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[TheBoy]

2 Gs in a 2.5 is beneficial, but nowhere near a 3.0l lump, not even close. I've owned both side by side, albeit briefly as the 2.5 couldn't hack it, and decided to give up.

Agreed 2G's in a 2.6 is beneficial in that it gives you a little better performance higher up the rev range (useful for overtaking!) but as per above, I own a 2.6 with 2x G's and a 3.2 standard and the 3.2 is a far better performer anywhere in the rev range - from pulling away from stationary all the way to the red line.

And at cruising speeds, the 3.0/3.2 just effortlessly take off in a way that a superchipped 2.5 with 2 Gs just couldn't.

Hmmmm.... Andy considers 3.2 Block with 2.6 Heads for his 2.6  ..... Mrs VXL considers Andy's life insurance policy and Pension fund followed by gentle but firm use of sledgehammer!

That's where it went! Tell her that you can have your engine and I won't press charges for the kidnap of Sammy...   ...and keep the frozen peas on hand for the swelling

[VXL V6]

2 Gs in a 2.5 is beneficial, but nowhere near a 3.0l lump, not even close. I've owned both side by side, albeit briefly as the 2.5 couldn't hack it, and decided to give up.

Agreed 2G's in a 2.6 is beneficial in that it gives you a little better performance higher up the rev range (useful for overtaking!) but as per above, I own a 2.6 with 2x G's and a 3.2 standard and the 3.2 is a far better performer anywhere in the rev range - from pulling away from stationary all the way to the red line.

And at cruising speeds, the 3.0/3.2 just effortlessly take off in a way that a superchipped 2.5 with 2 Gs just couldn't.

Hmmmm.... Andy considers 3.2 Block with 2.6 Heads for his 2.6  ..... Mrs VXL considers Andy's life insurance policy and Pension fund followed by gentle but firm use of sledgehammer!

That's where it went! Tell her that you can have your engine and I won't press charges for the kidnap of Sammy...   ...and keep the frozen peas on hand for the swelling

I think there's something she isn't telling me, Next to the Sammy was a pair of pink Crocs and a Fuse in an envelope marked 'Newent 2013'.
 

[PhilCavSRi130]

it will be interesting later this month for me when im doing another rolling road day with my lad and MK3AstraOC. The last one i did i'd fitted sport cats, poweflow exhaust, pipercross air filter and came out with 185.7bhp. The guy running it told me i could attribute most of the power gain to the cats and i left a happy bunny. Since then ive done 4 bar regulator, Magnecor leads, 3.2 plugs, stage 7 motorsport chip, modified throttle body and the car feels much quicker and much more responsive. My reasoning behind the RR day is that i want to know what i'm at now and then do the G cam mod and 2.6/3.2 exhaust manifolds mod then do another RR to see where these will take me to.
Whilst i appreciate the comments regarding going for a 3.0/3.2 over the 2.5 for the power there is the downside that the larger engines in my past experience drink far more. I use mine for commuting to and from work on A and B roads and still return 29-30 to the gallon. When i did the same in the 3.0 i was lucky to see 24-25 and i was doing the same journey driving just the same.

I'll put my rolling road results up when we've been later in the month.

[elvin315]

I've been following the conversation here trying to find bits of info we can apply to our Cadillac Cateras and their 3.0L V6s. Could you tell me how a 3.0 with 2xG is different from one with 4xG? Considering our ECU limits the Catera to a 120 MPH top speed, my goal would be increased acceleration, a quicker ET, more overtaking power. Our ECU cannot be chipped so we have to make HP & Torque the old fashioned way, with bumpy sticks, bigger pots, and more squish.

Marks DTM Calib turned me on to the 3.2L block with 2.5L heads. He said using the G intake cams on the 2.5L head was the way to go. I didn't know about the different cams and now I find you guys talking about 4xG vs. 2G/2A cams. Would a 3.2/2.5 mutt motor like that benefit more from 4xG or 2xG/2xA cams as far as mid-range torque goes?

[elvin315]

"A little knowledge can be a dangerous thing."

I gleaned a little knowledge about camshafts following you guys, made the mistake of digging deeper, and found this:



The chart lists the X30XE's 2x"G" & 2x"A" cams but there's no mention of the 4x"G" option. Forgive my ignorance but does 4x"G" mean using "G" intake camshafts as both intake and exhaust? Try not to laugh at the stupid Yank but I'd rather ask a dumb question now than do something even dumber later.

[zirk]

"A little knowledge can be a dangerous thing."

I gleaned a little knowledge about camshafts following you guys, made the mistake of digging deeper, and found this:



The chart lists the X30XE's 2x"G" & 2x"A" cams but there's no mention of the 4x"G" option. Forgive my ignorance but does 4x"G" mean using "G" intake camshafts as both intake and exhaust? Try not to laugh at the stupid Yank but I'd rather ask a dumb question now than do something even dumber later.

4 x G's Was never an option.

Yes, 4 x G's on Inlet and Exhaust.

Thanks, the pic link can be found here, which is a sticky in OOF Maintenance Guide -

http://www.omegaowners.com/forum/index.php?topic=90500.0

[elvin315]

Thanks Zirk. I've learned a lot over that last few days. Now I've got to convince my cousin the Ace Mechanic to build me a Frankenstein V6 from a 3.2L block with 2.5L heads, 3.0 4x"G" cams, and all the rest. If it happens I'll come back and report. Please be patient, it may take a while.