Technique

Love flooring the car... I do it daily... The best feeling is when the car is brand new... aka less than 100 miles on the odo... Makes the car faster IMHO... Too bad you are past that point, now your IS350 will never be as fast as it could have been...

http://www.infoarena.com/lexus/misc/redline.avi

milky

iTrader: (9)

Everytime you floor it, thats a dollar of gas wasted! haha

ff_

So the car is faster when the engine isn't yet broken in? That goes against everything I've ever seen, experienced, and heard.

drewj12

thats an awesome picture in your signature

Technique

No.

The car is faster if you floor it during break-in... Since the OP is past that point and babied the car during the break-in, his engine will never have the output it could have had...

drewj12

how many miles do you recommend to break in the car? sorry if this was already answered.

Bichon

The IS is throttle-by-wire, which means that the gas pedal does nothing more than twiddle a pair of potentiometers which are read by the computer. The actual angle of the throttle plate is moved by a stepper motor, again controlled by the computer. Unlike in an older car with a throttle cable, there is not a direct correlation between the gas pedal and the throttle plate. So, even though you may never have floored the gas pedal, it doesn't mean that the computer hasn't given the car wide open throttle.

ff_

You stated this as fact, so you must be pretty sure about your answer. Please explain.

I don't see how a car could be faster during break in. If anything, I would think that it'd be fastest at the precise moment when the drivetrain is perfectly broken in.

Technique

Since my previous post explaining my original post obviously did not clear things up for you, let me rephrase, one last time (hopefully)...

"The car is faster AFTER BREAK-IN if you floor it during break-in..."

Bichon

You still don't understand what he is saying. His premise is that the engine will be more powerful later in its service life if it is broken in hard, as opposed to being broken in according to the engine manufacturers directions.

This web page talks about the rationale behind that advice: http://www.mototuneusa.com/break_in_secrets.htm

(personally, I've always broken in my cars according to the manufacturers recommendations)

ff_

Now that you state it that way, I understand your point. The way you stated it "The car is faster if you floor it during break-in" could be taken in more than one context.

HKS350

iTrader: (4)

A break in period is for the entire car.people just think that it only for the motor.the motor is most likely broken in after a good warm up and 200 miles of progressive driving.running the motor at many diff rpm ranges.the reason for no full throttle pulls is so the clutches in the auto tranny get broken in properly(no glazeing).but some light stop and go driving after the 200 mile range should break the tranny in just fine.suspenion takes the longest to break in .when we build race motors we have them broken in ,in under an hour and pull the oil filter for a change.

cvex

I dont think Auto tranny has any clutches to be glaze. Auto tranny = torque converter, hence hydraulic fluid . Are you sure about you building race motors?

HKS350

iTrader: (4)

If your going to call someone out get your facts straight!Their are many clutches in a auto tranny,in fact there is 4-8 per gear.hey don`t take it from me jacka$!.call your lexus dealer. ask a tech.YOU KNOW THE FRIST THREE WORDS OF YOUR STATEMENT SUM IT UP PERFECT...

lobuxracer

iTrader: (2)

That's not at all what I said. I said the rings break-in in about 10 minutes. Full break-in takes around an hour. Progressively greater thermal load with breaks in between steps to allow the pistons to cool and resize themselves.

Here's what I really said.
And here with dissenting opinion.
And here.

Wonderful you follow their instructions. The last time I did that I had an engine that burned a quart every thousand miles. It was a 5F-SE in a Celica. Never will I make that mistake again. The rings never properly seated because I babied it (my second brand new car.) The IS was broken in and brakes bedded at the end of the first hour I owned the car.

Jeremy - you have good intentions, but your words are not conducive to a discussion. This is the Internet. These are not personal attacks and you have no need to defend yourself. Just state your case.

BTW, I disagree about glazing the clutches, and yes, I know there are a few of them in the gearbox. If the fluid is up to temperature, the ECM will take care of the rest. Notice the gearbox won't even shift into 5th or 6th until the fluid reaches a minimum temperature. They've done a lot of work figuring out how to make their gearboxes survive warranty and they've programmed the ECM to help them stay out of warranty repairs.