top speed?

[eco]

Ok,I got to 115 on my stock tires,I was on a flat part of the higway,no hills,I havnt tried to beat any records yet,but Ive heard the limiter is set at 118.when I was at 105moh it took about 15sec to get to 115,so 118 may be right,it didnt have much power at that speed,but rpms were around 5000,so it had some headroom,just not enough torque,dont get me wrong,it handled awsome(that was before any mods,I have plenty now) at that speed.But I cant beleive the 120mph man,but maybe,I just find it hard to beleive,because Ive been close.And if you hit it one more time,take a pic,not just proof to me,but maybe as a trophy for you,like this for me,until next time.Ima wait till I get my new headers,exhaust and grounding kit before I try it again,I wanna see what improvments all that money gets.

[eco]

[DARKYARIS]

185 km/hr (GPS confirmed) Speed limiter cuts out, just like someone turned the ignition off. Canadian 3dr RS 5spd

[eTiMaGo]

About 185 here too, but I don't think there was a speed limiter, we just ran out of straight road

[ChinoCharles]

Yep, 115 MPH... hahaha.

[DARKYARIS]

Originally Posted by punch

i posted this info, and others jumped all over me, so be wary!!!

U AINT KIDDIN !!!!

[Black Yaris]

115mph here as well..... I want to get rid of that damn speedlimiter.... or use a programmer, or something I can return to stock for warranty issues

[Katana]

Ι have reached the speed of 187km/h and there were at about 2000rpm more.

[eco]

Katana,were you going down hill.

[Kitt]

155 KMS/h (110 MPH), manual, it feels OK for me actually...

[Pars]

Does anyone know if the North American Yaris can stay above 180 km/hr for hours without putting excessive wear and tear on the engine?. Personally, I think the car can handle about 160km/hr on a long distance trip but anything higher might be a problem. My old 98 Civic Hatch could cruise all day long at 180km/hr, it'd be nice if the Yaris could do the same.

[07WYarisRS]

Originally Posted by Pars

Does anyone know if the North American Yaris can stay above 180 km/hr for hours without putting excessive wear and tear on the engine?. Personally, I think the car can handle about 160km/hr on a long distance trip but anything higher might be a problem. My old 98 Civic Hatch could cruise all day long at 180km/hr, it'd be nice if the Yaris could do the same.

YES
The engine can run at any rpm below red line as long as you want.
Providing you are using an oil to keep up with the high demands of a racing engine and spark plugs and cooling system that works efficiently enough to remove and exchange the heat.

But that being said any engine will wear faster with higher rpms there is no getting around it.
running it at about 2X the normal cruise speed will wear the engine out in 1/2 the time.
For instance a car that runs 500,000km at 3000 rpm may only last 250,000km running at 6000 rpm.

Many cars put a rev limit at the redline to prevent engine over revving.
Motor cycles and ATV on the otherhand often have a redline much lower then an actual preset rev limit. Like my bike for instance has a redline of 6500rpm with a rev limit of 8500 rpm.

Redline = highest peak Hp in the power curve. Shifting at or before redline will usually always yeild the fastest eceleration

Rev limit is a preset ignition or fuel cut off to prevent an engine from revving too high and causing engine damage. Over revving causes valve float where the valves actually stay open and come into contact with the pistons, over revving is also hard on rods and rod bearings

[eTiMaGo]

aaah thatnks for that info, I was wondering myself, how an engine's redline and rev limit were defined..

So if one was to improve an engine so as to run safely at high RPMs, that would mainly involve beefing up the valve springs, as well as weight balancing the pistons and rods to eliminate vibration, right?

[07WYarisRS]

Originally Posted by eTiMaGo

aaah thatnks for that info, I was wondering myself, how an engine's redline and rev limit were defined..

So if one was to improve an engine so as to run safely at high RPMs, that would mainly involve beefing up the valve springs, as well as weight balancing the pistons and rods to eliminate vibration, right?

You got it!
Lighter, stronger components if you plan on pushing past the engines design limits, along with timing changes and fuel management.

With a stock internal engine run a 40 or 50W synthetic
Replace the engine coolant with Evans NPG or "engine ice" with remote bypass turn on switch
Drop one heat range colder with NGK iriduim plugs
and the stock engine could run at redline as long as you want with no problems.

[Pars]

Originally Posted by 07WYarisRS

YES
The engine can run at any rpm below red line as long as you want.
Providing you are using an oil to keep up with the high demands of a racing engine and spark plugs and cooling system that works efficiently enough to remove and exchange the heat.

But that being said any engine will wear faster with higher rpms there is no getting around it.
running it at about 2X the normal cruise speed will wear the engine out in 1/2 the time.
For instance a car that runs 500,000km at 3000 rpm may only last 250,000km running at 6000 rpm.

Makes sense.

In the case of my 98 Civic Hatch, I was driving near to redline from Kinston to Toronto (2.5hr drive) and I ended up cracking the head-gasket at the end of the trip (It started to leak air into the coolant). But I think it was other factors that lead to the gasket failure... There was already 20,000km on the engine oil (regular filters but Mobel-1 oil), coolant reservoir was empty at start of trip (but radiator was almost full), and radiator had 300,000km on it and the bottom half of the fins were all flatten from stone chips. Oh well, the car seemed indestructible, so I started to neglect on the maintenance

One good thing that came out of the episode, it was the motivation I needed to land me a Yaris.

Since I'm not using synthetic (or heavy oil) and I don't know the capabilities of the stock cooling system, I better keep a cap on things for now.

[sanchez]

i got mine up to about 112 with no mods and it was still quiet as a mouse