2014 FLHTKSE and ThunderMax

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Jul 27, 2017 | 12:03 PM

fxe77rebel

Thread Starter

Cruiser

Joined: Jul 2007

Posts: 107

Likes: 4

2014 FLHTKSE and ThunderMax

The bike is basically stock (bought used with 1262 miles - assuming stock). I added Fuelmoto headpipe (Jackpot Super Duals & Crossover), and ThunderMax, stock mufflers. Terrible starting issues since ThunderMax install, but usually only first start of the day. After fighting to get it started it runs pretty well. Have done all the suggested things - new battery, clean / dielectric grease connectors (throttle body), adjust both initial and cranking fuel, even loaded modified map from ThunderMax support. Now have experienced limp mode since install of modified map.

The question is, has anyone successfully ran this setup or similar with ThunderMax? Do I have a faulty module or have they just not been able to get it right with the Rushmore's?

Jul 27, 2017 | 12:16 PM

bigskyroadglide

Outstanding HDF Member

Joined: Sep 2010

Posts: 2,630

Likes: 185

From: Mountain West, Big Sky Country

i ran a thundermax on my 120R briefly after install.

hard start was a routine occurrance. had zippers work on it for a couple hours in daytona.

it improved but was never perfect.

put stock ecm back on and went with PV and dyno tune

1000% improvement.

my experience. sold Tmax, never had another

Jul 27, 2017 | 05:22 PM

15_MG_SG

Cruiser

Joined: Mar 2015

Posts: 115

Likes: 32

From: Palm Bay FL

I had a Powervison with a tune done by a vendor the bike ran good but always ran hot. Living in Florida didn't help things especially in the summer.

Installed a Thundermax the bike starts easy runs cooler never ran better.

Both are good systems I just prefer the wide band of the Thundermax my preference.

Make sure the vacuum plug is not missing on the throttle body.

I heard the Thundermax was dependent on good battery voltage but you said you got a new battery.

Jul 27, 2017 | 06:52 PM

Chuck U. Farley

Cruiser

Joined: Nov 2014

Posts: 205

Likes: 8

From: South Carolina

I had a Thundermax installed at Myrtle Beach last year, nothing but great performance and zero issues with starting. Very happy with it. Cycle Solutions did the install and dyno.

Jul 28, 2017 | 05:20 AM

Tn.Heritage

Grand HDF Member

Joined: Nov 2004

Posts: 3,917

Likes: 184

From:

Personally you couldn't give me one of the darn things, too may issues I've seen over the years with the blundermax. You need a good PV and a good tune, you want be sorry. Put the max on ebay and get out while you can !!!!!

Jul 28, 2017 | 12:26 PM

fxe77rebel

Thread Starter

Cruiser

Joined: Jul 2007

Posts: 107

Likes: 4

Thanks.

I ran a ThunderMax on my '10 LTD, no issues. I went this direction because I also like the built in autotune. (wide band sensors) I shipped it back to Thunder Heart today for evaluation. Hopefully they determine I got a lemon and replace it. Including the cost of the new battery (which I don't think I needed) I'm in close to a grand. Hard pill to swallow.

Jul 30, 2017 | 06:58 AM

Tn.Heritage

Grand HDF Member

Joined: Nov 2004

Posts: 3,917

Likes: 184

From:

Quote:

Originally Posted by fxe77rebel

I feel for ya man, I've got a friend who's TM did sort of the same, it was one excuse after the other and it never would run right, it was sent back to them and of course nothing was wrong. Finally they pulled it off and put the stock ecm back and tuned it with a PowerVision and all was well and still is. I think he may have gotten 3 to 400 out of the TM but he lost a lot also.

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Jul 30, 2017 | 04:47 PM

merdahl

Road Master

Joined: Nov 2007

Posts: 868

Likes: 8

From: AZ

Been running a TMax on my softail for years. Probably 80k miles. During that time had 2 failures, both IAC driver. Both failures occurred immediately after washing the bike. Stopped starting it after washing it and haven't had a problem since.
IAC driver failure will cause the bike to idle very poorly, if at all. Get the RPMs up and it runs fine. Both failures were covered under TMax warranty.