Changing headers
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Tourer
Joined: Jun 2007
Posts: 459
Likes: 35
From: Mission canada
Changing headers
I just purchased V&H true dual headers for my SGS and they are telling me at the dealer I need a tuner and for bike to be dyno tuned, nothing else has been changed I've check on this forum and some say don't worry about it others say to get a tuner. I just need to know if I can safely ride the bike ie not to lean. I will most likely change the A/C and slip-ons at some point but not just yet. I emailed V&H asking there opinion but haven't heard back from them. Thanks
Elite HDF Member
Joined: Nov 2011
Posts: 3,513
Likes: 116
From: OKC
LOTS of opinions. I changed exhaust, lost the cat, aftermarket mufflers, stage 1 intake on my Dyna. Put Xieds on it and by the plug readings I was never lean. No pop, no detonation, etc, ran 87 octane gas in it, etc. hauled ***, too.
Delphi is very adaptable. Could I have gained some HP & torque by spending the $$ for a tuner and dyno runs? Most likely yes, but at a point of diminishing returns. Depends what you are looking for....
Stellar HDF Member
Joined: Aug 2012
Posts: 2,664
Likes: 184
From: Indiana, USA
What year is the SG? Your engine is an air pump. The only way to change the Air Fuel Ratio (AFR) is to pass air thru at a faster rate. If you do not change your intake or filter and you do not change your exhaust the air flow rate will most likely not change enough to make a difference. If you have a newer SG with a catalytic converter you have narrow band O2 sensors and the engine management system will try to maintain the factory settings.
Intermediate
Joined: Jan 2014
Posts: 37
Likes: 0
From: Indiana
If you don't get it tuned and there is trouble because of the headers......will the dealer say its not covered under warranty? That would be my concern.
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Ultimate HDF Member
Joined: Apr 2010
Posts: 7,138
Likes: 26
From: Southern Oregon
Q: will the dealer say its not covered under warranty?
Only if what you did caused the warranty claim
Only if what you did caused the warranty claim
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Extreme HDF Member
Joined: Jun 2007
Posts: 12,653
Likes: 18
From: Broken Arrow, Oklahoma
Put 'em on and ride it. You'll know pretty quick if you need anything additional. Since you're still running the stock A/C, and the stock mufflers, I'm betting you won't. But, if you get a lot of decel pop, or even a backfire now and then, you might consider either the Xieds or the dealer's download, which is a lot cheaper than a tuner and dyno run. Especially since all you're wanting to do is get rid of some heat caused by the CAT.
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Tourer
Joined: Jun 2007
Posts: 459
Likes: 35
From: Mission canada
Thanks for the advice all I want is to get rid of that heat from the cat nothing more , any reason why the dealer is telling me I need a tuner and dyno if all I'm doing is changing the header pipe why are they insisting on the dyno.