My over-polished IS300 daily & track car - Page 2 - Lexus IS Forum
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post #16 of 51 (permalink) Old 02-17-2019, 05:57 AM
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Yikes! That hub shearing off must've been an intense on track experience!

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post #17 of 51 (permalink) Old 02-17-2019, 04:26 PM Thread Starter
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Originally Posted by mesooohoppy View Post
that looks like the hub shank sheared off. were you by chance running something other than an OEM hub?
Yes, bought from a supplier claiming OEM quality bearings and spindles, bearings were OE Koyo, but the spindles were junk as it turns out. if it doesnt come in a toyota/lexus package, i'm not using it

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post #18 of 51 (permalink) Old 02-17-2019, 04:30 PM Thread Starter
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Originally Posted by dexefcs View Post
Yikes! That hub shearing off must've been an intense on track experience!
I lucked out really, it was going to happen sometime, and it chose the track to go. I had just dipped 2 tires into the dirt at corner exit, was crossing over the track setting up for the next corner when it let go. thought I blew a tire initially. thankfully no body damage though.

the racetrack is probably the best place to have a failure, everyone around you is paying attention, has some car control skills and is watching out for anything. If a failure like this happened on the road I'd immediately get hit by some idiot in a honda pilot texting or whatever. sure woke me up at 80 mph tho

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post #19 of 51 (permalink) Old 02-18-2019, 06:47 AM
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it was going to happen sometime, and it chose the track to go.
Unless you hit a curb, you'd probably never load the hubs up on the street the way you do at the track. I suspect these kinds of sub-standard barely good enough parts are everywhere but because street driving really doesn't load up the parts the way track driving does, they work adequately.

I 100% agree with your OEM only stance. I won't even use aftermarket ballpoints these days.

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the racetrack is probably the best place to have a failure,
It depends on the track too. My local track has minimal runoff room. There are gravel traps but plenty of people still find hard things to run into. I had a big off at VIR once. If it had happened at my local track, I'd have totaled the car. As it was, I just had to vacuum all the grass out of the interior.
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post #20 of 51 (permalink) Old 02-18-2019, 08:29 AM
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What are those seats i really like those!

2002 IS300 1095rwhp Alpha Tuned

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post #21 of 51 (permalink) Old 02-18-2019, 09:27 PM Thread Starter
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What are those seats i really like those!
The seats are Corbeau RRB on corbeau sliders and Planted seat brackets. They aren't FIA seats but I dont have a cage so it doesnt really matter. they are reclining which is why I ended up with them, comfortable, look great, made a huge difference for motorsports too. mine have been in for almost 2 years and they still look pretty much new amazingly. I'm a little bummed now though, they have them with colored diamond stitching at no extra charge, which look amazing, mine are just the basic cloth and vinyl ones.
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post #22 of 51 (permalink) Old 02-18-2019, 09:30 PM Thread Starter
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Originally Posted by humbucker87 View Post
I also can't wait to see/hear more from this build. Seems very similar to mine except that mine is only used for fun duty on the street, not daily. Looks great. Thanks for the specs on the tires, etc. I've been wanting to run something wider than my current 225 tires.

I'm actually heading to the track this coming weekend. Have recently added FRS Diff, Apexi SAFCII, and a homemade ghetto diffuser.

Here's the link to mine:
https://www.my.is/forums/f219/diamon...-build-593113/
How much does the 410 gear diff change power output, or do you have a different transmission than stock? the w55 already seems to have pretty damn short gears with the 373

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post #23 of 51 (permalink) Old 02-19-2019, 08:58 AM
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Originally Posted by silver-lexi02 View Post
How much does the 410 gear diff change power output, or do you have a different transmission than stock? the w55 already seems to have pretty damn short gears with the 373
I have the stock w55. It's certainly made the car feel faster on the street. Of course it won't actually change my power output, but rather when the power is delivered. I've attached the new max speed calculations I've made for each gear. I'm heading back to VIR this weekend (although it looks like rain so I'm not sure I can compare lap times). It will be interesting to see where my shift points change. I'm well aware that any added acceleration might actually be cancelled by extra shifting. In the past on VIR full course I am in 3rd or 4th gear for the whole lap (never above 129mph).

I don't daily drive the car so I don't spend much time on the highway. That might be a deal breaker since the car will have a higher RPM while cruising, but so far it hasn't bothered me at all.

