Yes, only the inlet cam is different.
I had all 4 fitted but there is no diference in the exhaust cam (at the time, there were a few differing opinions so I took the safe option )
My Cav V6 has....
3.0 Omega cams
Scorpion GrpA exhaust with no middle box
ITG panel filter (I run a cone in the winter)
Airbox is fed by an inlet just below the bumper.
If I can get a decent system sorted I will run the cone throughout the year.... it's that hot air that's the problem though..
On the rollers earlier in the year it put out 204bhp..
I must say, I do fancy getting my hands on a set of 3.0lt inlets.....
204 bhp is very very appealing
I do have one question though, does the 2.5 cams profile mean there is more torque lower down in the rev range? Does getting 3.0lt ones push the majority of the power 4.5k+ ?
The reason I ask is I have an F25 (I think) box, basically really tall gearing, I don't really want to reduce its 55 - 85 pull.
What difference did you notice on a "before" and "after" the CAM change?
Just to confuse the issue I thought that the 2.5 Vectra GSI just had the 3.0 exhaust cams and the 2.6 Vectra GSI had all 4 cams
The 2.6 GSI had lower power, but much higher torque over a wider range.
Found these figures from elsewhere:
The 2.6 Gsi however produces less bhp than the 2.5 at 180bhp compared to 195 on the Gsi but produces more torque 202lb-ft as opposed to the 2.5s 193.1lb-ft.
I have done a few things to mine to get a bit more power out of it:
K&N panel filter
Single cold air feed
Enlarged throttle body
Gas flowed plenum chamber
And now that I have a new job sorted out I will be getting myself a new catback exhaust system, probably a Mongoose, just to be different to most other Vectra owners.
Nope.... still got a huge grin from 3.5k... the torque curve hasn't been shifted up the rev range at all..
There is no downside, it's all benefits...(well, as long as you don't count excessive fuel consumption cause by clicking it into Sports mode and utilising the kickdown at every available opportunity)
Well... The Scorpion came to me for £75 2nd hand..
Bought a complete pair of 3.0 heads for £100, nicked the cams and then sold the heads for £100
Got the cams fitted at the same time as I had the belt done so no extra cost there..
I don't count the air filter in the cost as that is a consumable
Ive got a 2.6 GSi, 178bhp 202 ft.lb as standard, remapped ( HIGHLY RECOMMENDED!) to 191bhp 221ft/lb, with a pipercross Viper ? Dunno what that added (much better)... Any ideas?
But, as for the 2.5, the early GSi's had just the inlet cams changed, on later 2.5 GSi's they changed all four as this helped the torque curve, as the old ones used to bog down really badly, ie pulling out of juctions slowly in 2nd was dangerous...
First and most benificial mod is to sort the breathing out, filter and exhaust can see the SRi/cd/cdx/gls spec engine putting out high 180's bhp after that cams, headwork etc. BUT most importantly in terms of power delivery and "feel" is the flywheel, get a lightened one in, can save between 1.0 and 0.5 sec to 60 and instant response, if you into the traffic light grand prix?! lol
Ive got a 2.6 GSi, 178bhp 202 ft.lb as standard, remapped ( HIGHLY RECOMMENDED!) to 191bhp 221ft/lb, with a pipercross Viper ? Dunno what that added (much better)... Any ideas?
But, as for the 2.5, the early GSi's had just the inlet cams changed, on later 2.5 GSi's they changed all four as this helped the torque curve, as the old ones used to bog down really badly, ie pulling out of juctions slowly in 2nd was dangerous...
First and most benificial mod is to sort the breathing out, filter and exhaust can see the SRi/cd/cdx/gls spec engine putting out high 180's bhp after that cams, headwork etc. BUT most importantly in terms of power delivery and "feel" is the flywheel, get a lightened one in, can save between 1.0 and 0.5 sec to 60 and instant response, if you into the traffic light grand prix?! lol
I have just ordered my Mongoose catback exhaust and will hopefully get it fitted next week and then I would love to get it on a rolling road to see how much it is pushing out
Whats the best to go for?
Cat back from Magnex or from Scorpion?
Im wanting to keep it factory looking and cant get hold of just the centre silencer, 2.5's used Magnex and 2.6's Scorpion. Cant decide which....
I'm want to try fitting the 3,0 cams into the Vectra at first, then see what more to do...
I have had my eye on the supercharger kit from Regal, but it is very expensive and I can't find out if regal lower the compression or the charger just runs with low pressure... 0,25 - 0,30 bar perhaps...
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Vauxhall Owners Forum
4.7M posts
72.7K members
Since 2000
A forum community dedicated to Vauxhall owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, reliability, maintenance, and more!