Base Integra Vtec

[davidaff]

I own a base Integra and have come to realise, especially with the cold air going around that there is actually a vtec crossover at 5,500 rpm. To be fair I can't feel any of it, but I can clearly hear it so it's definitely there. At the end of the day it still is a vtec motor, but then you usually wouldn't hear a crossover on a Euro, which actually does have a more powerful motor.

Would anyone have more information on this? Is this common on all non-type R I-Vtec motors?

[joel89]

If u change the exhaust and put a pod filter on I belive u will here the cross over more

[Indie]

You haven't said exactly which Integra you actually own, but I'm assuming from the mention of I-VTEC that you have a DC5?

And what's the problem exactly? That you can't hear the VTEC, or that you can't feel it?

[davidaff]

Sorry, Yeah it's a DC5.

No problem really, thing is I wasn't expecting a crossover at all. I haven't heard a crossover on a Euro or a Jazz, which are the two other cars I've driven that use a non type R I-VTEC motor.

What I'm asking is, is this normal for all I-VTEC motors, and it's only something I've missed when I've driven other I-VTEC's, or is this the case only for Integras?

When I read information on the base model, it says that VTEC engages at 2,800rpm, so what's the crossover at 5,500rpm for?

[Stephen_AUS]

VTEC and crossover are the same terms, they mean the same thing. Honda now call all new engines iVTEC, doesn't mean that it's not a type r engine that it doesn't have VTEC. An Accord Euro Sport has a K24 with VTEC crossover, Civic Sport has K20 with VTEC crossover, All DC5's has VTEC crossover, but something like a Jazz or CRV has the iVTEC name and economical engine stuff, but no VTEC crossover because they don't have the valve timing and lift. Have a look at this http://en.wikipedia.org/wiki/K20A2#K_Series

[davidaff]

Ok fair enough. But then why does the information on the base model say that VTEC engages at 2,200 rpm?

[Stephen_AUS]

Ok fair enough. But then why does the information on the base model say that VTEC engages at 2,200 rpm?

Could be the US model.

[mocchi]

VTEC and crossover are the same terms, they mean the same thing. Honda now call all new engines iVTEC, doesn't mean that it's not a type r engine that it doesn't have VTEC. An Accord Euro Sport has a K24 with VTEC crossover, Civic Sport has K20 with VTEC crossover, All DC5's has VTEC crossover, but something like a Jazz or CRV has the iVTEC name and economical engine stuff, but no VTEC crossover because they don't have the valve timing and lift. Have a look at this http://en.wikipedia.org/wiki/K20A2#K_Series

I thought IVTEC means that it is an "Intelligent VTEC".
Intelligent in the sense of being able to adjust it's ignition timing by the use of VTC (Variable Timing Control).
A car can have VTEC (2 camshaft profiles) in exhaust and intake like Type R variants, Type S, Euro CL7, or only have VTEC (2 camshaft profiles) on intake camshaft like CRV?.

[Stephen_AUS]

I thought IVTEC means that it is an "Intelligent VTEC".
Intelligent in the sense of being able to adjust it's ignition timing by the use of VTC (Variable Timing Control).
A car can have VTEC (2 camshaft profiles) in exhaust and intake like Type R variants, Type S, Euro CL7, or only have VTEC (2 camshaft profiles) on intake camshaft like CRV?.

Yes iVTEC is 'intelligent'. When we talk about VTEC, davidaff is talking about crossovers within the variable valve timing and lift of the engine. iVTEC was invented for improved fuel efficiency and is know to have continuously variable camshaft phasing on the intake cam. iVTEC has two types of motors, the general and sports/performance. With the DC5 or DC5R, they have the performance iVTEC, both intake and exhaust has 3 cam lobes each per cylinder with the two different profiles (example; normal 20deg, vtec 30deg).