Edit: I should add that I've been thinking about and comparing our car to SpecE46 cars as well. In theory they should be somewhat close competitors (3.0 I6, RWD sedan, 5 speed). The basic recipe for those cars is 225 rwhp, gear ratios are almost identical with the 4.10 diff, 2855 lbs (that is my biggest disadvantage right now since I have full a/c, interior, sun roof), and 255 Toyo RR tires.

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post #24 of 51 (permalink) Old 02-19-2019, 06:55 PM Thread Starter
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Originally Posted by humbucker87 View Post
I have the stock w55. It's certainly made the car feel faster on the street. Of course it won't actually change my power output, but rather when the power is delivered. I've attached the new max speed calculations I've made for each gear. I'm heading back to VIR this weekend (although it looks like rain so I'm not sure I can compare lap times). It will be interesting to see where my shift points change. I'm well aware that any added acceleration might actually be cancelled by extra shifting. In the past on VIR full course I am in 3rd or 4th gear for the whole lap (never above 129mph).

I don't daily drive the car so I don't spend much time on the highway. That might be a deal breaker since the car will have a higher RPM while cruising, but so far it hasn't bothered me at all.

Edit: I should add that I've been thinking about and comparing our car to SpecE46 cars as well. In theory they should be somewhat close competitors (3.0 I6, RWD sedan, 5 speed). The basic recipe for those cars is 225 rwhp, gear ratios are almost identical with the 4.10 diff, 2855 lbs (that is my biggest disadvantage right now since I have full a/c, interior, sun roof), and 255 Toyo RR tires.

Doesn't look like it has shortened the gears to much, I'm bound by SCCA street touring rules and cant change rear end ratio, although I do like just being in 3 and 4 on the track and having enough torque to dig out of corners.

my car ready for the track is 3091lbs with 1/4 tank of gas, a few hundred pounds lighter than stock but still a good 300-400lbs heavier than my competition (damn 86 twins)

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post #25 of 51 (permalink) Old 02-19-2019, 08:30 PM
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3.74 beaks down at 1000.100/10 rpms.. So 3.74 to 4.10 is a difference of 300 rpms.
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post #26 of 51 (permalink) Old 02-20-2019, 06:06 PM Thread Starter
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3.74 beaks down at 1000.100/10 rpms.. So 3.74 to 4.10 is a difference of 300 rpms.
Thats not to bad, probably makes for a bit more dig out of the corners at the very least, let me know how it goes

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post #27 of 51 (permalink) Old 03-19-2019, 05:38 PM
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What are your alignment specs?

What other cars does the IS stack up to? Can it keep up/how does it compare to other cars?

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post #28 of 51 (permalink) Old 05-07-2019, 12:03 AM
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Quote:
Originally Posted by silver-lexi02 View Post
I've done Motorsport Ranch, Cresson, TX on a bunch of configurations more times than I can count, I've driven COTA in my other car, and I've done Texas motor speedway infield course a few times and a bunch of fun laps on the oval. Theyre rebuilding Eagles Canyon right now and LGmotorsports is supposed to be building another track up north of dallas.



The RT615k+s I really like on track, they suck for autox tho. on track they get to temp pretty fast, and stay consistent lap after lap, its tough to overdrive them, and good god they are cheap. $620 for a set of 255s, and they hold up to the track abuse, dont wear down super fast.



running figs bushings everywhere, Truhart Rear LCAs, Fortune auto 500s with 14k/12k swift springs, a 32mm hotchkis front sway on the stiffest setting, and a stock rear sway bar (with the hotchkis rear bar the rear end was really loose, especially under hard braking)



these cars are a ton of fun on the track, but the stock front brakes are pretty terrible, I cooked both front calipers and rotors a couple years ago, they just arent up to stopping such a heavy car.
how many track days have you put on the falkens? i just did day 7 on my federal 595 rs-rr

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post #29 of 51 (permalink) Old 05-09-2019, 08:41 PM
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Hey man, I'm getting into track days in my IS and I have a kinda weird but quick question.

What mud flap/guards are you using? I fit a set of sticky tires (re71r) for the first time on this car and as you know they kick up every piece of dirt, dust, and rocks all over the paint.

02 IS300 GGP - manual w/ LSD, full leather, nav, 204k miles

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post #30 of 51 (permalink) Old 05-10-2019, 04:16 PM
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Love it! I like the idea. Although mine seems to be a dog around turns. Not sure maybe I need new coilovers or struts. Not too good at balancing out the ride.
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