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[bribe36]

I just installed the 2" Fullsac cores tonight and drilled out the cat a few weeks ago. I've been reading the posts and this seems to be a pretty common mod. Just wondering what everyone else is has done or will be doing for the next step. I will be getting a tuner, but some say no need cause the O2 sensor will adjust. Any suggestions??

[LarryB]

I'm with you on the Mod. OK stock bike runs lean to start, keep checkin your plugs. Then you let more air out faster with the Cat out, and still again with the baffle change. You have a good deal of air coming in with the stock breather. Only thing missing is more fuel, because now it's really lean. Can't run it high rpm with doing some damage after while. Colder plug would help but doesn't work with next idea.
You need fuel/air management system. PC, PC111, TM, FP, TTS systems all trick the system to running richer. the Super SERT actually works best for your bike, easy install.
Then go with a Trip Plat plug should give more. The Heavy Breather gives very little as far  volume compared to the SERG stock one.
Did you leave the insulation in/ or out?

[guppytrash]

I'm with you on the Mod. OK stock bike runs lean to start, keep checkin your plugs. Then you let more air out faster with the Cat out, and still again with the baffle change. You have a good deal of air coming in with the stock breather. Only thing missing is more fuel, because now it's really lean.

Your bike is closed loop right?  In closed loop EFI you are running 14:6 fuel/air ratio before your mods.  After your mods you are still running 14:6 fuel/air ratio.  Once more if you put on a SERT and do the basic map for air cleaner and performance exhaust you will still be running 14:6 fuel/air ratio in closed loop. 
Can't run it high rpm with doing some damage after while.

I have been told high rpm and WOT are not closed loop.  So you may be correct.  My guess is you are very rich in WOT even after mods.  I would love to know if the extra power found in the dyno tunes that have been done was found by actually leaning the fuel/air ratio at WOT.


Colder plug would help but doesn't work with next idea.

You need fuel/air management system. PC, PC111, TM, FP, TTS systems all trick the system to running richer. the Super SERT actually works best for your bike, easy install.

I did the same mods as you and I did add the SERT, but not before putting some miles on it with the mods and no SERT.  I could not tell the difference after I added the SERT with base map. 
Then go with a Trip Plat plug should give more.

More what?  I would love to get some education on this whole spark plug thing.  There very well could be something to this but I am not convinced.
The Heavy Breather gives very little as far  volume compared to the SERG stock one.
Did you leave the insulation in/ or out?

I am not an expert but there are a few here who are so maybe this will motivate them to jump in and teach us all something. 
Closed loop EFI is misunderstood by many. 

[Iglide]

1) Removed the cat
2) Installed the Fullsac 2" baffles
3) Installed Heavy Breather
4) Installed SE Spark Plugs
5) Good Dyno tune using Super SERT (other tuners will likely work as well)

Next:
Cams and mild head work

[bribe36]

Would a tuner (SERT,PCIII, whatever) have any positive effect on a stock 110 motor without any mods?

Also, does this motor really need a cam and head work. I think it's got plenty of "GO".

What breather does everyone like?

[HDDOCFL]

The 96 and 103 and the 110" engines all stay in closed loop till the engine hits 4000 RPMs, with stock set ups they run right around 14.6 to 1 AFR changing exhaust and intake will still result in a 14.6 to 1 AFR up to 4000 RPMs, To me this is way to lean and all of them need more fuel to run cooler weather stock exhaust or not. JMO.   Doc

[FLSTFI Dave]

The 96 and 103 and the 110" engines all stay in closed loop till the engine hits 4000 RPMs, with stock set ups they run right around 14.6 to 1 AFR changing exhaust and intake will still result in a 14.6 to 1 AFR up to 4000 RPMs, To me this is way to lean and all of them need more fuel to run cooler weather stock exhaust or not. JMO.   Doc

I agree.  It seems all Harleys air cooled bikes run lean from the Factory.  I know my 03 was lean stock.  This is done to meet EPA rules.  AFR should be in the 13.4 or so to 1.

[GregKhougaz]

1) Removed the cat
2) Installed the Fullsac 2" baffles
3) Installed Heavy Breather
4) Installed SE Spark Plugs
5) Good Dyno tune using Super SERT (other tuners will likely work as well)

Next:
Cams and mild head work

Iglide is right on.  Finally got my heavy breather delivered and installed it last week.  Then to the HD dealer and dynojet.  They used the SERT but claim to have some way of keeping it from HD.  I now have a computer "Key" w/ the software.  My starting numbers with mods but pre tune were 85.02 hp and 99.74 torque.  Remember you really can't compare numbers between or among different dynos because there is no standard.  Final numbers:  89.07 hp and 109.22 torque.  These starting numbers were not "stock" but with:

Drilled out CC
Installed:  2" fulsac cores
              SE Plugs
              HD heavy breather (advantage to this is the plenum which directs the air flow, not just the amount of air)

The curves were good with a lot of usable power from 2K rpm's to 5500 where the starting numbers really fell off after 4500.  I was very lean to start with an A/F above 14 through out the rev range.  Now, I'm right about 13.9 - 14.1 and it richens as the rpm's rise.  The tech is supposed to e mail the print outs to me and I'll post when he does.  Running much cooler now.  Mod on!

GK

[Highjagger]

Just let me say that I have a Thundermax in my 96cui and think that this is the very best you could do , if there would be one offered in future times for the 09ers ( cause of the wireless throttle ) , my AFR is about 13 , never more .( controlled it 4 weeks ago )
In the closed loop with the wideband lambdas , i would not take an other tuner , I am convinced that the TM is the non plus ultra . Allthough I had a " oil running out " and the dealer knew about the TM , he made the warranty-repair . Easy to install ( if you know where the ECM is located at your bike ) , easy to map , and no additional fine-tuning is need from a specialist who only wants to rob your bucks . The TM is learning and fine-tuning himself ( in the closed loop ) .
Just write to Zippers.com , Randy Dull is the man who knows the facts whether and when the 09fitting-TM is coming , he makes a good support job overthere . http://www.thunder-max.com/ .
What are fulsac cores ?

[Highwaystar]

finally someone explains the thundermax advantage first hand. I too have seen the effects with a good base tune. I am on the list for the upcomming 09 release with electic throttle. Thanks Highjagger.

[Highjagger]

I think it`s worth to wait for the 09-fitting Thundermax - and then you will win the race , Yeah !