Doebeck TFI Settings

[eagle]

I have a 2001 Vulcan Nomad 1500 FI with 75,000 km.

I have a Doebeck TFI a K&N Air Filter and recently added Cobra True Dual Exhaust system.

What settings for the TFI seem to work for others out there with the same mods?

I'm getting a bit of sputtering coming out of the exhaust when backing off on the gas. I'm not sure which pot to adjust to reduce this sputtering, and if to turn the pot up to increase the setting or down to decrease the setting.

Any suggestions would be greatly appreciated.

[Cajunrider]

If it's popping on decel, you will need to insert a marble in the reed valve hose. If you're removed the reed valves already or have already marbled the hose, it sounds like you may be running a little rich. Try backing off a little on Pot #1. Mine was popping like crazy on decel until I blocked off the reed valve hose just below the intakes in the center of the right side. Not the hose on the bottom.....that's the crankcase breather.

[eagle]

I managed to marble the reed valve and I turned down pot 1. Just waiting for some dry weather here since once again it is a rainy day.

Thanks for your advice. I shall let you know if this works.

What purpose do the reed valves do? Does it make sense to remove them after installing aftermarket pipes? Is it fine to just leave them there in place with the line being marbled?

[Cajunrider]

I haven't removed mine yet. Most do remove them and get the coaster plates from Chuckster to blank off the openings once they are removed. Back to the TFI.....the marble will more than likely solve your decel popping. Adjust your #1 pot at warm high idle. Adjust it to the spot where the idle will be the highest with your cold idle knob (choke) pulled out. My highest idle is somewhere between 3:15 and 3:30. I backed it off to 3:00 and don't have ping with the open intake and V&H baggers. Before the TFI and open intake, it pinged anytime I climbed a steep bridge or hill under load.

[eagle]

What do you recommend pot 2 to be set at to start with the mods that I have made?

[blowndodge]

Eagle, here's the rub on the TFI (I have one too)

Generic settings are 3-5-9-1

Ideally you want to set the pots for best mileage while eliminating any pinging.

1st pot should be set so you can go up a long grade in very warm weather holding a steady throttle and the bike on pinging on steady throttle.

2nd pot would then be adjusted so that rolling on the throttle in the same test produces no pinging either.

[macmac]

BD , Made a typo and reversed pot 3 and 4.

Pot 4 is set ton 9 O Clock or the TFI won't work.

Pot 3 is set to off and maybe 1 for a reason and you may have that reason.

Pot is set on a dyno or by the seat of your pants and is like an accelerator pump on a carbed vehical.

Pot 1 should be set with pot 4 set to 9 O Clock, and alone, more so since your mods are not that close to most others having a left side air intake only.

After all the settings are where yout particular bike wants and you have matched pot 2 to your riding style, if then popping on decell happens that you can't hold a little throttle to stop the noises then pot 3 might be of some limited use to drown the cackel.

Also to conserve fuel you can move pot 4 a RPM counter only, to a lower value so long as the green and yellow lights I think flicker as does red on pot 4.

No red on pot 4 and you turned off that pot no matter where it is set to low.

No one can give another guys bike a set of numbers and have the that guy set it all by the numbers and get it right. 2 bikes varry, and so do 2 same but different fuel modual, as the parts are no mpre perfect than a circle and there is no perfect circle, other than in a mans mind.

TFI Pot 1 does increased fuel for idle and up to cross over mid RPM range.

Pot 2 adds fuel when you twist the wick

Pot 3 should not need to be used since a Nomad does well a cruise RPM as oem, but is foe adding fuel to other bikes that do need more fuel in cruise mods. This pot can drown out cackel.

Pot 4 is a RPM counter, and needs to be set at 9 O Clock in most cases, but may be turned back to count less RPM to a value where it's light flickers and that should not be under 4 O Clock probably.

[eagle]

Thanks to all for the great advice. I shall be adjusting the TFI tonight before a long awaited ride due to the cold or rainy weather the last few days.

[blowndodge]

spell check!!!

[macmac]

BD spell ck isn't going to reverse pot 3 nd 4. But I know a typo when I see one since I am the Typo King

Eagle, When setting pot 1 go past BEST RPM, go waaaay past it till you can tell the engine is flooding and waay over rich. Then come back to best, passing that to lean.

Allow time and let the engine tell you what it likes. Once you have best imagine there is 4 dots between the numbers like a clock say 2....3 and leave the best RPM plus one or 2 dots.

Rainy dat settings are in a weather LOW, not the best weather, at least I prefer Highs. It can make a difference. Ever notice how a well tuned engine wants to spin in Fall on a brisk day?

One nice thing about TFI is they reacted instantly and you can dial in a day if you want.

[dkdixie]

Pot 3, according to Tech support at Dobeck, should be set to 2 or even 3 IF you are getting a stumble or hesitation between gear shifts, IE: 1st to 2nd which seems to be fairly common.

[macmac]

Originally Posted by "dk dixie"

Pot 3, according to Tech support at Dobeck, should be set to 2 or even 3 IF you are getting a stumble or hesitation between gear shifts, IE: 1st to 2nd which seems to be fairly common.

First I heard of that, and I get no stumble between shifts, on the 06 nor the 01 when I had it.
One thing I don't understand is no one ever says when they set up a TFI the first time RPM goes so high twice now I had to set the black air knob lower, and even then the bike kinda ran away with me riding, as in it won't slow down rolling the throttle off.

Where by the fix was setting idle rpm lower yet.

My 06 starts like a champ too. So far for me it's just been basic book services, add on, oils and filters, but not one real repair except for the ft fender I smashed hitting a jeep.

[magoo]

I just installed my TFI this week and have pot1 at 2:45, pot 2 at 4, pot 3 at 1 and pot 4 at 9. my 08 is totally stock and the TFI eliminated hesitation between the lower gears. I still have pinging when I'm hard on the throttle in 4th and 5th. For example, in 5th at 70 mph when I hit the throttle, the engine will ping. What recommendation does anyone have for setting the TFI to elminate the pinging.

[blowndodge]

turn up the second pot to 5

[macmac]

magoo, pretty rich settings for a stock breather and exhaust, but if you got ping in a hard roll on, I agree with BD.