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Hey guys, i been looking at the veilside throttle bodies and to say really impressed, but what is the size of the yaris t sport one?

if not V.side what else is available? i cant shop as i dont know the size. hopefullty someone can shed some light on this subject?

Also most important of all, is there a point?

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doesnt the ecu need to be remapped to recognise the need to add more fuel?

Theres a limit where it thinks theres something wrong so it doesnt add more fuel...something like that

I suppose it depends on the increase of air intake

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Sounds about right moffmo because it is a closed loop with limits so it will inject more fuel if there is more air being recorded but only up to a limit. This is obviously because otherwise you could effectively spray endless amounts of fuel into the engine if you were reading a high air flow (Obviously injector capabilities limit it etc.). But yeah i would imagine you would need a ECU remapping if you wanted decent gains from it! (which i guess you would otherwise you would save your money!) Without a remap you may get away with it if the increased air flow readings are still within the ECU's limits. (or am i talking rubbish?)

Does the increased throttle body size increase the amount of air flow recorded or only the amount of that airflow recorded that gets into the engine when the valves open?

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There is a VVTi controller available called the 'CAMCON' - it allows the VVti to be remapped to adjust the air and petrol ratio and when the actuall VVTi kicks in...

Made by a company called power enterprise ...

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Ok this is one of the areas my knowledge is limited in so bare with me! (i want to understand though so please answer!) The VVT-i technology changes the cam at a fixed rpm to change the way the inlet valve is opened (distance and time space?) right? It has two types, one for low revs low emmissions and nice smooth intro curve and then swaps to the agressive more higher peak hp one too give the pull higher up? (the lower one to stil give low end torque and the higher one to give high rev performance?) Right so far? Could you therefore change the two cams so you can make them both more performance orientated to a slight degree with a nice improvement in performance (not neccessarily driveability)? Therefore could you not sacrifice the low end drivability (only a little bit) to improve the early power curve for more performance? and then adjust the higher one by the same amount to get a higher performance overall?

If this is totally wrong please tell me as i want to try to atleast understand it! I understand it isnt all as hunky-doory as that but in theory is this not possible?

Cheers for anyones time and patience!

Woody

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Ok this is one of the areas my knowledge is limited in so bare with me! (i want to understand though so please answer!) The VVT-i technology changes the cam at a fixed rpm to change the way the inlet valve is opened (distance and time space?) right? It has two types, one for low revs low emmissions and nice smooth intro curve and then swaps to the agressive more higher peak hp one too give the pull higher up? (the lower one to stil give low end torque and the higher one to give high rev performance?) Right so far? Could you therefore change the two cams so you can make them both more performance orientated to a slight degree with a nice improvement in performance (not neccessarily driveability)? Therefore could you not sacrifice the low end drivability (only a little bit) to improve the early power curve for more performance? and then adjust the higher one by the same amount to get a higher performance overall?

If this is totally wrong please tell me as i want to try to atleast understand it! I understand it isnt all as hunky-doory as that but in theory is this not possible?

Cheers for anyones time and patience!

Woody

I think its only VTEC or VVTL-i that changes the cams

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by the sound of the post pascal posted, there is a change of cams except there are five profiles which it gradually changes through so you dont really notice a kick as it is constantly doing it! that rite? and vvtl-i also adjusts the time period they are open for hence more noticeable when you get to the higher cams?

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