Honda B20 Top Speed only 120KM after with Mugen Twin Loop Rep

[dantei136]

Hello All SIFUS brother & sister.
Here I am facing a big problem with my car after get installed Mugen Twin Loop Replica Muffler on my car Honda CRV which is STOCK B20 Engine.
After get installed the muffler...It feels very heavy to accelerate and soon I test my car top speed at highways this morning at about 4.00 AM I ONLY CAN REACH 120KMH!!!
Before this I am easily get 170KMH...and sometime get 18oKMH on VERY straight long highway.
What is actually the problem of my car.

Oh my car is all STOCK but last two month I did cut the Catalyst Converter and replace it with straight pipi...so what is left is (EXTRACTOR -PIPES-RESONATOR BOX-MUFFLER) ALL STOCK
And yes I did get some improvement from it!!

But now after I installed a MUGEN TWIN LOOP REPLICA MUFFLER my car turn to be heavy to accelerate
and the TOP SPEED ONLY 120KM AND CANT GO BEYOND!!!

Is it really because of I dont have the Catalyst Converter for BACK PRESSURE work properly with the
MUGEN TWIN LOOP REPLICA MUFFLER ????:rolleyes:

Do I have to buy a new Catalyst Converter so that I can get on my TOP END BACK or do I have to just replace it back with my UGLY STOCK MUFFLER ???

IS IT THE MUFFLER PROBLEM OR I DONT HAVE CATALYST CONVERTER??

PLEASE I AM REALLY IN A BIG HEADACHE

 

[123]

change back to previous muffler or go back to that shop, problem settle

 

[nyantong]

Sounds to me either the new muffler is causing the exhaust gas to flow out slowly rather than quickly. This is related to the "back pressure" , in which case yours is lacking pressure. Time to use back stock or use a smaller or s flow muffler

 

[dantei136]

Sounds to me either the new muffler is causing the exhaust gas to flow out slowly rather than quickly. This is related to the "back pressure" , in which case yours is lacking pressure. Time to use back stock or use a smaller or s flow muffler

change back to previous muffler or go back to that shop, problem settle

If go back to the shop they will most properbly suggest me to buy and add something bla bla bla..from them...
Is there any chance or ways to overcome this such problem without remove the muffler and replace the stock one ?
it such a waste if I just change back to the stock one bro...

Is my exhaust system not good or should I get catalyst converter install on my exhaust system since I've remove it...
I just curious why is most people car work just fine with this exhaust without any problem as mine?
I see even unmodified Proton Wira use this exhaust perfectly and simply improve their performance...

 

[DanzEterna]

test it for a few days, let the exhaust tune itself......
if after a week still no progress, replace back your cat con.

dun tell me u left your cat con at the exhaust shop....

 

[nyantong]

Others may have tuned their intakes to match their exhaust. Or they did not remove their cat, hence the back pressure still high regardless of the muffler. In your case, your exhaust set up is considered to be straight pipe with very little restriction especially after installing your new muffler.

 

[dantei136]

test it for a few days, let the exhaust tune itself......
if after a week still no progress, replace back your cat con.

dun tell me u left your cat con at the exhaust shop....

So now I have need to give it sometime so that the exhaust can tune itself?
If still the same...replace back cat con to the exhaust system...will the back pressure increase hence the gas flow is high and I can get to my Top Speed as normal ?

Oh I kept the cat con in hand and dont know it is still fine or should I replace to new on ?

---------- Post added at 01:30 PM ---------- 6 hour anti-bump limit - Previous post was at 01:23 PM ----------

Others may have tuned their intakes to match their exhaust. Or they did not remove their cat, hence the back pressure still high regardless of the muffler. In your case, your exhaust set up is considered to be straight pipe with very little restriction especially after installing your new muffler.

Sorry I am noob...
tune their intake to their exhaust...it is intake inside the muffler or intake system of my car?
About the cat I've removed mine long time ago...or is it the cat inside the muffler bro?

Yup mine is considered to be straight pipe and have little restriction after new muffler...
So doesn't it makes the back pressure is low for gases to flow since I have a little restriction?
The best bet is to install back my Cat Con ??

 

[nyantong]

Intake is the air intake system consisting of all the components before the intake valves; ie : air filter, ram pipe, air flow sensor, manifold, throttle body. By tuning the intake to match the exhaust, you get better power.
As for your straight flow exhaust, there's too little back pressure which causes exhaust gas flow to flow outslowler than your stock muffler. This is detrimental to the scavenging process happening in your combustion chamber. Hence loss of power.

 

[peeche]

first.. tro to reset your ecu.. maybe by pulling out the battery terminal overnight..

secondly.. try to add a center box / bullet to replace "cat converter" that you have thrown out..

 

[dantei136]

Intake is the air intake system consisting of all the components before the intake valves; ie : air filter, ram pipe, air flow sensor, manifold, throttle body. By tuning the intake to match the exhaust, you get better power.
As for your straight flow exhaust, there's too little back pressure which causes exhaust gas flow to flow outslowler than your stock muffler. This is detrimental to the scavenging process happening in your combustion chamber. Hence loss of power.

