Toyota Supra Break In Period

DesmoSD said:

Proper break in!

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i thought the supra was electronically limited to 150 mph

It is limited to about 265kmh / 164mph

DesmoSD said:

Proper break in!

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But...but...Toyota said only 155!

I guess the power and torque aren't the only things underrated

So wait, 163 mph top speed max RPM?

SpamSupra said:

i thought the supra was electronically limited to 150 mph

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Goose said:

But...but...Toyota said only 155!

I guess the power and torque aren't the only things underrated

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Can't really expect Toyota to know the specs on an engine that they didn't build.

Rotaryrunner said:

It is limited to about 265kmh / 164mph

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DesmoSD said:

Can't really expect Toyota to know the specs on an engine that they didn't build.

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Looks like it still has 2 gears to go through if it had no governor. I was about to say my Ford Focus ST can do 165mph, no way this car can’t beat that.

Turbro said:

Looks like it still has 2 gears to go through if it had no governor. I was about to say my Ford Focus ST can do 165mph, no way this car can’t beat that.

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Yeah. I wonder where the tach needle is going to go once they get rid of all of that crap, start making some power and rev higher.

Well, this the first turbo car I've ever driven, let alone owned...so needless to say I've not done the whole proper break-in. I'm only at 60 miles or so, is it too late for me to get my act together? Seriously I'm freaking out I just F**ked up the most expensive car I've ever owned from a long term reliability stand point. Like should I change the oil immediately?

whostorm05 said:

So wait, 163 mph top speed max RPM?

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There are 2 gears left

But the 7th should be the top speed gear after tuning and removing the limiter.

Ryanthetemp said:

Well, this the first turbo car I've ever driven, let alone owned...so needless to say I've not done the whole proper break-in. I'm only at 60 miles or so, is it too late for me to get my act together? Seriously I'm freaking out I just F**ked up the most expensive car I've ever owned from a long term reliability stand point. Like should I change the oil immediately?

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Calm down and just stay away from the throttle for the next 1000miles.
It's okay modern engines can handle a little bit of stupidity. ( no offence )

Ryanthetemp said:

Well, this the first turbo car I've ever driven, let alone owned...so needless to say I've not done the whole proper break-in. I'm only at 60 miles or so, is it too late for me to get my act together? Seriously I'm freaking out I just F**ked up the most expensive car I've ever owned from a long term reliability stand point. Like should I change the oil immediately?

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Did you read the link I posted. You actually already missed it 40 miles ago.

What's The Best Way To Break-In A New Engine ??
The Short Answer: Run it Hard !

Why ??
Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.

If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't.

How Do Rings Seal Against Tremendous Combustion Pressure ??

From the actual gas pressure itself !! It passes over the top of the ring, and gets behind it to force it outward against the cylinder wall. The problem is that new rings are far from perfect and they must be worn in quite a bit in order to completely seal all the way around the bore. If the gas pressure is strong enough during the engine's first miles of operation (open that throttle !!!), then the entire ring will wear into
the cylinder surface, to seal the combustion pressure as well as possible.


The Problem With "Easy Break In" ...
The honed crosshatch pattern in the cylinder bore acts like a file to allow the rings to wear. The rings quickly wear down the "peaks" of this roughness, regardless of how hard the engine is run.

There's a very small window of opportunity to get the rings to seal really well ... the first 20 miles !!

If the rings aren't forced against the walls soon enough, they'll use up the roughness before they fully seat. Once that happens there is no solution but to re hone the cylinders, install new rings and start over again.

Fortunately, most new sportbike owners can't resist the urge to "open it up" once or twice,
which is why more engines don't have this problem !!

An additional factor that you may not have realized, is that the person at the dealership who set up your bike probably blasted your brand new bike pretty hard on the "test run". So, without realizing it, that adrenaline crazed set - up mechanic actually did you a huge favor !!

Yup all of that. There is no "wearing in" of bearings and other contact points. If the clearances were all set right and the motor properly lubricated, the rings to walls are the only metal on metal contact. I would like to think manufacturer's run engines on new cars at the factory enough to get the rings to seal before sending them out the door. Seems like the only sensible thing to do, but doesn't mean its standard practice.

All brand new cars go through a preliminary run on the roller but as Mototune mentions, it's the first 20 miles that really matter. The manual is primarily for legality purposes.

DesmoSD said:

Did you read the link I posted. You actually already missed it 40 miles ago.

What's The Best Way To Break-In A New Engine ??
The Short Answer: Run it Hard !

Why ??
Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.

If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't.

How Do Rings Seal Against Tremendous Combustion Pressure ??

From the actual gas pressure itself !! It passes over the top of the ring, and gets behind it to force it outward against the cylinder wall. The problem is that new rings are far from perfect and they must be worn in quite a bit in order to completely seal all the way around the bore. If the gas pressure is strong enough during the engine's first miles of operation (open that throttle !!!), then the entire ring will wear into
the cylinder surface, to seal the combustion pressure as well as possible.


The Problem With "Easy Break In" ...
The honed crosshatch pattern in the cylinder bore acts like a file to allow the rings to wear. The rings quickly wear down the "peaks" of this roughness, regardless of how hard the engine is run.

There's a very small window of opportunity to get the rings to seal really well ... the first 20 miles !!

If the rings aren't forced against the walls soon enough, they'll use up the roughness before they fully seat. Once that happens there is no solution but to re hone the cylinders, install new rings and start over again.

Fortunately, most new sportbike owners can't resist the urge to "open it up" once or twice,
which is why more engines don't have this problem !!

An additional factor that you may not have realized, is that the person at the dealership who set up your bike probably blasted your brand new bike pretty hard on the "test run". So, without realizing it, that adrenaline crazed set - up mechanic actually did you a huge favor !!

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Man, that makes me feel a lot better driving it like I stole it out of the dealer show room!

This is AMS's break-in procedure for the VR38 and 4G63T. The VR38 uses a plasma coating as the cylinder liner like the B58. This procedure likely applies to both stock plasma liners and sleeved AMS blocks.

On these BMW ECUs, the dealer can pretty much see the entire engine's history, including how the engine was treated, average RPM ranges, the RPM extremes, etc. I don't know if Toyota would use that information to deny warranty, but I suspect if there was a serious engine failure and they could trace it to high RPMs, dyno runs, or abuse during the break-in period, that would not be beneficial for the customer.