Quad Exhaust set up - options discussion

Yes - Herminator the centre tab fits directly to the bottom of the battery box in the same place and the existing bumper. I have actually already cut off 2 more points on the RHS where the new exhaust box will be. What you can't see here is a set of 9 bolts that run along the top lip that is a very rigid channel. That does most of the retaining work. The diffuser is amazingly rigid for its weight so a few strategic mount points wiil be enough

You should get 10% no probs. There's the over 4 year old car programme and certainly Sytner offer a 10% off discount card, called 'service advance'
 
Yeah, I get a discount on servicing, but the parts department guy said only trade gets a discount there (I know he's just fobbing me off)
My local BMW place is Fawdington, the next two nearest are both Stratstone I think, not sure if there's a Sytner.

Looks like a nice accurate cut you've made on the extra exhaust exit :thumbsup:
 
Herminator said:
Yeah, I get a discount on servicing, but the parts department guy said only trade gets a discount there (I know he's just fobbing me off)
My local BMW place is Fawdington, the next two nearest are both Stratstone I think, not sure if there's a Sytner.

Looks like a nice accurate cut you've made on the extra exhaust exit :thumbsup:
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Coming along - tonight managed to cast the dome over the cut out in fibreglass and it looks good so far. Finish it tomorrow and give it a quick coat of black paint. It's almost entirely out of sight, but I hate the thought of smart asses looking at a low angle and seeing something not quite right and worst me knowing it.
 
Like the look of that diffuser! Think a trip to the dealers is on the cards Friday! :wink:

Does it come with a cut-out pattern?
 
Breaker - yes it does come with a pattern, but it's designed for the post facelift so you just run it along the lower curved creaseline. It's a flimsy bit of adhesive paer though so when I come to it I'll work out my own

GP20 - I see no reason why not. You have to cut away similar areas of the bumper and of course in iffect replace the centre mesh section with the inward curve of the diffuser. I have a M bumper so will take a better look and let you know
 
Breaker said:
mmm-five said:
So, how much cleaner/dirtier will the diffuser make the air behind the car - in aerodynamic terms, rather than cleanliness terms of course :P

BTW, how much for the CF diffuser, as I may be wanting one (well that's not true as I do wan't one, just need to earn some money first).
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Actually, joking aside, this is what I mean about how BMW styled the M. A diffuser like that should have been standard on the M in my opinion. I can understand the other M cars not having one because they are souped up "normal" cars", but why not fit one to a sports car M? :?
 
cj10jeeper said:
Breaker - yes it does come with a pattern, but it's designed for the post facelift so you just run it along the lower curved creaseline. It's a flimsy bit of adhesive paer though so when I come to it I'll work out my own
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Thanks for that. Think I've decided to fit one now. :thumbsup: Do they suggest taking the bumper off to cut it out? (last question, honest! :P).

Looking forward to seeing your conversion! :thumbsup:
 
They do suggest removal in the instructions and TBH I can't see how you could do it without and it's less than a 5 minute job to pull if all to bits and you'd be able to work on the bench, not part under the car.

If all you are doing is fitting this to your coupe then I think it's an easy job just requiring a bit of bumper cutting. It's the rebuilding and making work for quad that takes the effort.

My conversion may not be done for a fair while as it's one of thos e ongoing projects that's in several phases and collecting the bits and 'intelligence' on optimum ways to do things takes a lot of time.
 
Thanks. Yes, just going to fit it as is to my coupe. Can't see it being a problem to cut out (I am a certified vehicle body builder although I haven't done that job for a while!) as it's an '7 car. I would have probably taken the bumper off anyway. I guess it may be an idea to use the old scalpel trick when marking the cut-out on the bumper so as not to chip the paint.

Your project reminds me of my second MINI Cooper. I fitted the Cooper S chrome fuel filler to it even though the dealers mechanics said it couldn't be done! :P
 
Breaker said:
Thanks. Yes, just going to fit it as is to my coupe. Can't see it being a problem to cut out (I am a certified vehicle body builder although I haven't done that job for a while!) as it's an '7 car. I would have probably taken the bumper off anyway. I guess it may be an idea to use the old scalpel trick when marking the cut-out on the bumper so as not to chip the paint.

