Changing The Brake

[joachim_tang]

Does anyone know how the process of the braking system work ??? Is the brake not the same as the normal car ??? If I want to change to AP Racing brakes, will it affect the brake system by not recharging the Battery once I changed the brake from original ???

Thanks :)

Joachim

[200h]

the braking system is different to a normal car as it has to operate even when the engine isn't running

this is why when you get in your car you can hear a pump turning on and this is pressurising the braking system

so its ready for use.

to work on the brakes make sure you keep your key well away from the car pul the abs relays to be on the safe side

once all your work is done replace the relays then using the toyota techstream software and diagnostic cable

on a laptop you can then bleed the brakes by activating the abs pump.

techstream software & cable on eBay is about £25

[rayaans]

changing the brake discs wont have an impact on the regeneration system.

[ganzoom]

Does anyone know how the process of the braking system work ??? Is the brake not the same as the normal car ??? If I want to change to AP Racing brakes, will it affect the brake system by not recharging the battery once I changed the brake from original ???

Thanks :)

Joachim

The mechanical brake is the same as any other car....Why are you wanting to change to an AP racing big brake kit??

The IS hasn't got enough power to warrant a BBK, not unless your going to track one, in which case you've bought the wrong car....

I also persume you know AP kits cost about £5k per axel before fitted, and replacement discs/pads are significantly more expensive than normal systems. Your probably have to also ensure they fit under the OEM wheels.

[joachim_tang]

Actually I just wonder about it as my friend driving his own is300h and changed to AP racing full brake kit....

For me I prefer using the original and genuine Lexus parts rather than changing to other big brake which is useless to the is300h

Joachim

[200h]

your mate must have more money than sense,most of the time when braking you are using regenerative braking

so your calipers / pads aren't being used it is only when heavier braking is needed or at very low speeds around town when

the pads are actually meet the discs

[ganzoom]

Actually I just wonder about it as my friend driving his own is300h and changed to AP racing full brake kit....

For me I prefer using the original and genuine Lexus parts rather than changing to other big brake which is useless to the is300h

Joachim

If your fiend drive off a cliff would you follow them?? Putting a BBK on a IS300H is probably the most pointless waste of time/money mid I've ever heard of, if they have money to burn good for them, people also buy Bentleys and paint them gold.

Mod a car for what you want it to do, not for the sake following others. The IS300H isn't a track day car, so upgrading the brakes is as good as burning money. What would be an interesting mod would be swapping out the heavy nikle hydrid Battery for a lithium ion pack....

[joachim_tang]

Ganzoom I agree with you :) I will never do any modifications that is pointless but how about the exterior looking mod ? Like adding a rear spoiler ???

Joachim

[capese21]

Ganzoom I agree with you :) I will never do any modifications that is pointless but how about the exterior looking mod ? Like adding a rear spoiler ???

Joachim

If you want to mod your car and you enjoy it then do it!! Ask the opinion of others on here but ultimately make your own mind up. I added a spoiler to my Fsport because I like how it looks. It is purely cosmetic and I have no desire to make a track day car. Many mods to cars are cosmetic and there is nothing wrong with that.

Enjoy your car

Ed

[ganzoom]

Everyone wants different things, the reason we had no interest in the 'F-sport' IS over the normal IS is because underneath its the same car. But lots of other people like to the more aggressive looks of the F-sport.

Spolier/lights etc aren't really that expensive or difficult mods, you can reverse them quite easily, I don't even class them as mods. But when you start talking about dropping a few Ks on things like BBKs, than either money is no object, or you haven't thought out what your trying to achieve.

On my last car, I spent £2K on a quaife LSD, probably the best £2K I've spent on any mod. Than a similar amount on Bilstein dampers - which again worth every £ I paid. But wasted plenty of £££, like solid rear subframe bushes, about £1K on after-market oil coolers, £500+ on air-intakes, and close to £1k on various ECU remap options. Had I not sold that car I'm pretty sure I would have dropped £3-4K on hybrid turbos by now.

I have no problems spending £££ on mechanical changes that make a difference, but a BBK on the IS300H, 100% pointless.

If you really want to mod the IS300H, I would look into either the IS200t or thinking about doing a whole engine transplant from a scrapped IS350 - which they only sell in the states. But properly modding the IS is gong to be pretty difficult due to the lack of any third party info on ECU reprogramming. I still think replacing the Battery pack with a lithium-ion solution is a worth while mod, but your going have to build a bespoke lithium-ion pack. You have to keep the overall weight/size the same, otherwise your looking at re-adjusting the whole suspension setup. Building the pack is possible - and not that hard, what's hard is how your going to convince the ECU to charge the thing, and working out what rate of re-charge/discharge the new pack can handle compared to the old.

That's proper modding, and once our IS300H comes out of warranty a option I'll seriously have a think about :)....

[joachim_tang]

Does anyone on web had mod with changing the Battery to lithium ion ???

Joachim

[capese21]

Does anyone on web had mod with changing the battery to lithium ion ???

Joachim

Very unlikely I would have thought. Why would anyone even contemplate it?

Ed

[ganzoom]

^^ Becuse per kg, Lithium ion batteries offer 20-50% more charge per unit weight compared to NiHM. So instead the car will stay in EV mode for longer, or you can just shed weight. Maybe even reprogram the ECU to allow the electric motor to run at a higher output.

