Air intake mods...... Definitive results - Page 21 - Triumph Forum: Triumph Rat Motorcycle Forums
Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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post #201 of 212 (permalink) Old 11-29-2012, 03:14 PM
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Ah! This is an high performance airbox intake from an husqvarna TC 250R
There it is, the "reverse" bell mouth.
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post #202 of 212 (permalink) Old 11-29-2012, 07:15 PM
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Suck on this.... errrr... these!





/M

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post #203 of 212 (permalink) Old 11-29-2012, 09:30 PM
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Originally Posted by Retro-Racer View Post
Suck on this.... errrr... these!...

Pity they have chrome-cap K&N's, eh?
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post #204 of 212 (permalink) Old 04-16-2013, 08:36 AM
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It's a sound control device loosely slotted inside the airbox. Its purpose is to reduce the intake roar noise although it also robs you of around 3 hp. To recover those hp, carbed bikes need re-jetting and EFI bikes need re-mapping of the ECU as well as air intake snorkel removal.

It's the yellow thing shown here:



Removal instructions and an explanation of its purpose are all over this forum and also at
TTP's site:

http://www.triumphtwinpower.com/triu...le-removal.php
Could one not compensate for the "lean runnning " by adjusting the pilot screws? Is a re -jet absolutely necessary? I just am reluctant to get into carbs and the mystery of corect jets etc.
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post #205 of 212 (permalink) Old 04-16-2013, 08:47 AM
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Simply put:

The pilot screws adjust the air/fuel mixture at/just off idle.

Needle height affects the mixture around mid throttle openings.

Main jet size affects the mixture at full throttle.

This is an oversimplification, but in general you won't normally get away with adjusting just one fuel circuit if you make significant changes to the intake and/ or exhaust systems.

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post #206 of 212 (permalink) Old 07-28-2013, 11:43 PM
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well this thread should never die. after heavy searching in the forum and reading a good deal of Ventura's, Pieman's, and Forchetto's post (for months) I finally got to work on my 2006 Scrambler. got a 12 pack and spent Saturday in the garage. pulled the baffle from the airbox, installed new idle mixture screws ( had to fashion a homemade fitting to get the d screws out), put in a TTP breathe bellmouth and DNA filter, threw in 135 mains with the stock 40 pilots, and put on D&D slips ons. Im at 1.75 turns on the idle mixture screws but not totally sold on that setting yet.

Im extremely happy with the results but it is difficult to do this many things at once and decide how to adjust. The stock scrambler needles are in now with one shim but I have thruxton needles on the way. The top end pulls evenly all the way to 100mph (and quickly) I think after reading enough about other peoples trials I got pretty close first try.

two questions.

1) I didn't pull the baffles from the d&d pipes but they seem pretty open and flow a lot of air. with jetting and intake mods of this nature should I pull them or leave them be if the bike is running well and it sounds good to me??

2) I feel as if I may of gotten close to nailing the settings with the stock scrambler needles with one shim. when I put in the thruxton needles should I start with no shim?

Last edited by strafkommando; 07-29-2013 at 12:03 AM.
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post #207 of 212 (permalink) Old 07-29-2013, 11:07 AM
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Are the Truxton needles richer,leaner or the same as 08 Bonneville needles?
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post #208 of 212 (permalink) Old 07-29-2013, 11:41 AM
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Quote:
Originally Posted by strafkommando View Post
two questions.

1) I didn't pull the baffles from the d&d pipes but they seem pretty open and flow a lot of air. with jetting and intake mods of this nature should I pull them or leave them be if the bike is running well and it sounds good to me??

2) I feel as if I may of gotten close to nailing the settings with the stock scrambler needles with one shim. when I put in the thruxton needles should I start with no shim?
1) Leave them for now as it runs well and sounds good to you. If you need more air flow later you have those baffles you can pull!

2) Can't help on that one. Really need to on a dyno for that type of "fine" tuning I would think.

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Originally Posted by racerdave1 View Post
Are the Truxton needles richer,leaner or the same as 08 Bonneville needles?
I think they just have a slightly different taper at the end.

If someone knows more please speak up.

2009 America with some mods, a lot of fun that I can ride all day. (sold and miss my 2008 Bonneville, a great daily driver)
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post #209 of 212 (permalink) Old 07-29-2013, 12:55 PM Thread Starter
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Quote:
Originally Posted by racerdave1 View Post
Are the Truxton needles richer,leaner or the same as 08 Bonneville needles?
Quote:
Originally Posted by strafkommando View Post
I feel as if I may of gotten close to nailing the settings with the stock scrambler needles with one shim. when I put in the thruxton needles should I start with no shim?
The Thrux needles are richer than standard.

Here's an dyno A/F trace comparing the two. The richer one is the Thrux needle....



V.

2006 Scrambler, VARK'd, FCR39's & DNA's, 790 In-cam, Pieman'd igniter, Zard 2:1.
2005 Thruxton Black, with ARK, FCR 39's & Uni's, Retimed 790 cams, Barnett clutch and suchlike!!

Last edited by Ventura; 07-29-2013 at 12:58 PM.
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post #210 of 212 (permalink) Old 07-29-2013, 01:14 PM
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Ventura i think i saw you post that on another thread which is what made me grab some thrux needles anyway . from my understanding the shim usually richens the mix as well (i believe). that being said with the thrux needles ill start with no shim and leave the baffles in the D&D pipes for now. see how that feels. tinker with my idle mix screws on the low end then maybe shoot for a dyno run.

the help is much appreciated. i only get about 6 days a month with my bike so its harder to do things trial and error
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