petefj40's build/mods

[petefj40]

The pipes won't be lower than they already are. No probs there.
The reason for twin pipes out the back is the location of the balancing tube. There's no other way. I'll up load some more pix showing you fellas what I mean.
My bros small block 305 Chev in his 40 has the single pipe out the back and sounds like a 6pack. Straight up. Even he's embarrassed about how insignificant it sounds.





My LS2 in the Holden runs a twin di filippo exhaust system. Sounds awesome! Way way better than a single system. Trust me. The 40's no different.

[petefj40]

i agree with skid on that pete .if you are going all the way to the back 2 into 1 sounds the shiz when on song

From my own little experiences of throwing money at exhaust systems, I beg to differ.

Sorry fellas. Adams 305 sounds weak on song.
NOTHING like my 350.

[skid]

i agree with skid on that pete .if you are going all the way to the back 2 into 1 sounds the shiz when on song

From my own little experiences of throwing money at exhaust systems, I beg to differ.

Sorry fellas. Adams 305 sounds weak on song.
NOTHING like my 350.

comparing a 305 to a 350 is like comparing apples with oranges

totally different

everyone has their opinions dude

I had twins and exiting by your ear, sounding stink

went to a 3" single exiting back left and maaate it was so much sweeter sounding

had it a work one day after hours and a guy was installing a heat pump and as I was loading it on the trailer after a few laps of the block he came over and told me he was a ford man and I informed him I was too, but my 40 had a dirty ol chev in it

he told me it was one of the crispest sweetest sounding 8s hes ever heard

I agreed


but some folks have different ears so we'll leave it there

[petefj40]

i agree with skid on that pete .if you are going all the way to the back 2 into 1 sounds the shiz when on song

From my own little experiences of throwing money at exhaust systems, I beg to differ.

Sorry fellas. Adams 305 sounds weak on song.
NOTHING like my 350.

comparing a 305 to a 350 is like comparing apples with oranges

totally different

everyone has their opinions dude

I had twins and exiting by your ear, sounding stink

went to a 3" single exiting back left and maaate it was so much sweeter sounding

had it a work one day after hours and a guy was installing a heat pump and as I was loading it on the trailer after a few laps of the block he came over and told me he was a ford man and I informed him I was too, but my 40 had a dirty ol chev in it

he told me it was one of the crispest sweetest sounding 8s hes ever heard

I agreed


but some folks have different ears so we'll leave it there

Did your twin system run a hard core balancing tube skid?
Mine didn't to start with and not only did it sound like a tractor but the performance sucked.

[skid]

Did your twin system run a hard core balancing tube skid?
Mine didn't to start with and not only did it sound like a tractor but the performance sucked.

yup, tried a few different approaches to the balance tube, but it still sounded like arse

[petefj40]

Did your twin system run a hard core balancing tube skid?
Mine didn't to start with and not only did it sound like a tractor but the performance sucked.

yup, tried a few different approaches to the balance tube, but it still sounded like arse

The balancing tube on mine is the same as the system. 3 inch.
I couldn't believe the difference it made.

So at the end of the day.
I'll have the same sounding 40 (which I'm told is pretty sweet), just a little quieter. Oh and certifiable.

I must say. The way it was. When I was towing the boat up to Nelson last, I really wanted to wear ear muffs. It was that loud going up hills at 100k.

Have you ever heard a 4 or 6 going hard past you and you swear it sounds like someone blowing really really hard through a small straw.

Gimme flow n lots of it over an asthmatic any day boys.

[chevrolux]

im about to do my pipes. didnt know about balancer tubes. just googled it up and do you only use a balancing tube when you have dual exhausts? i was just planning on go down as far as possible with two pipes then exiting out one. im not going to have to worry about a balance tube aye?

[fj40]

im about to do my pipes. didnt know about balancer tubes. just googled it up and do you only use a balancing tube when you have dual exhausts? i was just planning on go down as far as possible with two pipes then exiting out one. im not going to have to worry about a balance tube aye?

no u dont have to worry about the balance pipe but twin pipe it

[skid]

im about to do my pipes. didnt know about balancer tubes. just googled it up and do you only use a balancing tube when you have dual exhausts? i was just planning on go down as far as possible with two pipes then exiting out one. im not going to have to worry about a balance tube aye?

no u dont have to worry about the balance pipe but twin pipe it

and for a completely different answer

talk to safaripete, hes done single and lovin it

[petefj40]

im about to do my pipes. didnt know about balancer tubes. just googled it up and do you only use a balancing tube when you have dual exhausts? i was just planning on go down as far as possible with two pipes then exiting out one. im not going to have to worry about a balance tube aye?

