Drivetrain Megan header installed. Power loss

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Aug 28, 2006 | 04:39 PM

coloradomini

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Megan header installed. Power loss

I have a stock 04S JCW. I installed a Mini Madness CAI. Worked great power was up noticable. Last night I installed a Plio / megan header powder coated with the test pipe provided. Power seems way down. No snap at 5,000 rpms any more just lots of noise. Anyone have any thoughts?

Aug 28, 2006 | 05:35 PM

DarkMiniCooperS

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From: Quebec City, Qc

That is weird...

It should not make a huge difference, but it should help...

Aug 28, 2006 | 05:50 PM

ThumperMCS

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From: OC, CA

Power lost??? Hmm, the second I drove my car after the header was installed it was very noticeable. Midrange torque added is significant.

Aug 28, 2006 | 06:29 PM

kyriian

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From: Toronto, ON

did you have a test pipe or a cat? because chances are if you have a race pipe, the power loss below 6k is understandable.... car will ONLY start feeling powerful beyond that point in a straight through exhaust....

otherwise... no idea... i have my obx in and since i've enjoyed more spirited mid-range... and an awesome sound!

Aug 28, 2006 | 07:04 PM

TampaMCS

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From: Tampa, FL

yep, put a cat in it...You do need some backpressure to keep torque up down low....

Aug 28, 2006 | 07:56 PM

nypepper

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From: Babylon NY

did you check for leaks

Sep 7, 2006 | 09:51 PM

coloradomini

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Okay got it figured out went over to my dealer today and he sorted it all out. And man does it run good. oh happy day

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Sep 7, 2006 | 10:28 PM

kurvhugr

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From: So. Maryland, USA

Quote:

Originally Posted by coloradomini

Okay got it figured out went over to my dealer today and he sorted it all out. And man does it run good. oh happy day

So, what did the dealer do?

Sep 8, 2006 | 04:24 AM

dmh

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From: Metro NY

Quote:

Originally Posted by TampaMCS

yep, put a cat in it...You do need some backpressure to keep torque up down low....

Not exactly. Under vacuum, yes; positive pressure, no.

Sep 8, 2006 | 07:12 AM

#10

etalj

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Quote:

Originally Posted by TampaMCS

yep, put a cat in it...You do need some backpressure to keep torque up down low....

this is a myth....backpressure doesn't actually give torque down low. However it's not completely untrue....basically you don't get the scavenging effect with a large diameter exhaust at low rpm (gas velocity is too low). Basically when the exhaust flow is not high (i.e. at low rpm) this usually means that a higher backpressure is preferred to make gas flow fast.

Sep 8, 2006 | 11:12 AM

#11

norm03s

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From: Ellicott City, Maryland USA

Quote:

Originally Posted by coloradomini

Okay got it figured out went over to my dealer today and he sorted it all out. And man does it run good. oh happy day

What did the dealer do????

Sep 8, 2006 | 01:57 PM

#12

herbie hind

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Quote:

Originally Posted by norm03s

What did the dealer do????

really dude this is cruel to say the least.(can you believe it ? this is what these little cars do to people ; i'm sitting here wanting to know what some dealer did to a guys car in colorado for gods' sake !!).

Sep 8, 2006 | 02:57 PM

#13

DrPhilGandini

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From: Albuquerque New Mexico

Me too! What *could* the dealer do to an installed header to give you all that power back? Did you have the gasket in upside down? Inquiring minds need to know...

Sep 8, 2006 | 03:19 PM

#14

coloradomini

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Okay sorry. When I installed the header the precat 02 was rubbing on the insulation thus shorting it out. The dealer reposition the hole so the 02 would not rub. Replaced the 02. And some remapping and WOW is all I can say.

Sep 8, 2006 | 04:12 PM

#15

herbie hind

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Quote:

Originally Posted by coloradomini

thank you . i can sleep now .

Sep 8, 2006 | 04:47 PM

#16

kurvhugr

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From: So. Maryland, USA

Your dealer did "some remapping"? Do you mean flashing the lastest version of ecu s/w or did they actually do some sort of custom work.....not something I would expect from a dealer.....

Sep 8, 2006 | 05:10 PM

#17

coloradomini

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Quote:

Originally Posted by kurvhugr

Your dealer did "some remapping"? Do you mean flashing the lastest version of ecu s/w or did they actually do some sort of custom work.....not something I would expect from a dealer.....

From what I got from it was reflashing to compensate for the headed. I am scheduled to get remapping with Mr. Webb. I may cancel that appointment. Not sure the car can run any stronger or better. The header does make a difference. Mid range is stronger then the hit at 5,000 rpm is like a blast off. I wish I would have had this a MTTS.