EXHAUST QUESTIONS ANSWERED BY AN EXHAUST TECH

[EXHAUSTFIX]

hi

I have a Tb42 turbo now and i want it to make a fair bit of noise and sound good..

I'm going to have a 3" mandrel system it's on a GQ patrol short wheel base..

Guy at the exahust shop said a straight thru muffler will be quiter then a muffler with a plate or something inside it..

He suggested a race magnum for something ..

Just want your oppion what muffler to use for maxium flow for the turbo and as much noise as possible as it will be alot quiter anyway i think..

Thanks

Rick.

look up a company in your state called super cat converters and get a muffler form them part number (scm8830)
11"x6"x18"long straight through

[EXHAUSTFIX]

I'm picking up a 1995 3l TD surf on Tuesday.

Has stock exhaust on it atm..

Im wondering what the costs will be to wack a decent system on it... Not overly fussed about the noise, I've got extractors on my hilux now that are loud.

Probably run stock boost on it now (may change it later) so would be after a flexible option as far as size goes.

The surf guys seem to run straight through with a hotdog on the end..

Not sure what my options are

Oh... and since you are in croydon, you'll be doing the work (Bloke here at work has given you rave reviews as well)

if u are going to upgrade your boost at a later date you may want to concider running 3 " as u will need it later
1 straight through muffler is ample

Do you know what sort of $$$ we are talking about for this?

What sort of economy/power gains are to be had

Thanks heaps for the replies

Just found some info on the turbo specs if this helps with an idea of cost at all:

Manufacturer Toyota (Hitachi) Export Specification (Steel Turbines)
Type CT-12B (PN: ? (Front), ? (Rear)

Turbine size (Outlet diameter) 44mm
Turbine size (Inlet diameter) 52mm
Turbine blade count 9
Turbine material Steel
Turbine housing Inlet (ID)
Turbine housing Outlet (ID) 50.1mm
Turbine shaft Diameter 7.5mm

Turbine housing A/R

Compressor size (Inlet diameter) 39mm
Compressor size (Outlet diameter) 58mm
Compressor blade count 10
Compressor material Aluminium
Compressor housing Inlet (ID) 49.8mm
Compressor housing Outlet (ID)
Compressor housing A/R

*Wastegate size (ID) 30mm
Actuator spring rate 10 psi

Bearing ID 8.53mm
Bearing OD 13.55mm
Bearing width 9mm
Bearing material Bronze
Bearing oiling holes (per bearing)

you wpuld get an increase of about %15

[Mudsierra]

G'day i've got 1.3L G13A, it has a factory 4-1 exhaust system, i was wondering if it'd make difference after fitting 4-2-1 extractor with the original exhaust system as it's nearly new?

Or do you recommand fitting in sport system for up to 2 inch?

cheers

andrew

[mattsluxtruck]

Hi Ross
I have an 85 4runner with a Holden 253 in it. My question is do you know if anyone make a set of extractors to suit? If not any ideas on what i might be able to get in sort of easily? Or if worse came to worse what would you charge for a custom made set?
Matt

[Bruzar]

gday mate, ive got a TD42 with snorkel and pacemaker extractors, im wanting to get a turbo but that will probably happen towards end of the year.
which exaust set up would be best for?

alot of people say 2.5 inch so i dont lose L4 grunt.......

can you please recomemd part number or exact brands, or how to have installed for best preformance.....

thanks for advice...

[Draven]

Hi there,

I will be starting a Ls1 into a GQ Conversion very soon, and am having troubles finding someone that can either sell me or make headers that will clear the chassis. Are you able to supply / make such a thing ?

Thanks

Glen.

[EXHAUSTFIX]

G'day i've got 1.3L G13A, it has a factory 4-1 exhaust system, i was wondering if it'd make difference after fitting 4-2-1 extractor with the original exhaust system as it's nearly new?

Or do you recommand fitting in sport system for up to 2 inch?

cheers

andrew

if it already has extractors dont bother changind them but i would suggest a 2" system

[EXHAUSTFIX]

Hi Ross
I have an 85 4runner with a Holden 253 in it. My question is do you know if anyone make a set of extractors to suit? If not any ideas on what i might be able to get in sort of easily? Or if worse came to worse what would you charge for a custom made set?
Matt

hi there you cant buy anthing alreade made for them it would have to be a custom set around $850

[EXHAUSTFIX]

gday mate, ive got a TD42 with snorkel and pacemaker extractors, im wanting to get a turbo but that will probably happen towards end of the year.
which exaust set up would be best for?

alot of people say 2.5 inch so i dont lose L4 grunt.......

can you please recomemd part number or exact brands, or how to have installed for best preformance.....

thanks for advice...

leave you pacemaker extractors on they are ok
ad get a 2"5 exhaust made up for it make sure u a realy large mufflerin the front and a good resonator in the rear
supercat front muffler part no scm8803 berklee rear bm444

[EXHAUSTFIX]

Hi there,

I will be starting a Ls1 into a GQ Conversion very soon, and am having troubles finding someone that can either sell me or make headers that will clear the chassis. Are you able to supply / make such a thing ?

