VCT vs I6

brad` · 16-08-2011, 10:02 PM

ok so simply is it worth putting a VCT in or just leaving the I6 in, just woundering thats all, i heard the VCT is a good motor but thats about all i heard, also heard u can upgraded them internally to much

Day-mow · 16-08-2011, 10:24 PM

stick with the I6 man. easier for cam up grades.

XRGhia · 16-08-2011, 10:27 PM

Yeah, as Damo said, Cam choice is limited with the VCT engine...

I'm not looking forward to finding a decent cam for the EF when the time comes (Now runs an AU 4L VCT engine)...

phillyc · 16-08-2011, 10:31 PM

You can get good cams from Crescent Motorsport for the VCT.

I played around with the VCT when using Sniper Tuning in a dyno session. It definitely has it's worth, even with a stock camshaft.

Day-mow · 17-08-2011, 12:14 AM

Quote:

Originally Posted by phillyc

You can get good cams from Crescent Motorsport for the VCT.

I played around with the VCT when using Sniper Tuning in a dyno session. It definitely has it's worth, even with a stock camshaft.

this is quite true.
contemplating getting a cam from Joe @ CMS.and will be tuning it soon hopefully.

however many other cam manufacture's run when you say VCT SOHC

**SSD-85** · 17-08-2011, 12:52 AM

IMO upgrade the I6 or drop a V8 in.

Thats just based on my own experience with the VCT engine.

Mr Hardware · 17-08-2011, 11:32 AM

The only thing you can 'upgrade' by going to the VCT motor is to 'upgrade' how much profit the guy at the servo makes this month.
VCT: power of a 6, economy of an 8.

smoo · 17-08-2011, 05:35 PM

To be fair Mr Hardware, back when the AU was new the VCT (aswell as the standard I6) made the 5.0 Holden and Ford and just about every other 6 cylinder/V6 on ther market look very lame. 175 kw SS and XR8 and 172kw XR6 and about 30odd nm short of the V8s with low 8l/100km fuel economy, can't complain myself. Pretty sure the base model V8s back then had 165kw too.

**SSD-85** · 18-08-2011, 01:11 PM

Quote:

Originally Posted by smoo

To be fair Mr Hardware, back when the AU was new the VCT (aswell as the standard I6) made the 5.0 Holden and Ford and just about every other 6 cylinder/V6 on ther market look very lame. 175 kw SS and XR8 and 172kw XR6 and about 30odd nm short of the V8s with low 8l/100km fuel economy, can't complain myself. Pretty sure the base model V8s back then had 165kw too.

The EL Update & AU XR8s were 185kw and absolutely embarrassed the SS, even the Clubsport. Base model V8 AUs were 175kw.

Even the XR6HP beat the VCT XR6 due to weight differences. The VCT made absolutely no sense, except saving a couple of dollars come rego renewal. A saving easily lost at the bowser.

Mr Hardware is right on the money; AU VCT = Power of a 6, Economy of an 8.

As you can tell, I dont like them much. And after owning one, its justified. XR6HP/XR8 FTW.

mik · 18-08-2011, 01:15 PM

dunno if its worth the extra kw, that said , the vct are certainly no slouch.

smoo · 18-08-2011, 08:26 PM

Quote:

Originally Posted by Scotty85

The EL Update & AU XR8s were 185kw and absolutely embarrassed the SS, even the Clubsport. Base model V8 AUs were 175kw.

Even the XR6HP beat the VCT XR6 due to weight differences. The VCT made absolutely no sense, except saving a couple of dollars come rego renewal. A saving easily lost at the bowser.

Mr Hardware is right on the money; AU VCT = Power of a 6, Economy of an 8.

As you can tell, I dont like them much. And after owning one, its justified. XR6HP/XR8 FTW.

If ya say so, saying a AU XR8 beat the VT1 SS is like comparing a snail to a sloth. 0.5l/100km is hardly a huge difference between VCT and standard I6 (I've owned both). And I challenge ya to get that sort of gas mileage from an underpowered wheezer 5.0 (which struggled to make more power and torque than the VCT, as you point out). From my experience the only V8 that will give the similar fuel economy to the VCT was my old 300hp 540i BMW, 8.5l/100km, against my old Fairlanes 8-8.5. Good luck doing that in any wheezer or Holden cast iron lump.

