EXHAUST QUESTIONS ANSWERED BY AN EXHAUST TECH

[pcman]

ooo good theread

ok here goes

ford 250 xflow alloy head 100% stock but rebuilt ,gas research s400, hitachi Ht18s turbo (from s5 rx7) hope to be running 9psi boost intercooled using standard webber intake and gra adapter

the outlet is 2.5" on the turbo dump what would you reccomend as a zorst setup preferably 1 muffler/resonator as its really all i have room for

[EXHAUSTFIX]

ooo good theread

ok here goes

ford 250 xflow alloy head 100% stock but rebuilt ,gas research s400, hitachi Ht18s turbo (from s5 rx7) hope to be running 9psi boost intercooled using standard webber intake and gra adapter

the outlet is 2.5" on the turbo dump what would you reccomend as a zorst setup preferably 1 muffler/resonator as its really all i have room for

9 lb boost i would proberly stick with 2.5"
if you want to keep the noise legal not loud
use a manumatic muffler part no f744m
this will give yoou good flow and take out quite a bit of noise
if you want it loud just use a strait through muffler about 16" long no chambers inside muffler

ross

[pcman]

ooo good theread

ok here goes

ford 250 xflow alloy head 100% stock but rebuilt ,gas research s400, hitachi Ht18s turbo (from s5 rx7) hope to be running 9psi boost intercooled using standard webber intake and gra adapter

the outlet is 2.5" on the turbo dump what would you reccomend as a zorst setup preferably 1 muffler/resonator as its really all i have room for

9 lb boost i would proberly stick with 2.5"
if you want to keep the noise legal not loud
use a manumatic muffler part no f744m
this will give yoou good flow and take out quite a bit of noise
if you want it loud just use a strait through muffler about 16" long no chambers inside muffler

ross

thanks for that any chance on a price on themuffler you sugested i want it loud but not stupid

also how much per bend for 2.5" 45 and 90's or mandrel dounuts would be beter

many thanks

[EXHAUSTFIX]

ooo good theread

ok here goes

ford 250 xflow alloy head 100% stock but rebuilt ,gas research s400, hitachi Ht18s turbo (from s5 rx7) hope to be running 9psi boost intercooled using standard webber intake and gra adapter

the outlet is 2.5" on the turbo dump what would you reccomend as a zorst setup preferably 1 muffler/resonator as its really all i have room for

9 lb boost i would proberly stick with 2.5"
if you want to keep the noise legal not loud
use a manumatic muffler part no f744m
this will give yoou good flow and take out quite a bit of noise
if you want it loud just use a strait through muffler about 16" long no chambers inside muffler

ross

thanks for that any chance on a price on themuffler you sugested i want it loud but not stupid

also how much per bend for 2.5" 45 and 90's or mandrel dounuts would be beter

many thanks[/quote
muffler about $65 mandrell bends $18

[ofr57]

G'day

I'm just wondering if there would be problems doing a 2 inch exactors , hot dog muffler , 2inch exhaust pipe all the way and a trumpet tip
(old school thing)

do i have to make my own trumpet or do exhaust shops still make them

what sort of car are you talking about please

oh sorry .. its going on a 1.3 zookie trailer queen

[EXHAUSTFIX]

G'day

I'm just wondering if there would be problems doing a 2 inch exactors , hot dog muffler , 2inch exhaust pipe all the way and a trumpet tip
(old school thing)

do i have to make my own trumpet or do exhaust shops still make them

what sort of car are you talking about please

oh sorry .. its going on a 1.3 zookie trailer queen

no problem at all but i dont think i can do the trumpet tip im not sure if my tooling will alow me to flare it

[ofr57]

G'day

I'm just wondering if there would be problems doing a 2 inch exactors , hot dog muffler , 2inch exhaust pipe all the way and a trumpet tip
(old school thing)

do i have to make my own trumpet or do exhaust shops still make them

what sort of car are you talking about please

oh sorry .. its going on a 1.3 zookie trailer queen

no problem at all but i dont think i can do the trumpet tip im not sure if my tooling will alow me to flare it

sweet.... guess i'll just have to make my own trumpet then

[beebee]

Ok here's one that will interest a few of the OL members. With the explosion of small lightweight rockcrawling buggies on the scene, we are always trying to keep up with the USA. Looking at many of the pics from US, a lot will go to the effort of making custom headers. Is it worth the effort ($$$)? Considering the exhaust from head to tailpipe is probably only 1.5m long, are there significant gains to be had?

