RPi Headers/Exhaust Manifold: Get Smog? - Page 2 - BMW M5 Forum and M6 Forums

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M5 E60 Group Buy Forum and Sponsor Discussion and Offerings Only Sponsors are allowed to post there offerings or one-time member offerings (That is one single and first group buy for a non-sponsor company's product). Members are allowed to post here as well.


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Old 14th April 2008, 23:30   #11
Dick Fidd
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Sorry to bombard, but I also have a Q...

Can you quantify the benefit of removing this cat versus the secondary cat?

I understand this will be better because the gasses are hotter and more voluminous closer to the heads, but in RWHP - delete primary cat versus delete secondary cat - what's the difference?

Gracias chicos.
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Old 15th April 2008, 03:58   #12
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We've never tested the headers with the Dinan SW so I cant tell you exactly how it will perform. The header package will include EVERYTHING you need to bolt on to your engine. You wont need to weld bungs or make your own o2 connections. The headers will install like stock so any aftermarket section 1s that bolt on to your stock headers will work fine.
The primary and secondary cats are really different so comparing the two for performance is kinda tough. We have not seen any significant gains by removing the secondary cats though. We will be posting dyno sheets soon.
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Old 15th April 2008, 20:20   #13
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Dyno numbers??

How much rear wheel HP and torque increases are expected from your modified headers over stock?

How does the power characteristics compare to the long tubes such as Evosport?

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Old 15th April 2008, 20:26   #14
Dick Fidd
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I bet +34HP/23TQ to the wheels on the stock tune with the 2nd cat intact - maybe a bit more if you have an intake mod - bump for dyno...?
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Old 15th April 2008, 23:02   #15
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We will be posting dyno numbers soon. I'm trying to work on something that would eliminate the CEL without software. Once that is done, we will put the car on the dyno.
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Old 16th April 2008, 00:01   #16
///Marshall
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Quote:
Originally Posted by RPIpower View Post
We will be posting dyno numbers soon. I'm trying to work on something that would eliminate the CEL without software. Once that is done, we will put the car on the dyno.
Are you testing on Gabe's car? Or perhaps Baller?
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Old 16th April 2008, 00:36   #17
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Are you testing on Gabe's car? Or perhaps Baller?
Its going on the shop car or Gabes car. Maybe we can have a dyno day when we put this thing on the dyno?
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Old 16th April 2008, 05:35   #18
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Very cool and innovative idea. I like it a lot.

Also, how is it possible to elimiate the CEL without software?

The DME is camparing the voltages on the o2 sensors before cat and after cat, and based on the difference between the two, it throws a light or doesn't. Are you talking about using o2 simulators or something like that?

PS: On a side note, will the RPI M5 pulley work on my 08 M3? Same engine, different crank and two less pistons. Maybe it's the same thing??

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Old 16th April 2008, 06:19   #19
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off topic... but eloy... are you guys going to have a presence at bimmerfest?
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Old 16th April 2008, 08:49   #20
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Are you testing on Gabe's car? Or perhaps Baller?
Patiently waiting....... waiting........... waiting!

Oh, did someone mention and EXHAUST SYSTEM?
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