Outer Limits 4x4 Board

I've got a 1.6 efi vit. Its got genie tri-Y extractors (really motavators but same diff), a round small body metal cat (2"in/2"out), a resonator and a lukey ultraflow muffler, all with 2" pipe. Initially it did not have the resonator between the cat and muffler and while it sounded teh bom in the driveway or wheeling out bush it was a PITA to drive on the highway. It was waaaay too loud at 2k to 3.5k rpm right where you cruise at and left your ears ringing at the end of a trip (and was probably illegal too). On wifes orders I went back and had the resonator fitted to settle it down. Still has a nice note at idle and wot but is more subtle at crusing revs.
I paid $650 fitted (not including the extractors which were already on) at a carline shop.

The stainless pipe you have would sound nice with a s/s muffler (s/s glasspack, mmm) but i predict that it will sound too flatulent without some kind of resonator. And shell out for a cat like i have, the environment will thank you and it won't effect performance at all (X2 if you get the pipe you have press bent). Is the pipe you have the correct thickness for an exhaust. Too thin and your going to bash the hell out of it offroad. Too thick will just add weight. Also why use all those prefab bends. aren't all the weld seems going to add tubulence?

Dont get a tip! It looks wank. Use the cash saved to have the system bent and hung by an installer, you will gain some extra clearance.

As far a power goes from my 1.6 efi I don't know if i have increased peak power at all but may have flattened the power and/or torque curves to produce a little more at lower revs (which is what i understand tri-y does as opposed to 4-1's). I seem to get up hills on the way to my wheeling spots with less throttle and holding higher speed but those kinds of observations tend to be highly subjective (ie sounds louder = more power???)

Edit: just read your later posts I'm very happy with this
http://www.lukey.com.au/default.asp?pag ... ENT&sid=63
But as said I had to get the resonator as well

I'd call that a resonator rather than a muffler.

A resonator will "tune" the sound but won't necessarily make the car much quieter. You would use this in the place of a hot dog, but it's just harder to fit.

Get some recommendations for good exhaust shops in your area and let them sort out what configuration to parts are required. They do it for a living and want you to be happy.

Tell them you want a legally loud 2" exhaust with a nice note. They'll just sort it out for you. Don't bother with trying to supply them with a collection of parts - when it drones at 60 km/h and sounds crap they won't want to know you.

Steve.

Gwagensteve wrote:I'd call that a resonator rather than a muffler.

A resonator will "tune" the sound but won't necessarily make the car much quieter. You would use this in the place of a hot dog, but it's just harder to fit.

Don't know the reasons behind why but mine definatly did by a significant amount (as best I can tell without a sound meter). It may have made a diff that it was put in front of the muffler?

Thanks For help guys

2" stainless pipe running from converter onto muffler a decent one ill get will do me fine, stuff the tip... as u's said will be in way. then maybe later on ill get extractors..

skez wrote:to big of an exhaust will have zero back pressure well thats my theory anyway,

Your theory is flawed, I dunno who created this "back pressure" story but it's a crock, gas velocity and cylinder scavenging is what you want to maintain. To big of an exhaust will kill velocity and scavenging and only show gains in the top end and losses in low end torque too small however will restrict power and torque all together. I have spoken about zorst tech in a thread that I think Christo started recently and it has some good info.

IMHO stock sierra a press bent 1.75" straight through system with 2 inch cat (or 2 inch high flow) or 2 a full inch turbo muffler system would give best power and torque and be cheap too The larger turbo muffler system will prolly sound better overall but I have a 2inch straight through on my GTi motor and it sound ShortyIQ tuff but would annoy the shiznit out of a normal sane person and it's my quiter daily car

Gwagensteve wrote:A 2" exhaust with no muffler at all will be nothing but a PITA.

The noise is going to drive you insane.

With any luck you'll get a defect notice and have to do it properly.

Take it to an exhaust shop. you can get a pretty sweet note out of a sierra, with a cat and a muffler, nice and legal.

If it's a soft-top, you'll want a bit of muffler anyway - they get pretty loud with the top down.

The last car I did has extractors, cat, one offset straight through muffler and a 12" hot dog will give a nice quiet cruise, be nice and legal, but still have a bit of a rip when you're on it.

Steve.

i find mine alot louder with the roof on, its almost silent with it off, im running a 2" with sports muffler.


me217

whats the point of a 2inch zorst on a 1.3 ...sweet note roflmao buy a 350 chev and zorst that ...i would think the object of spending the bucks to put a bigger zorst on a 1.3 would be in the attempt to gain some ponies.....having said that basic theory would apply here to get more out you need to get more in and through therefore a bigger zorst without putting a bigger carb/throttle body on at least and at the optimum flowing the head with a good port and polish and some bigger valves and a cam to drive em is in my opinion nothing but a waste of bucks, find the optimal flow for your stock 1.3 and stick to the pipe size that suits .......it will at least when tuned right go the best it can
better still do what the ricers do put your 2 inch on i have a cheap garbage can here bring your rig round we will weld it on the back for a tip it will go like shite but all the boys will look as you crawl past at 7500 rpm at 25ks and 129db

the main reason i put a new exhaust on mine was the 1.3 exhaust was to restricting for the 1.6 and the old exhaust leaked worse then my original roof. and every time i drove it i almost died for co poisoning. lol also it sounded really bad lol.

