RPi Headers/Exhaust Manifold: Get Smog? - Page 5 - BMW M5 Forum and M6 Forums

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Old 29th April 2008, 23:50   #41
RPIpower
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Quote:
Originally Posted by deknight View Post
Eloy looks like a good product. Looking forward to the dyno results. Btw, the crimps in the stock headers must be for a reason. I mean the M department did not do that to purposely make the headers have less power. They did it either for the purpose of maximizing EGV or fitament or another purpose I am not aware of. Bottom line is that they are equal length and as such they want to manage flow to maximize for the headers being equal length. What is your call on this Eloy?
You know we have been working/testing this project for some time. The bottom line is that the stock headers are pretty *****in. It would cost a LOT to build a header like the stock one. We'll have dyno number soon as we want to make sure the flanges and materials we use are up to the task. Havent talked to you in a while. How is your car running?
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Old 30th April 2008, 00:20   #42
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You know, RPI is suggesting that Header gains come from the primary cat delete. Even if they were the same as a complete header solution, this will really great due to the fact that the whole smog issue can be reversed w/o much labor costs.

I don't mind forking over the $$ for a better mousetrap, especially if it is OEM, produces the same gains and reversible... even if it involves less materials (vs complete headers). To me, that's just like paying for software upgrades... there are no parts... you are paying for R&D.

All things being equal (~same hp), the less aftermarket stuff and the more OEM stuff the better. Awaiting the dyno results...
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Old 30th April 2008, 17:12   #43
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Quote:
Originally Posted by RPIpower View Post
You know we have been working/testing this project for some time. The bottom line is that the stock headers are pretty *****in. It would cost a LOT to build a header like the stock one. We'll have dyno number soon as we want to make sure the flanges and materials we use are up to the task. Havent talked to you in a while. How is your car running?
Car runs awesome. Once I got the exhaust leak fixed (basically the secondary cat cover nailed something and pulled the passenger side cat from its seal) the car runs strong.

Once I get close to smog time very much considering your mod. I have my stock headers still. You always think out of the box Eloy and do it with intelligence. Great job again!!!
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Old 4th May 2008, 18:12   #44
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Should we not pass emissions with just the 2nd cat in place? As long as the car is warm, I would think it would be OK. Anyone have data?
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Old 5th May 2008, 18:04   #45
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Should we not pass emissions with just the 2nd cat in place? As long as the car is warm, I would think it would be OK. Anyone have data?
I doubt that a secondary cat only will pass a sniffer test. I believe
the primary cat is a 2-way cat (not sure which two emissions it's
cleaning up) while the rear is a 1-way.

If you don't get software or a rewire of your rear O2 you'll definitely
get a CEL. Even with software it sounds like there's still an internal
error that emissions testing will find. Darren_dallas went though
this and had to rewire his O2 to pass. He didn't have to do a sniffer
test which unfortunately we in CA need to do.
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Old 5th May 2008, 22:00   #46
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You haven't been at rpi recently huh? I'm very certain that rpi headers will not trigger CEL without prime cats. Go check it out yourself and u will know why. Hint:law of physics and nature of mass/particle.
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...
If you don't get software or a rewire of your rear O2 you'll definitely
get a CEL...
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Old 5th May 2008, 22:14   #47
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You haven't been at rpi recently huh? I'm very certain that rpi headers will not trigger CEL without prime cats. Go check it out yourself and u will know why. Hint:law of physics and nature of mass/particle.
Ahaaaa.......!

I know all about the "Law of Mass" from my Particle.

All I trigger is pleasure with some pain! No CEL, however, a lot of YELL!

I though RPI was a after market auto parts shop. Sounds like Fritz's! Do they require a 2 drink minimum?


You guys think your soo smart with your big talk!
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Old 5th May 2008, 22:29   #48
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Man!!! You are truely #1 as a "thread jacker" as Eloy refered. Hehehehehe

Quote:
Originally Posted by m5baller View Post
Ahaaaa.......!

I know all about the "Law of Mass" from my Particle.

All I trigger is pleasure with some pain! No CEL, however, a lot of YELL!

I though RPI was a after market auto parts shop. Sounds like Fritz's! Do they require a 2 drink minimum?


You guys think your soo smart with your big talk!
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Old 5th May 2008, 23:09   #49
///Marshall
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Quote:
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You haven't been at rpi recently huh? I'm very certain that rpi headers will not trigger CEL without prime cats. Go check it out yourself and u will know why. Hint:law of physics and nature of mass/particle.
Right. Maybe I was confused about the question. I assumed Dick Fidd
was asking about headers in general with the primary cat delete
and running only secondary cats.
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Old 5th May 2008, 23:16   #50
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Love the concept! This is exactly the kind of simple ingenuity needed. The sole reason I dont have headers is due to smog worries. I would buy these over other headers even if they made less power. The price does seem a little high but it is too early to judge.

When are they going to be available?
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