Is VTEC accurately recreated in this game??

[enphynity]

can you tell a difference when the VTEC is supposed to kick in on the cars with the right motors?? does it sound different??

 

[S2kdrifter]

you can hear it in GT3 so i think you can probably hear it in GT4 to, try an integra type-r in gt3 with a sport or semi racing exhaust and you can hear it quite well.

 

[Daddybird]

Gran Turismo always had it right with the sound (only exeption I think are the racingcars), so in GT4 it will be right again.

 

[Double_R]

wat about vvt-i on the toyotas

 

[Daddybird]

Same.

 

[G-T-4-Fan]

EEERHH...............What's v-tec??

 

[Flip rSx driveR]

From the sounds Akira posted, the i-VTEC in the JDM DC5 Type R sounds pretty close to what I have in my RSX. It's not really a kick, but it sure sounds really hott. 👍

 

[Daddybird]

EEERHH...............What's v-tec??

Honda uses it like this:

The engine has 4 valver per cilinder, but it's variabel, so under 4000rpm the engine runs on 2 valves per cilinder, if you get above the 4000rpm mark it runs on 4 valves per cilinder.
Honda claims that if you stay under the 4k mark the engine uses less fuel and if you get above the mark, the engine has a 'push' (which you can actually feel in real life) so to stay fast, you need to stay above the 4k rpm, to stay economical, below the 4k mark.

Toyota also uses it, but its called VVTI.

 

[Flip rSx driveR]

Honda uses it like this:

The engine has 4 valver per cilinder, but it's variabel, so under 4000rpm the engine runs on 2 valves per cilinder, if you get above the 4000rpm mark it runs on 4 valves per cilinder.
Honda claims that if you stay under the 4k mark the engine uses less fuel and if you get above the mark, the engine has a 'push' (which you can actually feel in real life) so to stay fast, you need to stay above the 4k rpm, to stay economical, below the 4k mark.

Toyota also uses it, but its called VVTI.

Actually, VTEC controls how far the valves open by using a follower on an extra cam lobe on the camshaft, which allows the valves to open farther at higher RPM (passed around 4500RPM mark, sometimes farther).

 

[Mister E]

Actually, VTEC controls how long the valves stay open by using a follower on an extra cam lobe on the camshaft, which allows the valves to open farther at higher RPM (passed around 4500RPM mark, sometimes farther).

I was just about to point this out... It would be pretty nasty if just two valves opened like he said.

 

[Silvia95]

Nissan has VVT too but I wonder if the 350Z has it? The non supercharged Toyota MR2, the first gen ones, had something called T-Vis. I wonder if you can feel that in GT4 too?

 

[Gabkicks]

i dont think it would be too hard to get the cams to kick in at correct times.

hm.. that makes me question if they will allow for the modification of the Vtec system in cars so all cams are running high all the time, probably not.. i wonder if Forza will have it, since they have engine swaps in that.

 

[Flip rSx driveR]

i dont think it would be too hard to get the cams to kick in at correct times.

hm.. that makes me question if they will allow for the modification of the Vtec system in cars so all cams are running all the time, probably not.. i wonder if Forza will have it, since they have engine swaps in that.

Well, think about it. If you have a valve opened really far, even at low RPM... what kind of gas mileage do you think you'd be getting.

 

[Gabkicks]

yeah, but lots of tuners do it.

 

[Flip rSx driveR]

Well, activating the VTEC at too low of an RPM can cause lower the low-end responsiveness of the engine because the VTEC cam lobe has too high of a profile. The " tuners " would probably lower the VTEC crossover a little bit, but never have it running all the time.

 

[Daddybird]

Actually, VTEC controls how far the valves open by using a follower on an extra cam lobe on the camshaft, which allows the valves to open farther at higher RPM (passed around 4500RPM mark, sometimes farther).

Yeah you're right, but in basic terms its like above the 4-4,5 mark its running on 4 valves and below the mark (almost) on 2.

 

[Civicbus]

Yeah you're right, but in basic terms its like above the 4-4,5 mark its running on 4 valves and below the mark (almost) on 2.

actually, the motors ALWAYS run on 4 valves. The cams only control how much lift/duration the valves put out, not how many operate. And the general rule of thumb for VTEC is 2000RPMS less than the redline. ie: My civic goes to 7 so it would kick in around 5

 

[Daddybird]

Me myself own a V-Tec (400cc) and you can really feel a kick ones the 8000 mark has been passed.....I always thought the other two valves (not really 'start' to open en close) came in. Went to fload.

