Dr.D exhaust questions??


17 replies to this topic
  • toofast2

Posted May 11, 2007 - 04:34 AM

#1

Just installed Dr. D exhaust on a "06" YZF 450(Old style),and I noticed that
the midpipe is very close to the rear shock sub-ass.(bladder),it's not touching
but it's within a 1/4".My question is;are there any heat transfer issue's,effecting the rear shock/bladder with the exhaust pipe so close??:applause: THX P.S.Greyracer,do you have this pipe?,and if so,
do you think,there would be heat transfer issue's??:applause:

  • grayracer513

Posted May 11, 2007 - 10:20 AM

#2

Don't think so. It's almost exactly where the stock pipe is.

  • toofast2

Posted May 11, 2007 - 11:17 AM

#3

Don't think so. It's almost exactly where the stock pipe is.

Thanks Grey,I didn't really look at stock pipes clearance's before I removed
it,also did you change needle?...Dr.D recommends PT# 5TA-14916-PL-00,
stock is a PR-00(#NFPR)? THX ED

  • grayracer513

Posted May 11, 2007 - 11:51 AM

#4

I haven't changed the needle from the stock NFPR (#4). Originally, Dubach was recommending the NFLR in #4, but then the web site changed and the rec went to an NFLR only at high altitude. The number given, 5TA-14916-PL-00, doesn't show as a valid PN when I search for it, and by the way that Yamaha has them listed, that needle would be like raising the stock one 5 steps. A call to Dr.D for clarification would appear to be in order.

We run ours at 45/165/NFPR(#4), basically everywhere, up to about 3600 ft.

  • DPW

Posted May 12, 2007 - 06:54 AM

#5

the response that Dr.D racing sent me >>>

"That is correct it does run close. You should not have any issues. If you
do let us know but that is the way they are bent. It has to be bent away
from other things etc. Jetting is for 0-3000' so if you are in that area you
are ok. "

  • DPW

Posted May 12, 2007 - 07:00 AM

#6

but then the web site changed and the rec went to an NFLR only at high altitude.


Where does it state that on the Dr.D website?

  • grayracer513

Posted May 12, 2007 - 08:24 AM

#7

Where does it state that on the Dr.D website?


Go to the site and click the Technical link. Jetting recommendations comes up first thing. Fill out the form for an '06 YZ450, and you'll see two links under the listed recommendation: "Low end issues", and "8000ft +". It's listed there.

One day, if it bugs me enough, I'll call him and ask about the PL needle thing.

  • DPW

Posted May 12, 2007 - 08:29 AM

#8

thanks...I see it now.

  • hi everybody

Posted May 12, 2007 - 05:32 PM

#9

Does anyone know if you can purchase the 2007 DR D ti as a slip on? I cant seem to find it anywhere...and I kinda like the stock header.

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  • hi everybody

Posted May 13, 2007 - 07:15 PM

#10

anybody ?

  • grayracer513

Posted May 13, 2007 - 07:21 PM

#11

This would be the place to look:

http://www.dubachracing.com/

  • black_n_blue_thumper

Posted May 13, 2007 - 07:47 PM

#12

Just installed Dr. D exhaust on a "06" YZF 450(Old style),and I noticed that
the midpipe is very close to the rear shock sub-ass.(bladder),it's not touching
but it's within a 1/4".My question is;are there any heat transfer issue's,effecting the rear shock/bladder with the exhaust pipe so close??:applause: THX P.S.Greyracer,do you have this pipe?,and if so,
do you think,there would be heat transfer issue's??:applause:


Whats an 'old style'. Did they make two different models in 06?

  • hi everybody

Posted May 13, 2007 - 07:51 PM

#13

Yeah I checked the site...but It looks like there not selling just the silencer anymore...bummer:(

  • grayracer513

Posted May 13, 2007 - 08:21 PM

#14

IMO, 90% of slip-ons are 90% bling, and 10% performance improvement. There are always exceptions, but not many. To make much real improvment, a complete, engineered, end-to-end system is needed.

  • hi everybody

Posted May 13, 2007 - 08:46 PM

#15

really? how do you feel about the 2007 stock header? compared to the Dr. D?

  • grayracer513

Posted May 13, 2007 - 10:06 PM

#16

The '07 header is a nice piece of work, and seems to work even better with an '06 silencer.

But the Dubach exhaust was actually among the first to really work with the stepped pipe technology that the '07 YZF uses, and as I said, it usually works better to use a system that is designed to achieve a particular result as a total package, although it should be possible to build one around the stock header. It's just that for the most part, no one does.

  • hi everybody

Posted May 13, 2007 - 10:20 PM

#17

yeah I getcha...My buddy just got a stainless full system for his 06 450..and he said it didnt make that huge of a difference..and just made it feel more "freed up" which is what im looking for with my 07...it just seems that the stock silencer plugs it up so much. thanks for the replies tho! looks like a lil more cash and a full system are in order...

  • grayracer513

Posted May 14, 2007 - 06:18 AM

#18

On some bikes, like the '05 RMZ450, the stock exhaust is not well executed, and aftermarket pipes can and do add as much as 5 hp or more. This is not the case with YZF's, however. The most you will usually see on dyno comparisons with stock is something approaching 2 hp, and that would be a pipe with a very narrow focus on one part of the power curve. You just won't see a "huge" difference with an exhaust system in most cases, but with a good one, you will be able to notice it.





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