BC AIRBOX REMOVAL-really!
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I bought a kit from them for my bike....I was disappointed to find that there were no instruction's included with the kit. If you go to newbonneville.com there are instruction's there that will guide you.
Do you already have the kit?
Aside from no included instruction's I was pleased with the kit overall, pretty decent fit and finish to the parts.
Do you already have the kit?
Aside from no included instruction's I was pleased with the kit overall, pretty decent fit and finish to the parts.
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3,624 Posts
I'll get the instructions from nb. Thanks! I do not have the kit yet, but I took the old air box out today with a sawzall. Sean at BC told me that there is a significant increase in power, up to 15hp with the TOR pipes. He said he was surprised at how well the TOR pipes did on the dyno. They also have the intake manifolds for $100.00 with the kit, so I got those to help response. Trying to get in the 70 hp range or so. BC also told me that you can get mid 70 hp without a big bore kit. One step at a time. Next thing is to get new sticky tires. Thanks again!!!
My 2Cents for what it's worth:
Sure hope the BC Airbox Removal Kit is a whole lot cheaper than the NB NARK--otherwise, why would you buy one without instructions and use the other vendor's instructions? The NARK may not be the best kit available; however, it is a good kit with good instructions AND good vendor support.
Don't believe everything BC's "used car salesman, Sean" tells you. You should get a noticeable hp increase; however, the numbers can vary from bike to bike AND the TORS may still be too restrictive to get the most hp increase out of your bike. My guess would be that if you size the jets & needles correctly on a dyno with EGA, you should be looking in the neighborhood of 64 RWHp on a conservative dyno. Remember, all dynos do not read the same.
Your airbox removal method: :-D :-D :-D Hope you have a good vacuum. I took mine out the old fashioned way--in one piece, and loaned it to someone who planned to modify the airbox for the K&N cone filters...should be a little easier to do on the workbench--not to mention a whole lot less messy for the bike. :-D
Larry
Sure hope the BC Airbox Removal Kit is a whole lot cheaper than the NB NARK--otherwise, why would you buy one without instructions and use the other vendor's instructions? The NARK may not be the best kit available; however, it is a good kit with good instructions AND good vendor support.
Don't believe everything BC's "used car salesman, Sean" tells you. You should get a noticeable hp increase; however, the numbers can vary from bike to bike AND the TORS may still be too restrictive to get the most hp increase out of your bike. My guess would be that if you size the jets & needles correctly on a dyno with EGA, you should be looking in the neighborhood of 64 RWHp on a conservative dyno. Remember, all dynos do not read the same.
Your airbox removal method: :-D :-D :-D Hope you have a good vacuum. I took mine out the old fashioned way--in one piece, and loaned it to someone who planned to modify the airbox for the K&N cone filters...should be a little easier to do on the workbench--not to mention a whole lot less messy for the bike. :-D
Larry
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1,999 Posts
I have the billet intakes as well, in hindsight I don't know that I would do it again...I'm sure the difference on paper...( dyno )...is minimal at best.
Larry offer's good advice....don't believe everything your told. Also if you really want to get the most out of the bike...get it on a dyno. Preferably a local one that you can return to on a regular basis so you can compare benefit's of mod's that you do in the future.
I'd love to see pic's of the sawzall removal method.... :hammer:
Larry offer's good advice....don't believe everything your told. Also if you really want to get the most out of the bike...get it on a dyno. Preferably a local one that you can return to on a regular basis so you can compare benefit's of mod's that you do in the future.
I'd love to see pic's of the sawzall removal method.... :hammer:
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3,624 Posts
It was a slaughter house! I'm sure the kit should be easy enough to put in, and BC seemed easy enough to contact and get advise from. While I was preping the bike for installation( removing carbs, manifolds ect. ) I finally got to put in the carb socket screw kit from New Bonneville. I have worked on a lot of bikes before but I must say Triumph uses the cheapest stuff available for fasteners. I also put NB's engine case bolts and control bolts on the bike, just so I could be able to remove them if I need too. Come on Triumph, gives us some good quality stuff!!l Hey Red-I have all stinking winter to clean it! Thanks for the real world numbers!!!
[ This message was edited by: Brooksie on 2006-11-02 16:27 ]
[ This message was edited by: Brooksie on 2006-11-02 16:27 ]
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40 Posts
I did the BC airbox replacement, had to get my instructions from NewBonneville.com too. I also have the TORs. I'm happy with the increase in power, but my best dyno run was 59hp. That's with the 145 main jets, too. But whatever the number, the best thing is the powerband is nice and linear, no big dip in the middle anymore. It feels more 'alive' now in the midrange.
