cat delete?
06-25-2018, 01:06 PM
#2
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Why do you want to do that?
What do you mean by "spice"?
Do you like to breathe? I know I do. As the name implies, a catalytic converter converts toxic gases that are emitted from your engine and converts them into less harmful gasses.
If your catalytic converter is working properly (i.e. the catalyst is not clogged or damaged), you should not gain anything from smashing out the catalyst other than breathing in more toxins.
What do you mean by "spice"?
Do you like to breathe? I know I do. As the name implies, a catalytic converter converts toxic gases that are emitted from your engine and converts them into less harmful gasses.
If your catalytic converter is working properly (i.e. the catalyst is not clogged or damaged), you should not gain anything from smashing out the catalyst other than breathing in more toxins.
06-25-2018, 01:34 PM
#4
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In that case, do you recommend an exhaust system to deepen its tone or make it not so quiet? I'm happy with with its performance, and don't want to hurt the engines longevity. But just looking for suggestions.
06-25-2018, 02:04 PM
#6
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You could get a good high flow muffler or for more noise maybe a cherry bombish muffler, the noise is up to you. Just remember it’s a 4 cylinder, noise in my Subaru is welcomed but personally in my truck I love it quiet and would hate to hear it rapping out every gear change.
I just went with a standard muff as even a high flow one is questionable on power gains, jump on you tube and search a bit, although you can never really judge the sound unless it’s in front of you might be able to get a better idea of the tone..
I just went with a standard muff as even a high flow one is questionable on power gains, jump on you tube and search a bit, although you can never really judge the sound unless it’s in front of you might be able to get a better idea of the tone..
Last edited by Discombobulated; 06-25-2018 at 02:06 PM.
07-02-2018, 12:25 PM
#7
Like I said in other thread, save money and buy a header.
Last edited by RAD4Runner; 07-02-2018 at 08:39 PM.
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07-02-2018, 02:43 PM
#8
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I should have given you my rusted out exhaust and muffler before I replaced it! 
The truck was quite loud (kind of a raspy fart-can exhaust sound). The truck sounded cool for all of five minutes. Then it got annoying.
A new muffler and exhaust would more likely give you the results you are looking for.
The truck was quite loud (kind of a raspy fart-can exhaust sound). The truck sounded cool for all of five minutes. Then it got annoying.
A new muffler and exhaust would more likely give you the results you are looking for.
07-05-2018, 10:02 AM
#9
Registered User
I'm pretty happy with my exhaust, Thorley header, hi-flow cat (mine was dead,) cat back exhaust and pro-flow muffler. Not overly loud, not ricey, just a nice rumble down low. Gets a little annoying when you rev it out, but after all it is a 4 banger.
07-11-2018, 05:18 PM
#10
Cats are needed for emissions tests. If you dont need to do such a test there is no need. The vehicle wont smell any different if your air fuel ratio is normal. This isnt a diesel. The stock oem exhaust is very weak. It should be 2.5" minimum. 3" cant hurt and theres plenty space for it. Cats, resonators.... Dont do much for sound. Mufflers take care of noise, a quality chambered muffler of adequate size will be quiet as stock. Do it all in stainless, and it will last.
07-11-2018, 06:09 PM
#11
Registered User
Where are you getting this information from?
My factory exhaust seemed pretty strong to me.... high quality for aluminized steel...
Bigger is not necessarily better.
There is a LOT of engineering that goes behind designing a proper exhaust system. You cannot simply slap a large diameter exhaust on and magically gain horsepower. You may actually lose performance if you are not careful. The exhaust system should be designed around the engine and the best balance of flow, scavenging, and exhaust velocity for the intended RPM range that the engine will be operating in the most. These factors will vary depending on if the engine is stock or modified.
07-11-2018, 06:49 PM
#12
Where are you getting this information from?
My factory exhaust seemed pretty strong to me.... high quality for aluminized steel...
Bigger is not necessarily better.
There is a LOT of engineering that goes behind designing a proper exhaust system. You cannot simply slap a large diameter exhaust on and magically gain horsepower. You may actually lose performance if you are not careful. The exhaust system should be designed around the engine and the best balance of flow, scavenging, and exhaust velocity for the intended RPM range that the engine will be operating in the most. These factors will vary depending on if the engine is stock or modified.
When it comes to exhaust bigger is better always. Actually less is better. Ideally the exhaust header would exit the hood or fender. Anything beyond that is a sacrifice for sound and pollution.
Its not that you’ll gain horsepower with a high performance exhaust. But rather, you’ll lose power by choking an engine. Even more important than power is exhaust gas temperature. More restriction and parts to push through causes more heat and more stress on the engine. I don’t run an egt gauge in my truck so I can’t comment on egt numbers but without a doubt the teeny tiny stock exhaust will be raising egt and reducing power when the truck is pulling weight or working hard.
take a look at a dragster running fast times. Take a look at a Peterbilt truck. Big flow, always. Engines are air pumps.
Aluminized is ok. Stainless is best.
Last edited by the171; 07-11-2018 at 06:51 PM.
07-12-2018, 07:26 AM
#13
Registered User
You're flat out wrong. Bigger is not always better when it comes to exhausts. If you're talking a turbo or diesel application then you want as free flowing as you can possibly get. On these 22r motors anything over 2.5" is going to rob you of some low end power.
