Thread: To go straight through or not??

I saved this off the Lancer Forum many moons ago. I can't vouch for everything he wrote, but some of it might help with your queries, esp. backpressure. I'm sure the more knowledgeable ones here will be along soon enough to give you a definitive answer.

Originally Posted by 1nando

Okay, so ive got a 2.2 110 puma. It has a Bruce Davis alive tune and bigger cooler and egr removed.

Now i was reading the Bowler defender specs and they have a stainless steel 3inch exhaust. I currently have the standard exhaust system with the egr blanked, decat, and rear muffler removed. I only have the centre muffler left on.......

My question is whether to remove the centre muffler or not?

I have done many google searches on vgt turbos and exhaust back pressure and cant find any negative info against the idea. My reasoning is to reduce any potential egts, quicker spool with greater torque......

Thoughts welcome

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Straight through with decat on a puma is reported (by BAS from memory) to risk turbo over speed/clipping.

For this reason I went straight through but kept the cat - nice note, heat wrapping to reduce cabin heat and is nice and neat under the truck too.

I wouldn't go straight through because of the drone. Pat

Originally Posted by n plus one

Straight through with decat on a puma is reported (by BAS from memory) to risk turbo over speed/clipping.

For this reason I went straight through but kept the cat - nice note, heat wrapping to reduce cabin heat and is nice and neat under the truck too.

I dont ubderstand the turbo oveespooling as the actuator is electronically controlled.

I have a drag racing background, my understanding has always been, and this is a simplistic way to put it:

The quicker exhaust gases are removed from the engine the greater the amount of air you can get into an engine thus producing more power with lower egts.

The other thing is, how would a straight through 2 and 1/4 inch pipe make a turbo overspool but not a 3 inch pipe like on the bowler defenders when they are using standard turbos?

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Originally Posted by PAT303

I wouldn't go straight through because of the drone. Pat

I could put a hot dog in it to reduce noise whilst still increasing flow....



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my hotdog just fills up with soot. Would use just a straight pipe next time. only replaced the centre muffler due to fatigue cracks.

Originally Posted by dromader driver

my hotdog just fills up with soot. Would use just a straight pipe next time. only replaced the centre muffler due to fatigue cracks.

Do you mean you replaced the centre muffler with a hot dog?

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Originally Posted by 1nando

I dont ubderstand the turbo oveespooling as the actuator is electronically controlled.

I have a drag racing background, my understanding has always been, and this is a simplistic way to put it:

The quicker exhaust gases are removed from the engine the greater the amount of air you can get into an engine thus producing more power with lower egts.

The other thing is, how would a straight through 2 and 1/4 inch pipe make a turbo overspool but not a 3 inch pipe like on the bowler defenders when they are using standard turbos?

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Dunno, only report what I found in my research.

Maybe give it a go and find out? A replacement hybrid isn't that dear?