Re: Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sun Jul 16, 2023 8:58 am
by Ev8
I have no idea, it is possible the book value of 1550kg is wrong, either way I’m happy with the distribution
Re: Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sun Jul 16, 2023 8:59 am
by Ev8
Ok so I’ve seen listed weights of 1350kg elsewhere now but the mot brake test weight on the system was 1550kg
Re: Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sun Jul 16, 2023 9:01 am
by Pete9008
Either way still an impressive achievement
How's it running with the extra volts?
Re: Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sun Jul 16, 2023 9:16 am
by Ev8
Yeah it’s running well thanks, at high SOC I peak about 125kw from the battery pack, so not a giant leap in Performance but every little helps, I sure if I was using a different inverter I’d see more as MG1 on the Prius gen2 is limited to 230amps, but I’m happy enough with how things are not to start changing things just yet!
Re: Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sun Jul 16, 2023 12:19 pm
by RetroZero
That's almost 60Kw. On Mg1 ? Is that the inverter limit or the Lexus transaxle Mg1 limit?
Re: Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sun Jul 16, 2023 12:38 pm
by Ev8
Pretty sure that I’m inverter and voltage limited mg1 motor is rated around 100kw at 650v
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Wed Aug 16, 2023 7:35 pm
by Ev8
For everyone who knows what I’m like this will come as no surprise…… I’m still driving the car but since a particularly hard launch last Friday the gearbox has a new noise sounds like if you took an old worn out bearing washed the grease out of it and shook it like a rattle, goes away in 4th but I mostly use third!
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Wed Aug 16, 2023 7:36 pm
by Ev8
Lol anyone in the uk got a spare 5speed RX8 box?
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Thu Aug 17, 2023 10:51 am
by rstevens81
isnt the nc/mk3/3.5 mx5 gearbox very similar? (if not identical?) as mazdas do rust for a past time (dont ask me i how i know)
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Thu Aug 17, 2023 5:54 pm
by Ev8
Somebody need to either talk me into or out of this crazy idea I’m having……
Transverse mount an rx400h transaxle to drive the rear,
Make some custom uprights for the front to take late mx5 rear wheel bearings, front mount the rx400h mgr to drive the front wheels,
Call it the ev8 mk3
I have all the parts here to do it……
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Thu Aug 17, 2023 6:01 pm
by rstevens81
If your looking for someone to talk you out of it...you might only get tumbleweed ... Why do you think finished is not appropriate label and we have to stick with [driving]...my view is have ago worst that happens if it doesn't work you go back to what you have and buy a gearbox...I would be tempted to buy a few hundred quid banger and borrow some bateries from the rx8 for a while (always been tempted with a MK1 for ka for an electric go cart for driving round town)
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Thu Aug 17, 2023 6:10 pm
by Ev8
Lol I thought someone out there might tell me the logical thing to do is refine and develop what I’ve already got!
I know it’ll never be finished!
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Thu Aug 17, 2023 6:36 pm
by Alibro
Ev8 wrote: ↑Thu Aug 17, 2023 5:54 pm
Somebody need to either talk me into or out of this crazy idea I’m having……
Transverse mount an rx400h transaxle to drive the rear,
Make some custom uprights for the front to take late mx5 rear wheel bearings, front mount the rx400h mgr to drive the front wheels,
Call it the ev8 mk3
I have all the parts here to do it……
The only crazy idea here is thinking anyone would try to talk you out of it.
No chance!
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Fri Aug 18, 2023 6:28 am
by Ev8
Ok I’m off to look for a rear subframe to mock stuff up
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Fri Aug 18, 2023 8:43 am
by Jacobsmess
Ev8 wrote: ↑Fri Aug 18, 2023 6:28 am
Ok I’m off to look for a rear subframe to mock stuff up
I've been thinking about a similar thing (in the rear only) for my van.
The reason against is that you end up with a "radically altered vehicle" according to the DVLA system and a Q plate which might affect resale if that ever was required....
Otherwise I think for me it's definitely the best option, most efficient in terms of power and weight and frees up a lot of space for batteries.
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Fri Aug 18, 2023 9:20 am
by rstevens81
Definitely a grey area, but as the rear sub frame is a bolt on item to the original car (chassis) fabricating a subframe or may or may not count as modification to the chassis, if it were an ice car a custom rear subframe probably wouldn't get a q plate...but to be honest I wouldn't worry about resale of car as most of our project cars were 1 away from scrap before we added the motors.
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Fri Aug 18, 2023 11:48 am
by Jacobsmess
rstevens81 wrote: ↑Fri Aug 18, 2023 9:20 am
Definitely a grey area, but as the rear sub frame is a bolt on item to the original car (chassis) fabricating a subframe or may or may not count as modification to the chassis, if it were an ice car a custom rear subframe probably wouldn't get a q plate...but to be honest I wouldn't worry about resale of car as most of our project cars were 1 away from scrap before we added the motors.
No you're right, mine probably should have gone to the scrapyard tbh!
The points system is based on the chassis or monocoque (5 points) engine (1 point), transmission (1 point), axles (2 points) and suspension (2 points)...
More annoyingly, you end up requiring an inspection, at which point I'd be more worried about condemning my vehicle due to my messy welding....
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sat Aug 19, 2023 7:20 am
by Ev8
On a side note I featured in this video
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sat Oct 28, 2023 2:58 pm
by Ev8
Long time without updates, changed job and I’m in the process of moving house! I have however managed to build a new display, after killing one of my little nextions I have been driving with just the fuel gauge for a Soc indicator, I like a little more info than that, so after finding a rare rx8 satnav module I modified it to house a 7” android tablet and added a wemos d1 on the serial output from the teensy, borrowed some code I found on Jamie’s GitHub, thanks Jamie!
[media] [/media]
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sat Oct 28, 2023 5:36 pm
by Bigpie
Code thief. Glad it helped. That flip up screen is awesome
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sat Oct 28, 2023 5:59 pm
by Ev8
Lol, most of my code usually is hacked together from bits stolen from here and there!
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Wed Jan 31, 2024 7:17 am
by Ev8
Nothing much in the way of updates, I’ve bought a house so that requires most of me free time, probably a solar panel project coming this summer! I have however acquired an rx450h inverter at a price to good to pass up, I’m hoping to gen it running via serial as over have done for the gs450 and Prius gen3, if I can it could potentially give me a good amount of extra power. I need to get reading on how people worked out the serial messages on the other Toyota stuff!
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sat Mar 09, 2024 1:37 pm
by Ev8
Finally found a weekend to pull out and replace the diff that’s been complaining louder and louder over the last 3000 miles, new wheel bearings too while I’m at it
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Sat Mar 09, 2024 5:54 pm
by Ev8
So good news bad news…..
Good news is I can no longer hear how many teeth the diff crown wheel has under regen.
Bad news is the diff can’t have been the only thing making a noise so I suspect the gearbox isn’t the healthiest.
So that leads to the question find another gearbox or ditch the whole motor setup and go gs450?
Re: [DRIVING] Project RX8 , Prius gen2, Lexus transaxle to rwd
Posted: Thu Jul 04, 2024 6:30 am
by steveknox
I'd go gs450. That's what I've done in my rx8. It fits nicely in the tunnel, although mounting the rear without the PPF can be a pain.