Exhaust Pipe

[seanlee]

Hello. I'm using Wira Sedan manual 1.5 injection without engine modification.

Recently, i had upgraded my exhaust system. The modifications are:

1. 4-2-1 Extractor
2. Exhaust pipe 2" with bullet - According to the mechanic, the size is 2". (Manufactured for wira 1.5 with headers).
3. JamSpeed Twin-Tip S-Flow Muffler

I'm a little worried that you all said that the maximum exhaust pipe for 1.3-1.5 Wira is 1.78". What should I do? My fuel consumption is improving, and top-speed is increasing. Before changing the piping, I already installed 4-2-1 extractor, and when I change the exhaust pipe to 2" i've noticed that the car is much 'lighter' when i press the as pedal. Or is it just psychological effect?

On the other hand, i've noticed a 'preng' sound when i rev the car coming out from the muffler. Is it caused by stronger exhaust gas due to larger exhaust piping? What should i do? Should i installed another bullet with the existing bullet or discard the existing bullet and replace it with a new bullet that can absorb the 'preng' sound? What kind of bullet should i use? Normal bullet or spiral bullet? What is the advantage of spiral bullet? I'm still keeping the standard exhaust pipe with me.

Thanks.

when mech said is 2"..normally internal was 1.78"...so no worry

 

[popout]

tumpan tanya ya..
recenly my wira mivec is finish but wit ori 1.5 piping anyone can suggest wat kind of piping i need to mod or no need mod in addition my mivec is an auto trans. I don't like those loud sound so silent ,fuel saving and power( imposible la right??) is my aim.

 

[SkYwAlKeR]

tumpan tanya ya..
recenly my wira mivec is finish but wit ori 1.5 piping anyone can suggest wat kind of piping i need to mod or no need mod in addition my mivec is an auto trans. I don't like those loud sound so silent ,fuel saving and power( imposible la right??) is my aim.

2.0" would be nice for mivec 1.6....

 

[Malakian]

when mech said is 2"..normally internal was 1.78"...so no worry

Thanks seanlee. How about the 'preng' sound when i rev the car? The mech suggested to me to add another bullet to absorb the sound or retain the exhaust gas a little bit. What kind of bullet should i use? Normal or the spiral one? Where should i install the new bullet, just after the built-in bullet or alongway the built-in bullet? Thanks.

 

[dr.who]

Hey guys,

Just would to chip in...

I'm just curious why some cars have original / stock exhaust pipes bended downwards for eg: Toyota Vios.

Is there any advantage of this?

TQ.

 

[Malakian]

Hello. Any sifu here that can help me with the preng/tin can sound that my muffller produce. Is it caused by the muffler or the bullet? Need advice from you all. Thanks.

 

[avaultz]

since this topic is alive back..

i also wanna ask few question.

my car is wira gsr. engine is stock modification. so what is the best size for my piping... i scared those exhaust shop conn me.. haha
ty

 

[zero2hundred]

straight piping 2.5 from nanas to the muffler shud b okay kot for gsr... :P

 

[GT_AUTO]

Hello. Any sifu here that can help me with the preng/tin can sound that my muffller produce. Is it caused by the muffler or the bullet? Need advice from you all. Thanks.

usually the rear muffler that produce that sound.maybe built quality is low.

since this topic is alive back..

i also wanna ask few question.

my car is wira gsr. engine is stock modification. so what is the best size for my piping... i scared those exhaust shop conn me.. haha
ty

2.5" is suitable for ur engine.

straight piping 2.5 from nanas to the muffler shud b okay kot for gsr... :P

no need kot kot...hehehe...ur right mar.std gsr,2.5" is enough unless u modified
kaki.:)

 

[Malakian]

Brother GT_Auto, what brand of s-flow muffler that u recommend me to use. How about for below RM250 budget? Twin-tip maybe? Before this, i use stock wira muffler. after changing the piping, i heard 'preng' sound when i rev the car. then try ot install new stock wira muffler, but it still the same. then install this jamspeed twin-tip. Can you give me some advice to select the right muffler? Thanks.

 

[GT_AUTO]

look for a better built 1.single tip,twin tip,that's ur choice.

 

[RyanTham]

i just bought 1 pro-1 racing s-flow muffler...any comment bout this muffler.???
now i was wondering why my s-flow also produce such bassy sound and after i rev until 4.5k rpm...the sound getting more and more louder...after 4.5k rpm....it turns to no sound....weird weird...and comments?

 

[Malakian]

Ok, thanks GT_Auto.

 

[GT_AUTO]

i just bought 1 pro-1 racing s-flow muffler...any comment bout this muffler.???
now i was wondering why my s-flow also produce such bassy sound and after i rev until 4.5k rpm...the sound getting more and more louder...after 4.5k rpm....it turns to no sound....weird weird...and comments?

bassy is a good start.below 4.5k the exhaust flow is still struggling to exit from
ur exhaust system that's why the loud noise.after 4.5k,the exhaust gas become
smooth liow hence the lower sound.

 

[xinghonh]

bro i wud wanna chg my piping to 2.5" and end wid a 3 inch muffler for my 4g93p BOT
isit ok?