robertmccall
Posts: 9
Joined: Tue Mar 10, 2020 8:41 am

Performance Mods? i3 M anyone?

Tue Mar 10, 2020 8:50 am

I’m a new 2017 i3 BEV owner and I’d like to start doing some mods. Has anyone been able to figure out how to figure out any way to increase performance? Anyone coding this far yet? I’d like to put on some wide 18” tires but I’ve read you need a crazy offset. Does anyone know the specs needed for a 18x8-9.5 with a tire setup? Just looking for something more sticky and wouldn’t mind getting coils with a stiff spring rate. Thinking a time attack build would be interesting with an i8 swap but want to see push the stock internals potential first before I swap out. Thanks i3 owners.

skeptic
Posts: 63
Joined: Thu Oct 10, 2019 7:31 pm

Re: Performance Mods? i3 M anyone?

Tue Mar 10, 2020 10:49 am

I sometimes wonder what next generation of performance modding will be like. Will it be something like an inline amp and bigger motor (hiding as much as possible from the stock computer)? Computer coding that pushes stock motors harder (I assume there is some level of safety margin just like ICE)? Some combination of the two? Maybe even complete motor/battery/ecu swaps?

Your question isn't new, especially the part regarding tire/wheel swaps, but I haven't seen much in the way of a good answer. I know some have put s wheels on, with appropriate fender mods to go with it, but that's pretty much the opposite of going to a wide 18" wheel. If you find a good solution I'm sure there will be a lot of people wanting to know exactly what you did, specs and all.

Speaking of the i3s, I believe I read that the s has the same electric motor as the standard models, same part number and all. No clue what it would take to get "s" power out of an i3. Recoding? Completely new computer? Other electronics from the s?

JohnWasser
Posts: 49
Joined: Sat Mar 07, 2020 6:15 pm

Re: Performance Mods? i3 M anyone?

Tue Mar 10, 2020 6:59 pm

It looks like Speedway Motors has 18" and 17" wheels that are 8" wide and that they think will fit on a 2017 i3.

https://www.speedwaymotors.com/shop/201 ... ter:224028

robertmccall
Posts: 9
Joined: Tue Mar 10, 2020 8:41 am

Re: Performance Mods? i3 M anyone?

Wed Mar 25, 2020 3:20 pm

I saw someone on reddit with 18” wheels but would like to know if it’s possible to drive the car without codes firing because of the 3% margin. Anyway around this to fit a wider 18” instead of doing wheel spacers on OEM wheels?

JohnWasser
Posts: 49
Joined: Sat Mar 07, 2020 6:15 pm

Re: Performance Mods? i3 M anyone?

Thu Mar 26, 2020 1:58 pm

robertmccall wrote:
Wed Mar 25, 2020 3:20 pm
I saw someone on reddit with 18” wheels but would like to know if it’s possible to drive the car without codes firing because of the 3% margin. Anyway around this to fit a wider 18” instead of doing wheel spacers on OEM wheels?
The factory tires are all about 696mm (+/- 4mm) in diameter after you add the sidewall height to the wheel diameter::
155/70R19 = 699.6 diameter
175/60R19 = 692.6
155/60R20 = 694
175/55R20 = 700.5

On an 18" wheel, some of the tires of that diameter would be:
150/80, 160/75, 170/70, 185/65, 200/60, 215/55

I think you want the wheel width to be about the same as the tread width.

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