Your project reminds me of my second MINI Cooper. I fitted the Cooper S chrome fuel filler to it even though the dealers mechanics said it couldn't be done! :P
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I like the scalpel idea :thumbsup: I'll see once removed but probabbly use a combination of jigsaw and reciprocating saw with a fine laminate blade and a layer of masking tape on the good paint to avoid any vibration scratches.

So often dealers cannot do things because it's not on the factory approved list, nor does it have a procedure or time. Of course if they screw up then big problems to rectify.

When you get it remember to ask for the fitting instructions from the ASAP (After Sales Assistance Portal). Has a few diagrams and comments in it.
 
GP20 said:
The CF diffusor looks pretty sweet. Makes me wonder if I could fit that onto my M bumper.
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OK - GP20 I had a look this evening and think that while the profile is largely the same and you could chop away the twin exhaust outlets and the centre mesh section, you would have one area to worry about. At the extreme ends of the diffuser it's shaped to fit the non M style bumper that has a lip, which is not on the M. You would therefore have to either build up the bumper or infill the diffuser. Not impossible but an extra consideration and in a spot that is visible from the side.

Decided to cast myself a second outlet in fibreglass and resin. Worked pretty well :) :

Couple of shots before spraying. There was no need to be overly critical as it's completely upside down and invisible unless crouched down, or certain low angle side views. It's now all sprayed up black, but is a bit dark in artificial light to photograph.

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Are you planning on smoothing over the edges of the carbon at the cutout?

Back when I raced RC cars, the chassis came with razor sharp edges, we sanded them smooth and then sealed the edge with super glue, gives a nice shiney finish and stops any splinters.
 
Smoothed, sanded and sorted and in fact I had some high temp black paint so finished it in that :thumbsup:

Yep - Both Glass fibre and CF are sharp
 
Thanks for finding out for me. :thumbsup: You have some nice skills with fiberglass too.

Doesn't sound like a very easy job for the M bumper I guess. I was actually looking at the ACS rear diffusor, which also requires cutting away the center bottom trim on the stock M bumper, but fitting would still be a lot easier. The only reason I decided to not get it is I don't like how their carbon fiber patterns look, and they don't match my carbon fiber front grills. The 2x2 twill patterns on your OEM diffusor look a lot better.
 
cj10jeeper said:
OK so more questions ...lol

Diffuser is about £280, but I got 25% off so not too bad.
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Ordered my diffuser this afternoon. On the dealers computer it costs £340 inc VAT!!!! :o I managed to get him down to £280 then down a bit more so I ordered it. But, £340 is the listed price on the BMW spares computer!!

Should be here next Wednesday so I may have a project next weekend. :thumbsup: Got to figure out how to get the rear bumper cover off now!! Looking at it this afternoon I think it could be cut on the car! Have to have a good check tomorrow.
 
Was a bit busy fitting an alternator to the X5 so no real progress on the Zed today.

Just had a change of heart and sprayed both of the CF 'portals' gloss black. They now look identical and very OEM :)

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Made a bit more progress and got on with chopping up the battery box and rewiring it. Way more complex than I would have wished, but - well it's a project.

Basically took 20cm out of each side of the box (not actually the middle due to profiles) Cut it in such a way as I kept all the key points such as cable connector on the LHS, starter cable access hole and undertray mounting points on the base and then heat welded it back together. Not a thing of beauty, but its a battery box. Hardest part was to ensure that I could reroute the starter cable and it arrive at the the '+' terminal to right way around and retaining all the fire/emergency shut off features.

Re-routed the OEM starte cable and converted the battery terminal to 6mm female. Added a new earth lead. Needs tidying up once the floor is finished.

Goes in Tuesday to have the floor replated and then I need to construct a proper battery restraint frame.

Out - huge hole left
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Rebuilt, but half the size
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Back together (temporary only)
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