View Poll Results: Which True Dual Exhaust DO You Prefer and Why
Rinehart
26
24.76%
Rush
10
9.52%
Vance and Hines
45
42.86%
Fullsac
5
4.76%
Fulemoto
5
4.76%
MGS
14
13.33%
Voters: 105. You may not vote on this poll
True Duals Question and Survey
#1
True Duals Question and Survey
I have the MGS true duals and love the look and sound. However, one small issue I have with them is the placement of the rear cylinder 02 sensor. It is back by the left rear passenger peg, infront of where the muffler attaches. From what experienced tuners are telling me is that 02 sensor placement and position is critical to performance.
Being that the rear sensor is so far back its catching cooler reversion air and giving mixed signals to the ecm. I was told the sensor should be same distance as the stock pipe for a more accurate and consistent reading.
Seems everytime I download my dyno tuned map the bike runs great, and slowly over time the popping starts in.
So Im now thinking of getting a new dual setup. True duals sound great. Does the 2-1-2 sound as good? I know Ive read it gives slightly better performance.
Any suggestions or recommendations out there? Either true dual or 2-1-2? Can you post pics as well?
Im hoping I can sell these duals and cover cost of new/used setup. Some people like the decel popping sound but it just drives me nuts.
Thanks for your feedback.
Being that the rear sensor is so far back its catching cooler reversion air and giving mixed signals to the ecm. I was told the sensor should be same distance as the stock pipe for a more accurate and consistent reading.
Seems everytime I download my dyno tuned map the bike runs great, and slowly over time the popping starts in.
So Im now thinking of getting a new dual setup. True duals sound great. Does the 2-1-2 sound as good? I know Ive read it gives slightly better performance.
Any suggestions or recommendations out there? Either true dual or 2-1-2? Can you post pics as well?
Im hoping I can sell these duals and cover cost of new/used setup. Some people like the decel popping sound but it just drives me nuts.
Thanks for your feedback.
#3
#4
DUH....What the hell was I thinking posting about an 2009 header!!!!!! He has true duals....
My MGS true duals came with the bungs in the same area as my 09 head pipes. I'm assuming the 2010's on up have the bungs further away from the heads? Not sure if the 02 sensors would reach but why couldn't the 2009 true dual pipes fit on a 2010 model??
My MGS true duals came with the bungs in the same area as my 09 head pipes. I'm assuming the 2010's on up have the bungs further away from the heads? Not sure if the 02 sensors would reach but why couldn't the 2009 true dual pipes fit on a 2010 model??
#5
DUH....What the hell was I thinking posting about an 2009 header!!!!!! He has true duals.... My MGS true duals came with the bungs in the same area as my 09 head pipes. I'm assuming the 2010's on up have the bungs further away from the heads? Not sure if the 02 sensors would reach but why couldn't the 2009 true dual pipes fit on a 2010 model??
2010 Limited with some stuff
#7
Having that left sensor in that position is wrong. It needs to be the same distance from the head, by less than 10" difference, to the original position. Preferably no more than 2" off if possible. You should be able to find someone to weld in a new 12mm bung.
Here is why this may be the wrong spot. The ECU is programmed to know that what it sees at the stock point in the pipe is a certain number of exhaust pulses AFTER the pulse that just fired. Narrow band O2s, like come on our bikes, read each and every exhaust pulse. SO... for ***** and giggles... say the ECU is programmed to 'know' what it is seeing at the O2 is anywhere from 20-100 pulses late... get me? It depends upon the rpm of the engine and it will keep track. Now... move that O2 to a posistion that WOULD be reading 45-145. This is NO WAY adjustable with any tuner going and just Fs up the signal. The bike's tune goes away after a bit because youre sending bad data right from the start.
With me? If not... I can try to explain better, if need be.. Steve Cole told me that those 12mm bungs can be moved like 4-5" either way (away or towards the head), but any more than that it will start reading the wrong pulses all the time. And... he said it would be better to be an inch or two closer to the head than stock if need be. So... me, and I AM going to TIG in some new bungs on the old D&D, I am going to shoot for as close to stock as possible, by using a string run down the pipe to measure with. We are in the same boat, my Brother.
So... measure the distance from the head on the stock pipe, then measure the distance on the new pipe and you will see where that new bung needs to go.
V&H is NOTORIOUS for placing bungs in the wrong place. A LOT of tuners, and even Steve have called and talked to V&H about this........ to no avail.
Here is why this may be the wrong spot. The ECU is programmed to know that what it sees at the stock point in the pipe is a certain number of exhaust pulses AFTER the pulse that just fired. Narrow band O2s, like come on our bikes, read each and every exhaust pulse. SO... for ***** and giggles... say the ECU is programmed to 'know' what it is seeing at the O2 is anywhere from 20-100 pulses late... get me? It depends upon the rpm of the engine and it will keep track. Now... move that O2 to a posistion that WOULD be reading 45-145. This is NO WAY adjustable with any tuner going and just Fs up the signal. The bike's tune goes away after a bit because youre sending bad data right from the start.
With me? If not... I can try to explain better, if need be.. Steve Cole told me that those 12mm bungs can be moved like 4-5" either way (away or towards the head), but any more than that it will start reading the wrong pulses all the time. And... he said it would be better to be an inch or two closer to the head than stock if need be. So... me, and I AM going to TIG in some new bungs on the old D&D, I am going to shoot for as close to stock as possible, by using a string run down the pipe to measure with. We are in the same boat, my Brother.
So... measure the distance from the head on the stock pipe, then measure the distance on the new pipe and you will see where that new bung needs to go.
V&H is NOTORIOUS for placing bungs in the wrong place. A LOT of tuners, and even Steve have called and talked to V&H about this........ to no avail.
Last edited by wurk_truk; 02-17-2014 at 04:29 PM.
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