Search found 310 matches

by Peter
Wed Aug 03, 2022 6:55 pm
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

1st rule of Fight Club Openinverter.....
An increase in confidence is directly proportional to a increase in acceleration :-)
by Peter
Sun Jul 31, 2022 9:53 pm
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

Thanks Charlie. I also note you are setting throtramprpm to the max 20000, I have played with that setting to see what happens, using 4000 at the moment so might be worth graphing to see the effect. If I understand Johannes on this the ramping therefore (in my case) is only upto 4000 rpm then no ram...
by Peter
Sun Jul 31, 2022 9:15 pm
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

Hi Charlie. What method are you using to graph speed ?
by Peter
Sun Jul 31, 2022 12:44 pm
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

Are you considering the effect of slipstart too ?
by Peter
Sun Jul 31, 2022 10:39 am
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

Hi Charlie. Just looked at the battery spec, pack current peak is 450A, 150A per string.
by Peter
Sat Jul 30, 2022 4:41 pm
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

Hi Charlie. May I suggest using an older version of the software to compare against your results. Could be an interesting comparison.
by Peter
Thu Jul 28, 2022 8:17 pm
Forum: Tesla
Topic: Tuning the small drive unit with charts
Replies: 126
Views: 10139

Re: Tuning the small drive unit with charts

Hi Charlie. You could reduce throttle ramp to get off the line quicker.
You will also notice a small 'boost' when your batteries are fully charged too, I charge to 330v.
by Peter
Mon Jul 25, 2022 9:45 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Are you using brake plus pot2 setting or throttle back off regen ? I am using brake plus pot2 but have realised I must be wasting regen energy. As regen in my case is relative to motor speed as I am slowing down I need to add more brake. Increasing pot2 can adjust this but with higher motor rpm the ...
by Peter
Fri Jul 22, 2022 8:23 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Congrats on passing the MOT. Dont forget to give your friendly neighborhood petrol station a wave as you pass by :-) If you remember I also had a bad cell and no matter if I swapped the BMS module or tested the cell connections neither solved it so hope you dont have the same issue. My weird cell re...
by Peter
Tue Jul 19, 2022 8:18 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

I predict 0-60 times of 4 (ish) seconds and 100 mile range, but not both at the same time :-)
by Peter
Tue Jul 19, 2022 8:15 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

You should be scared :-) A monster is lying in wait for the powerful parameters !!
by Peter
Mon Jul 18, 2022 9:44 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Hi EV_Builder. If my memory serves me thats what udcnom can do if set.
by Peter
Mon Jul 18, 2022 9:43 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

As the Smart driveshafts use a hollow tube I turned only about 0.5mm off the Tesla shafts to make them a slide in fit ( glad I did too as the aftermarket Tesla shafts were not true to the cv joints !!). I drilled holes in the Smart tube 180 degrees apart near the end of the slide in and near the end...
by Peter
Mon Jul 18, 2022 9:22 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

With respect to battery voltage we are using the same modules and pack voltage, however you have 15 modules where I am using 10 so you will have less voltage sag, therefore better performance I would say. Whats you tyre size? Based on SDU diff ratio of 9.34 that gives 107.07 wheel revs per minute at...
by Peter
Mon Jul 18, 2022 9:12 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

I just had a playtime with Fweak, dropped it down to 100 (from my original 250) and tested in steps of +25. Very interesting to say the least, low down torque goes up dramatically but watch out for overcurrent shut down, and potential broken driveshafts ! Just to see what happens I tried Fweak at 10...
by Peter
Mon Jul 18, 2022 8:53 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Hi Charlie. Thats good. What do you mean by 'weak' ?
Increase slipstart to 60 and put slipmax back to 6, try that
by Peter
Sat Jul 16, 2022 9:46 am
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Fweak 250 Udcnom 0 Boost gets you off the line quicker, I have tested at 6500 in the past, equivalent to warp factor 9 Scottie :-) It sets the voltage at which the motor starts off at. I suggest you use the graphing functions, I was wondering if its voltage sag or due to throttle calibration at the ...
by Peter
Fri Jul 15, 2022 9:37 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Hi Charlie. Did some tests, cant repeat your issue though sorry to say. iacmax is the current limiter, that does what it says but does not shut down the drive just limits current. Your setting of 800 is not causing me any problems at full throttle from start. Your settings for acceleration in my opi...
by Peter
Fri Jul 15, 2022 8:59 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Hi Charlie. Suggest you keep Boost as it is until you get your bespoke driveshafts, raising that will get you more torque on starting so may bust those welds :-( Fweak is ok, that will give good low down torque at that setting. Throtramp is as it says, 20 is fine for a gentle start. I am sure its do...
by Peter
Fri Jul 15, 2022 8:42 pm
Forum: Tesla
Topic: Tesla SDU - Front and Rear Driveshaft Compatibility?
Replies: 22
Views: 2823

Re: Tesla SDU - Front and Rear Driveshaft Compatibility?

Fluid does spray gears but also it is pumped through the heat exchanger and then to rear motor bearing and returns via motor to diff casing from what I have seen when I stripped mine down. If this gives you a clue..... I use an external electric pump which draws fluid via a filter from the SDU drain...
by Peter
Fri Jul 15, 2022 8:28 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Hi Charlie. Excellent, nearly sorted, soon be showing mega money cars your rear end at the traffic light grand prix :-) List your parameters please, I will check against mine to see what could be limiting.
by Peter
Thu Jul 14, 2022 8:05 pm
Forum: Tesla
Topic: Tesla SDU - Front and Rear Driveshaft Compatibility?
Replies: 22
Views: 2823

Re: Tesla SDU - Front and Rear Driveshaft Compatibility?

You could fit a pipe to the filler port on the SDU and route that to a convenient place so filling is easier ? That would also allow you to put fluid in to a point above the filler port if SDU orientation is not as per Tesla.
by Peter
Thu Jul 14, 2022 1:39 pm
Forum: Projects
Topic: [DRIVING] VX220 with Tesla SDU
Replies: 141
Views: 18586

Re: VX220 with Tesla SDU

Considering when buying a secondhand OEM Tesla driveshaft (£200 - £250), then chopping and home brew welding etc against the price around £250 from Berrisford looks excellent and gives peace of mind.
by Peter
Wed Jul 06, 2022 12:41 pm
Forum: Tesla
Topic: Tesla SDU - Front and Rear Driveshaft Compatibility?
Replies: 22
Views: 2823

Re: Tesla SDU - Front and Rear Driveshaft Compatibility?

Hi elShankos. I run an SDU in the same manner as you are contemplating. I removed the shaft (A) and used FRONT driveshafts as the cv joint bodies are smaller than the rear from what I have learned (and spent !!) The rear type (LDU ??) cv joint fouls the casing at (A) when I tried them but please che...