When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Stock IS350s actually run low 13s pretty consistently. FBO are in the 12s. Specifically 2006-2015 models which came with a 4.08 differential that multiplies low end torque greatly.
The one I raced was my brother’s, it has a resonator and muffler delete, otherwise stock.
This isnt new information, theres plenty of posted times all over.
It's not new, because it isn't true. There are no truly "stock" 2IS350s running low 13s. They would have some modifications to do that, weight reduction, tune, or drag radial to help with launch.
The closest I've seen claiming stock is a 13.41. But tires could be upgraded.
That dragy slip is from RedSpencer, who had the world record for a very long time, and you left out the laundry list of modifications he had to run a 13.0...
Last edited by TreysGS460; Feb 19, 2026 at 05:11 PM.
It's not new, because it isn't true. There are no truly "stock" 2IS350s running low 13s. They would have some modifications to do that, weight reduction, tune, or drag radial to help with launch.
The closest I've seen claiming stock is a 13.41. But tires could be upgraded.
That dragy slip is from RedSpencer, who had the world record for a very long time, and you left out the laundry list of modifications he had to run a 13.0...
That “Laundry list” of mods barely added 10-20 whp and 20-30 wheel torque from stock. That kind of increase typically accounts for maybe 0.1–0.3 seconds in the quarter mile, not an entirely different performance tier.Stock IS350s running low 13s is supported by lots of real data slips if you took a second to look.
That “Laundry list” of mods barely added 10-20 whp and 20-30 wheel torque from stock. That kind of increase typically accounts for maybe 0.1–0.3 seconds in the quarter mile, not an entirely different performance tier.Stock IS350s running low 13s is supported by lots of real data slips if you took a second to look.
That laundry list included suspension, wheels, tires, engine, exhaust mods, and a $2000+ Limited slip differential, its quite a bit.
A 13.4 is not a low 13, it's a mid 13 at best.
Again, there are none running low 13s truly stock, in the last link you provided, he clearly list some mods, AND weight reduction, you just have to read it...
You don't need to argue, once your dragy comes in, you can show us what your brothers IS and your LS are running.
Change of plans, it’s not staying stock.
I was going to leave all mods for the IS F I plan on getting later this year, but now I genuinely want to see how far this LS 460 can go. Goal is low 13s, hopefully a high 12 on minimal mods.
I’ve already pulled a total of 86lbs extra weight out. I also removed the intake box resonator combs and smoothed out the airbox, and while monitoring MAF flow on Techstream I saw peak airflow at redline increase from 28–29 lb/min to 31–32.5 lb/min. Combined with the weight reduction it was an extremely noticeable difference on the first drive. The only downside is it’s noticeably louder now and has a loud whiney sound under load.
Biggest issue I notice with these cars isn’t power, it’s seems to struggle with traction. So I’m going 285/40/18 Pilot Sport 4S on around 31 psi to maximize contact patch and sidewall to help it actually hook.
After better tires Ill be aiming for a 3.77 diff to wake it up through the gears, and continuing weight reduction including muffler and resonator delete with lightweight titanium piping.
Simple goal. More grip, shorter gearing, less weight… ill pick up a dragy along the way to see how each mod affects it.
Change of plans, it’s not staying stock.
I was going to leave all mods for the IS F I plan on getting later this year, but now I genuinely want to see how far this LS 460 can go. Goal is low 13s, hopefully a high 12 on minimal mods.
I’ve already pulled a total of 86lbs extra weight out. I also removed the intake box resonator combs and smoothed out the airbox, and while monitoring MAF flow on Techstream I saw peak airflow at redline increase from 28–29 lb/min to 31–32.5 lb/min. Combined with the weight reduction it was an extremely noticeable difference on the first drive. The only downside is it’s noticeably louder now and has a loud whiney sound under load.
Biggest issue I notice with these cars isn’t power, it’s seems to struggle with traction. So I’m going 285/40/18 Pilot Sport 4S on around 31 psi to maximize contact patch and sidewall to help it actually hook.
After better tires Ill be aiming for a 3.77 diff to wake it up through the gears, and continuing weight reduction including muffler and resonator delete with lightweight titanium piping.
Simple goal. More grip, shorter gearing, less weight… ill pick up a dragy along the way to see how each mod affects it.
Nice, Definitely on the right track.
I went from a 255 PS4S to a 275, and that really helped with launches, but I'm still struggling with the stock diff.
I would avoid that aggressive of a final drive, as the individual gears are pretty aggressive, a 3.1-3.3 LSD would be much better.
I went from a 255 PS4S to a 275, and that really helped with launches, but I'm still struggling with the stock diff.
I would avoid that aggressive of a final drive, as the individual gears are pretty aggressive, a 3.1-3.3 LSD would be much better.
