Pacemakers

[josh_hartman]

My car is going in for a set of pacemakers on thursday. couldnt afford the competition ones. just got the other type. Has anyone here got them done and does it make much better performance and sound better?

[JC]

Yes, I have them - the 4499s. Definitely makes a difference performance wise, but not sound wise. Mufflers are what dictate sound, not extractors. Extractors just get the exhaust gasses out faster/better.

[sly]

Originally Posted by JC

Yes, I have them - the 4499s. Definitely makes a difference performance wise, but not sound wise. Mufflers are what dictate sound, not extractors. Extractors just get the exhaust gasses out faster/better.

Depends where you're listening from. My AU1 doesn't have the laminated firewall as fitted to the S2 & 3 cars and there is definitely more noise coming into the cabin from the engine bay since I had the Paceys fitted. Must be due to the thinner walls in the welded pipe as opposed to a cast manifold. Anyone who's driven a VN Commode will know what I mean - it was rushed to market with the engine hastily converted from east-west to north-south and the tooling lead time for cast manifolds was too long, so it came out with welded headers which didn't help NVH.

Extractors should also deepen the exhaust note due to the longer primaries giving a lower-frequency harmonic. My car at idle sounds almost like a V8. :

[JC]

Originally Posted by sly

Depends where you're listening from. My AU1 doesn't have the laminated firewall as fitted to the S2 & 3 cars and there is definitely more noise coming into the cabin from the engine bay since I had the Paceys fitted. Must be due to the thinner walls in the welded pipe as opposed to a cast manifold. Anyone who's driven a VN Commode will know what I mean - it was rushed to market with the engine hastily converted from east-west to north-south and the tooling lead time for cast manifolds was too long, so it came out with welded headers which didn't help NVH.

Extractors should also deepen the exhaust note due to the longer primaries giving a lower-frequency harmonic. My car at idle sounds almost like a V8. :

Sorry, but no straight 6 can ever sound anywhere near a V8. As for the rest, you can convince your ears otherwise, but extractors make little to no difference to the note. They can't - they are pipe only - mufflers are what controls the noise levels.

[Bucknaked]

Originally Posted by JC

Sorry, but no straight 6 can ever sound anywhere near a V8.

He's just saying at idle. Mine definatley had a deeper note at idle. Once warm, you could almost mistake it for a V8, unless you owned a V8. Its not until you start to rev it, that it sounded like a 6. I had redback with the resonator removed. Was similar when I did the headers, but a little more of a drone.

I now have the full exhaust, and resonator back on and it sounds more like a 6 now.

[JC]

Originally Posted by Bucknaked

He's just saying at idle. Mine definatley had a deeper note at idle. Once warm, you could almost mistake it for a V8, unless you owned a V8. Its not until you start to rev it, that it sounded like a 6. I had redback with the resonator removed. Was similar when I did the headers, but a little more of a drone.

I now have the full exhaust, and resonator back on and it sounds more like a 6 now.

Unless you have a big cam in the I6 that makes it lope at idle, there is no way it can ever possibly sound like a V8. If you think it does, then you don't know what a V8 sounds like. A V6 could be made to sound similar to a V8, but not an I6.

[stiddy]

Originally Posted by JC

Sorry, but no straight 6 can ever sound anywhere near a V8. As for the rest, you can convince your ears otherwise, but extractors make little to no difference to the note. They can't - they are pipe only - mufflers are what controls the noise levels.

Awww but what about the old 265 hemi 6? they came pretty damn close.
Or the old crossflow 6 with twin 3>1 split headers and twin 2.5in exhaust.. under 3000rpm.
Would almost put your mortage on beting they were 8's :

Mufflers do control noise levels, yes I agree, but extractors DO change the note and CAN sometimes make it a little louder.
They flow alot more than stock exhaust manifolds, more gases coming out at a higher velocity, different shape, length all changes the note and loudness.