Cadge · 19-08-2011, 11:31 AM

What models did the VCT come out with? I dropped an XR6 engine into my fairmont, but would have not idea if it was an I6 or VCT... am i correct in assuming the VCT had VCT on the top and I6 had nothing (appart from being red)

SlipKnoT · 19-08-2011, 03:53 PM

the vct also had a red rocker cover but it had vct intech written on it and like silver lines on top

zakjames · 19-08-2011, 04:35 PM

Why does the VCT use up so much more fuel if what you guys is saying is true?

I could only imagine it would be more economic due to the variable cams.
I am yet to drive a I6 HP engine but im very happy with my VCT now.

What sort of L/100Km do both engines run roughly?

2002au · 19-08-2011, 04:48 PM

Quote:

Originally Posted by zakjames

What sort of L/100Km do both engines run roughly?

my non-vct xr6 uses 8.6 L/100km. also its a manual

smoo · 19-08-2011, 06:03 PM

Quote:

Originally Posted by zakjames

Why does the VCT use up so much more fuel if what you guys is saying is true?

I could only imagine it would be more economic due to the variable cams.
I am yet to drive a I6 HP engine but im very happy with my VCT now.

What sort of L/100Km do both engines run roughly?

All my driving is highway, my past AUs would consistently get...

AU Futura 7.6l/100km
2nd Futura, 7.9l/100m
Fairlane VCT, 8l/100km
Fairmont wagon, 9.6-10l/100km
XR6 manual ute VCT, 8.5l/100km

I think the ute and wagon shapes may effect fuel consumption (?).
Buggered if I know where the VCT 'power of a 6 economy of an 8' comes from.
If anything the 5.0 V8s have the power of a 6 and economy of an XJS Jag. The fact both sound so good and have huge aftermarket support saves their ****.

mik · 19-08-2011, 06:03 PM

vct equipped models also had the heavier irs , there`s probably not much in it , living in the burbs of good old melbourne, mostly stop start driving, i`ve had it as low as 350 k`s to the tank on rare occasions, the usual for me is 400/450 k`s to the tank per week , driving with economy in mind 500 +, highway without much effort 700 plus, i reckon that`s pretty reasonable, i`m happy with it anyway.

zakjames · 19-08-2011, 06:28 PM

Hmmmmm on average im getting just over 10L/100km usually about 11L. Mostly highway driving - O2 sensor?

Day-mow · 20-08-2011, 10:40 AM

Quote:

Originally Posted by zakjames

Hmmmmm on average im getting just over 10L/100km usually about 11L. Mostly highway driving - O2 sensor?

yeah thats pretty high for hwy driving. give o2 sensor a go

XR_6falcon · 20-08-2011, 04:10 PM

you guys are getting good figures, i get 350 to a tank driving like an old person :(

XR6SQ · 20-08-2011, 04:20 PM

I got over 800kms out of my ute mostly on the highway a few weeks ago. They deffinately do not like driving in the city though.

mik · 21-08-2011, 12:55 PM

a lot of the economy is in the treatment of the pedal i think, mines a pensioner special so most of the time it`s driven gently, only rare occasions the horns comes out

RobVee · 21-08-2011, 09:25 PM

my fairlane has the vct i6 and it goes great, a smooth ride and more than enough power if needed
in terms of econmy it is usully round the 400-450 km per tank in south east melbourne suburbs commuting day to day. out on the open road i have got it well over 650 km before i felt like topping up.

dieseltrain79 · 21-08-2011, 09:40 PM

Ive had my VCT Fairmont Ghia for 2.5 years . Bought it with 128k and now has 156k on it . It gets some highway work , and mostly short trips round town .

It has averaged 13.9L/100km in this time of usage .

Not bad for a car that has always had 1 child seat ( now 2 ) and is just stock as a rock . Keeps the wife happy , and has loads of room as well as all the options .

If she wants a taste of speed, Soarer it is , otherwise slushbox is nice to drive .

Jimmyd · 21-08-2011, 10:06 PM

AU 1.5 Fairmont Ghia - urban 13.5l/100klm, Hwy 8l/100klm