Quad Exhausts

That looks brilliant from the back, reeeeeeally nice proportioned pipes 8)

That backbox is big though and could easily (hopefully) contain two chambers, wether it does or not sounds like a mystery. :?

To compare it with my backbox size...
http://www.z4-forum.com/forum/viewtopic.php?f=2&t=6997&p=106536&hilit=exhaust#p106536
 
This really is purely a cosmetic set up. The back box will have a simple T pipe cut into and welded onto the side. I'd expect 75% exhaust to go to the left and a max 25% out the new outlet.

Forget performance gains, but it will look good

Sound will depend entirely on the baffle structure inside the box so it could be anything


If asking questions of the supplier find out exactly what they do to the RHS cutout. The left is neatly moulded so the cut out could look a mess.
 
Ok here’s the story so far regarding my intended Quad set-up. I visited Blueflame and told them of my intension to modify the battery compartment. If memory serves me correctly they said that the dimensions of the back-boxes would be approximately 7” x 5” and asked if I could provide as much room as possible.

I have been giving a lot of thought as to what battery to fit wishing to maintain the 80Ah currently fitted to my car. Despite extensive research I have been unable to match the Ah rating which concerned me. Therefore I have decided to turn my existing battery through 90 degrees and modify the spare battery box obtained from a breakers. The way I intend modifying the battery box is to maintain the flange at the top, therefore no need for plating the boot floor and to cut a section from the right hand side of the battery box (approx half the width) but leave the top 2” untouched hence creating a stepped floor the battery compartment if you follow. I am due to complete the mods to the battery box over the weekend and then need to alter the cabling to the battery. Once this is done I will have to decide on whether I go the blueflame route of fit M boxes. One other factor to consider when changing the back boxes is the loudness of the system. To put this in perspective Blueflame advised that if my present system has a score of 3 on the loudness scale, then their proposed system would score a 5. I hope this helps anyone considering such a modification.
 
The approach to the battery box is a good one. Couple of pointers on it 1) my exhaust actually brackets up to the new plating 2) It's hot and needs heat shielding up there. Aside that a great compromise as you keep the larger battery. My 60ah has had no trouble whatsoever through our vicious Winter and on a 3.0 auto is probably the toughest job it can have.

Don't forget you've also got to sort that carbon canister filter in the RHS rear corner out. That takes rear box space too and if not is not a good idea with petrol vapour next to the exhaust.
 
I just finished installing a Eisenmann quad exhaust on my US non-M 2005 Z4 3.0i. The fit is great, but I don't know where I can move the charcoal canister to. The US has a larger (longer) canister than the Euro version, some of which is attributed to a pump that the US models have. For those that have installed a dual exhaust, where has your canister been relocated?

One thing I've been considering is whether I can cut about 4 inches out of the middle of the canister. I realize the box has to be air tight, and believe that I can reseal it with either epoxy or fiberglass. While I know that the lower box contains a carbon filter, I'm not sure what the upper chamber contains (this is the section that feeds the pump).

Thanks,
David
 
peddy said:
Got some pics from them. Only the one backbox...

What do you guys think though. They look really good. Do you think i'll have exhaust smoke ratio and/or power loss issues as menioned before?

EDIT: Another M badge! :headbang: X2 Why put an M badge on it. the mod is very nice as is your car. It's embarrising to see.

z4quadehaust.jpg

z4quadexhaust2.jpg
Click to expand...
 
dyerkes said:
I just finished installing a Eisenmann quad exhaust on my US non-M 2005 Z4 3.0i. The fit is great, but I don't know where I can move the charcoal canister to. The US has a larger (longer) canister than the Euro version, some of which is attributed to a pump that the US models have. For those that have installed a dual exhaust, where has your canister been relocated?

One thing I've been considering is whether I can cut about 4 inches out of the middle of the canister. I realize the box has to be air tight, and believe that I can reseal it with either epoxy or fiberglass. While I know that the lower box contains a carbon filter, I'm not sure what the upper chamber contains (this is the section that feeds the pump).

Thanks,
David
Click to expand...


Mine is still on the bench since I did the conversion over a year ago. I simply removed the canister and various pipes to the filler at the time of installation, plugged up the pipe that runs to the engine and had run it ever since with zero effect. It's been through it's emission tests too. My plan was to fit it centrally where there is a larger gap left by the now smaller box on the LHS, but never felt the need.