Thanks

Glen.

nothing off the shelf i would gave to custom make them on the car

[Hekta]

Hi Exhaustfix,

My exhaust is RS and in need of replacement. It's on a 3Ltr V6 Pajero.

Bitsamissin has this setup

Yep I've got Genie extractors, high flow V8 Guppydore cat, high flow muffler and 2.25" exhaust. It made a noticeable difference.
You need some backpressure so a 2.5" is too large.

Can you clarify what he means by this ? Would you get less benefit out of a bigger 2.5" system ?

[CHOPS1]

Just a quicky, i have a sierra 1.3. it has extractors and a 2" exhaust with hotdog. Will a straight through exhaust give me a bit more power?(it'll be for offroad/comp driving) even if just helping a little, its a gain i need! LOL

chop

[EXHAUSTFIX]

Hi Exhaustfix,

My exhaust is RS and in need of replacement. It's on a 3Ltr V6 Pajero.

Bitsamissin has this setup

Yep I've got Genie extractors, high flow V8 Guppydore cat, high flow muffler and 2.25" exhaust. It made a noticeable difference.
You need some backpressure so a 2.5" is too large.

Can you clarify what he means by this ? Would you get less benefit out of a bigger 2.5" system ?

WITH A 2.5 " SYSTEM YOU WILL GET A GOOD POWER GAIN the back pressure u need to create torque is enough created by the cat muffler and bends u realy only need about 2.5lb of back pressure if your worried about loosing torque at all drop your pipe size to 2.25" this will give you more torque

[fatassgq]

Hi there Exhaustfix,
Just wanted to run a quick one by you.
I have a 4.8 Patrol and have just recently put a set of extractor and hi flow cat and exhaust on it. It is still waiting to get a resonator so is very loud but the problem I have is since having it fitted it has fucked the idle.

The motor is otherwise stock and never did this before.
After driving it drops idle down too low but then after a few secs it picks it back up then drops slowy again.

Any ideas. I was thinking maybe a sensor was affected after the extractors or maybe the extra heat. or maybe because it is so barky and poping etc it may have destroyed the brand new cat???

Any ideas appreciated
Cheers
Brian

[wrexed03]

Hi Exhaustfix just went through every post on this thread. Mate what can i say i am impressed with what i have seen so far.
Now to my question. I have a 2001 Pajero on dual fuel 3.5 v6 5 speed auto.
I have spoken to one of the local lads re my exhaust system i am looking at more low end power to mid not worried about top end as i dont give it heaps. I just want to improve overall drivability.
The local lad suggested to remove the front section of the exhaust from the back of the manifolds down to the cat and replace these pipes with 2.5 inch mandrel bend pipes. His reason was that the standard items dont flow very well. He has done this on a magna 3.5 and the customer was happy from what he tells me. Cost apx 360 dollars there abouts.
In regards to cat back what sort of system do you reccomend with this vehicle. There is a huge muffler up the front which im sure its a restriction in its self. Currently undler load the vehicle sounds like a vacume cleaner. Probably restricted.
Any recommendations greatly appreciated and pricing too please.
In regards to getting work done through your shop how long in advance should someone setup an appointment?

Best Regards
Wrexed03

[EXHAUSTFIX]

Hi there Exhaustfix,
Just wanted to run a quick one by you.
I have a 4.8 Patrol and have just recently put a set of extractor and hi flow cat and exhaust on it. It is still waiting to get a resonator so is very loud but the problem I have is since having it fitted it has ***** the idle.

The motor is otherwise stock and never did this before.
After driving it drops idle down too low but then after a few secs it picks it back up then drops slowy again.

Any ideas. I was thinking maybe a sensor was affected after the extractors or maybe the extra heat. or maybe because it is so barky and poping etc it may have destroyed the brand new cat???

Any ideas appreciated
Cheers
Brian

hi there
i wouldent want to even speculate on the problim
my sugestion is that u take it back to the shop that fitted it for you and ask them if they could get it checked out if you speek to them nicely and explain the problem and how its only happened since the exhaust was done u will proberly get a better result or take it to a dealer and get it put on an anilizer could be a throttle position switch

[fatassgq]

Cheers mate,
Yeah I will be doing that today. I don't anticipate any major probs.
Will just have to get some diagnostic tests done to see what going on.
My money is on a sensor or something somewhere.