So now I need to install bullet to replace the cat con or by simply install back the cat con on the system so that I get increase back pressure for the gas flow out fast to gain my power back isn't bro?

Ok I see...But how to do tuning for intake?
where can I get tuning service in Ampang area and the price to do tuning intake is how much bro?

---------- Post added at 03:04 PM ---------- 6 hour anti-bump limit - Previous post was at 03:01 PM ----------

first.. tro to reset your ecu.. maybe by pulling out the battery terminal overnight..

secondly.. try to add a center box / bullet to replace "cat converter" that you have thrown out..

BrO I've disconnected my battery terminal for overnight yesterday...
Now this morning it's still the same...car slow like hell even kancil can get pass me easily...

Is the solution is to add bullet to be replace the Cat Con?
Where can I get better bullet and what brand bro?

 

[^pomen_GTR^]

throw away la that twin loop muffler....

 

[ken yeang]

why you hand itchy in the first place??

 

[dantei136]

throw away la that twin loop muffler....

Haha it such a big money for me bro to throw away this muffler even thou it's replica not original...
Any recommendation bro to solve this problem with this muffler to work finely ?

---------- Post added at 04:46 PM ---------- 6 hour anti-bump limit - Previous post was at 04:43 PM ----------

why you hand itchy in the first place??

Haha I just want to make my car a bit of sport sound and gain some power at top end...

 

[peeche]

BrO I've disconnected my battery terminal for overnight yesterday...
Now this morning it's still the same...car slow like hell even kancil can get pass me easily...

Is the solution is to add bullet to be replace the Cat Con?
Where can I get better bullet and what brand bro?

i've de-cat my v6.. no noticeable power loss.. but the exhaust sound annoyed me.. so i replace it with a center bullet..

same story with my neo auto.. replace my cat-con extractor with de-cat 4-2-1, annoying exhaust note.. low end power quite lemau but quite nice on high rpm.. so i add on another center bullet and it improved the low end power and makes the exhaust note sounds even better..

 

[^pomen_GTR^]

Haha it such a big money for me bro to throw away this muffler even thou it's replica not original...
Any recommendation bro to solve this problem with this muffler to work finely ?

---------- Post added at 04:46 PM ---------- 6 hour anti-bump limit - Previous post was at 04:43 PM ----------



Haha I just want to make my car a bit of sport sound and gain some power at top end...

errr..no i mean maybe that twin loop muffler not suitable for your engine...maybe its chocking the exhaust flow....so try have another test with straight flow exhaust first....

 

[dantei136]

i've de-cat my v6.. no noticeable power loss.. but the exhaust sound annoyed me.. so i replace it with a center bullet..

same story with my neo auto.. replace my cat-con extractor with de-cat 4-2-1, annoying exhaust note.. low end power quite lemau but quite nice on high rpm.. so i add on another center bullet and it improved the low end power and makes the exhaust note sounds even better..

Haha yup bro...same goe to me...It sound so horrible it's like the exhaust piping vibrating when we accelerate...But is there any power loss when decat while having aftermarket muffler bro ?
If it is the cause I will simply get the bullet install on the exhaust system...?
MY FC IS BAD FOR THIS WHOLE WEEK BECAUSE I'VE NEED TO HIT THE PEDAL TO A BIT MORE THE USUAL BECAUSE IT'S HEAVY WITH THIS MUFFLER...

---------- Post added at 09:04 PM ---------- 6 hour anti-bump limit - Previous post was at 08:56 PM ----------

errr..no i mean maybe that twin loop muffler not suitable for your engine...maybe its chocking the exhaust flow....so try have another test with straight flow exhaust first....

Oh yaa I was thinking the same thing when it was happens at first...or it because the muffler need a bit more back pressure in order the muffler to work well since I've decat mine bro??

Yeah need to test with some straight flow exhaust this saturday when I came back to KL...but will it be sound loud with straight flow muffler ?
I'm afraid that my car will sound like some of those prangg sound...I do really like that such sound but my car is not that type of EK's and EG's it a BIG FAT CRV...hahhaaha.
Afraid of people will laugh at me seeing a prangg CRV...HAHAH

 

[AE75]

I think the muffler pipping inlet too big. Perhaps shift to others exhaust workshop for listen to 2nd opinion.

 

[arturo]

twinloops are supposed to switch from sflow to straight flow at a predetermined pressure which corresponds to a certain RPM (normally open to straight when vtec engages). did u hear any difference in exhaust note thruout yr rpm range?

but first of all...ori twinloop? no matter how lousy the muffler, it should not affect yr top speed by that much...

 

[Izso]

twinloops are supposed to switch from sflow to straight flow at a predetermined pressure which corresponds to a certain RPM (normally open to straight when vtec engages). did u hear any difference in exhaust note thruout yr rpm range?

but first of all...ori twinloop? no matter how lousy the muffler, it should not affect yr top speed by that much...

He said it's not ori. It's a replica. Meaning it's probably just a loop around the muffler to the exit. Ie- it's a straight flow.

CRV auto with almost no back pressure... bad idea.

 

[esthapo]

Disturbing the CRV's exhaust system is already a bad idea in the first place