195 to 260 whats needed?

[hsvvtmanta]

Does anybody know what mods would have to be performed to increase my power from 195 to about 260 and the costs of each mod.Dont really want to stroke unless i have to and i'm not considering a blower or turbo.Also is it possible to piss off the dizzy for a setup like v6 or the gen III engines have or is it to much bulls##t with nothing to gain from such a change?

[-HSV-]

for that amount of power gain you really are going to have to look at stroking, supercharger or even just a redone head and cam work.

i'd be inclined to go down the supercharged path as there are very minor tweaks to be done for even more power down the track.

its up to you really, but the cheaper option will be just to strip down the engine and rebuild it with stronger internals and different cam specs. also, get the head shaved to increase the compression ratio, hence giving more power.

[hsvvtmanta]

If the engine is modified will the computer need reprogramming to suit the modifications.

[essess]

depends how extreme you go with the mods to your engine, bolting a charger/stroker will need a retune. what are you thinking of doing?

[-HSV-]

If the engine is modified will the computer need reprogramming to suit the modifications.for any intake/exhaust mods the standard ECU should be fine and tune itself. it will tune as good as it can and will apparently make the most of your mods although if you want the most power get a decent tune.

for the relearn procedure, go here: http://www.hsvforum.com.au/viewtopic.php?p=1940#1940

[white_lie]

195 to 260 is a huge jump.

You could get there with decent head work, good running gear and a big cam. Might need to bump up the compression a tad though. Being a VT, it will be a roller setup, so it will cost more than pther Holden motors, but should have better street manners compared to a VN-VS 5L.

Definately pointless going with DFI coil packs (or coil on plug) for the cost compared to the advantages of it. Nothing wrong with the old dizzy setup.

[-HSV-]

wat do you mean by street manners whitelie?

[white_lie]

When you run a big cam, you need to also change the torque convertor and diff ratio. Changing to a 4000RPM stall and 3.9:1 in the rear doesn't make for a nice streetable combo. Then add on to this the side effects of a cam with big lift. It will tend to get a big doughy in the lower rev range, which will make you want to rev it out a bit just to get the thing moving. You may also experience problems with the vacuum at low engine speeds. This equates to poor braking and stalling at idle as the TPS doesn't quite know what to do.

With a roller setup though, you can generally run a cam with a lot more lift and not experience any of this.

[-HSV-]

thanks for that whitelie, i see what you mean now.

[GoOsE!!!]

u shouldnt listen to me but i rekon, exhaust, extractors, air filter, cold air intake. that should be a good start, then u could do afewthings to the engine block :)

[white_lie]

Should always start with the basics (cold air, exhaust, diff ratio) as these help the car perform much better and provide a platform for everything else to work off. No point putting a big cam into a motor, only to lose power because the engine can't breath or the exhaust is too restrictive.

[hsvvtmanta]

The car already has extractors leading into a 3inch exhaust which makes it sound real nice,no point in have a v8 if you can't hear it.Also already has cold air intake and thinking about k&n air filter.Looks like some head work and a bigger cam will be the way to go,but not sure if throttle body and injectors will cause any restictions.Don't think dropping diff ratio good idea , the car already sits sideways for first and second and screaches the rears in third.Was looking at the heads you can get from yellow terra and maybe a set of roller rockers , but not sure if there would be much gain for the price.Does anybody know if there heads are better than standard or if roller rockers make much improvement ?.

[-HSV-]

cant you get those yella terra superchargers and increase power and torque to somewhere where you are looking at without doing anything internally? i reckon that would be the way to go...

[GoOsE!!!]

well if you buy everything from here http://www.ssinductions.com.au/ then you will probily get afair differnce with a modded exhaust.

im thinking throttle body and air meter would be abit of a differnce.

[white_lie]

Alloy heads aren't really worth the money unless you're looking at over 500hp.

You can get the cast heads to flow over 520-530hp with a good port job and will be a lot cheaper than the alloy ones. The stock manifolds are good to around 250kW at the flywheel, but after that, they become a bit of a restriction. They're designed for making torque though, so I wouldn't go changing it until its necessary.

[HSV_195]

Hows it going!

well, i also own a car that runs the 195 roller cam 5 litre. Not long ago i inquired about bumping up my power figures, without the assistance of forced induction. for starters the vt 195 had roller cam, so an upgrade of the roller cam in comparison to the regular one was a huge difference.

It was suggested to me that if i was planning on upgrading to the stage 2 yella terra roller cam, i should also do heads>valves and springs>throttle body.... and in addition to that the bloke suggested that if the top end was strengthened, then i should eventually do the crank too! and the entire package that he laid out for me was going to cost in the area of $3000+.
Thats for roughly 200 rwkw. Its big money and long hours to get the work done too. I suggest you go in and see an engine building "specialist" and ask wat u want done, and get a price!

I may perform the above mods, or even a 355 stroker kit sometime along the line, but till then i might dabble in a little bit of NOS action maybe???