Thanks

BTW cool idea with this post you are very helpful to a lot of people and I am sure they appreciate it.

[CHOPS1]

Just a quicky, i have a sierra 1.3. it has extractors and a 2" exhaust with hotdog. Will a straight through exhaust give me a bit more power?(it'll be for offroad/comp driving) even if just helping a little, its a gain i need! LOL

chop

[EXHAUSTFIX]

Just a quicky, i have a sierra 1.3. it has extractors and a 2" exhaust with hotdog. Will a straight through exhaust give me a bit more power?(it'll be for offroad/comp driving) even if just helping a little, its a gain i need! LOL

chop

straight through with in reason

what u have is not enough backpressure for such a small engine i would add a straight through muffler as well you will loose low down power with just a hot dog

[wrexed03]

Hi Exhaustfix.. Any reccomendations for my 3.5 pajero a few posts up.

Regards

[macca81]

hey EXHAUSTFIX, i have an 81 SWB MQ patrol, SD33 engine, would running a 2.5 zorst in a straight line from engine to rear make much dif? or is it just gunna mean i wont use as much pipe?:P hole in current one and was thinkin bout replacing the lot...

cheers mate,
macca

[EXHAUSTFIX]

Hi Exhaustfix.. Any reccomendations for my 3.5 pajero a few posts up.

Regards

hi there
a 2.25" system from cat large straight through muffler and large resenator on the rear good power gain and slighr economy gain

[EXHAUSTFIX]

hey EXHAUSTFIX, i have an 81 SWB MQ patrol, SD33 engine, would running a 2.5 zorst in a straight line from engine to rear make much dif? or is it just gunna mean i wont use as much pipe?:P hole in current one and was thinkin bout replacing the lot...

cheers mate,
macca

with straight through mufflers u need some bends in the pipe to create some backpressure

[macca81]

damn, more pipe, cheers mate

[PGS 4WD]

Is there any way of getting more low end torque through a VX Commodore V6 by longer runners or whatever? Not fitted yet, but looking at options when the day arrives (in about 3-5 weeks)

hi there
the best thing i have found for a commodore is good extractors into twin cats and a 2 inch twin system into a single 2.5:rear
this seams to work very well

i hope this helps

If your happy to run premium, you can remap the memcal to give more torque/power and economy through additional timing, get it done real time though not off the shelf.

[mrmagoo]

Hey mate you seem real busy......
quick one for you. Got a zook 1.3L with a webber and standard exhaust. want it to breath a little better.will it be ok keepin the standard engine pipe and adding a 2" system with hot dog and resonator or will i have to add extractors? will this pipe be enough or too much? Just want it to breath on a budget.
cheers mate

[beretta]

Hi there,

Can you recommend anyone in Sydney to do a 3" pipe from the dump back on a GQ LWB Wagon, and how much should I expect to pay for a quality job?

Thanks for the help!

Cheers, Paul

[rezpkt]

Hey Ross, have just finished reading through this whole thread amazing effort greatly appreciated!

Now down to business, I have 93 80 Series Std DIESEL.

Am looking at fitting extractor in near future with 2.5" mandrel bent straight through muffler to run along inside of chassis rail due to future custom rock sliders to bolt around/onto chassis.
What brand extractor works well, and what to stear clear of?
Is it worth going 2.5 as the standard exhaust is already 2+1/4 and am happy to cut out middle muffler..

I'm after noise but dont want to loose out on power and backpressure etc.

I have been quoted $1,000 for 2.5 mandrel straight through muffler and extractors (will have to enquire as to what brand extractors they where again) but if you can beat this price you have the job

My mate also has 93 80 series GXL PETROL and we will both be upgradeing at the same time i would say.
Query, his being petrol with alot more boot, is he able to go 3" without looseing power?

Thanks in advance, Glen.

[Struth]

G,day again. Thanks for the info on my extractors and pipes for the V6 Runner.

I drowned the engine (very upset about that) so picked up a VT V8 to replace it with (not so upset about that).

The standard exhaust manifolds won't fit real well. I have heard that SS block hugger headers exist, is this true.

If not what might be a good set of headers to start modifying to fit.

Cheers.

[macca81]

if when in a tight spot, i was to back into a mound of dirt or be in some situation like that where the exhaust is blocked, is that gunna do nethin bad to my engine?

if so, would fitting twin exhausts, one on each side ov the vehicle, be of any help??