| [ Total Views: 701 | Total Replies: 13 | Thread Id: 102424 ] |
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 tweety
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| posted on June 14th, 2013 at 07:55 PM |
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Type 3 auto final drive ratio
Done many searches but no find. Is there any final drive ratio change possible from standard?
Looking for any possibility of a taller set up 10% taller or even 15%. Have previously fitted taller typres from 295/50R15 to 275/60R15 but am
looking now at the diff.
Thanks
http://www.youtube.com/watch?v=HXwh4z8d66o
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mackaymanx
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| posted on June 14th, 2013 at 08:17 PM |
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The only other ratio is from the 411/412 which is shorter so not what you wanted.
Quote of the week
"Do I wish to send them to you again, nope, no interest can't be bothered really, to much hassle for little or no return."
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mackaymanx
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| posted on June 14th, 2013 at 08:22 PM |
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Type 3 - 3.67
Type 4 sedan 3.73
Type 4 wagon 3.91
Quote of the week
"Do I wish to send them to you again, nope, no interest can't be bothered really, to much hassle for little or no return."
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tweety
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| posted on June 14th, 2013 at 08:47 PM |
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thanks Mackaymanx thought so. and the Subaru auto boxes are 140mm too long. oh well. bigger tyres is best I can do. lowers revs by 150rpm at 100kph
down to 3100rpm.
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ian.mezz
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| posted on June 15th, 2013 at 12:40 PM |
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a 4 cylinder car needs to be at around 3000 so that it will pull up hills and your not changing back all the time.
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tweety
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| posted on June 15th, 2013 at 09:13 PM |
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The trikes ea81/SC12 draw thru will be getting sPFI shortly and the SC taken off. If that is enough powerI'll be happy. If it isnt I will install a
supercharger again in a blow thru set up with on/off switch. Then taller gearing would be ideal.
Think then 16 inch wheels (up from 15) might be on the cards and raise the guards.
Thanks
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tweety
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| posted on June 15th, 2013 at 10:00 PM |
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Didnt realise that tyres are available in a size 275/65/r15. at ebay site
http://www.ebay.com.au/itm/Brand-New-265-70R15-275-65R15-255-70R15-High-Quali...
This will change the tyre circumference 8.5% eg adds 8.5 kph to 100kph at the same revs. Means at an actual 100kph you drop about 240 rpm down from
3100 to say 2860.
As you say Ian you need the power to keep you from slowing on the hills and when towing with tall a gear you will need to change up earlier. But if
the Sc is installed this woldnt happen.
Just as a matter of interest....when new the trike had a 1916cc engine that, upon climbing a small mountain near us would slow to 60kph in 2nd gear
(auto). After the EA81 NA engien was fitted it would get down to 80kph in second gear. When the SC12 draw thru was fitted it would romp up that
mountain at 105 kph in top!! with all the low down power anf torque you wanted. Dyno showed 30% power and 33% torque increases. So taller gearing
then should be quite ok IMO.
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pete wood
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| posted on June 17th, 2013 at 06:43 PM |
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Why are you removing the SC?
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tweety
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| posted on June 17th, 2013 at 07:22 PM |
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purely economy Pete.
Light foot or heavy foot it achieves 19 mpg 14L/100kms and worse with towing. Not good for a 550 kgm vehicle. Of course the cruising range has
dropped to 300kms from 500kms. On a long tour it means carrying fuel. It just drinks it. This is regardless of a dyno tune and even after that I put
in smaller jets to try and lower the consumption. That helped a little but not enough.
So SPFI will not replace the 100+hp I get now but it might be in the middle of that and the weber NA engine. Say 90hp, the same as the ea82 with sPFI
that came out in the USA. I'd be happy with that. However the clutched SC12 blow thru might be considered if more power is needed- hopefully
not.
The dyno was itneresting. That VW auto zaps 14hp off the engine. Much more than I anticipated when I first went ea81.
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urban_myth
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| posted on June 18th, 2013 at 08:25 AM |
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have you checked the stall rate in the convertor?I think standard tye3 convertor with vw1600 is 2100 rpm where a convertor for a kombi which is
exactly the same is about 2500rpm.I had one made with a lockup plate in which locked the convertor up at about 80kmh.this did widen the convertor so
required a spacer plate between the motor and box.we where looking at about 300rpm drop when the plate locked.we where running a v6 motor behind this
box and changed the stall to 1600rpm.geoff
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tweety
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| posted on June 18th, 2013 at 07:14 PM |
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thanks Geoff. most interesting.
I dont suppose you got pics of that lock up plate? Tony
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vlad01
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| posted on June 18th, 2013 at 08:24 PM |
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| Quote: | Originally
posted by urban_myth
have you checked the stall rate in the convertor?I think standard tye3 convertor with vw1600 is 2100 rpm where a convertor for a kombi which is
exactly the same is about 2500rpm.I had one made with a lockup plate in which locked the convertor up at about 80kmh.this did widen the convertor so
required a spacer plate between the motor and box.we where looking at about 300rpm drop when the plate locked.we where running a v6 motor behind this
box and changed the stall to 1600rpm.geoff
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Is that the green V6 kombi on youtube?
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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urban_myth
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| posted on June 19th, 2013 at 08:33 AM |
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my van is not green.mine has been off thr road for 3yrs now.has been changed to full drag with full cage,supercharged motor and an alloy front
beam.Idont have any photos off the convertor.the plate fitted was from a kc ford laser which is centrifical in action.in checking the ea81 manual the
stall rate for this motor was between 1800 and 2100 rpm.maybe lowering the stall will help.sometimes,if the convertors are different sizes,oil
capacity is different and this can have the same effect as changing the stall rate.Im no mechanic but having done many different conversions using the
vw auto the convertor is critical to the performance
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tweety
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| posted on June 19th, 2013 at 12:54 PM |
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Good points. thanks again.
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