me217

zoook wrote:whats the point of a 2inch zorst on a 1.3 ...sweet note roflmao buy a 350 chev and zorst that ...i would think the object of spending the bucks to put a bigger zorst on a 1.3 would be in the attempt to gain some ponies.....having said that basic theory would apply here to get more out you need to get more in and through therefore a bigger zorst without putting a bigger carb/throttle body on at least and at the optimum flowing the head with a good port and polish and some bigger valves and a cam to drive em is in my opinion nothing but a waste of bucks, find the optimal flow for your stock 1.3 and stick to the pipe size that suits .......it will at least when tuned right go the best it can
better still do what the ricers do put your 2 inch on i have a cheap garbage can here bring your rig round we will weld it on the back for a tip it will go like shite but all the boys will look as you crawl past at 7500 rpm at 25ks and 129db

right.... so putting 2" pipe from extractors to cat converter to oval muffler is gonna affect the performance that much dout it... id say more power to hold a certain rev.... up a hill

Nope, you'll generally convince yourself it's going better because it's making more noise but the power gains will be very minimal.

Steve.

Gwagensteve wrote:Nope, you'll generally convince yourself it's going better because it's making more noise but the power gains will be very minimal.

Steve.

What about the old "seat of the pants dyno", accurate to +/- 2hp

GRPABT1 wrote:

skez wrote:to big of an exhaust will have zero back pressure well thats my theory anyway,

gas velocity and cylinder scavenging is what you want to maintain.

thats wat i meant the by back pressure (dont no the exact words for it tho) and scavenging probably similar to a 2stroke race engine with that big fat pipe that goes to a small tip because it puts some of the wasted fuel back in that tries to go out the exhaust because they dont have vaves, if u no wat i mean ,
i dont no im probabbly wrong but anyway

putting an exhaust on wont make the 1.3 a ball tearer to drive. but then
again why would people bother with them if they dont make a difference?

because noise = horsepower

Steve.

I think there are meaningful gains to be had in EFI cars that run closed loop and on carby cars that are tuned to suit, but on an otherwise stock carby motor there's going to be negligable effect.

Steve.

yeh all for the sound just like putting mags spoilers etc on are just for looks do nothing and i have seen a stock 3 cylinder charade with a straight threw exhaust slow as shit but i yeh sounds loud and fast lol

This with full exhaust system and extractors this would do something right? lol

http://cgi.ebay.com.au/Weber-conversion ... 286.c0.m14

Brent, from the sounds of things you need to sell your Zook and buy a ricer, champ.

Sierra's are slow. Period. Short of an engine conversion or super/turbocharging ($$$), it's always going to be slow. Yeah adding a Weber will help, but then you've got to sort out how you connect it to a snorkel (or live with a pod filter and not being able to do water crossings) and Weber's also hate slopes - without modification, they'll die on steep ascents / descents. Plus the extra fuel they'll use.

IMO live with it being slow on road, but mod it so you can laugh at everyone else off road. That's where the Zook is made to shine.

Xboggedytrillion.

a weber is going to be a PITA. There's a reason the weber thread is 15 pages long.

Steve.

put some boggers or centipedes on it - they sounds better on the road than a struggling squirrel breathing through a pipe anyday.

Moph wrote:Brent, from the sounds of things you need to sell your Zook and buy a ricer, champ.

Sierra's are slow. Period. Short of an engine conversion or super/turbocharging ($$$), it's always going to be slow. Yeah adding a Weber will help, but then you've got to sort out how you connect it to a snorkel (or live with a pod filter and not being able to do water crossings) and Weber's also hate slopes - without modification, they'll die on steep ascents / descents. Plus the extra fuel they'll use.

IMO live with it being slow on road, but mod it so you can laugh at everyone else off road. That's where the Zook is made to shine.

Haha yer i've learnt that they are slow as fk on road xD i had mine out today in 40 Knot winds omfg getting blowen around lyk a rag doll and even a semi over taking me LOL

But yer im just gonna mod it as 4wd only vehicle then later on buy a commodore to do my highway driving i'll focus on gearing after i get suspension lift. Was just asking bout that webber i have no idea about them.

Even atm my Zuk goes wher alot of modified 4wd's carnt go

Cheers Brent.

hey sorry for the post in someone elses thread. but i saw someone posted the extractors from ebay up here. there is an item for a Vitara but it say it fits the G16A engine. my question is short and simple hopefully.
will this set of extractors fit to a G16B engine or will i have bolting problems?
thanks

G16A generally refers to 8V carby
G16B generally refers to 16V EFI

Carby 8V and EFI 16V heads are different and the extractors are not interchangeable.

EFI - round ports
Carby - rectangular ports.

(and the bolt pattern is different)

Steve.

bugger
thats what i didnt want to hear..... but thanks anyway Gwagensteve