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DB 7-8-9 exhausts MOTOCORSE v ARROWS v OEM Bimota

 
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Gavin944888



Joined: 29 Jan 2014
Posts: 383
Location: Essex....way South of Scotland

PostPosted: Thu Nov 15, 2018 5:40 pm    Post subject: DB 7-8-9 exhausts MOTOCORSE v ARROWS v OEM Bimota Reply with quote

Hello,

I have a set of Motocorse headers for a DB8 fitted to my DB9.

These headers directly replaced the Arrows 2 into 1 Factory race system which moved over onto the DB7-11 VLX prototype replica.

At the time MotoCorse only supplied the headers which dictated someone else making the end cans.

I have had a history of working on exhaust systems (2 stroke and 4 stroke) and decided to sketch out some sizes and diameters.

Racefit were chosen to follow my sketches as my normal guy in Essex has retired to Australia and the 'new' company owners do not work in titanium.

The bike was finished a couple of weeks ago and spent Mon and Tuesday going through 15 different dyno runs.....at X BIKES in Wisbech.


BOB the Drill ....a DB7 owner on one the platforms (North Sea) emailed some pictures he got from MotoCorse...he is thinking of buying a set.


[img]db7e6 (003) by Gavin Robertson, on Flickr[/img]




[img]db7e2 (003) by Gavin Robertson, on Flickr[/img]



[img]db7e5 (003) by Gavin Robertson, on Flickr[/img]



Pretty nice work...but pretty expensive...but still very nice.



When I saw the photographs I was amazed.......the similarities were immense.....even down to the endcan mesh....something RACEFIT were not keen to put these on their endcans.....but they relented.




[img]IMAG0142 by Gavin Robertson, on Flickr[/img]



[img]IMAG0141 by Gavin Robertson, on Flickr[/img]



I had struggled to get the RACEFIT made longer as everyone wants short end cans...but short is LOUD and the killer of torque.



You can see from this shot that my design is slightly longer

[img]IMAG0150 by Gavin Robertson, on Flickr[/img]


So there you have it.....from a physical looks points of view.


Next up the POWER charts....max revs set at 10000rpm


OEM BIMOTA 2 into 1 system 130BHP 76 Ibs torque

ARROWS RACE 2-1 system 139BHP 82 Ibs torque

MotoCorse/RACEFIT mix 139BHP 82 Ibs torque



HOWEVER I mainly ride 6k to 8k and rarely above 9000 rpm as I am pretty sympathetic mechanically-wise and scare very easily,
plus coming from an engineering background actually watching these things run at 10k is frightening.



So...I had the DYNO remapped to this area of MY use.. mainly....ie 7000-8000rpm


Here are the real world figures.

OEM BIMOTA 2 into 1 Arrows 104 BHP and 76 Ibs @ 7750 RPM

ARROWS 2-1 Bimota factory race 116 BHP and 79 Ibs @ 7750 RPM

MotoCorse/RACEFIT 2-2 mix 122 BHP and 82 Ibs @ 7750 RPM


The MotoCorse RACEFIT is a lot quieter than the Arrows unit although it really has not beeded in yet.


Full photos to follow, but at the moment I am back onto the DB7-11VLX with a mission


Hope this info helps make peoples minds up.....maybe..starts some arguments and helps kill the 200BHP reading some suppliers claim.

EVERY DYNO IS DIFFERENT....always start with a base reading and compare accordingly.

My Elefant999r recorded 142 BHP on one dyno unit and 119 BHP on this one.