The most popular motors in Aus for this application are Range Rover V8, Commodore V6, LS1 and some Chev 350. Standard header/extractors are out of the question due to size constraints.

The plan for our buggy (Commodore V6) was to butcher the standard manifold as necessary, then dual 2" (or 2 1/4") into a 2 1/2" Flowmaster (50 Series Delta flow). How does this sound??

Thanks in advance

Any advice?

[EXHAUSTFIX]

Ok here's one that will interest a few of the OL members. With the explosion of small lightweight rockcrawling buggies on the scene, we are always trying to keep up with the USA. Looking at many of the pics from US, a lot will go to the effort of making custom headers. Is it worth the effort ($$$)? Considering the exhaust from head to tailpipe is probably only 1.5m long, are there significant gains to be had?

The most popular motors in Aus for this application are Range Rover V8, Commodore V6, LS1 and some Chev 350. Standard header/extractors are out of the question due to size constraints.

The plan for our buggy (Commodore V6) was to butcher the standard manifold as necessary, then dual 2" (or 2 1/4") into a 2 1/2" Flowmaster (50 Series Delta flow). How does this sound??

Thanks in advance

Any advice?

with a v6 and such a short system its proberly best to try and set them up lyke a formula v extractors that come up and over the top of the motor to get a bit of length into them and then in to a single system not a twin as you want all the low down power you can get mabye run a super trap on the back so you can adjust the noise and the back pressure

ross

[beebee]

Ok here's one that will interest a few of the OL members. With the explosion of small lightweight rockcrawling buggies on the scene, we are always trying to keep up with the USA. Looking at many of the pics from US, a lot will go to the effort of making custom headers. Is it worth the effort ($$$)? Considering the exhaust from head to tailpipe is probably only 1.5m long, are there significant gains to be had?

The most popular motors in Aus for this application are Range Rover V8, Commodore V6, LS1 and some Chev 350. Standard header/extractors are out of the question due to size constraints.

The plan for our buggy (Commodore V6) was to butcher the standard manifold as necessary, then dual 2" (or 2 1/4") into a 2 1/2" Flowmaster (50 Series Delta flow). How does this sound??

Thanks in advance

Any advice?

with a v6 and such a short system its proberly best to try and set them up lyke a formula v extractors that come up and over the top of the motor to get a bit of length into them and then in to a single system not a twin as you want all the low down power you can get mabye run a super trap on the back so you can adjust the noise and the back pressure

ross

Thanks for the tip

[PJ.zook]

Gday 'doctor exhaust', im installing a small n/a turbo onto my 1.3 sierra G13A and am just wondering a few small details.
What location is best after the turbo for installing the wideband o2 sensor and does it matter if its before or after where the wastegate exhaust enters the dump pipe?
How far down would be best to tap the wastegate exhaust into the main turbo exhaust stream?
With the headers, am i right in thinking making them as short as possible?
And do i make up custom tube headers that have the 4 pipes meet in a collector right before the turbo, or run a common single pipe straight out of the ports which goes to the turbo like a prime mover diesel?
Im making headers out of steampipe most likely, will i need any other support or bracing for the turbo or will it hanging off the headers be enough?
What size exhaust should i use, i would assume 2" would be enough? I want a nice loud note but not rediculous and droning.

Basically, this is just a simple buildup im doing from bits at home, and im also going to be running a custom sequentially injected intake manifold too if that matters with exhaust. The engine will stay exactly the same internally, ill be only running about 6psi.

[EXHAUSTFIX]

Gday 'doctor exhaust', im installing a small n/a turbo onto my 1.3 sierra G13A and am just wondering a few small details.
What location is best after the turbo for installing the wideband o2 sensor and does it matter if its before or after where the wastegate exhaust enters the dump pipe?
How far down would be best to tap the wastegate exhaust into the main turbo exhaust stream?
With the headers, am i right in thinking making them as short as possible?
And do i make up custom tube headers that have the 4 pipes meet in a collector right before the turbo, or run a common single pipe straight out of the ports which goes to the turbo like a prime mover diesel?
Im making headers out of steampipe most likely, will i need any other support or bracing for the turbo or will it hanging off the headers be enough?
What size exhaust should i use, i would assume 2" would be enough? I want a nice loud note but not rediculous and droning.