[jonbays]

Originally Posted by stiddy

Awww but what about the old 265 hemi 6? they came pretty damn close.
Or the old crossflow 6 with twin 3>1 split headers and twin 2.5in exhaust.. under 3000rpm.
Would almost put your mortage on beting they were 8's :

Mufflers do control noise levels, yes I agree, but extractors DO change the note and CAN sometimes make it a little louder.
They flow alot more than stock exhaust manifolds, more gases coming out at a higher velocity, different shape, length all changes the note and loudness.

100% right

I had a two door hemi pacer that would rev till doomsday and sounded very european burbly and throaty like a M3 and a old XW 221 with extractors and a full twin system with just a rear balance pipe that actually sounded better than most V8's today do. the genIII IV odd firing V8's I mean not the windsor.

Now I white hair, prostate problems and an AURION!

it's very quiet : (

Wife and kids love it. : (

Neigbours even told me they like it. : (

[sly]

Originally Posted by JC

Sorry, but no straight 6 can ever sound anywhere near a V8.

You must have missed the silly smiley at the end of the bait mate!

Anyway, the V8 I had in mind was my uni mate's ZG Fairlane with the strangled 2V 302 and single pipe. It sounded almost like a 6.... :-) <------ SFSF

Seriously, from the passenger's seat it was hard to pick what was upfront. There was no V8 throb. Nothing. Just a thrashy asthmatic roar as the revs rose to strangulation point. And the idle was generic as.

Originally Posted by JC

As for the rest, you can convince your ears otherwise, but extractors make little to no difference to the note. They can't - they are pipe only - mufflers are what controls the noise levels.

But note and noise level are 2 different things. The mufflers control the noise level (at the tailpipe) but the length of the primary can influence the pitch, or note (higher/lower, harmonics etc).

[5tumpy]

I have 4499's... Down low is stronger than before... Not much difference in the top end... But for me, that's all that matter, I don't race it! :P


Noise is definitely deeper, maybe a little louder....

[sly]

Originally Posted by 5tumpy

I have 4499's... Down low is stronger than before... Not much difference in the top end... But for me, that's all that matter, I don't race it! :P

I can't really tell if there is a performance difference with mine. I had a blown TMAP sensor at the time, so performance was shite immediately before & after. Got that fixed & the chip was a problem. Got that fixed & the camshaft was an issue - the grind on the Crow cam was one and a half degrees retarded from spec & the engine yawned to 3000rpm before kicking in suddenly.

Have now got problems sorted & it goes OK, though I got a noticeable performance boost from washing & re-oiling the K&N filter panel a week or so ago!!! Have left the vernier cam gear 1&1/2 deg advanced and it's strongest between 1500 and 3500 revs - where it spends most of its time.

[schuldiner]

this was convenient... my ute will be going in for some extractors and a new zorst over the next few days. he suggested pacemakers and i forget which kinda exhaust $750 sound a decent price you reckon?

[private9]

I have them, and though they made a bit of a difference, it really wasn't much. Car definitely sounds different though, and in my opinion it sounds worse than when I just had the catback.

[BLACKAUXR8]

i put the pacemakers and a 2 1/2 mandrel bent exaust on my wifes car and gained 21.6 hp at the rear wheels just from the exaust!

[ENVI XR6]

how much did you guys pay for a set of pacemakers for a 6, i got quoted 700 today and that wasnt even the good ones

[JC]

Originally Posted by ENVI XR6

how much did you guys pay for a set of pacemakers for a 6, i got quoted 700 today and that wasnt even the good ones

Mine were around $550 fitted about 2.5 years ago. Expect to pay around $600 now. I can get wildcat extractors for my EL for $425 fitted.

[zhodak]

Originally Posted by ENVI XR6

how much did you guys pay for a set of pacemakers for a 6, i got quoted 700 today and that wasnt even the good ones

I paid $1150.00 about 4 weeks ago. The headers (4499) were $650, hi-flow cat was about $300, the rest was labour and the 2.5" mandrel exhaust. It worked out cheaper to get all done in one hit rather than seperatley. Also it made a big difference on a torque. It now pulls hard at pretty much any speed.