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3,624 Posts
Thanks for the info! I'm surprised that the bike didn't break 60 hp. But then again, I guess the Bonnie just isn't made for speed unless you punch it out. I was thinking about doing the whole nine yards with big bore and cams, but will just go with this air box upgrade for some increased enjoyment. I guess my 955i won't have to worry about a Bonneville passing it very soon!
I had an '05 790 with the restrictor plate removed from the air box, K&N, bellmouth, Thruxton needles, and self modified D&D's. On the same Dyno I frequent for bikes of past, it Dyno'ed at 61+ SAE.
Then I sold the bike.
However before I sold the BonnieBlack, I returned it to it's stock configuration save for the ristrictor plate. I returned the stock needles, stock air filter, and stock pipes onto the bike.
My story:
I noticed little difference in the pleasure of riding my Bonnie when it was tamer and quieter with the stock/"restrictive" parts back in place. It was smoooother, the power more linear, and I can't help but think that those rubber mounts on the stock mufflers ELIMINATE a large bulk of (muffler) vibration.
What configuration will I settle on for my Red project bike?
I'm not removing the restrictor plate, nor do I have ANY desire to eliminate the air box. Gotta have the K&N & bellmouth ('cause I paid the big bucks for 'em.....), going with Thruxton needles, and plan to run my modified D&D's. And someday I may actually weld the factory muffler mounting system to the cans I end up with at the end of another year of riding.
My point?
Modify, rip up, tear into, Sawsall, tweek your Bonnie all you want; but do it because you enjoy doing that sorta thing. The gains in performance will be ever-so-slight, and your Bonnie twin will remain a Bonnie twin. You can not make a tame retro cruiser into a screaming big-twin monster simply by spending big bucks on cams, an air box elimination kit, and loud pipes. But if you like doing that sorta thing, there sure are a lot of parts-is-parts to choose from!
Then I sold the bike.
However before I sold the BonnieBlack, I returned it to it's stock configuration save for the ristrictor plate. I returned the stock needles, stock air filter, and stock pipes onto the bike.
My story:
I noticed little difference in the pleasure of riding my Bonnie when it was tamer and quieter with the stock/"restrictive" parts back in place. It was smoooother, the power more linear, and I can't help but think that those rubber mounts on the stock mufflers ELIMINATE a large bulk of (muffler) vibration.
What configuration will I settle on for my Red project bike?
I'm not removing the restrictor plate, nor do I have ANY desire to eliminate the air box. Gotta have the K&N & bellmouth ('cause I paid the big bucks for 'em.....), going with Thruxton needles, and plan to run my modified D&D's. And someday I may actually weld the factory muffler mounting system to the cans I end up with at the end of another year of riding.
My point?
Modify, rip up, tear into, Sawsall, tweek your Bonnie all you want; but do it because you enjoy doing that sorta thing. The gains in performance will be ever-so-slight, and your Bonnie twin will remain a Bonnie twin. You can not make a tame retro cruiser into a screaming big-twin monster simply by spending big bucks on cams, an air box elimination kit, and loud pipes. But if you like doing that sorta thing, there sure are a lot of parts-is-parts to choose from!
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1,999 Posts
My point?
Modify, rip up, tear into, Sawsall, tweek your Bonnie all you want; but do it because you enjoy doing that sorta thing. The gains in performance will be ever-so-slight, and your Bonnie twin will remain a Bonnie twin. You can not make a tame retro cruiser into a screaming big-twin monster simply by spending big bucks on cams, an air box elimination kit, and loud pipes. But if you like doing that sorta thing, there sure are a lot of parts-is-parts to choose from!
I beg to differ sir...( insert evil grin here )...
:razz:
Modify, rip up, tear into, Sawsall, tweek your Bonnie all you want; but do it because you enjoy doing that sorta thing. The gains in performance will be ever-so-slight, and your Bonnie twin will remain a Bonnie twin. You can not make a tame retro cruiser into a screaming big-twin monster simply by spending big bucks on cams, an air box elimination kit, and loud pipes. But if you like doing that sorta thing, there sure are a lot of parts-is-parts to choose from!
I beg to differ sir...( insert evil grin here )...
:razz:
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142 Posts
I'm inclined to agree with Fattrat. I've always been skeptical of "bolt on" mods. Of course, some modifications will make a difference: performance carbs, increasing engine capacity, etc. But TORs and airbox mods? Forget it. My bike came with TORs and the dealer said that they add 9hp! Does anyone really believe that decreasing the backpressure of the exhaust will add a 20% increase in power? As for the air box, I'm sure that with the proper jetting, the hp will increase somewhat, but only by about 1-2 hp max, not worth almost $500 CAD in my opinion. All that said, I've never actually seen the difference in Dyno testing between a NARKed bonnie and a stock one, but from what I've read on this forum, the difference is negligable. But hey, I'd like to be proven wrong!