07-12-2018, 08:48 AM
#14
I’m not one for online arguments and respect everyone’s opinion. But certainly I am not wrong. It’s been proven on dynos plenty, less restriction causes improved performance. There is no logical explanation for why a larger exhaust is not beneficial. It doesn’t matter if it’s diesel or a small or large gas engine. Like I said open header is ideal. Obviously that’s not practical. 3” is good, expect low egt. 2.5” is good enough though. It’s a low output motor.
07-12-2018, 01:17 PM
#15
Seriously a 3" exhaust on a 22r motor? 2.5" is the very biggest I have seen recommended. Most people find a happy place with 2" or 2.5". 3" would probably eliminate most of your bottom end power.
@the171. Please if you are going to give contradicting information to most everybody's experience with the 22r series motors could you please at least tell us your real experience with these motors? I will start, I have had a 85 22re pickup, 89 22re pickup, 93 22re pickup and now a 85 22re 4runner. My experience with this motor is still limited mainly because I have on fully rebuilt 1 and done head gaskets and timing chains on the others. Nor have I ever seen a dino sheet for one I have owned. However I have played with many different intakes and exhausts in the process and in all cases if your going to do something like a 3" or straight header you need to allow the motor to use it or you are just throwing money at something for giggles.
Most all of the 22re guru's LCE & ENGNBLDR both recommend 2.25" for best power and drivability.
@the171. Please if you are going to give contradicting information to most everybody's experience with the 22r series motors could you please at least tell us your real experience with these motors? I will start, I have had a 85 22re pickup, 89 22re pickup, 93 22re pickup and now a 85 22re 4runner. My experience with this motor is still limited mainly because I have on fully rebuilt 1 and done head gaskets and timing chains on the others. Nor have I ever seen a dino sheet for one I have owned. However I have played with many different intakes and exhausts in the process and in all cases if your going to do something like a 3" or straight header you need to allow the motor to use it or you are just throwing money at something for giggles.
Most all of the 22re guru's LCE & ENGNBLDR both recommend 2.25" for best power and drivability.
Last edited by thefishguy77; 07-12-2018 at 01:36 PM.
07-12-2018, 01:25 PM
#16
Originally Posted by the171
I’m not one for online arguments and respect everyone’s opinion. But certainly I am not wrong. It’s been proven on dynos plenty, less restriction causes improved performance. There is no logical explanation for why a larger exhaust is not beneficial. It doesn’t matter if it’s diesel or a small or large gas engine. Like I said open header is ideal. Obviously that’s not practical. 3” is good, expect low egt. 2.5” is good enough though. It’s a low output motor.
07-12-2018, 03:57 PM
#17
Ok guys play with your mini exhausts if you want. I like big and so do most who know what’s up. But everyone has their opinion, that’s what makes life interesting. To the op... Ditch the cat and up the flow it’s a worthwhile project. That’s all I got to say about it.
07-12-2018, 05:07 PM
#18
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Well that discussion degenerated quickly. Perhaps because it included those who announce their unsupported opinion, and when asked about it, insist "certainly I am not wrong." Why am I not wrong and others are? Because "im into exhaust and welding."
It may just be me, but if I was the one "into" a subject, I would be able to do the necessary calculations in my sleep (and could repeat them when called for). Short of that, I could cite to a half-dozen of the more respected publications. (A quick google search turned up
https://www.hotrod.com/articles/what...pes-work-best/
http://www.exhaustvideos.com/faq/how...pipe-diameter/
https://blog.tdotperformance.ca/guid...pipe-diameter/
I can't say that any of these are authoritative, but they do seem to back up their claims with calculations. Oh, and none of them buy into "bigger is always better.")
Or, I could just claim that "most who know what's up" agree with me. But that would NOT be advancing the discussion.
So let's try to keep it informative. I want to hear your opinion, but back it up!
It may just be me, but if I was the one "into" a subject, I would be able to do the necessary calculations in my sleep (and could repeat them when called for). Short of that, I could cite to a half-dozen of the more respected publications. (A quick google search turned up
https://www.hotrod.com/articles/what...pes-work-best/
http://www.exhaustvideos.com/faq/how...pipe-diameter/
https://blog.tdotperformance.ca/guid...pipe-diameter/
I can't say that any of these are authoritative, but they do seem to back up their claims with calculations. Oh, and none of them buy into "bigger is always better.")
Or, I could just claim that "most who know what's up" agree with me. But that would NOT be advancing the discussion.
So let's try to keep it informative. I want to hear your opinion, but back it up!
07-13-2018, 09:58 AM
#19
YUP.
Opinions without verification don't matter.
DYNO before and after will the fact.
I wonder how much shop would charge for this?
Anyone who's planning to mod the exhaust willing to do this?
Opinions without verification don't matter.
DYNO before and after will the fact.
I wonder how much shop would charge for this?
Anyone who's planning to mod the exhaust willing to do this?
Last edited by RAD4Runner; 07-13-2018 at 10:02 AM.
07-13-2018, 02:40 PM
#20
Registered User
There are formulas and books (plural) on engine tuning including exhaust system length and diameter. A friend of mine has/had the formulas on his computer (DOS) and we did the measurements and ran the numbers. When we ran the numbers for a big pipe on different small 4 cylinder engines the useful RPM range decreased as compared to the smaller pipes.
2 of the books are:
2 of the books are:
Scientific Design of Exhaust and Intake Systems (Engineering and Performance)
Performance Tuning in Theory and Practice, Four Strokes
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