I believe on the EU model the canister is purely for a test that has to be conducted in a selaed room that tests emisions when the car is warmed up and thus fuel expands and vapour pushed out. I could be wrong on that and welcome correction
 
dyerkes, excellent work sir :thumbsup:

Which did you go for, stock, sport or race?

Reference your question, I don't have CJ's level on knowledge, but I do have a picture of the underside of mine... click the Exhaust link on my signature.

Mine is the sport system, now with a little over 1000 miles on it and it's running really well across the rev range. Reverberation at 2k RPM has stopped.
 
Thanks pawnsacrifice. I went with the sport version as I was concerned as to how loud or resonating the race ones might be. While the sport version is a little louder than the stock muffler, and it does offer a mild amount of gurgling, it's a little tamer than what I was hoping for. In listening to your recordings, I would have liked it to be closer to yours. I have no complaints at all with regards to fit and finish with the exception of where I can relocate my charcoal canister. In reviewing the photos of you exhaust, it appears that your charcoal canister is still in place. This is what I thought, since I didn't think Eisenmann would have produced it without having addressed the fitment for at least the European models. As I indicated before, the US version of the canister is about 4" longer than the European version, and therefore it inteferes with the location of the new exhaust piping on the right-hand side of the car. While it may be possible for me to install a Euro version of the canister on mine, I believe mine would still be giving me an error code since I will have no where to plug the electrical connection that had previous operated the leak detection pump.

cj10jeeeper, for the time being I plugged all the hoses that ran to the canister and other than a warning light now appearing, the car runs great.
 
dyerkes said:
I went with the sport version as I was concerned as to how loud or resonating the race ones might be. While the sport version is a little louder than the stock muffler, and it does offer a mild amount of gurgling, it's a little tamer than what I was hoping for. In listening to your recordings, I would have liked it to be closer to yours.
Click to expand...

To be honest I'm not sure how accurate the sound recording is on that. I did think the same as you, that it was too quite... for a few hours driving. But it's just enough, I think, and now it's run in it get an amazing noise from the engine - almost like a supercharger :) You are right about the race system - even the guys at the factory said the race system would be too loud.

Not sure how long you've had yours on, but 1000+ miles and it's coked up nicely and sounds fantastic! Have been told it sounds great when I give it a boot full pulling away from junctions too. Trust me, I loved mine from the start, despite thinking it was a little quiet, and it just got better.

Love the look too 8)
 
No electrical connection on the UK/EU filter canister and certainly no warning lights showing

Do some research on a US ///M and see what they do with the canister.
 
PawnSacrifice,

I didn't realize that yours were the Sport version as well. Wow, mine are currently considerably quiter than yours. I've only got about 40 miles on them thus far, so I guess I'll have to wait and see if mine gain a little sound with continued use.

cj10jeeper,

Yes, I'll take your advice and see if I can see what the factory did for the US M version.

Thanks,
David
 
Nope, the only thing that is passed to it are gas vapors from the fuel tank. Does your exhaust system have resonators (usually located mid way between your catalytic converts and your muffler)?

David
 
dyerkes said:
Nope, the only thing that is passed to it are gas vapors from the fuel tank. Does your exhaust system have resonators (usually located mid way between your catalytic converts and your muffler)?
Click to expand...
:tumbleweed:

Can I let CJ answer that one.
:oops:

Not sure if that will tell you...
http://www.realoem.com/bmw/partgrp.do?model=BT32&mospid=47796&hg=18&fg=10
 
The part I was asking you about is the 3rd diagram that shows, which is labeled "Front exhaust". If your car doesn't have these, then that would certainly be an explaination as to why your exhaust is louder than mine.
 
Think they're there... in front of the reinforcement plate:
Z4_On_Lift.jpg

Sure it just needs bedding in... also, I found I started out wanting / expecting loudness, but I realised it's a bit more subtle than that, you will hear what's going on at the other end. That's what I like about CJ's quad setup, it's just that bit more than OEM. Don't get me wrong, the H&S systems some of the guys here have are immense, just not something I could have every day.

One last thing, you may need to heat shield the bumper - after Wales I think I've melted a section of the LHS bumper cutout (no-one can accuse me of not trying :D )

Post some pics when you get a sec.
 
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