there are no good boosted Vtecs

[MRJDM]

im came across this on the web anyone agree with this.


"Normally aspirated cams, especially high RPM oriented such as DOHC
VTEC's have longer duration and overlap. when you use force induction,
you don't need all this duration and overlap... a properly engineering
VTEC cam for turbo applications would offer KILLER torque curve and
power."

Overlap is used as a way of exiting exhaust gases to actually suck in
the intake charge. This is partly what VTEC does, kind of a wanna be
turbocharger. So imagine if you have a lot of overlap on a turbo.
Under boost, the compressed air would blow right through the cylinder.
You wouldn't get all that quality compressed air to stay in the cylinder!

This is why B18A/B motors respond so well to turbocharging with
cam sprockets and JG Engine Dynamics #1001 camshafts. The camshafts
are used to maintain peak cylinder pressure and sprockets dial it all in.
The turbocharger can cram all of it's boost into the cylinder.

So far no one has good turbo VTEC cams. It is questionable whether
or not sprockets can dial enough overlap out to use 100% of the turbocharger's
output.

VTEC motors do respond well to turbocharging, but there's still a lot of room
for improvement.

[CAT_SPEW]

I didn't read all of it, but the part that I did read was about the valve overlap. And I think that if you are running high boost with a DOHC VTEC engine, then you are better off to put in "KILLER VTEC" cams which gets rid of the overlap, giving you more power etc.

I think that's it?



Matt.

[A'PEXi]

theres a guy with a h22a twin turbo around here :D

[2ds]

vtec is NOT a wannabe turbo charger, it is better valve actuation, it can be used in a complimentary fashion to a turbo charger.

killer vtec cams are just cams for vtec engines that have no mild lobe in them. they are only usefull for track or drag.

as for the "there are no good boosted vtecs" statement blkcrx has 300kws @ the wheels that say otherwise =p

-2ds

[VTEC16]

vtec is NOT a wannabe turbo charger, it is better valve actuation, it can be used in a complimentary fashion to a turbo charger.

killer vtec cams are just cams for vtec engines that have no mild lobe in them. they are only usefull for track or drag.

as for the "there are no good boosted vtecs" statement blkcrx has 300kws @ the wheels that say otherwise =p

-2ds

W3RD!

wots with all these lost kunts?? :roll:

[Weq]

theres a guy with a h22a twin turbo around here :D

just cuase something is twin, doesnt mean its 'faster'.

[2ds]

theres a guy with a h22a twin turbo around here :D

just cuase something is twin, doesnt mean its 'faster'.

sounds more like a miracle of engineering to fit all that crap under the bonnet!!

-2ds

[CJL]

^ i reckon, bah to twin turbo just get one phat turbo :P

[pornstar]

i like da twin turbs bro, its nice, and different :)

[VTEC16]

i like da twin turbs bro, its nice, and different :)

you like it cause it sounds good.

So many noobs (honestly not even remotely aimed at you pornstar) talk about twin turbo this and twin turbo that.....but most of the fastest GTRs have a single turbo conversion anyway!

[Weq]

i defaintly think twins on that h22a where definatly for bling factor..
the manifold would be crazy, esically fitting into an EG body.

their is a twin turbo d16 and ive seen a twins b18 also.

[2ds]

i like da twin turbs bro, its nice, and different :)

lol, you ricer ;)

oooh i have to give you a call, sorry i've been busy. i'll call you on monday =D

-2ds

[WPN.22R]

A'PEXi wrote:
theres a guy with a h22a twin turbo around here




theres also a guy with a h22a with a t4 on it!!!! ;) 8)

[A'PEXi]

theres a guy with a h22a twin turbo around here :D

just cuase something is twin, doesnt mean its 'faster'.

i purely replied to 'there are no good boosted vtecs'.... i did not mention whether it was fast or not, the fact that the guy did most of the work himself, i think deserves some respect.

[A'PEXi]

its a eg civic btw.

[BLKCRX]

Yeah turbo and vtec does't work.. thats why my car and so many others are soo slow ! :)

Regards James

[joyride]

type R turbos are fast.

[one more chance]

in response to the TTH22A EG civic..
it's a tough set-up and i have driven it first hand....but the truth is that there are 2 WRX turbos running off a 2.2L engine! even at 19psi, the engine is not making enough power to get the turbo working at their full efficiency! great work of engineering though! The welding work in particular is spectacular! 8)

[saboteur]

The guy that built it was an engineer, so I'm guessing that since it was his own ride he put a hell of a lot of time into that thing. Has it got stock internals?

[TODA AU]

im came across this on the web anyone agree with this.


"Normally aspirated cams, especially high RPM oriented such as [acronym:0bda72b9d5="Double Overhead Cam"]DOHC[/acronym:0bda72b9d5]
[acronym:0bda72b9d5="Valve Timing and lift Electronic Control"]VTEC[/acronym:0bda72b9d5]'s have longer duration and overlap. when you use force induction,
you don't need all this duration and overlap... a properly engineering
[acronym:0bda72b9d5="Valve Timing and lift Electronic Control"]VTEC[/acronym:0bda72b9d5] cam for turbo applications would offer KILLER torque curve and
power."

Overlap is used as a way of exiting exhaust gases to actually suck in
the intake charge. This is partly what [acronym:0bda72b9d5="Valve Timing and lift Electronic Control"]VTEC[/acronym:0bda72b9d5] does, kind of a wanna be
turbocharger. So imagine if you have a lot of overlap on a turbo.
Under boost, the compressed air would blow right through the cylinder.
You wouldn't get all that quality compressed air to stay in the cylinder!

This is why B18A/B motors respond so well to turbocharging with
cam sprockets and JG Engine Dynamics #1001 camshafts. The camshafts
are used to maintain peak cylinder pressure and sprockets dial it all in.
The turbocharger can cram all of it's boost into the cylinder.

So far no one has good turbo [acronym:0bda72b9d5="Valve Timing and lift Electronic Control"]VTEC[/acronym:0bda72b9d5] cams. It is questionable whether
or not sprockets can dial enough overlap out to use 100% of the turbocharger's
output.

[acronym:0bda72b9d5="Valve Timing and lift Electronic Control"]VTEC[/acronym:0bda72b9d5] motors do respond well to turbocharging, but there's still a lot of room
for improvement.

No... (Disagree)
That statement is complete nonsense...
Zero overlap turbo systems are a thing of the past...