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HaroldC
10-27-2003, 11:56 AM
Trying a prototype exhaust that I made with cardboard and duct tape. It weighs in at under 2 lbs right now, but may have to increase when I use more tape to seal the muffler ...... it was bulging due to such low backpressure. Only the left tips are active, since it is the most direct path out of the car, why anyone would only use the right tips are beyond me. New software is necessary because of the negative backpressure, exhaust gasses now actually go back into the cylinders.

Dynoed yesterday on the emissions dyno at the local gas station at +32hp, give or take 33hp for margin of error. Man it sounds great! Now I just have to find a way to prevent the thing from catching on fire ....... =p

<img src="http://members.roadfly.org/haroldc/e46m3_tips.jpg">



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alevy
10-27-2003, 12:07 PM
<img src="http://www.classesusa.com/car/stuff/newdinan.jpg">

-Alex<br><hr>
-Alex Levy
<img src="http://www.classesusa.com/car/stuff/signature.jpg">
03 Alpine White M3
Cinnamon Leather / Aluminum Trim
SMG / Nav / Xenons

txse46m3
10-27-2003, 12:13 PM
is going to get an anti Dinan reputation.

That's not really fair considering their oustanding success with the S2M5 and Z8.<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

jimmy325
10-27-2003, 12:15 PM

lincoln30
10-27-2003, 12:17 PM
Passenger side according to what Steve Dinan showed us on Saturday. So the mid pipe connects to the muffler on the drivers side and turns to exit the passenger side. He did a nice job explaining why he thinks this is a better solution.

lincoln30
10-27-2003, 12:19 PM
not Dinan's shop

alevy
10-27-2003, 12:24 PM
they wouldnt have to rely on the striking ingenuity of their "Authorized Dealers".<br><hr>
-Alex Levy
<img src="http://www.classesusa.com/car/stuff/signature.jpg">
03 Alpine White M3
Cinnamon Leather / Aluminum Trim
SMG / Nav / Xenons

jimmy325
10-27-2003, 12:45 PM

jason2
10-27-2003, 12:50 PM

lincoln30
10-27-2003, 01:04 PM
He showed a cutout of the OEM exhaust and explained how it flowed equally from all 4 tips even though it has to turn 180 degrees to exit the drivers side tips and 360 to exit the passenger side tips. He also mentioned how much it flowed, but I don't remember this number. He then explained all the different things they tried to do to retain 4 flowing tips and still get a significant increase in flow, but in the end Steve himself decided to go with the one side flow with just a 90 degree turn. Again, he gave the flow numbers and they were significantly better then stock. He also did alot of explaining about intakes, MAFs, exhaust and how they work together and need to be enlarged to flow, but still remain in proportion to each other. He talked about how VANOS works in detail and it was very interesting, but I could never do it justice here. Whether or not you like Dinan stuff, if you ever have the opportunity to see his presentation you should jump at the chance...it's educational and entertaining.

lincoln30
10-27-2003, 01:06 PM
on Saturday's Dallas visit, but I didn't stay for the Q&A. Maybe someone else on the board did and can tell us what his explaination for the design was/is???

HaroldC
10-27-2003, 01:13 PM
at their Mt. View shop. Z8s were shipped to Dinan in CA have the S2 pakage done.


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alevy
10-27-2003, 01:16 PM
<br><hr>
-Alex Levy
<img src="http://www.classesusa.com/car/stuff/signature.jpg">
03 Alpine White M3
Cinnamon Leather / Aluminum Trim
SMG / Nav / Xenons

cbailey781
10-27-2003, 01:23 PM
that there is a max diameter size that you shouldn't exceed when building exhaust outlet, because you could cause the flow of exhaust fumes to slow down. Also, the material you are using, perhaps can not handle some of the extreme temps of the fumes :-)... Bottomline, a good engineeer can appreciate sound judgements and decisions.<br>


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cbailey781
10-27-2003, 01:25 PM
power, due to the slowing of the exhaust gases coming from the engine; you may want to consider using the right outlets instead of the left ones, like Dinan did :-)<br>


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cbailey781
10-27-2003, 01:27 PM
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cbailey781
10-27-2003, 01:34 PM
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HaroldC
10-27-2003, 01:42 PM
<a href="http://www.m5board.com/vbulletin/showthread.php?s=&threadid=33867&highlight=dinan+s2+z8">S2 Z8 thread from M5Board.com</a>


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HaroldC
10-27-2003, 01:44 PM
<br>
<img src="http://members.roadfly.com/haroldc/sigpic.jpg">

ssutisna
10-27-2003, 01:49 PM

HaroldC
10-27-2003, 02:37 PM
it doesn't get much shorter than this. And we all know it's got plenty of power.

