2019 M8 Stage1 tune backfire
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Stage II
Joined: Sep 2019
Posts: 2
Likes: 0
From: New Zealand
2019 M8 Stage1 tune backfire
Hi Guys,
I have a 2019 Softail Slim with V&H Eliminator Slip Ons and a Stage1 done by the dealer. Now I have a lot of backfire when i decalerate and it feels like the engine has less performance then before the tune? Any ideas?
cheers,
Rene
I have a 2019 Softail Slim with V&H Eliminator Slip Ons and a Stage1 done by the dealer. Now I have a lot of backfire when i decalerate and it feels like the engine has less performance then before the tune? Any ideas?
cheers,
Rene
Road Warrior
Joined: Jul 2014
Posts: 1,584
Likes: 520
From: VA
I assume the dealer used the HD tuner. If so you have 2 choices. Ditch the V&H mufflers for the HD Street Cannons. Ditch the HD tuner for a Power Vision tuner. The HD tuner is not set up for and doesn't have a map for the mufflers you are using. To work right the HD tuner needs specific HD parts and has very little adjustment.
Club Member
Joined: Dec 2014
Posts: 10,734
Likes: 3,755
From: SWFL
If you didnt already, put quiet baffles in the slip ons. M8s dont do well with too open pipes. That should fix your perceived performance loss and reduced the decel popping. Theres not much choice in tunes with the SE tuner. There is only one stage 1 tune. You could try a few autotunes to smooth out the VEs. The deceleration pop was there with your stock pipes, you just didnt hear it. With loud v&h pipes, your now hearing it...
Tourer
Joined: Aug 2019
Posts: 273
Likes: 151
From: Colorado
I've had a bit of the same even with the SE Street Cannons.
An observation...I've run a few smart tune sessions, and the SE tuner does not have enough tuning range to properly fuel even the street cannons, at least on my bike. The amount of changes in the VE tables is limited to a 4% change over the base SE stage 1 map. My VE tables (rear in particular) is loaded with red cells.
The SE tuner is quite disappointing, but at this point, I am not familiar enough with either HD or this engine to feel comfortable ruining the warranty.
An observation...I've run a few smart tune sessions, and the SE tuner does not have enough tuning range to properly fuel even the street cannons, at least on my bike. The amount of changes in the VE tables is limited to a 4% change over the base SE stage 1 map. My VE tables (rear in particular) is loaded with red cells.
The SE tuner is quite disappointing, but at this point, I am not familiar enough with either HD or this engine to feel comfortable ruining the warranty.
Road Warrior
Joined: Jul 2014
Posts: 1,584
Likes: 520
From: VA
I've had a bit of the same even with the SE Street Cannons.
An observation...I've run a few smart tune sessions, and the SE tuner does not have enough tuning range to properly fuel even the street cannons, at least on my bike. The amount of changes in the VE tables is limited to a 4% change over the base SE stage 1 map. My VE tables (rear in particular) is loaded with red cells.
The SE tuner is quite disappointing, but at this point, I am not familiar enough with either HD or this engine to feel comfortable ruining the warranty.
An observation...I've run a few smart tune sessions, and the SE tuner does not have enough tuning range to properly fuel even the street cannons, at least on my bike. The amount of changes in the VE tables is limited to a 4% change over the base SE stage 1 map. My VE tables (rear in particular) is loaded with red cells.
The SE tuner is quite disappointing, but at this point, I am not familiar enough with either HD or this engine to feel comfortable ruining the warranty.
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Stage II
Joined: Sep 2019
Posts: 2
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From: New Zealand
Thank you all for the reply. I had the slip ons on the bike for 2 weeks with stock air filter and no tune because we had to wait for some parts and to make sure I am happy with the overall sound of the pipes and there was no pop/backfire at all and the performance was great. Just thought to let you guys know.
cheers,
Rene
cheers,
Rene
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Seasoned HDF Member
Joined: Feb 2009
Posts: 5,642
Likes: 1,985
From: Cleveland Zoo
Thank you all for the reply. I had the slip ons on the bike for 2 weeks with stock air filter and no tune because we had to wait for some parts and to make sure I am happy with the overall sound of the pipes and there was no pop/backfire at all and the performance was great. Just thought to let you guys know.
cheers,
Rene
cheers,
Rene
Wanted to add, the S&S exhaust I have now along with a high flow A/C is louder and probably flows more but preforms great, it's tuned with a Power Vision.
Last edited by OldMike; Sep 7, 2019 at 02:40 PM.
Club Member
Joined: May 2010
Posts: 1,834
Likes: 87
From: Stokton, CA
My 2017 Heritage had stage 1 with street cannons SE backing plate and filter w/stock Breather cover and HD tuner....Bike ran great.
Now my 2019 Slim with stage 1 W/S&S 2:1 SE Backing plate & Filter HD tuner Bike runs extremely well....
I would take it back to dealer....
Now my 2019 Slim with stage 1 W/S&S 2:1 SE Backing plate & Filter HD tuner Bike runs extremely well....
I would take it back to dealer....