Thundermaxx adjustment

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Oct 24, 2007 | 04:30 PM

Yogibear

Thread Starter

Tourer

Joined: Sep 2005

Posts: 277

Likes: 0

From: Kelowna, BC

Thundermaxx adjustment

Hey all;

Just had a Thundermaxx system installed along with Rinehart Tru duals on my 2003 FLHTCI.

Sound is great, power is great etc. The thing that seems to be out of ordinary
is low end stumbling. IE at lights giving the throttle a little causes the engine to sputter.
Similarly on speed reduction on the lower end without throttle it sputters and backfires
and if I add throttle it's like there is nothing there. The revs drop to 500RPM when clutch pulled in
and runs rough for a bit.

Shop says this is normal and I need to relearn driving technique. Huh? Also that if I want up end power
then this is the price. These guys have been pretty good to me (bike) but I wonder. They are using a "custom"
map not the generic one.

I accept that the HD ECM was designed for the whole power scale but this seems kind of off for me.

Is this "normal"?? Suggestions?

Thanks

Dennis

Oct 24, 2007 | 04:44 PM

Bob

Road Master

Joined: Aug 2006

Posts: 1,065

Likes: 4

From: Lantana, Florida Crew

RE: Thundermaxx adjustment

Quote:

ORIGINAL: Yogibear
Shop says this is normal and I need to relearn driving technique. Huh?

The only "driving technique" that I had to relearn was that I no longer had to anticipate
when the bike would unexpectedly stall or surge, while simultaneously roasting my "chestnuts".

Oct 24, 2007 | 04:49 PM

bigbluff

Intermediate

Joined: Oct 2007

Posts: 31

Likes: 1

From:

RE: Thundermaxx adjustment

If you got the Autotune module with it, you may just have to ride it for a few days for it to "learn" the proper AFR. Sounds like they used a poor base map to start from. If you have your SmartLinkIV software installed on a laptop, you could upload one of Zipper's base maps and might get it running better sooner. Otherwise, just ride it for 30 miles or so. Then shut it off, start it up, and ride another 30 or so. Shut it off, start it up, and keep doing that in order to get it to learn what it needs.

Oct 24, 2007 | 04:56 PM

Paniolo

Outstanding HDF Member

Joined: Apr 2005

Posts: 2,106

Likes: 12

From: SoCal

RE: Thundermaxx adjustment

You may also want to check the MAP. Sometimes the MAP Zippers loaded into the ECM before shipping is not the one your bike should use, at least that was the case in my Zippers ECM. Your symptoms should not be happening regardless of how much time you allow it to tune. Off idle stumble is not right. The best thing to do is review their MAP listing and definitions, and see which one is closest to your build.

Good luck

Oct 24, 2007 | 05:11 PM

Arcane

Road Master

Joined: Jan 2007

Posts: 971

Likes: 2

From: Mid USA

RE: Thundermaxx adjustment

My T-Max has never given me problems like those that you are experiencing. It could be a problem with the map; it could also be the IAC (idle air control) that is causing the problems. Has the shop that installed your T-Max installed several of the systems or is the procedure relatively new to them.

Arcane

Oct 24, 2007 | 08:46 PM

Paniolo

Outstanding HDF Member

Joined: Apr 2005

Posts: 2,106

Likes: 12

From: SoCal

RE: Thundermaxx adjustment

Quote:

ORIGINAL: Arcane
It could be a problem with the map; it could also be the IAC (idle air control) that is causing the problems.

Arcane brought up a VERY important point. If the IAC is not properly set, your whole tune will be off.

1) Check to make sure you have the right MAP for your build
2) Set the IAC correctly according to the T-Max manual

Good Luck