Got my pacemakers installed last friday, $580 all up. Very happy with the power gains, although not happy with the clearance issues. I know a few other ppl on here have also had clearance problems with the pacemakers, anyway, its only been like 4 days since I had them installed and already 2 dents :mad: . One is only fairly small, but the other is quite noticable, and the blue coating has been sracthed off :cry: .

How big would a dent have to be to affect the extactors performance? And can a dent in one pipe (as in 1 pipe from 1 single cylidner) that is big enough to fairly disrupt flow in that pipe, could that then affect the overall effectiveness of the extractors as a whole, ie: high and low pressures arrive in the 3-1 area at slightly different times due to dent causing gases from 1 cylinder to arrive later, some how impeding the way the extractors were intended to work to scavenge exhaust gases, ie: via the low pressure-high pressure sequence being disrupted? Any info would be great, unless your sign in name is turbo_charade :badgrin: .

Cheers.

want to lend my fluid dynamics text books from last year :P and no im not going to do the maths for ya

want to lend my fluid dynamics text books from last year :P and no im not going to do the maths for ya


U NO TELL ME!!! I KICK UR DOG!!!! :badgrin: Seriously though, thoughts anyone?

i cant see it affecting it more than sfa. maybe think of reinforcing it? rob would weld a nice little plate over it for you if u want

i cant see it affecting it more than sfa. maybe think of reinforcing it? rob would weld a nice little plate over it for you if u want

Yeah I was thinking of maybe some kinda of 'scraper' plate, so instead of scraping my extractor piping I would scrape the plate instead, because over time I can see the piping gettin fairly scratched back and rust/deterioration setting in, not cool at all. Any one else have any ideas?

Wrap it with exhaust heat wrap, that'll give it some protection against scrapes and dents.

Yeah, Im gonna figure out some way to protect my extractor piping. Im taking it back into the exhaust shop that fitted them in about a week to get the bolts retensioned, bottom ones are a bastard to get to, so when Im there I'll ask them if they have any recomendations on what to do, or even just do's and dont's when it comes to welding things on or around extractor piping, hopefully they'll be able to help me out.

Edit** Im more worried about the effect on the pacemakers effectiveness as opposed to a few scratches.

Akko hugs his 3.5L powered TJ which "should" have no extractor clearance issues when installed. :D

... unless I lower it more than it allready is and leave my tenpin bowling gear in the boot all the time that is!

i dont know how your extractors have been fitted but i have pacemakers too and they fit fine with no clearance issues at all. Do you think there is more than one way to mount them? or more than one model? Cause my clearance is fine

i dont know how your extractors have been fitted but i have pacemakers too and they fit fine with no clearance issues at all. Do you think there is more than one way to mount them? or more than one model? Cause my clearance is fine

Is yours the 3 litre? I think there might be different models or something. The reason mine scrape is because they sit forward and in front of in-line with the wheels, and down low a bit, and the cars lowered 40mm at the front aswell which doesnt help. So they're the foward most lowest point on my car now, which means they're the first thing to scrape.

nah i have a 3.5, and my extractors are not the closest point to the ground which is what i was tryin to say

when they bump they are putting alot of stress onto the head they are attached to aswell, considering they wont bend much

nah i have a 3.5, and my extractors are not the closest point to the ground which is what i was tryin to say

Thought it might be. I remember reading some where on these forums that the 3.5's sit higher then the 3 litres for some reason, explains why you don't have a problem with clearance anyway.

when they bump they are putting alot of stress onto the head they are attached to aswell, considering they wont bend much


yeah they don't bend, they just dent :rant: .

ive got about 5cm of extractors in different colours. Maybe i should raise it :doubt:

Thought it might be. I remember reading some where on these forums that the 3.5's sit higher then the 3 litres for some reason, explains why you don't have a problem with clearance anyway.

Its the height of the block, the 3.5 is stroked to get the extra 500cc :), thus a 3.0 spins up quicker, but lacks the torque and a 3.5 has bugger all extra 'top end' ...

If I were you (and many others with them installed) I would get a good exhaust place to modify the extractors (perhaps cut and sleeve, would need to be tidy), imagine the stress on the manifold mounting points each time you bottom out. Putting on a skidplate is not gonna stop the stress on the heads :(

yep`, haha. i also had a nice dent in my pacemakres when fitted :D

join the club! lol

Yeah, 3.0L here, I've scratched my pacies too. Whether or not it'll affect flow will depend on how badly dented it is, if it's say <5% of the diameter of the original pipe, I wouldn't worry about it, if it's >5%, maybe it may reduce your scavanging from that cylinder by x% proportional to the % of your dent. overall, you won't notice the drop. unless it's dented so badly that it has reduced the primary from 1.5" to 1".

