do 1.98 roller rockers acheive good results with stock exhaust

[V85000i]

i've got a VY exec, and want to keep it pretty much stock as a rock, except i want it to have a little bit more go, so was wondering if i fit 1.98 roller rockers, plenum spacer, 70mm T/B and K&N filter, will these all have an affect with the stock exhaust still fitted or will it be wasted money? cheers.

[wraith]

Better off spending the money on a better exhaust first.

[Dr HaxZaw]

you want to get the engine breathing first... best way to increase the flow is to start at the exhaust and then work from the intake into the engine

[V85000i]

yea but i don't want it loud, i want it to stay quiet

[woteva]

You can get it quiet if you like it that way. Have a talk with your local exhaust shop, they should have a solution.

[V85000i]

i got some good advice on the street commos forum, apparently a stock SS system will be nice and quiet and flow easily well enough

[wraith]

There is bugger all difference between the both.

[Not_An_Abba_Fan]

The stock SS system on the VP was the same as standard 5.0L. As far as I'm aware, the SS wasn't IRS, yours being a Calais is IRS correct?

They are probably talking the stock SS system of the VT2 on with the LS1 engine. This system will not bolt straight on to a VP, a lot of modifcation is required.

If you want good gains, extractors, high flow cat and a 2 1/2" system with the rear resonator will flow very well and give you a significant improvement. $1100 shipped for all of that to fit the IRS VP.

[SuperSixty6]

The guy is talking about a Vy Exec ? Being Ecotec, Going by list of mods etc...

In which case yes you could through an SS exhaust on, Which will flow fine (Although your not going to see any gains here with a V6), But you will need the L67 exhaust outlets...

[VSSECO]

i've got a VY exec, and want to keep it pretty much stock as a rock, except i want it to have a little bit more go, so was wondering if i fit 1.98 roller rockers, plenum spacer, 70mm T/B and K&N filter, will these all have an affect with the stock exhaust still fitted or will it be wasted money? cheers.

Forget about the T/B because you dont need a bigger one yet and put the extra money into getting a proper set of roller rockers - the 1.95's from yella terra. Forget the 1.98 flat tipped ones. Yes you will notice an improvement straight away, it will be an improvement right across the rev range and the engine will rev out a lot smoother than standard (ignore last comment if you get the flat tipped "rollers"). Even without changing the exhaust this is a great mod, but exhaust mods would be recomended.
If you want it quiet you can put extractors on it and leave the rest as is for now, but you will probably want more power after that.
Definately yes to the K&N filter, everyone should have one in my book. And the plenum spacer is your call. Wont make power but can prevent some power loss in city driving conditions where you sit at a lot of lights.

After the many many thousands I have spent on V6 development I can say with absolute confidence that the two best things I have ever bought my various V6's have been extractors and high ratio rockers. Most good mods will make some kind of difference on a standard engine but nothing can compare to these two in terms of instant noticable actual improvement.

So many of the V6 "performance" parts out there are very gimmicy because there is a huge teenage market with buicks and ecotecs that want to believe that their first car is a racecar, so businesses love to take advantage of that. But these two things will have your car driving like standard and it will have about 10-20% more power across the rev range.

You might also note that proper rollers and extractors are two of the most expensive parts you can buy for a standard engine - you DO get what you pay for

[westerlybreeze]

i've got a VY exec, and want to keep it pretty much stock as a rock, except i want it to have a little bit more go, so was wondering if i fit 1.98 roller rockers, plenum spacer, 70mm T/B and K&N filter, will these all have an affect with the stock exhaust still fitted or will it be wasted money? cheers.

1st Suspension improvements.
1st b a good service.
1st c I'd go manifold and plenum spacers. (less heat in the inlet manifold, longer intake runners improve low rpm torque and plenum spacer improves distribution between the cylinders=more torque).
2nd a CAI. *Note if you have a MAF sensor - the oil from the likes of a pre-oiled K&N will reduce it's sensitivity and your motor will run lean, so use a non-oiled air filter.
3rd Headers/extractors.
4th Exhaust.
5th Change diff ratio?
6th High ratio rockers? (roller/non-roller tip. Roller tip just less side loading on the valve).
6th a or a cam (with retune).
7th Larger Throttlebody with a retune to suit.

My 2cents

[vxcalais_01]

yea but i don't want it loud, i want it to stay quiet

Years ago when i got mine fitted, the guy seen my baby seat and said he wont fit a straight through as it affects the kids teething, so he fitted a double baffle muffler etc etc. 2 kids later and they sleep, low drone, doesn't bother them, but is really loud from the outside. Who knows though, it probably sounds crap to someone, but i like it and never had any poor feedback.

[one_and_only2004]

Extractors, manifold spacer and roller rockers = job done. Stock exhaust is fine.
The manifold spacer moves your torque band down lower - it doesn't gain anything, that's why I suggest it with the extractors as they free everything up and tend to move the power up higher in the rev range. Rockers are good all over the rev range, but they're more noticeable up high.

[Not_An_Abba_Fan]

I must put my reading glasses on.....only saw the ride in the corner, don't know how I missed the "I've got a VY exec".......

If you want to change anything on the exhaust side of things let me know and I'll price it up for you.

[immortality]

"Bang for buck" high ratio rockers will give greater gains then any other "bolt on" mod on the market (excluding things such as Nitrous and forced inductions). On the VY you can't use the 1.98 rockers because Holden got very slack with there cast maintenance which resulted on a lot a "casting flashes" in the push rod holes in the heads which when combined with 1.98 high ratio rockers causes the push rods to rub on said casting flashes.

On VY models don't use rockers with a greater ratio then 1.9 unless you clean up the casting flashes first (which can be a pain in the ass unless you remove the heads first).

The manifold insulators work well on the ecotec, improved torque right through the rev range. I can't see a down side to that.

cheers

[luke23]

Years ago when i got mine fitted, the guy seen my baby seat and said he wont fit a straight through as it affects the kids teething, so he fitted a double baffle muffler etc etc. 2 kids later and they sleep, low drone, doesn't bother them, but is really loud from the outside. Who knows though, it probably sounds crap to someone, but i like it and never had any poor feedback.

how could an exhaust effect a childs teething? did he explain more into detail about it? has anyone else heard of this?and mabey he said "hearing" not "teething"