In this case ....the DB9 has moved from 104 BHP to 116 BHP up to 122BHP @7750 RPM...using each of the systems

BEST news comes from the jump from 71Ibs torque to 79Ibs then another rise up to 83 Ibs @7750 RPM on each ststem change.



regards
Gavin


Thanks to Bob the Drill for the MotoCorse images..
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On an Island in the River Thames (sounds wonderfull...doesn't it)

Cagiva Elefant 944/ST2 engined
Cagiva Elefant 888/955 engined
Cagiva Elefant 999r engined

BIMOTA DB9 (with DB11 rear end)
BIMOTA DB7-11 VLX MULE ( build coming to an end)
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vort28



Joined: 22 Mar 2010
Posts: 2050
Location: Northwest , UK

PostPosted: Thu Nov 15, 2018 6:59 pm    Post subject: Reply with quote

Motocorse are nice, but BLOODY expensive !!! Unfortunately !!!!!

Can only spend so much on toys !!

OK. I lie, but a few more K buy's a complete bike !!
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Number2



Joined: 25 Jun 2017
Posts: 40
Location: South Carolina

PostPosted: Sat Dec 15, 2018 6:09 pm    Post subject: Reply with quote

I had a local guy weld a set of pipes to get rid of the Cat on my DB7 and added a Scorpion slip on. It looks close to a factory set up and much lighter plus a little louder. If I could figure out how to post a picture I would
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vort28



Joined: 22 Mar 2010
Posts: 2050
Location: Northwest , UK

PostPosted: Mon Dec 17, 2018 11:05 am    Post subject: Reply with quote

Number2 wrote:
I had a local guy weld a set of pipes to get rid of the Cat on my DB7 and added a Scorpion slip on. It looks close to a factory set up and much lighter plus a little louder. If I could figure out how to post a picture I would


Pictures , you need an online photo share/storage account , photobucket , imgur , many others out there, upload picture and then copy an paste the link into form thread.
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Bob Taylor



Joined: 16 May 2017
Posts: 45
Location: Scotland

PostPosted: Fri Dec 28, 2018 10:17 am    Post subject: Reply with quote

Hi Gavin. Just bought set of the motocross pipes for the db7. If they look good I'll probably buy the end cans as well. Will put some photos up when I get them. I also have a galessetti set of pipes and cans if anyone is interested. Bob.
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Gavin944888



Joined: 29 Jan 2014
Posts: 383
Location: Essex....way South of Scotland

PostPosted: Fri Dec 28, 2018 10:50 am    Post subject: Reply with quote

Bob.....you devil!

Here is my finished product....the mix of Racefit end-cans and MotoExpensive headers





[img]IMAG0201 by Gavin Robertson, on Flickr[/img]






Well..........when I mean finished...it still has the Carbon belly pan from the DB7 to be fitted, then it is complete

regards

Gavin
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On an Island in the River Thames (sounds wonderfull...doesn't it)

Cagiva Elefant 944/ST2 engined
Cagiva Elefant 888/955 engined
Cagiva Elefant 999r engined

BIMOTA DB9 (with DB11 rear end)
BIMOTA DB7-11 VLX MULE ( build coming to an end)
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Bob Taylor



Joined: 16 May 2017
Posts: 45
Location: Scotland

PostPosted: Fri Dec 28, 2018 8:34 pm    Post subject: Reply with quote

Looks good Gavin. Nice colour the Ti has gone - been getting a roasting lol.
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851tricolour



Joined: 29 Nov 2018
Posts: 1
Location: Australia

PostPosted: Tue Jan 01, 2019 11:25 am    Post subject: Reply with quote

Hi Gavin,

Nice exhaust.

Great weather here for riding over the Xmas holiday.

Happy New Year to all.

Eddie.
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Raidermoto



Joined: 13 Apr 2016
Posts: 23
Location: Australia

PostPosted: Sun Jun 02, 2019 4:04 am    Post subject: Reply with quote

Nice work Gavin, thanks for sharing. You're absolutely right with the difficulty of getting guys to work with Ti, same down here in Oz, & while i do most of my own tig work, I haven't had the opportunity to experiment with Ti.

Do you have the pipe specs on hand, ID & lengths? I'm about to tackle a new system on my DB9 then the 8.

Cheers Moz
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