56astro
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| posted on February 5th, 2008 at 12:26 PM |
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Assuming 215/60/15 rear tyres
3.0 1st
1.76 2nd (shifting @ 7000 = 4106rpm)
1.09 3rd (shifting @ 7000 = 4335rpm)
0.82 4th (shifting @ 7000 = 5266rpm)
Slightly bigger spread between 1st - 2nd, and 2nd - 3rd (closer to the spread of the stock ratios).
With that R&P and 4th ratio, your gearing is close to stock L-bug 4th gearing. Is that what you want with a water-cooled, turbo motor?
Depend on what you're after, track ratios will be a compromise on the street and vice versa.
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa
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72type3wrx
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| posted on February 5th, 2008 at 01:10 PM |
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cool i like the way the revs are higher at the next gear but i think the 1/4 times will be the same? correct?
and the biggest problem is the only gears albins have in stock are:
1st/2nd sets I have on the shelf at the moment are –
2.75 X 1.93
3.00 X 2.00
2.15 X 1.76
3.33 X 2.08
3.10 X 2.08
3.55 X 2.25
2.82 X 1.86
3rd – 1.78, 1.84, 1.72, 1.65, 1.59, 1.50, 1.44, 1.40, 1.35, 1.30, 1.25, 1.19, 1.14
4th – 1.50, 1.44, 1.40, 1.35, 1.30, 1.25, 1.19, 1.14, 1.09, 0.96, 0.85
1972 Type 3 Fast back, RS Turbo 2ltr, VF34/P20,
3" Exhaust, WAIC, Wolf 3D, Sard 540cc's, Swirl pot and VL Fuel pump, Apexi CAI, Custom VW 4spd with straight cut albins 3.87 R&P, stock brakes
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56astro
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| posted on February 5th, 2008 at 01:19 PM |
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Let me run through some calcs and I can compare some of the ratios.
Send me a PM with your e-mail and I can send you the graphs.
Dangerous is very good with drag racing ratios - hopefully he will chime in.
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa
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Craig Torrens
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| posted on February 5th, 2008 at 02:15 PM |
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weak diff ratio ?
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72type3wrx
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| posted on February 5th, 2008 at 02:23 PM |
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its the only one they have
1972 Type 3 Fast back, RS Turbo 2ltr, VF34/P20,
3" Exhaust, WAIC, Wolf 3D, Sard 540cc's, Swirl pot and VL Fuel pump, Apexi CAI, Custom VW 4spd with straight cut albins 3.87 R&P, stock brakes
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56astro
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| posted on February 5th, 2008 at 02:46 PM |
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If they are the only gear sets, then your original combo is about as good as you will get with that diff.
I think that in most situations, the higher the diff ratio, the weaker the parts are.
I think you'll find a beetle 3.875 or 3.44 (used by Wayne Penrose I think) would be a better drag racing diff.
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa
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72type3wrx
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| posted on February 6th, 2008 at 08:44 AM |
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I am waiting for weddle to get back to me for a list of there available gears.
Having the gears rise higher in the next gear is this any real benefit?
Obviously no matter the ratios Albins gears are super strong, I've only heard one or two stories of them braking and that was under tremendous load
and on a track.
1972 Type 3 Fast back, RS Turbo 2ltr, VF34/P20,
3" Exhaust, WAIC, Wolf 3D, Sard 540cc's, Swirl pot and VL Fuel pump, Apexi CAI, Custom VW 4spd with straight cut albins 3.87 R&P, stock brakes
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JVLRacing
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| posted on February 6th, 2008 at 09:06 AM |
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if circuit yes! 3.55 1st and 4th 1.00
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72type3wrx
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| posted on February 6th, 2008 at 10:04 AM |
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| Quote: |
if circuit yes! 3.55 1st and 4th 1.00
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is that because take off speed isn't as important on a circuit? also a 1.0 4th will have my engine crying on a highway cruise.
I'm after street ratios, IE cruising around town, racing falcodores at lights and the occasional trip to the strip.
1972 Type 3 Fast back, RS Turbo 2ltr, VF34/P20,
3" Exhaust, WAIC, Wolf 3D, Sard 540cc's, Swirl pot and VL Fuel pump, Apexi CAI, Custom VW 4spd with straight cut albins 3.87 R&P, stock brakes
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JVLRacing
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| posted on February 6th, 2008 at 10:23 AM |
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| Quote: | Originally
posted by 72type3wrx
| Quote: |
if circuit yes! 3.55 1st and 4th 1.00
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is that because take off speed isn't as important on a circuit? also a 1.0 4th will have my engine crying on a highway cruise.
I'm after street ratios, IE cruising around town, racing falcodores at lights and the occasional trip to the strip.
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Its all about getting power to the ground and helps with circuit. I found 3.55 was spot for 1st gear.. Depending on your torqre figs
thats where you need to find out before decidin wat ratio you need.
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56astro
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| posted on February 6th, 2008 at 03:48 PM |
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Here are the graphs so far.
The first one is your suggested ratios. You can see that each new gear is grabbed at a slightly lower rpm.
They are relatively evenly spaced. The dashed lines you can see are std L-Bug ratios. You can notice that you 2nd and 3rd gear ratios are much shorter
than the beetle ratios. Not much chop for a water-cooled turbo bug for street driving.
Notice that with that 0.82 4th and that 4.57 R&P, that your rpms at highway speeds are nearly 3200. Could you live with that? Or are you better
off getting a taller R&P?
VW car, VW engine ...... keepin it "real"
35MPG on 101.3kPa
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56astro
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| posted on February 6th, 2008 at 04:16 PM |
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In this graph the ratios are
3.33
2.08
1.3
0.82
3.875 R&P
1st 2nd and 3rd are taller than the beetle, but closer together. 4th is taller, about 2500 @ 100km/h, about 3000 @ 120km/h.
How this would go on the track - ??
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35MPG on 101.3kPa
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Baja Wes
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| posted on February 6th, 2008 at 07:54 PM |
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If you put all your car info into this program, it will make the gear ratio graphs, it will show the effects of changing the ratio's on acceleration
and 1/4 mile times.
http://www.offroadvw.net/exceldyno/
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56astro
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| posted on February 6th, 2008 at 07:58 PM |
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He's been using that Wes
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Baja Wes
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| posted on February 7th, 2008 at 09:25 PM |
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yeah, I couldn't tell. I wasn't sure what the question is 
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