Question, where did you bottom your baby out? Speed bump? curb? airbourne?

I only had clearance issues when I was on my Stock shockers, as soon as I changed my shockers, my car sat 5mm higher and the ride was far better, it never bottoms now. This is only my case, you may have perfectly operational suspension setup, maybe just too low at the front, so you could do what Wtchme did, cut the rear a little more.

The 3.0L engines where mounted lower than the 3.5's apparently...

Ahhh dam, I wanted to get Pacemakers soon too, but if they are going to dent and scratch.... :doubt: My drive way ate the tow hooks away on my lowerd TF :redface: , Imagine what it will do to the extrators :shock: , can't they make 3.0 specific ones, maybe modded or something??? :mad:

hmm... how big is your dip, do you scrap your front facia when you go into your drive way often? it's not that bad really, unless your car is super low with a lot of travel.

maybe you could start driving diagonal into your drive way?

does anyone here go to Brunswick shopping centre? you know they have the killer of gutter before entering the car park? well, if you turn normally into that car park, you'll stuff your pacemakers for sure! so you have to drive up the ramp diagonally. i'm sure everyone with a lowered car will know how to do it, it doesn't sound good when you hear scrapping from underneath the car, even if it was the mud flaps.

Only the hooks scrape always on the way down (steep driveway) and I can't go on an angle as it is too narrow, I'll post up a pic afterwork if it isn't too dark :confused:

so it scraps the tow hooks everytime you come down? I think you'll be in trouble if that was the case. but extractors on your manual TF would be the "BOMMB"

so it scraps the tow hooks everytime you come down? I think you'll be in trouble if that was the case. but extractors on your manual TF would be the "BOMMB"

Yes they would :badgrin: , but I was sort of planning to transfer all the mods from my Auto TF to my Manual TF :cry: ..Including the suspension :doh: I hope there is a way around it :pray:

for those who don't have their suspension lowered with the 3 litre model,...will they have much hassle with pacemakers n denting? and how the **** would you go over a speed hump with em besides diagonal :|

it depends on how low and how soft your suspension is, i think a stock would not have any troubles what so ever, I only had trouble previous due to my lowered shocks were stuffed and had no damperning. now with GT GAS, it's got good dampering and hence the car doesn't dip as much as it used to. so it's fine with me. my ride height at the fender is 680mm, it used to be 675mm. but it's not to do with the height, more to do with the damperning.

for unlowered 3.0 scraping isnt a problem except if u like parking as far forward as u can with the front over curbs, then its scrapes. i dented my extractors that way and my car is only 15 mm lower than stock , keeping sleeper look and i have a steep driveway.

i asked the exhaust shop about fixing it, and as turbo :D charde and booya said they assured me it would make no difference to performance or firing order tuning balance unless u really squashed the pipe by about 1/3 of diameter.

since pacemaker and wildcat are the only other extractors for magnas and dont care about stuffing up the claerance for 3.0's, especially lowered ones, maybe rpw doing there custom ones can make them shorter for the 3.0's... eh mitsiman?

The 3.0L engines where mounted lower than the 3.5's apparently...
They're mounted the same height, the exhaust ports sit higher for the 3.5 and as everything is designed for the 3.5, the 3.0's get shafted.

They're mounted the same height, the exhaust ports sit higher for the 3.5 and as everything is designed for the 3.5, the 3.0's get shafted.
It sux how the 3.0 guys get shafted :doubt: , we were out first :rant: heheh lol

we were out first :rant: heheh lol
Yeah, we're old skool, the originals and the trend setters!

AHHHH got the 3.5L, even more reasons to have the bigger engine!
More Power, More Torque, More Flexibility!!!!
I'm so glad i got the 3.5

turbo's :cool:

ditch this bs bout "there's no replacment for displacment"

hahah

so is your new motor 3.0 or 3.5 booya?

