Removal of the secondary butterflies

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Removal of the secondary butterflies

Post  stan2nz on Sun 02 Apr 2017, 2:22 pm

what are the pros and cons to removing the secondary butterflies

Anyone done this and what were the results overall
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Re: Removal of the secondary butterflies

Post  2wheelsagain on Sun 02 Apr 2017, 2:28 pm

@stan2nz wrote:what are the pros and cons to removing the secondary butterflies

Anyone done this and what were the results overall

Search Results Plenty of info on the link.

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Re: Removal of the secondary butterflies

Post  reddog on Sun 02 Apr 2017, 2:44 pm

Pros - Throttle response, computer can't tell you what to do. Wheelies Smile

Cons - Bit tricky to do. Less engine brake
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Re: Removal of the secondary butterflies

Post  NZspokes on Sun 02 Apr 2017, 3:07 pm

Easy peezy. Follow the guides. You will need to remap or fit a fuel controller. 

Much more power up top, as in 20hp.
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Re: Removal of the secondary butterflies

Post  NZspokes on Sun 02 Apr 2017, 3:33 pm

This gives the outline of how to do it. http://www.holeshot.com/suzuki/bandit/650-1250/products/efi-supertune-pro

I have a Supertune for sale. Very Happy
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supertune

Post  stan2nz on Sun 02 Apr 2017, 6:06 pm

tell me more and how much
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Re: Removal of the secondary butterflies

Post  NZspokes on Sun 02 Apr 2017, 6:37 pm

@stan2nz wrote:tell me more and how much
Its the same one I linked to above. Had it in for 6 months but looking at headwork and cams so going down the flash path. 

For a kiwi I will sell it for $280 and help with fitting and setting if you are in Auckland. 

I have the stage 2 and stage 2 full system settings so you will need to remove the secondry butterflys, O2 sensor, fit a K&N filter and cut the back off the airbox lid.
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Re: Removal of the secondary butterflies

Post  madmax on Mon 03 Apr 2017, 6:40 pm

@NZspokes wrote:You will need to remap or fit a fuel controller. 


Yeah - Nah!
Haven't had secondaries in for 3 years now, no issues at all

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Re: Removal of the secondary butterflies

Post  NZspokes on Mon 03 Apr 2017, 7:21 pm

@madmax wrote:
@NZspokes wrote:You will need to remap or fit a fuel controller. 


Yeah - Nah!
Haven't had secondaries in for 3 years now, no issues at all
Ive just taken my fuel controller out and its on the stock computer until the dyno tomorrow. The bike has lost significant power. Top end is dead.  Sleep
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Re: Removal of the secondary butterflies

Post  madmax on Mon 03 Apr 2017, 11:34 pm

@NZspokes wrote:
@madmax wrote:
@NZspokes wrote:You will need to remap or fit a fuel controller. 


Yeah - Nah!
Haven't had secondaries in for 3 years now, no issues at all
Ive just taken my fuel controller out and its on the stock computer until the dyno tomorrow. The bike has lost significant power. Top end is dead.  Sleep

probably because your used to the performance you had with the fuel controller. Removing the butterflies alone is not enough to need a fuel controller, certainly not in my experience anyway.

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Re: Removal of the secondary butterflies

Post  NZspokes on Tue 04 Apr 2017, 5:31 pm

This is the difference between just pulling them out and leaving it and getting it tuned. Fuel curve was backwards for it. Fuel added up top and removed down low. 

https://www.facebook.com/brmmotorcycles/posts/699015690260526
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Re: Removal of the secondary butterflies

Post  madmax on Wed 05 Apr 2017, 9:29 am

I can only speak for my own experience and that of several others who have removed the secondaries and not need to add aftermarket ECUs unless doing additional modifications.

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Re: Removal of the secondary butterflies

Post  Dekenai on Wed 05 Apr 2017, 3:01 pm

Another alternative...pin them open using the ECU, https://www.woolichracing.com/products/suzuki/gsf-1250-bandit/2008/2008-suzuki-gsf-1250-bandit-ecu-flashing.aspx#productTable , seeing as how you need a fueling solution anyway




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2007-2010 Suzuki GSF 1250 (Bandit)
   USB (Denso) v3 Package


This package includes everything you need to start tuning your 2007-2010 GSF 1250 with our USB (Denso) v3.



  • USB (Denso) v3

  • Suzuki Type 2a Harness

  • USB Cable

  • Bin File Definitions in the Woolich Racing Tuned software



   Features available for Suzuki GSF 1250 Bandit 2007-2010




  • IAP Fuel Maps

  • TPS Fuel Maps

  • Ignition Timing Maps

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  • Real Time Engine Data


US$389.00
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Re: Removal of the secondary butterflies

Post  rodent4 on Wed 10 Jan 2018, 7:50 am

Bike is going in for 24000k service tomorrow, thinking of getting the guys to remove the secondary butterflies while they're in there. 

