Engine Boring?

[chrisb]

Has anyone had the engine bored out????

CB

[chrisb]

can ANYONE shed ANY light on this even if its not yaris specific!!!

amount of size in cylinders gained??

rough bhp gains??

cost??

???????????????????????????

CB

[jaxx]

i know a lad who had a mini bored from 1275 to somat just under 1.4! obviously a 100cc increase with all the new gubbins and i gotta say it did make a good difference

[chrisb]

has anyone thought of having this done???

can u foresee any problems with having this done,i.e wiuth the ecu??

CB

[Yarisboy]

engine boring is most effective on big v6/v8 engines etc cos there's so much more power to release.

Would boring a yaris not mess up the vvti?

I used to chat go an american guy with an echo, and he had somethin installed which meant that when he pressed a button his VVT-i would kick in at 1000rpm instead of 4500rpm....

this would make a GREAT difference to this little car, fuel consumption would be scary though.

[Sim]

Hi

When does the vvti actually kick in does anyone know as this has been talked about before but noone seemed sure. I thought it was across the ref range at various points not just at high revs. People with VTEC seem to feel it is a one point (5000 or 6000). I thought that was what the intelligent was about. Interesting about the button wonder how that would work and performance difference would make?

Thanks

si

[Sim]

I have looked it up. Its continous vvt. All explained on following website.

Another Example : Toyota VVT-i

Macro illustration of the phasing actuator

Toyota's VVT-i (Variable Valve Timing - Intelligent) has been spreading to more and more of its models, from the tiny Yaris (Vitz) to the Supra. Its mechanism is more or less the same as BMW’s Vanos, it is also a continuously variable design.

However, the word "Integillent" emphasis the clever control program. Not only varies timing according to engine speed, it also consider other conditions such as acceleration, going up hill or down hill.

http://autozine.kyul.net/technical_school/...ngine/vvt_3.htm

[jaxx]

vvti normally kicks in at roughly 4.5 grand!

apexi make the vtec vvti controller, i want one myself but not seen one in this country yet or where to get one, let alone a price!

[Sim]

Do people even read the follow on posts?

[SuperRetard]

Do people even read the follow on posts?

:P

[Yaris WRC]

the t-sport engine can be bored out to nearly a 1.7L time will tell on hp increase and vvti problems B) , i cant really see there being any though.

[chrisb]

WRC have u had this done or now anyone thats had it done??

if u do or u find out could u post the results?????

CB

[Yaris WRC]

yes i will post results when its doen. but can anyone tell me why i dont get emails telling me the threads have been updated???!!!! i even clicked on the 'follow thread' button

[jaxx]

yes i will post results when its doen. but can anyone tell me why i dont get emails telling me the threads have been updated???!!!! i even clicked on the 'follow thread' button

id pass that one on to Steve buddy??

[chrisb]

Do u have/would u have to get the ecu chipped to increase the amount of fuel i njected into the cylinders as they would be increasing in size???

[Yaris WRC]

it might be able to do it on its own, but i dont honestly know. im gettin ECU stuff anyway dont know yet if its gonna be stand alone or piggy back