60mm vs 65mm throttle body?

[jimmyhackers]

theoretical/possible gains between the two?

cars a 306 gti6

2.0l NA engine already at 167ish bhp from factory.

the intake port on the inlet manfold is already about 65mm as is. i did a light rework/flow of the throttle body with some improvements felt, then went and found a throttle body that was 65mm and wondered about just swapping to that.

thoughts?

[E-bmw]

Did similar on an e36 & r53.

ANY restriction removed CAN help. whether it is noticeable or not may be a different question.

[stevieturbo]

I'd be very surprised if it made any difference.

And then the TPS would need to be set to the same parameters as original, and if it did make any difference which it might do low down at smaller openings....the ecu may need adjusted to suit any different airflow at various throttle openings.

But I doubt it will actually offer any more power, just a different feel relative to same throttle position.