Toyota is finally offering the latest Prius with an lithium ion pack.

You can take apart the current NiHM pack in the IS and replace the content with equivalent Lithium Ion cells. The problem is how you control charge/discharge as the thermal properties of the cells will be very different.

As I've said, that's proper car modding :)

[ganzoom]

These people are probably the ones to contact. They have build a fully electric RX8 and have lots of knowledge on Leaf batteries.

I bet they'll have a go at turning the IS300H into a proper EV - For a price :)

http://www.indra.co.uk/index.php/services/modifications-to-oem-vehicles

[ganzoom]

Here you go, the guys in the US has done it on the Prius (Which is essentially the same as the IS300H drivetrain expect for a larger ICE unit).

If you got £5-10K to burn on an AP racing BBK, I suggest this might be a more interesting mod - You might become the first person to convert an IS300H to a plugin EV :)

http://www.enginer.us/products/conversion_kit.php

[ruralrat]

reading about mods to the is300h on here is interesting, i am no boy racer(i'm 57 for gods sake!! 🙂 ) but i do like to individualise my cars, it is a personal thing i guess, i have recently put 19 inch wheels on my f sport and they fill the arches much better, the car was bought with a carbon body kit on , complete with twin chrome pipes,i'm not a fan of carbon fibre to be honest, but it does enhance the look, i will change the rotors for drilled and grooved ones as i think these look much nicer, plus i will paint the calipers , aside from this,  i don't think you can do much more to these cars without compromising the reliability and comfort, unless anyone has any ideas about improving the suspension??,         I will post a picture or two at a later date to see what you think of what i have done, sure to have criticism, but hey, life would be so boring if we all liked the same thing.

 

[LenT]

6 minutes ago, ruralrat said:

, i have recently put 19 inch wheels on my f sport and they fill the arches much better, 

Just curious, Chris.

I presume these are bigger wheels, so did you fit low profile tyres on to maintain the rolling radius?

Did you find that they improved the handling but at the expense of ride comfort?

Those are supposed to be the effects so it might be interesting to learn if that’s what you found.

[ruralrat]

Hi Len,

They would have a bigger rolling radius i presume, (225/40/19 front, 255/35/19 rear), At first , there was no difference in the handling , just harder suspension, but now they have ' bedded in' the handling is better, though i have to say that the Bridgestone weather control on the 18's were quite impressive too, I have stuck with the Bridgestones, but now i have Potenza Sports on the 19's, 

Keeping on the same subject, has anyone else had problems with 'stepping' on the inside of the rear tyres?, I have read that it's something to do with the factory settings on camber and castor, would appreciate any info on this, and what is the best settings to stop it happening?, 

Cheers peeps

[ColinBarber]

10 hours ago, ruralrat said:

They would have a bigger rolling radius i presume, (225/40/19 front, 255/35/19 rear)

By not altering the the tyre profile as you moved up a wheel size you have changed the rolling radius by almost 4%. You speedo will be more accurate (as by design it reads over), and you odometer will show less miles than you actually travel.

I'd normally only expect to have stepping when on full lock, and if so probably not worth worrying about it - and try to avoid full lock anyway. Are you getting it at other times?

Whilst the geometry won't have changed by altering the rolling radius, the way the car behaves will change and you may need to deviate from the stock settings to optimise your setup. You are best to go to a specialist to get your geometry set up.

[ruralrat]

sorry, been so long since i have been on here, 

Thank you for that Colin, it steps only when on full lock , more noticeable when the road is wet, the car seems to 'skip' sideways a little, it feels horrible, and it can't be doing the tyres any good, The other issue is that the rear tyres were wearing on the inside edge with the previous 18" wheels , which is strange because the car had 4 wheel alignment done to Lexus spec, and i thought this is what was meant by 'stepping' because this was on the Lexus garage video report they sent me, will be taking it to the tyre fitters today to get checked out.

[MatIS300h]

Hi all,

Do I understand correctly that the only thing I need to remember when changing discs and pads on the IS300h, is to make sure the key is far enough from the car, so it doesn’t engage the brakes while replacing them?

I’m guessing it’s all done while the cars is locked as it would lock itself anyway after a while?

I’ve read someone had an issue and an error came up on the screen after the brakes were replaced. The error meant something like the regenerative braking is not working etc.

Thanks

[IS300FSPORT]

10 hours ago, MatIS300h said:

Hi all,

Do I understand correctly that the only thing I need to remember when changing discs and pads on the IS300h, is to make sure the key is far enough from the car, so it doesn’t engage the brakes while replacing them?

I’m guessing it’s all done while the cars is locked as it would lock itself anyway after a while?

I’ve read someone had an issue and an error came up on the screen after the brakes were replaced. The error meant something like the regenerative braking is not working etc.

Thanks

Disconnect the 12v Battery as a precaution & crack on.

Changing the brakes is not an issue its like any other car, its the bleed procedure when changing the brake fluid that can land you in trouble if not done properky there are warnings the drivers door should not be opened whilst the bleed valve is open as it loads up pressure when the door is opened.

For Hybrid procedure skip to  11:00 the carcarenut explains it better.