[TunePlusInc]

I think 265/45 would be about 2 inches larger than stock, 27.5" vs about 25.5".

Is that really the size? They don't look that much taller.

Yep, that is the size. You can actually zoom in on one of the pictures and see it on the tire

 

[noogie]

Do you anticipate there will be factory ecu tuning solutions? Not sure how difficult these denso ecus are to crack.

 

[noogie]

We will likely be developing our own intake that will cross over onto our turbo kit. Once we have a tuning solution sorted out. We are already working with Motec, ECUTEK, and now possibly Syvecs.

once we have a Tuning solution, that’s when the actual testing of upgrades will come in. I’m fairly certain these are torque based tuned, so they target a specific torque at all times. So if you add a part that increases horsepower, you won’t actually see the full figures because ECU is going to dial back Boost in order to maintain that torque target.

So that torque target needs to be raised up in order to see the actual gains of any parts.

I think I know who you are talking about and he is running an HKS intake set up. Yes it does fit however, it is lacking the outer most mounting hole. Which isn’t really a big deal.

that sounds very similar to the bosch fk8 ecu.

 

[snowrx]

They're fitting some tires they had on hand, not necessary an optimal setup. And for some folks, flush is more important than geometry when it comes to offset. Take sizes with a grain of salt until someone can get some tire testing/temps. This just tells us some bigger wheels fit.

Like those wheels though-

 

[TunePlusInc]

Do you anticipate there will be factory ecu tuning solutions? Not sure how difficult these denso ecus are to crack.

yes, we are actually already in the process. May be a post within the next week or two with our progress.

 

[TunePlusInc]

They're fitting some tires they had on hand, not necessary an optimal setup. And for some folks, flush is more important than geometry when it comes to offset. Take sizes with a grain of salt until someone can get some tire testing/temps. This just tells us some bigger wheels fit.

Like those wheels though-

This tells us what we can fit. Putting an inch wider wheel, and a much bigger tire allows us to measure and get us the information we need for the biggest possible set up we can run or best fitment all together. We can do that with the stock wheel and tire as well obviously, but it makes it a little easier when you are ready start with something bigger.

Also, the post is very clear that this isn’t a set up chosen for the vehicle, it’s clearly only for testing and measuring.

I have an 18x10 wheel and a very low offset 18x9.5 wheel coming as well based off measurements from this setup.

 

[snowrx]

You don't happen to have any 17" wheels laying around for test fits do you? Some of us will be shopping for -1" snow wheels soon. With the low clearance, it would be interesting to see how tall a tire we could get on the car.

 

[noogie]

You don't happen to have any 17" wheels laying around for test fits do you? Some of us will be shopping for -1" snow wheels soon. With the low clearance, it would be interesting to see how tall a tire we could get on the car.

I thought I saw someone mount a set of 17s but the clearance was really tight. It may be model specific if you go with 17s.

 

[TunePlusInc]

You don't happen to have any 17" wheels laying around for test fits do you? Some of us will be shopping for -1" snow wheels soon. With the low clearance, it would be interesting to see how tall a tire we could get on the car.

There will be room for 17s but will depend on the wheel honestly. Just have to give it a shot and see what happens. I think most are going to work that are going to be high offset.

I am personally running 225/45R18 Blizzies on factory wheels and it's great.

I thought I saw someone mount a set of 17s but the clearance was really tight. It may be model specific if you go with 17s.

Agreed. It will definitely depend on the wheel shape/type. Not all are going to work especially with lower offsets.

 

[KanmuriDavid]

One thing I noted when I looked at my buddy's car today is that the rear quarter panel is not "prerolled" from the factory. This is going to be an issue when it is lowered.

It's a bit more complex than "just roll it" since it is not a metal panel but a plastic one, so it will need to be cut to allow for better wheel clearance for aggressive offsets. I'm sure there'll be aftermarket bolt on solutions long term as wide bodies become available.

 

[underscore]

How's the clearance at full compression and/or full lock?

 

[aandrea832]

Tune, TokyoTexan mentioned there are wheel spacers on the rear hubs, did you notice the same thing when swapping wheels?

 

[KanmuriDavid]

Tune, TokyoTexan mentioned there are wheel spacers on the rear hubs, did you notice the same thing when swapping wheels?

This has been a confirmed fact. There are indeed spacers in the rear.

 

[Tokyotexan]

We will likely be developing our own intake that will cross over onto our turbo kit. Once we have a tuning solution sorted out. We are already working with Motec, ECUTEK, and now possibly Syvecs.

once we have a Tuning solution, that’s when the actual testing of upgrades will come in. I’m fairly certain these are torque based tuned, so they target a specific torque at all times. So if you add a part that increases horsepower, you won’t actually see the full figures because ECU is going to dial back Boost in order to maintain that torque target.

So that torque target needs to be raised up in order to see the actual gains of any parts.

I think I know who you are talking about and he is running an HKS intake set up. Yes it does fit however, it is lacking the outer most mounting hole. Which isn’t really a big deal.

Why not Haltech, Link, emu masters, fuel tech, etc? I mean don't get me wrong, Motech and Syvecs are top notch standalones, but are also very expensive ($5k+). Im fairly confident that the majority of GRC owners will either not be able to afford, or don't need all the functions of either of those 2 standalones. Haltech, Link, etc. are relatively half the price of those 2 while at the same time providing more than enough tuning capabilities for 99% of the GRC owners out there.

 

[Mizzeldrizzel]

Cool to see how much room there is with stock suspension. I’ll be curious if do you end up deciding on +30 offset wise for the 18x9.5 as that’s prob what I’ll end up going with

 

[samagon]

I'm certain I'm in the minority, but I'm very interested in what 17" wheels will fit without some crazy offset to clear the brake calipers.

Houston roads suck, and a bit more sidewall would be nice.

 

[noogie]

If you're looking for a set of Toyota wheels to run for winter, the Highlander factory wheels may be the most similar to the GR Corolla's size. The benefit of running Toyota wheels is so you don't have to use aftermarket lug nuts, and they can be purchased relatively cheap in the used market.

This fitment is speculation, but the numbers seem to show that it should be compatible.

GRC factory wheels:
18x8.5
30mm offset
5x114
235/40/18

14-19 Highlander wheels:
18x7.5
30mm offset
5x114
225/45/18

ALY75162U Toyota Highlander Wheel/Rim Machined #426110E260

 

[noogie]

RX350 wheel is another option:

ALY74336 Lexus RX350, RX450h Wheel/Rim Silver Painted #426110E240

 

[Hawt.Hatch]

I am using stock wheels for the winter. Selling the Michelins and using my own aftermarket wheel with sticky tires in the summer.

 

[Vanisshen]

Shouldn't offset change when the wheel width changes? According to tiresize.com, going from 8.5" with 30mm to 7.5" would require 43mm offset for the same backspacing.