<img src="http://motorsports.nifty.com/f1/pics/team/ferrari_engine_l.jpg">



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4thm3
10-27-2003, 02:44 PM
that Dinan thought that their headers built for the M5's V8 should fit exactly the same as the Z8 since its the same motor. Problem they ran into was that clearance of the headers on the Z8 was tighter, so they popped some welds between the body and frame. In a related issue, they also found the footwells to be double-walled and intruded further into the engine bay, so they cleverly bashed in the wall facing the engine (not visible from the cabin).

Now Dinan has found 3 shells to replace them since BMW won't honor the body's integrity wrt to warranty issues in a crash. BMW hasn't been as cooperative since Dinan found the shells in Europe w/in the supply chain (ironic eh?). However, there were still 4-5 more to be fixed.

Dinan is now redesigning the headers for the Z8 so they will fit properly.

As for explaining the lack of reproducible power gains claimed by Dinan...<br><!--EMBED SRC="http://members.roadfly.com/4thm3/acc3.mp3" hidden="true" autostart="true"-->

m3guy35
10-27-2003, 03:13 PM
Ha ha! :)

Funny pic.

cbailey781
10-27-2003, 03:17 PM
in the pipes from travelling from the rear mounted engine, differ than front mounted engines...that's why the M-coupe w/ the M3 engine couldn't get as much HP; exhaust pipes wasn't long enough...<br>


<img src="http://members.roadfly.com/cbailey781/signature.JPG">

txse46m3
10-27-2003, 04:23 PM
out of your mouth one of these days. The Mcoupe was detuned by BMW intentionally. 7200 RPM limit. Check your power output at 7200 RPM...you'll notice its right at mcoupe levels.

d'oh!<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

txse46m3
10-27-2003, 04:25 PM
clogged? you a plumber? wtf?

Maybe you should give Tom Milner a call and let him know that' he fuxed up the PTG M3's.

AAAAAAAAAAAAAAaaaaaaaaaaaarrrrrrrrrrrrrrrrrrrrrggg ggggggggggggg<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

cbailey781
10-27-2003, 04:26 PM
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<img src="http://members.roadfly.com/cbailey781/signature.JPG">

txse46m3
10-27-2003, 04:27 PM
the exhaust valve.

So how many white papers have you written on this subject? How many have you read? How many of those you have read don't say Dinan at the top of them?<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

cbailey781
10-27-2003, 04:27 PM
<br>


<img src="http://members.roadfly.com/cbailey781/signature.JPG">

txse46m3
10-27-2003, 04:28 PM
valve. Pressure is.<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

cbailey781
10-27-2003, 04:28 PM
so talk to the hand...<br>


<img src="http://members.roadfly.com/cbailey781/signature.JPG">

txse46m3
10-27-2003, 04:29 PM
this morning. You need a gizmo. ROFL<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

cbailey781
10-27-2003, 04:29 PM
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cbailey781
10-27-2003, 04:30 PM
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JETcpe
10-27-2003, 04:30 PM
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<img src="http://members.roadfly.org/jetcpe/sig1.jpg"

cbailey781
10-27-2003, 04:34 PM
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<img src="http://members.roadfly.com/cbailey781/signature.JPG">

txse46m3
10-27-2003, 04:38 PM
<br><img src=http://members.roadfly.org/txse46m3/haha.gif height=98 width=152>

JETcpe
10-27-2003, 04:41 PM
<br>

<img src="http://members.roadfly.org/jetcpe/sig1.jpg"

Rowley
10-27-2003, 04:41 PM

cbailey781
10-27-2003, 04:44 PM
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<img src="http://members.roadfly.com/cbailey781/signature.JPG">

cbailey781
10-27-2003, 04:45 PM
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<img src="http://members.roadfly.com/cbailey781/signature.JPG">

cbailey781
10-27-2003, 04:47 PM
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<img src="http://members.roadfly.com/cbailey781/signature.JPG">


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