From what I’ve learned on this platform, 1st gear torque is already very aggressive and the moment one wheel slips, VSC steps in and kills the run. Add a 3.77 and 1st becomes even more torque-heavy, which is why I think many 3.77 LS 460s even with tunes struggle to break 5 seconds
All my testing will be with VSC fully off, so grip alone determines the result.
As i said first focus is tires. With a torque-heavy launch, I’m planning at least a 45 sidewall and rear pressures around 28–31 psi to help absorb the initial hit and stay planted.
Since I removed 86 lbs, I’m also considering limited ballast over the rear wheels while keeping weight under what was removed, this way that weight is contributing regardless of the weight reduction.
If I can get it to hook consistently, the 3.77 may very well be the answer to a 4s 0-60 and low 13 run.
Gears will not effect 1/4 mile unless you tune it to run out of gear in direct drive on the trans. It will then be a one trick pony with no top end outside of the 1/4 because gearing doesn't effect total power just when it is delivered.
I tried most of this, the car just isn't that fast because of the slow shifting trans and intrusive software while having low relative wheel torque per given gear vs speed range and limited engine torque. If you want fast get something else
Last edited by Striker223; Feb 28, 2026 at 09:43 PM.
total weight taken off ~ 160lbs
Using my speedometer to run 0-60 marked 4.68 seconds, and felt every bit faster than my previous runs.
Also to highlight the improvement, my friend has a 2019 Ford Expedition with a twin turbo v6 and a 10 speed trans(400hp - 480ftlb). He used to smoke me from a dig and slightly pull ahead from rolls. Its not even close now he jumps ahead slightly from digs but I reel him in quick, from roll i jump ahead and take off past 100.
My next weight reduction should be most significant, which is muffler+res delete and should be around 70-80lbs, then summer tires next. Ill be ordering a dragy this week.
Everytime I pass one of those stationary radar signs my Lexus speedometer regularly reads 2-3 mph slower. Until reading this thread I never thought about it being by design, but I wouldn't doubt it.
However, with both my Ferraris, to quote Mona Lisa Vito, they are "dead on ***** accurate"!
total weight taken off ~ 160lbs
Using my speedometer to run 0-60 marked 4.68 seconds, and felt every bit faster than my previous runs.
Also to highlight the improvement, my friend has a 2019 Ford Expedition with a twin turbo v6 and a 10 speed trans(400hp - 480ftlb). He used to smoke me from a dig and slightly pull ahead from rolls. Its not even close now he jumps ahead slightly from digs but I reel him in quick, from roll i jump ahead and take off past 100.
My next weight reduction should be most significant, which is muffler+res delete and should be around 70-80lbs, then summer tires next. Ill be ordering a dragy this week.
I had thought to ask about the weight of the mufflers, since I deleted mine, but I added a much heavier subwoofer box housing a 15. Reading earlier posts, I jumped to wanting to retain stock weight distribution and/or add to the rear, but I have probably come close to that. (I dunno where my donkey offsets when I crawl behind the wheel...)
I had thought to ask about the weight of the mufflers, since I deleted mine, but I added a much heavier subwoofer box housing a 15. Reading earlier posts, I jumped to wanting to retain stock weight distribution and/or add to the rear, but I have probably come close to that. (I dunno where my donkey offsets when I crawl behind the wheel...)
I unbolted the entire muffler and took it off with pipes so the weight includes them. Id say 4lbs with them vs without.
Update on findings, stock E85 mix with 91 under e30 have had unbelievable results once the ECU adjusts fuel trims. Its too much power for my current wheels and I spin every launch, when it hooks it pulls like a different car, it plants you in your seat hard through every gear. Hopefully going to tune it soon. I picked up new wider and lighter rims. I will be throwing 265 Summer tires on soon.
Gears will not effect 1/4 mile unless you tune it to run out of gear in direct drive on the trans. It will then be a one trick pony with no top end outside of the 1/4 because gearing doesn't effect total power just when it is delivered.
I tried most of this, the car just isn't that fast because of the slow shifting trans and intrusive software while having low relative wheel torque per given gear vs speed range and limited engine torque. If you want fast get something else
Aftee the dif swap, 180lbs weight reduction, wider stickier tires and lighter rims. Ive currently beaten Audi S3, New Mercedes C43 AMG, Mustang Mach E, and 6th gen Camero SS. All from stoplights and im never fully hooking, with trac control off i spin enough to trail smoke behind me.
Dragy coming in on friday, im expecting high to mid 4s 0-60 and maybe mid 13 quarter mile, i need to tune the speed limiter out as it completely halts power at 105 now and i assume that will affect 1/4, otherwise itll just help with my speeding habits haha.