Basically, this is just a simple buildup im doing from bits at home, and im also going to be running a custom sequentially injected intake manifold too if that matters with exhaust. The engine will stay exactly the same internally, ill be only running about 6psi.

hi there

when making your turbo manifold
use but weld elbows you can get them from reese plumbimg
they are very heavy mandrell bends
dont worry to much about your pipe lengths beeing the same keep them rather short use a 4 into 1 collector cone withe a flat plate on the bottom of it to match your turbo plate do try and make up a brace to go from the block to the turbo plate for support

fit your o2 sensor befor the bend that goes under the sump

with the waist gate pipe run this about 12" long
and when you put it into the main pipe make sure that it goes in on a 45%angle and you have about 2mm sticking inside the pipe this will create a vachume affect and draw the gasses from the waistgate quicker

also keep the internal pipe size of the header the same as the port size
good luck with your project
ross

[PJ.zook]

Thanks for that

[silver dingo]

Dear Dr. Ex.
I am researching a set of extractors and a 2 and 3/4 inch stainless system for my 4.8 litre patrol. Whilst I do like a muted extraction note to my vehicles i am not into loud. What mufflers would you recco to give me the flow as well as quiet.
Thanx in advance.

[EXHAUSTFIX]

Dear Dr. Ex.
I am researching a set of extractors and a 2 and 3/4 inch stainless system for my 4.8 litre patrol. Whilst I do like a muted extraction note to my vehicles i am not into loud. What mufflers would you recco to give me the flow as well as quiet.
Thanx in advance.

v8 i presume

i do extractors and 3" for those and they respond so well
front muffler 11"x6"x20"long
rear muffler 6"round 16"long
doth mufflers straight through the front one oset centre

[silver dingo]

I should have been more specific doc, Its the nissan straight 6 twin over head cam engine. cheers.

[EXHAUSTFIX]

I should have been more specific doc, Its the nissan straight 6 twin over head cam engine. cheers.

ok same system but in 2.5"

[awill4x4]

As a general rule of thumb. Does fitting headers and a free flowing exhaust to a 4.2 auto GQ improve power and driveability through the rev range or does actually cost you in low down torque figures?
If an improvement can be gained in low down torque with headers. Do you have a recommendation with regards to brands, eg: Pacemaker, Genie etc and is a "Tri Y" configuration the way to go.
Thanks for all your time and info Regards Andrew.

[EXHAUSTFIX]

As a general rule of thumb. Does fitting headers and a free flowing exhaust to a 4.2 auto GQ improve power and driveability through the rev range or does actually cost you in low down torque figures?
If an improvement can be gained in low down torque with headers. Do you have a recommendation with regards to brands, eg: Pacemaker, Genie etc and is a "Tri Y" configuration the way to go.
Thanks for all your time and info Regards Andrew.

if your worried about low torque your proberly better going for the cheaper genie brand called wildcat
as they are press bent and will give a small amount of restriction which is good for torque

do not go big on the exhaust i would stick with 2.25" and go to straight through muff;ers olso helping with torque - keeping smaller pipe size but the extractors and straight through mufflers will give you a power gaain and a bit of restriction in the headers and the right pipe size will help with the torque

ross

[V8Patrol]

Do you do custom extractors by any chance or can you supply a set of bends etc so that I can make my own?

I have a 340 hemi pumping out 700HP ( can supply dyno sheets if needed to better enhance power curve ) , the stractors are at the end of their life with a few minor pit holes appearing around mainly the second collectors.
The body type is a CL Charger by Chrysler, does not have power steering but does have a remote oil filter setup & there 's an auto in behind the motor.

The car is currently in a million pieces to do a full respray so I'm in no hurry at the moment, just planning ahead

Kingy

[EXHAUSTFIX]

How about a system for a GQ which does NOT HAVE A 4.2 IN IT to all the smart arse replies in advance)

Its a TD2.8 97 GQ. Bog standard apart from finer filters. I'm thinking a 2.5 " might improve it

A rough price too? I'll be driving it to Melb later this year. Surrey Hills isn't too far away from Croydon, so I'd book it in, in advance.

around $320

[EXHAUSTFIX]

Do you do custom extractors by any chance or can you supply a set of bends etc so that I can make my own?

I have a 340 hemi pumping out 700HP ( can supply dyno sheets if needed to better enhance power curve ) , the stractors are at the end of their life with a few minor pit holes appearing around mainly the second collectors.
The body type is a CL Charger by Chrysler, does not have power steering but does have a remote oil filter setup & there 's an auto in behind the motor.