Seems everyone has their different opinion on balancing tubes.

The owner of, "Kevin Geary Performance & Automotive" here in Chch (kevingeary.co.nz) will tell you.

The whole point of the "balancing tube" is to equal back pressure in all 8 cylinders making it perform to it fullest. It's that simple.
That's what he's told me...
And by crikey, he knows his shit. Coz under the foot now, it farken flys.

[petefj40]

Some pix of the pipes new location. This is the left side. The other side to be modeled.

dont bother with the other side dude

trust me single all the way

sounds sooooo much better

I'll take some more pix this avo skid. But there's no room under the truck for the two mufflers on one pipe. It just wouldn't work mate. Having the same setup as I already have but with better mufflers and longer pipes heading out the back is going to give me similar performance but with a legal note.
To go into one pipe would of meant re-working the whole system from the collectors to the back of the truck.
This way is cheaper and the easiest way to get it legal brothers!

[petefj40]

just googled it up and do you only use a balancing tube when you have dual exhausts?

Not sure where your google trip took you there mate.
I just googled it and this is what I got after searching for 10 seconds.

" we all know, the purpose of Balance Tubes and/or "H-Pipes" is to equalize the exhaust pulses which minimizes backpressure. It also helps quiet the exhaust system tone, especially on 2.5" systems. We highly recommend the use of them on all V8 applications

When placed according to instructions, the balance tube will equalize the pulses coming from the header collectors thus creating a smoother flow through the exhaust system. This means less backpressure and horsepower loss. We know that on the 2.5" system it will significantly reduce the sound level with the bigger cams and the same is true to a lesser degree with the 3" systems. The following Kits fit our Torque Tech systems and should fit others."



Yeah, pretty simple.
Don't listen to what anyone else tells you.

RUN A BALANCING TUBE

[petefj40]

i agree with skid on that pete .if you are going all the way to the back 2 into 1 sounds the shiz when on song

I guess if each side meets up into the one pipe means it would act as a balancing tube equalizing things would work. But the only thing I don't like about that is all that volume going into a wee 3" pipe. To me that reduces flow. That's where a balanced twin 3' system beats a single 3' every time....I'd say.

Hey fellas.
I know I come across as a know all bastard.
I'd say I'd be one of the ones round here that know the least about the offroad scene.
I'm only sharing what's been shared with me. Or try to.

[timotheus]

I'm only sharing what's been shared with me. Or try to.

I appreciate it.
And I couldnt tell you if you were right or wrong either.

Tim.

[petefj40]

I'm only sharing what's been shared with me. Or try to.

I appreciate it.
And I couldnt tell you if you were right or wrong either.

Tim.

Obviously the single pipe works a treat n people swear by it. And that's cool.

[petefj40]

A lot of thought has gone into this system.
This is the fourth attempt to get it right.

This is the only place for these mufflers. One of these each side.



This is the only location the balancing tube can go.



And it's all pretty tight under there.

[skid]

I dont have any pics of me system, but here it is in a nutshell


block hugger headers, passengers side goes down and back into a collector

drivers side goes down and under the back of the sump to meet up with the passengers side, then a single 3" pipe located above the chassis rails goes down the back into a single HSV muffler and exited in the back left corner

sweetest sound you ever heard and lots of folks can vouch for it.


but that just a dirty ol tree fiddy




reason for replacing twins......

A; hated the sound

B; they ran out in front of back wheels on each side and got smashed on chassis rails till I used to end trips with open headers, which sounds farken awesome from a distance but not so flash from the drivers seat

[surflover]

I can vouch for Pete's setup it sounds awesome. We have 1uz ported into 1 and the twin in MY Opinion sounds better. Keeping in mind the 1uz and ls1 engines are quite different

[petefj40]

The new pipe work is all done.
Now they're off to the sand blasters tomorrow then paint on Thursday.




