Is a 3' exhaust system worth the money

[vxcruiser08 Senior Member Find all posts View Profile Close vxcruiser08]

That's right a lot of people will drive harder because theres more power and you can hear the exhaust and and so on = using more fuel... a common problem with us blokes.

I drive like a grandma and would be interested to see once i get an exhaust what difference it makes. Still not sold on these pedal torque things... yes the website is missing info, their brochure has it that I picked up from ARB i threw it out though to avoid temptation

[rorza Member Find all posts View Profile Close rorza]

Sounds like the pedal torque things are a lot like the windbooster/throttle controller gadgets. Name of the product is misleading as I don't think they increase torque but alter the throttle response so that torque/power comes on quicker. It's a good feeling though driving a two tonne plus vehicle that gets up and boogies off the lights faster than most other cars

Would be interested in exhaust/chip/throttle controller combo. Any one on this forum have this set up?

[Dueler120 Senior Member Find all posts View Profile Close Dueler120]

Sounds like the pedal torque things are a lot like the windbooster/throttle controller gadgets. Name of the product is misleading as I don't think they increase torque but alter the throttle response so that torque/power comes on quicker. It's a good feeling though driving a two tonne plus vehicle that gets up and boogies off the lights faster than most other cars

Would be interested in exhaust/chip/throttle controller combo. Any one on this forum have this set up?

I put a Sprintbooster on top of my Steinbauer and Manta 3". It definitely brought on the throttle allot quicker but the sacrifice was the fuel economy went out the window and it caused my cruise control to stop working. Even on the lowest setting it came on very strong but in the end i disconnected it as I opted for a bit of mechanical sympathy. I don't think a vehicle that heavy could last very long being driven from a standing start as it was with that setup.

Cheers,

[vxcruiser08 Senior Member Find all posts View Profile Close vxcruiser08]

I believe it would be the same as the windbooster yep except the pedal torque costs more ($495).

I still don't understand how a pedal device would safe fuel.

[rorza Member Find all posts View Profile Close rorza]

So you found with the chip and exhaust there was no need for the sprintbooster? Did the exhaust/chip combo outweigh the sprintbooster only benefits?

I put a Sprintbooster on top of my Steinbauer and Manta 3". It definitely brought on the throttle allot quicker but the sacrifice was the fuel economy went out the window and it caused my cruise control to stop working. Even on the lowest setting it came on very strong but in the end i disconnected it as I opted for a bit of mechanical sympathy. I don't think a vehicle that heavy could last very long being driven from a standing start as it was with that setup.

Cheers,

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

G'Day mate,
Why is a 3in exhaust too big?
How do you loose power?
Why a 2.5in exhaust and
What airfilter are you refering to?

Cheers.

3 inch is too big because you loose back pressure, hence in turn you loose power.
There are many types of air filters on the market, (ie,K&N), that provide better filtration and better airflow, if you get better airflow you can get a better air/fuel mix thus giving a bigger bang, this will increase power if you can get the exhaust to match the flow.

[Mattyzvx Junior Member Find all posts View Profile Close Mattyzvx]

Hi Guys, I have a 3" manta exhaust and a DP Chip ( set on 6) definitely notice the increase in power, toque even with the chip set on setting 1 , slight increase in fuel economy. We haven't towed with it yet but will be once we get our camper next week.

[Corigator Avid PP Poster! Find all posts View Profile Close Corigator]

Croozza - Are you sure that we need back pressure in a diesel? I thought 2 strokes needed that. Isn't it more that you need a matched exhaust so the resonant frequency matches the preferred rev range to suck out the exhaust?

Why do extractors etc work well - drag cars (not diesel I know) have precious little exhaust to reduce back pressure.

Just wondering

[winniliss Avid PP Poster! Find all posts View Profile Close winniliss]

3 inch is too big because you loose back pressure, hence in turn you loose power.
There are many types of air filters on the market, (ie,K&N), that provide better filtration and better airflow, if you get better airflow you can get a better air/fuel mix thus giving a bigger bang, this will increase power if you can get the exhaust to match the flow.

With a diesel motor you only require minimal to no back pressure. 3in on a Prado will be fine. The turbo will spool up quicker resulting in less lag and a little more power and the engine will run cooler. Depending on what mufflers people get will dictate if they get the "drone" noise or not. I have a 3in exhaust, did notice less turbo lag, better power, slightly better fuel figures and cooler temps (run an EGT gauge).

K&N filters are good unless you oil them too much. The Toyota ones are fine and easier to use. You can go through http://www.amayama.com/ for a better price.

[wholesalesuspension Advanced Member Find all posts View Profile Close wholesalesuspension]

Why do extractors etc work well - drag cars (not diesel I know) have precious little exhaust to reduce back pressure.

Just wondering

Extractors work great on non turbo diesels as they do for petrol engines.

As for this thread. If it was my money, i'd just go the 3 inch and i did.
Dead quiet still, increased in low/mid range power &revs more freely.

Regards, Jason.

[pete8205 Member Find all posts View Profile Close pete8205]

drag cars have a rather large blower sitting on top of the engines to push the fresh air in
with turbo's it's much the same the more free flowing the better

If your going to do the exhaust make sure you do the dump pipe as well that's were most of your gains will be.
pete

[BB84WA Junior Member Find all posts View Profile Close BB84WA]

I recently installed a 3 inch Manta exhaust on my 120 D4D and a Unifilter. Being a 2 tonne car, wasn't expecting it to get a huge turn of speed. It is definitely a lot more drivable with the boost coming on almost as soon as you press the gas. I have an off-road Jayco Eagle at about 1.5T fully loaded. It seems to tow easier, holding higher gears now and making hills easier. No noisier inside than stock. Worth the cost...it does everything I expected it to so can't complain.

As said a few times, make sure any upgrade includes the dump pipe.

[clarkie383 Member Find all posts View Profile Close clarkie383]

As all have said above there are worthwhile gains with a bigger exhaust.
I fitted a Scotts Rods 3" to my 90 and its the best thing i could of done.
More torque and power.
The car was good but i felt it was a bit sluggish overtaking and on hills.
It is a little louder but barely noticable and no droning at all.
Fantastic now that it can breathe and is awesome on hills.
$835 delivered.

[SWR Banned Find all posts View Profile Close SWR]

Hi guys

If you go a bigger exhaust diameter you "WILL" loose mid range/cruise which is where your max torque sits.

People always seem to mix back-pressure up with exhaust scavenging/terminal velocity?

Terminal velocity/ exhaust scavenging is where there is a vacuum created in the exhaust that increases exhaust gas flow!

Back pressure is where there is a resistance in exhaust gas flow! (pulse fades/ Gas flow slows down & back-pressure increases).

If exhaust pulse fades it "WILL INCREASE" exhaust back pressure.

Big bore also tend to drone on cruise & a mid range flat-spot tends to appear on mid range.

Here is an old thread i written in 2012 below! ... Click on link!

Advice on exhaust system for GRJ120 in SA.

cheers

[photoprado Avid PP Poster! Find all posts View Profile Close photoprado]

Are you suggesting this for turbo or non-turbo.

AFAIK turbo's change these rules, and there is a benefit across the rev range from low resistance exhaust. (ie. 3")