The car is currently in a million pieces to do a full respray so I'm in no hurry at the moment, just planning ahead

Kingy

at a quick calculation in my head that is a 520klw engine a bit of a monster
i need to know if its for road use or track
you do know they are one of the hardest cars to build a good set of extractors on

[HotFourOk]

Hey man,

Just wanting to upgrade the exhaust from turbo back on my 1993 F78 2.8 Turbo Intercooled Diesel Daihatsu Rocky.
It runs 11psi standard and the stock exhaust seems way to small... Just wondering what size you would use and what mufflers etc. I was thinking about 2.5" with a straight through muffler at the rear... not sure about the noise though.. I've never had a diesel before...

and YAY!.. I dont need a cat

[Bundy_Harry]

Exhaustfix,

I am building a 22RE 2.4 litre 4 cyl EFI motor for an 86 Bundera.

I would like to know, what is the most effective system for running quiet without sacrificing too much power?

Would keeping the cast iron headers make much difference?
How would multiple mufflers affect the flow and overall power?

Thanx in advance
Bundy_Harry

[EXHAUSTFIX]

Hey man,

Just wanting to upgrade the exhaust from turbo back on my 1993 F78 2.8 Turbo Intercooled Diesel Daihatsu Rocky.
It runs 11psi standard and the stock exhaust seems way to small... Just wondering what size you would use and what mufflers etc. I was thinking about 2.5" with a straight through muffler at the rear... not sure about the noise though.. I've never had a diesel before...

and YAY!.. I dont need a cat

2.5"will work fine
muffler should b a 10x4x20" ofsset muffler straight through
this will not be loud
you will get a good power increase
ross

[leroy]

Exhaustfix,

Have you had much to do with late model diesels such as 3.0l Patrols? Do they have a restrictive dump pipe like the 4.2td? I had a quick look under my 3.0 and it looks like the cat comes straight from the turbo. Is this right? Would I benefit from a 3" system? I think the turbo outlet is 2.5". Would you replace the whole system from the back of the turbo including a new cat or no cat or just from the back of the cat. What performance increase and of course what dollars $$ am i looking at? Many questions I know but thanks in advance.

Leroy

[EXHAUSTFIX]

Exhaustfix,

I am building a 22RE 2.4 litre 4 cyl EFI motor for an 86 Bundera.

I would like to know, what is the most effective system for running quiet without sacrificing too much power?

Would keeping the cast iron headers make much difference?
How would multiple mufflers affect the flow and overall power?
extractors always help with torque
and you could run 2.25:up to the main muffler then a 2" tail pipe
proberly resenator near the gearbox a large straight through muffler and a resonator in the tail this will keep it quiet

Thanx in advance
Bundy_Harry

you will get a good gain out of this im doing one in two weeks
remember it is illlegal to change the position of a convertor

i would be making a 2.5" dump and cat assembly make sure it is a s/steel core not ceramic
and a 2.5" system with a large straight through muffler
this will work very well

[beally]

Gday, what specs do you think are best for my 1.3 sierra running a fuel injection and a supercharger at 9 psi. Would the stock headers have benifits over a set of extractors, and what od exhaust and muffler would you think would be best. Also do you know the legalities surrounding side pipes.

thanks in advance.

[EXHAUSTFIX]

Gday, what specs do you think are best for my 1.3 sierra running a fuel injection and a supercharger at 9 psi. Would the stock headers have benifits over a set of extractors, and what od exhaust and muffler would you think would be best. Also do you know the legalities surrounding side pipes.

thanks in advance.

with any forced induction on a car the need to breath very well in the exhaust
if you have back pressure on a super charger you will loose boost
you must fit extractors and about a 2.25" system with straight through mufflers

[Goldey]

Dear Doctor Exhaust

This has been a riveting read.

I myself am too looking for advice. I have a 2.7 litre petrol (3RZ-FE)Toyota Prado (ie not much go go ). Have toyed with lots of ideas about engine transplants etc, but dollars are an issue .

What in your opinion could be done with the exhaust to yield a few more ponies. The system at the moment is the stock standard one and is looking pretty suss in terms of rust, so now is going to be a good time for a replacement.

Would there be anyone who makes a performance header/extractors for this model??? Is 2.5" system going to be too big and restrict flow?

Thanks in advance

Goldy