6G72 3.0L, actually :cool:

with the turbo setup we have, i think it would be pointless expense of finding a 3.5L.

the GT40R would far compensate for the loss of physical displacment. altho, we are only talking dimention's of a coke bottle slightly smaller :confused: ,

3.5 in N/A form, but 3L in turbo varient.
fully sic

that would be the 500ml coke bottle, or seen another way, the size of a F1 GP superbike engine!
anyway i reckon the undersquare 3.0 will rev through the roof only with valvesprings while the 3.5 would need full balancing etc to get there.

F1 has 3.0 litre V10 ATMO
IRL has 3.5 litre V8 ATMO
Champ car 2.65 litre V8 TURBO

F1 puts out around 900hp
IRL cranks out 650hp
Champ cranks out 750hp

Cubic inches is ok, Turbo is better .... 18,000 RPM is Gods gift ;)

I am a fan of the 3.0 :) Piston speed is slower in a 3.0 (less stroke) so its gonna be more reliable (for the same engine speed) and spin up faster.

turbo's :cool:

ditch this bs bout "there's no replacment for displacment"

hahah
I hear ya bro :P

F1 has 3.0 litre V10 ATMO
IRL has 3.5 litre V8 ATMO
Champ car 2.65 litre V8 TURBO

F1 puts out around 900hp
IRL cranks out 650hp
Champ cranks out 750hp

Cubic inches is ok, Turbo is better .... 18,000 RPM is Gods gift ;)

I am a fan of the 3.0 :) Piston speed is slower in a 3.0 (less stroke) so its gonna be more reliable (for the same engine speed) and spin up faster.

Yeah imagine even 10,000rpm on a Magna :P

The piston speed might not really be slower, even if the speed is the same as a 3.5, it has a shorter distance to travel from top to bottom so it would have higher revs for the same time period. I don't know if the piston speed is slower or faster in a 3.0, but I'm leaning to it being faster than the 3.5 due to smaller bore also and cam timing :)

F1 can be 3.0 atmo OR 1.5 Turbo, any V8, V10, V12.

its true that piston speed is slower at the same rpm for a shorter stroke. less distance to travel in the same amount of time. crank having larger diameter is also moving faster at its outsides, thats why i meant about the 3.0 should be able to rev harder with only better valvesprings and 3.5 would probably need balancing of pistons rods and crank to do the same.

All I know is that when we were at the engine plant last year, I was talking to one of the mitsu engineers, and his opinion was that "The 6g72 is the best engine that we have made for the magna, its a beautiful engine."

I think this guy wanted to have its babies however was enough to make me happy :)

F1 can be 3.0 atmo OR 1.5 Turbo, any V8, V10, V12.
Yup your right ... but no teams are running the V8 or the 1.5 turbo AFAIK.

I just got back from having my Pacemakers installed and I asked them (Midas) when they were installing them to see how much lower they sit to the original pipes. On completion he said it was about 1/2 inch lower but he said they can easily be modified and raised. Just my two cents worth.

MadMag, you and I have identicle :D Performance mods on our cars now. :D

MadMag, you and I have identicle :D Performance mods on our cars now. :D
It would appear that way but unfortunately my tired old Magna has done just over 200,000 clicks and is a little slumpier I would imagine. Still looks smart though, it's been looked after. Are you in Vic WhiteDevil?

I put my camera under the car and took a photo before, just had a look at it and boy, there they are hangin down and what is that little scrape mark already!!! oh well, my car has apparently been lowered a little.
http://neilk.customer.netspace.net.au/paceunder.jpg

ROFL

hahaha.. first day eh? and already scraped? hahah. welcome to the dented pacemaker club :bowrofl:

you are now an official member :D

ROFL

hahaha.. first day eh? and already scraped? hahah. welcome to the dented pacemaker club :bowrofl:

you are now an official member :D
Ironic isn't it!! Thanks for the membership, do I get promoted when I actually dent it! lol
Actually, I have a little amusing story, (well it is going to make me look like a d***head but what the heck) anyway, I went to a mechanic for a service once and mentioned that when I go over speed bumps at higher speeds I get a significant THUD go through the car and wanted him to check my suspension as my girlfriend's P.O.S. rides these speed humps almost as if they weren't there. He turns to me and says "Do you know what they are designed for? (speed humps) to slow the car down! (in a 'You Idiot' tone)" :doh: he was joking but serious and I felt like a right twat. I just meant to have a look as I was comparing my car to my gf's and didn't actually realise what I had said. :belt:

p.s. I know I am an idiot you don't need to remind me! he he