Fit vs Yaris

[Barneyncp93]

From power perspective, Yaris beats Fit anytime. Vvt-i beats vtec. L15a needs to go to higher lifts to match the 1nzfe power (that's when vtec is on), in terms of airflow. Now, how can vtec match the bigger overlap (vvt-i), especially when the exhaust is strong?

Over certain Rpm, say 2000, vtec can not match the efficiency vvt-i has. Vtec can beat vvt-i when vtec is not on, but what is the power?

It is about the same when you compare 4AFE to L15A when talking about efficiency. L15A beats 4AFE anyday because L15A flows more.

[IllusionX]

Originally Posted by Barneyncp93

From power perspective, Yaris beats Fit anytime. Vvt-i beats vtec. L15a needs to go to higher lifts to match the 1nzfe power (that's when vtec is on), in terms of airflow. Now, how can vtec match the bigger overlap (vvt-i), especially when the exhaust is strong?

Over certain Rpm, say 2000, vtec can not match the efficiency vvt-i has. Vtec can beat vvt-i when vtec is not on, but what is the power?

It is about the same when you compare 4AFE to L15A when talking about efficiency. L15A beats 4AFE anyday because L15A flows more.

Old school vtec yes. Isn't iVTEC just the same as VVT-I?

[Barneyncp93]

Originally Posted by IllusionX

Old school vtec yes. Isn't iVTEC just the same as VVT-I?

I see what you mean. And it is true that i-vtec is the same as vvt-i as both move intake cam timing continuously. But honda so far has pure ivtec only on their K engines (eg. accord, crv, civic)
Other than K engines, honda has the right to put the ivtec emblem but it is not pure ivtec.

[Thirty-Nine]

Originally Posted by IllusionX

Old school vtec yes. Isn't iVTEC just the same as VVT-I?

VTEC and iVTEC has variable lift. VVT-i is only variable timing. VTEC has both variable timing and lift. VVTL-i is the Toyota equivalent of VTEC. VVTL-i was found in the Celica GTS, Matrix XRS, and the Toyota Corolla XRS.

How it Works:
http://www.superstreetonline.com/how...c-ivtec-works/

[Barneyncp93]

Originally Posted by Thirty-Nine

VTEC and iVTEC has variable lift. VVT-i is only variable timing. VTEC has both variable timing and lift. VVTL-i is the Toyota equivalent of VTEC. VVTL-i was found in the Celica GTS, Matrix XRS, and the Toyota Corolla XRS.

How it Works:
http://www.superstreetonline.com/how...c-ivtec-works/

That's a good link.

The link also explains as I understand that vvtL-i is like i-vtec.

You can also read there, that vvt-i since it keeps maximizing the timing (the overlap=power) has more power and becomes more efficient overall (by advancing intake timing) than vtec.

When vtc is added to vtec, it becomes i-vtec (lift + timing).

Don't look at the standard power number. If you can, look at the potential power vvt-i has compared to vtec. vvt-i rules anytime against vtec.