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40 Posts
I would also beg to differ ... is it worth $500? - probably not. But you can do the full bafflectomy, gut the airbox yourself and run the K&N cone filters, rejet, and you will enjoy a real change in the quality and quantity of power, i.e. more responsive and more willing to wind out. Or, you can ride it stock and still be perfectly happy.
But then ... it's hard to own one of the last bikes sold with carbs, and not carry on the tradition of "tweaking" and tuning ...
But then ... it's hard to own one of the last bikes sold with carbs, and not carry on the tradition of "tweaking" and tuning ...
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11,951 Posts
I doubt some of the claims in actual numbers, but nixing the airbox and putting on some free flowing pipes really makes the engine run freely, rev quicker and it is worth it for the sound alone. It is a sin for Triumph to muffle this motor so much.
It's important not to get caught up in the numbers too, an 8hp gain may not sound like a lot, but that's a large gain percentage-wise.
A big bore bonnie with aftermarket carbs, pipes, etc and cams is a raging monster, and will suprise plenty of "fast" bikes. 85 hp is very possible, and that's at the wheel, along with almost as much torque.
It's important not to get caught up in the numbers too, an 8hp gain may not sound like a lot, but that's a large gain percentage-wise.
A big bore bonnie with aftermarket carbs, pipes, etc and cams is a raging monster, and will suprise plenty of "fast" bikes. 85 hp is very possible, and that's at the wheel, along with almost as much torque.
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3,624 Posts
I'm glad to hear this feedback! I've been doing the mods to my 790 since 2004, a little at a time. I did the TOR's and felt a quicker bike. Might have to do with it "sounding" faster" but I understand that TOR's provide about 5/6 hp gain, or 10%. It was dynoed, with a stock box and K&N filter, at 61 hp and 47flbs. I will not get worked up over the numbers, because there are limitations on the bike as manufactured. I am only trying to keep the bike as a hobby and enjoy getting more out of it. I am debating the big bore/cams/carb update only because it changes the engine from a Triumph to a "whatever" and I am not certain of availability of parts for the bike down the road should they be needed. I would like the 790 to run with a Thruxton while retaining the T110 look. Should surprise a few people when it happens. Thanks for the great input. Keep it coming!
Two years ago, someone on this forum said that anything you do short of removing the airbox and running cone filters is just minor league stuff. GaryD was right on! The 790's really turn on with the airbox removed or modified to run with individual cone filters. HP increase--YES...mine dynos at 67.5 RWHp with no other performance mods except the NH Toga silencers! I have had zero problems with the carbs in over 15000 miles since installing the NARK. I have only had to sync the carbs once in that time--after the initial installation. It runs great in all Wx conditions down to 45 degrees F and up to 105 degrees F--haven't tested it beyond those temps. :-D Why does the NARK cost so much?--cause it's worth it. :-D
Larry
Larry
G
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·I installed the Bellacorse kit. They sent excellent instructions along with a very well manufactured unit. I also downloaded the NB instructions and used both to fill in the questions I had in doing the mod. The most important thing to do is lift rear of the bike WAY up after removing upper shock bolts and exhaust. I didn't have to remove the rear tire and used an engine hoist to get her up high enough to get the box out.
After the installation, I took it to have the carbs balanced and dyno'd. What a letdown... Only hit 59.7 RWHP. I'm running TOR's and 19 tooth front sprocket. The tech. at dyno station said the bike is running well (after tweaking) and the mixture is dead on with no flat spots so the jets included with my kit were sized correctly. The bike really does feel stronger and twisting the throttle gives instantaneous results. The sound is more throaty too, especially from 4-7krpm. Does anybody know if the 19tooth front sprocket will in-fact give lower HP ratings if taken at RW? In theory, I would think so... All in all, the most satisfying mod. I've done thus far regardless of the lower than expected HP gains.
After the installation, I took it to have the carbs balanced and dyno'd. What a letdown... Only hit 59.7 RWHP. I'm running TOR's and 19 tooth front sprocket. The tech. at dyno station said the bike is running well (after tweaking) and the mixture is dead on with no flat spots so the jets included with my kit were sized correctly. The bike really does feel stronger and twisting the throttle gives instantaneous results. The sound is more throaty too, especially from 4-7krpm. Does anybody know if the 19tooth front sprocket will in-fact give lower HP ratings if taken at RW? In theory, I would think so... All in all, the most satisfying mod. I've done thus far regardless of the lower than expected HP gains.
I did the British Customs air box mod. It wasn't that difficult to do. This video helped a lot www.rikkirockett.com/thurxtongarage_videos_airbox_menu.html
Good Luck
Good Luck
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