[AK]

Originally Posted by ENVI XR6

how much did you guys pay for a set of pacemakers for a 6, i got quoted 700 today and that wasnt even the good ones

I paid $550 installed for Pacemaker comps (4480).

[Casper]

I've had an 8 and I've got a 6 with a pretty decent exhaust system on it. No contest, it sounds nothing like the V8, never will. Quicker than the V8 I had yes, more fun yes but the V8 sound is sooooooooooooo much better.

[Mark351]

I own a V8 (headers, twin 2.5" system) and the I6 (headers, single 2.5" system) and there is a huge difference.

[Bucknaked]

I never said at full rev's it sounds like a V8. When it is idling it is definatley deeper sounding exhaust once it has warmed up.

Yes I know it will never sound like a V8 and thankyou to the experts for pointing that out :

[mik]

mine has a tuff note at idle every one walking past looks at the xr6 badge and you can see they are trying to pick is it an 8 or 6 , as soon as i bring the revs up i`m busted :(

[StealthAu]

I've had alot of people ask me if my car is a V8. It seems if its got a deep not and is louder then stock, some people assume it must be. But everyone that has asked me this, on a reply of no the next question is "oh, is it a v6?". I't sounds great, but nothing like a V8

[Burley]

hey i gotr race tuned paceysand new cat for 600 fitted....from a mate that is.....soundsa little different, its a six..not heaps as stated jut a little bit lumpier

[josh_hartman]

yeh i get my extracters put on tomorrow. I have a 2 1/2inch catback system on already with standard cut and standard extracters. i sorta blew the guts out my cut so i just opened it and ripped everything out so now its a straight threw cat. tomorrow the guy is putting my pacemakes on and modifying the flange on the cat from 2 1/4 inch to 2 1/2. hopefully this adds a bit more power and helps my exhausts potential abit because when i put that on i noticed no difference

[JC]

Originally Posted by josh_hartman

yeh i get my extracters put on tomorrow. I have a 2 1/2inch catback system on already with standard cut and standard extracters. i sorta blew the guts out my cut so i just opened it and ripped everything out so now its a straight threw cat. tomorrow the guy is putting my pacemakes on and modifying the flange on the cat from 2 1/4 inch to 2 1/2. hopefully this adds a bit more power and helps my exhausts potential abit because when i put that on i noticed no difference

I hope you are planning on replacing it with a properly operating cat. If not, you are adding noxious gasses to our air, and it is highly illegal, and not a performance mod. What you have is NOT a straight through cat, but a highly irresponsible bit of pipe only.

[private9]

Originally Posted by JC

I hope you are planning on replacing it with a properly operating cat. If not, you are adding noxious gasses to our air, and it is highly illegal, and not a performance mod. What you have is NOT a straight through cat, but a highly irresponsible bit of pipe only.

Not only that, but Zoom magazine did a test on gutted cats a while back, vs high flow cats, and found there to be little to no difference - namely because of the drastic change in diameter, the airflow was being restricted anyway, even without the "honeycomb" to slow things down.

[nikos]

Not only that, but Zoom magazine did a test on gutted cats a while back, vs high flow cats, and found there to be little to no difference - namely because of the drastic change in diameter, the airflow was being restricted anyway, even without the "honeycomb" to slow things down.

It doesn't matter, he is ending up with a cat that flows higher than stock, but a bit less than higflow, for no extra cost. Better than forking out an extra $350.

They don't get rid of all the gases anyway, only some of them. Also if anyone is that worried about the atmosphere then get a 4cyl.

[JC]

Originally Posted by nikos

It doesn't matter, he is ending up with a cat that flows higher than stock, but a bit less than higflow, for no extra cost. Better than forking out an extra $350.

They don't get rid of all the gases anyway, only some of them. Also if anyone is that worried about the atmosphere then get a 4cyl.

He is also breaking the law. If I find his rego number, I will be ringing the EPA for sure.

[b2tf]

Originally Posted by nikos

Also if anyone is that worried about the atmosphere then get a 4cyl.

You're a goose.