And the old pipe work.

[Bulletproof]

I used to hot up v8s 40 years ago and I think a tight bend in the pipe to the exhaust is completely the wrong thing to do for performance

Cheers Richard

[petefj40]

I used to hot up v8s 40 years ago and I think a tight bend in the pipe to the exhaust is completely the wrong thing to do for performance

Cheers Richard

I've spent lots of time n money on dyno runs n exhaust systems on both of my V8's Richard. But I don't know anywhere near as much about V8's as much as the people that are doing the work on both my weapons..
I'm sure you know what you're talking about.
But the tight bends were in the original system and it performs very well thanks.

The picture that has the muffler in it.
The pipe goes tight to the left below the top one. Both are tight together. That's the balancing tube's flange.
The flow design is the best that could be done in the area we had.

So the system is the same as before only with longer pipes taking it out the back and different mufflers.

[smurf182]

Pretty sure they changed the firing order for the LS series so an exhaust that sounds good on an LS1 may not work for a SBC and vice versa.

Also, on the subject of bends

It is perhaps relevant to mention that a cursory glance at any F1 exhaust system will demonstrate conclusively that exhaust gases do not at all mind going round tight bends. The 6 into 1 system (photo) from an F1 Ferrari illustrates the point. Also noteworthy is the modest diameter of the tailpipe - about 2.75" for an engine producing around 800 b.h.p.

[petefj40]

Cheers for clearing that up smurf.

[petefj40]

Talking about exhaust systems.
My brother brought my old 5.7L LS1 motor out of my Holden to put in his jetboat last year. He gave the boat n motor to the fellas here at Hamilton Jet marine in Christchurch.
While they did a mint job installing it. The exhaust system didn't have mandrill bends in it. Oh no. They straight cut n welded pipes together like it was a down pipe on the side of the house FFS!!!!

It's like, WTF!! I'll throw a pic up later.

[Bulletproof]

Also, on the subject of bends

It is perhaps relevant to mention that a cursory glance at any F1 exhaust system will demonstrate conclusively that exhaust gases do not at all mind going round tight bends. The 6 into 1 system (photo) from an F1 Ferrari illustrates the point. Also noteworthy is the modest diameter of the tailpipe - about 2.75" for an engine producing around 800 b.h.p.

The difference here is that these are tuned extractors with each pipe the same lenght so are sucking the fumes out.

I have tight bends on my extractor too.

Further down the ehaust pipe the opposite is happening causing restriction and back pressure.

Cheers Richard

[petefj40]

Also, on the subject of bends

It is perhaps relevant to mention that a cursory glance at any F1 exhaust system will demonstrate conclusively that exhaust gases do not at all mind going round tight bends. The 6 into 1 system (photo) from an F1 Ferrari illustrates the point. Also noteworthy is the modest diameter of the tailpipe - about 2.75" for an engine producing around 800 b.h.p.

The difference here is that these are tuned extractors with each pipe the same lenght so are sucking the fumes out.

I have tight bends on my extractor too.

Further down the ehaust pipe the opposite is happening causing restriction and back pressure.

Cheers Richard

You're talking about your system here?
"Further down the ehaust pipe the opposite is happening causing restriction and back pressure."

I'd say the F1 fellas have done enough research n development to know what runs best. Tight bends and necked down to about 2.75" doesn't seem to slow them down.

But I'd say my bros water cooled exhaust system in his boat is restrictive. I mean, not only does gas flow down it but water as well.

[mercutio]

these are the headers on one of my mercedes cars they are factory fitted ones bloody annoying to remove though

[petefj40]

yep, they are shiny. that's why they will get altered from this look. Though I like it. it'll get crunched the first time I go off road.

I'll upload a sound track if anyone's interested.
To me it sounds WAY better.
It's gone from 105db to 90db.

[petefj40]

these are the headers on one of my mercedes cars they are factory fitted ones bloody annoying to remove though

They look bloody nice though

[mercutio]

these are the headers on one of my mercedes cars they are factory fitted ones bloody annoying to remove though

They look bloody nice though

yeah they are the things i show people to prove to them it isn't your average mercedes