I'm assuming that the TB needs to be removed to do the shims? Also, once the TB is out is it possible to remove the airbox?

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Re: Removal of the secondary butterflies

Post  madmax on Wed 10 Jan 2018, 4:11 pm

@rodent4 wrote:Bike is going in for 24000k service tomorrow, thinking of getting the guys to remove the secondary butterflies while they're in there. 

I'm assuming that the TB needs to be removed to do the shims? Also, once the TB is out is it possible to remove the airbox?

I'm 99.99% certain you won't need to do the shims, but that's up to you

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Re: Removal of the secondary butterflies

Post  rodent4 on Wed 10 Jan 2018, 4:40 pm

@madmax wrote:
@rodent4 wrote:Bike is going in for 24000k service tomorrow, thinking of getting the guys to remove the secondary butterflies while they're in there. 

I'm assuming that the TB needs to be removed to do the shims? Also, once the TB is out is it possible to remove the airbox?

I'm 99.99% certain you won't need to do the shims, but that's up to you


I'm 100% sure that you are 99.99% correct  Very Happy

I had cams installed at 12000k's so they should be ok, but do they still have to remove the tappet cover to check anyway?

And does the TB come out when they check?

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Re: Removal of the secondary butterflies

Post  reddog on Thu 11 Jan 2018, 12:58 am

No it doesn't.

Unless you hit the limit a lot no need for valve clearances. Just doing my 42k service now on my 10 year old 1250. No problems thus far
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Re: Removal of the secondary butterflies

Post  Bandakias on Thu 11 Jan 2018, 5:25 pm

@rodent4 wrote:Bike is going in for 24000k service tomorrow, thinking of getting the guys to remove the secondary butterflies while they're in there. 

I'm assuming that the TB needs to be removed to do the shims? Also, once the TB is out is it possible to remove the airbox?

You should remove the butterfleis, especially if you have camshafts installed (yoshimura? ) .They are holding you at least 7hp on top.
Removing or not the throttle bodies depends. The throttle cables are the problem. You can avoid removing it. And for last question yes.

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Re: Removal of the secondary butterflies

Post  rodent4 on Thu 11 Jan 2018, 6:07 pm

@Bandakias wrote:
@rodent4 wrote:Bike is going in for 24000k service tomorrow, thinking of getting the guys to remove the secondary butterflies while they're in there. 

I'm assuming that the TB needs to be removed to do the shims? Also, once the TB is out is it possible to remove the airbox?

You should remove the butterfleis, especially if you have camshafts installed (yoshimura? ) .They are holding you at least 7hp on top.
Removing or not the throttle bodies depends. The throttle cables are the problem. You can avoid removing it. And for last question yes.


Thanks for chiming in bro, just this arvo I was read a thread of yours over on UKBandit  Cool 

Yes, Yoshimura cams, Arrow headers and Akra can.

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Re: Removal of the secondary butterflies

Post  Bandakias on Thu 11 Jan 2018, 9:06 pm

For the record, have you take it for dyno? I presume stock compression.

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Re: Removal of the secondary butterflies

Post  rodent4 on Fri 12 Jan 2018, 5:56 am

Dyno last year, made 118 hp@9200 at the wheel and 113 Max torque@6300.

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Re: Removal of the secondary butterflies

Post  Bandakias on Fri 12 Jan 2018, 8:16 am

@rodent4 wrote:Dyno last year, made 118 hp@9200 at the wheel and 113 Max torque@6300.
 Not much, i was expecting more. I believe without butterflies and open airbox you should be around 130. Your dyno chart must have a big hole at 7000 to 9000 rpm.

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Re: Removal of the secondary butterflies

Post  rodent4 on Fri 12 Jan 2018, 8:43 am

@Bandakias wrote:
@rodent4 wrote:Dyno last year, made 118 hp@9200 at the wheel and 113 Max torque@6300.
 Not much, i was expecting more. I believe without butterflies and open airbox you should be around 130. Your dyno chart must have a big hole at 7000 to 9000 rpm.

You're right on the money  Cool  So you think Butterflies and airbox work will straighten out the line a bit?



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Re: Removal of the secondary butterflies

Post  Bandakias on Fri 12 Jan 2018, 5:02 pm

Yes, imagine you should have peak power about 8000 to 8500 so in that area your dyno will be more than the 9000 spot. I believe you have adjust the fuel.
You will feel a big difference after 6500 rpm

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Re: Removal of the secondary butterflies

Post  rodent4 on Sat 20 Jan 2018, 5:48 pm

Picked the bike up this morning. Didn't really get a chance to get much of a ride in but it is pulling substantially harder  Cool 

They cut the top out of the air box lid while it was there, not sure yet whether I like the roar or not  Question   If not I have a spare I can fit.

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Re: Removal of the secondary butterflies

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