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Post by kiwiev on Feb 2, 2015 9:38:47 GMT
Another update just got back from holiday.
Finally got bmw diff gears 5.44 to 1 ratio ex Austria
So waiting on diff to be rebuilt limited slip
So cant wait to get back in car should be quick up to 150 kph
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Post by kiwiev on Feb 7, 2015 8:38:47 GMT
i finally put up YouTube video of first run with 4.44:1 ratio Diff enjoy
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Post by Stiggy on Feb 7, 2015 22:43:17 GMT
Wow, that looks very impressive, lucky it seized at slow speed and not one minute b4. Did the motor get too hot and lock up? Have you discovered the cause?
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Post by kiwiev on Feb 8, 2015 10:21:24 GMT
Hi Stuart
yes I was very luck.
Cause was Diff low oil and hand brake on and to much torque about 850 ft/lb at the wheels. It was just one from the wreckers to try out 4.44:1 ratio.
I think it was a old Diff it seized the pinon gear.
But good news I am getting a E-30 LSD Diff with 5.44:1 ratio so being direct drive this should hit the sweet spot of the electric motor 5000 rpm at 60 mph at 165hp.
In hind sight i should have put a gearbox in but I wanted to keep it simple.
Should get recon Diff in 2 weeks and will post up results.
The really cool thing is the regenerated braking its on a pressure sensor in brake line so I can really dial in how much braking I want in video it was about 35% (280 amps back to battery) The two controllers can handle 1000 amps.
Cheers Conrad
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Post by Stiggy on Feb 8, 2015 20:40:15 GMT
Glad it wasn't the motor. Your regen is a great figure. I prefer a direct connection to drive the diff rather than a trans
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Post by mawdo81 on Feb 8, 2015 21:00:20 GMT
Why? What's the pros and cons please?
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Post by kiwiev on Feb 9, 2015 8:58:56 GMT
Hi with a AC motor reverse is a matter of telling the controller no big relay contractors need.
so direct drive eliminates the need for a gearbox weight engineering etc
yes you have to play with diff ratios and it limits your top speed, but I really don't want to go much faster than 150kph.
And it accelerates quicker
goal is to do some hill climbs against a few petrol cars.
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Post by mawdo81 on Feb 9, 2015 14:13:05 GMT
Ha,
Just re-read I thought Stuart was saying he prefers a Direct Drive to a Diff Drive and was wondering what that meant! I understand now that you mean driving the diff directly rather than through a box.
Sorry for any confusion.
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Post by kiwiev on Mar 2, 2015 9:53:47 GMT
Finally the new rebuilt $3900.00 BMW motorsport 5.44:1 LSD Differential turned up. And the fun begins slightly larger than the old one. |
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Post by kiwiev on Mar 2, 2015 10:21:59 GMT
 still having trouble with photo bucket cant post pics here anyway had to modify diff mounts hope to finish tomorrow and see what the lower ratio does.  |
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Post by The Management on Mar 2, 2015 10:39:37 GMT
still having trouble with photo bucket cant post pics here anyway had to modify diff mounts hope to finish tomorrow and see what the lower ratio does. Just checked your post, need to use the 'Direct Link' with 'Insert Image' button follow forum guidance ( link)  Hope that helps the Management |
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Post by kiwiev on Mar 3, 2015 20:22:37 GMT
Thanks Management try again  |
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Post by kiwiev on Mar 3, 2015 20:24:38 GMT
So I had to move Diff back 20 mm. Got car going and WOW WOW I have a 30 metre long garage and smoked both tires the whole way.  |
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Post by kiwiev on Mar 3, 2015 20:26:22 GMT
SO if all goes well I'm going to enter a local hill climb about 1 km time trail , then start putting body on.  |
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Post by kiwiev on Mar 4, 2015 5:22:22 GMT
here is a wee video of new diff
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