 

[Civicbus]

Well, activating the VTEC at too low of an RPM can cause lower the low-end responsiveness of the engine because the VTEC cam lobe has too high of a profile. The " tuners " would probably lower the VTEC crossover a little bit, but never have it running all the time.

yep, that's all very true and very sad for the "tuners" that lower their VTEC without changing anything else. I'll bet dollars to donuts they change it soo much that they lose a chunk of their powerband. I remember hearing some "tuners" tell me they changed their crossover to 3-4 grand.... hahahaha

 

[tha_con]

Well, activating the VTEC at too low of an RPM can cause lower the low-end responsiveness of the engine because the VTEC cam lobe has too high of a profile. The " tuners " would probably lower the VTEC crossover a little bit, but never have it running all the time.

There actually is an ITR that for the most part is in "VTEC" all the time. Basically it just runs on that high end cam profile all the time. The low end powerband sucks donkey balls, but the top end was monster, I'd have to find the video again...god the header on that thing was nuts, lol...looked bizzare.

 

[Civicbus]

Me myself own a V-Tec (400cc) and you can really feel a kick ones the 8000 mark has been passed.....I always thought the other two valves (not really 'start' to open en close) came in. Went to fload.

just curious, what are you riding?
well, there could perhaps be another system in there that "shuts off" one intake and one exhaust valve but that's not related to VTEC.

 

[Daddybird]

Honda VFR400R, uses a similar to Vtec system (more suited for racing engines, really the same as the MOTOGP bikes).

 

[j8mie]

There are several versions of Variable Valve Timing and Lift Electronic Control (VTEC).
DOHC VTEC - Intake and exhaust valves change profile.
VTEC - intake valves change profile
VTEC-E - one intake valve closes at low rpm, to improve fuel econ.
3stage VTEC - all of the above in one

I believe the version used on motorbikes is different still.

The VTEC you got on UKDM and JDM's (Integra's) will start working at 5600rpm, but you won't feel the kick until 5800rpm, which I've never noticed in GT3 or GTP. You need to listen to the engine to know when the VTEC kicks in.

Nissan has VVT too but I wonder if the 350Z has it? The non supercharged Toyota MR2, the first gen ones, had something called T-Vis. I wonder if you can feel that in GT4 too?

Toyota Variable Intake System (T-Vis) on Toyota's is a bit different. It allows accelerated air flow at low speed to the manifold. The theory was quite simple, a butterfly valve was added. At below 4,650 rpm the butterfly valve would be closed so that raising the velocity of air in the manifold. As a result, better mixing could be obtained at the manifold. It does not effect how far/the number of valves opening, and you'd never notice it during gameplaying, just like you wouldn't notice it in real life.

Cheers, Jamie

 

[Civicbus]

Honda VFR400R, uses a similar to Vtec system (more suited for racing engines, really the same as the MOTOGP bikes).

sweet, oldschool 👍 I wanna get my grubby hands on a CBR600RR

 

[Flip rSx driveR]

Well said j8mie. 👍

 

[Gabkicks]

hmm.. that reminds me, wasnt there a "Vtechless" Vtec on that vtec magic episode of best motoring? u know, with the high cams all the time? i think it was a the Jun prelude or something. It seemed to have plenty of power in the lower revs..

 

[CrackHoor]

u know, with the high cams all the time?

That would make sense from a racing standpoint - custom single lobe cams designed for high-RPM power. Who drives a racecar at 3000RPM?

 

[Gabkicks]

lol, im just saying what i saw right before my eyes.

 

[draven6801]

Vtec is a pretty impresive thing
I my self own a mildly modified 90 integra with LS/vtec
and I have civic type r cams. But when vtec kicks at 5500rpm
in 1st gear it will break traction and spin the front wheels to redline.

 

[AMV8]

Vtec is a pretty impresive thing
I my self own a mildly modified 90 integra with LS/vtec
and I have civic type r cams. But when vtec kicks at 5500rpm
in 1st gear it will break traction and spin the front wheels to redline.

I agree, VTEC is impressive technology. I remember feeling it kick in my old Integra GS-R.

Forms of variable valve timing are used in other cars as well. The M3 uses what it calls Double-Vanos, a form of valve manipulation, however it is used throughout the entire powerband, giving that push from the moment you step on the gas. And WOW, what an incredible feeling being pushed back in your seat like that. It's beyond words.