Do all true duals kill torque?
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Road Master
Joined: Sep 2005
Posts: 1,190
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RE: Do all true duals kill torque?
ORIGINAL: 05 Ultra
I put off gettting TDs because of all the hype on torque loss. The heat loss FAR excedes anything you may feel in torque loss.
Wish I did it lastyear...
Oh...Turbo38SFI? you have a GN?
I put off gettting TDs because of all the hype on torque loss. The heat loss FAR excedes anything you may feel in torque loss.
Wish I did it lastyear...
Oh...Turbo38SFI? you have a GN?
Yep, I've got an 86 w/14k miles on it. Have had about 10 of them over the years though. I get bored with it after a while and sell it to buy another one.
Road Captain
Joined: Dec 2005
Posts: 525
Likes: 2
From: NĂśdinge, Sweden
RE: Do all true duals kill torque?
ORIGINAL: blk06rk
All true duals hurt TQ. on other wise stock motors, Anybody tells you different is fooling theirself or don't know what their talking about, Some of the loss can be made up by adding other power adders like free flowing air filters, PC-3's and so on. True dual setups lower backpressure and lower backpressure kills Tq. And yes you will feel it.
All true duals hurt TQ. on other wise stock motors, Anybody tells you different is fooling theirself or don't know what their talking about, Some of the loss can be made up by adding other power adders like free flowing air filters, PC-3's and so on. True dual setups lower backpressure and lower backpressure kills Tq. And yes you will feel it.
True duals will not hurt!
But You're probably thinking of the fact that you can get even better TQ with other systems, especially 2-1 where the exhaust from one cyl helps evacuate the other.
I got Samsons true crossover and had with stock pipes 64FP on the rear wheel. With the first set of pipes (the straight ones, w/o baffles) I got 70. We then tried the ones with baffles and got 75!
So I gained 11 fp in TQ, with Samson True Crossover Fishtails W baffles.
Of course I could have got 5-6 more in TQ with another system. BUT I do like the looks and does not aim for maximum power in the first place.
If I did I probably would have choosen another bike.
Sorry that the picture still shows the pipes without baffles, new pic is comming (soon).
Cruiser
Joined: Feb 2006
Posts: 202
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RE: Do all true duals kill torque?
I got the performance baffles. Recently I heard about the reversion cones. Others I've talked with do say they do really make a difference in the back pressure the motor needs for making tq.
With the EPA BullS$*! flying around, someday I may need to go to the quiet baffles but for now BWAAAAA!!!
With the EPA BullS$*! flying around, someday I may need to go to the quiet baffles but for now BWAAAAA!!!
Banned
Joined: Jan 2006
Posts: 1,139
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From:
RE: Do all true duals kill torque?
Lets see.....
true duals
pros-
less heat
ability to tune each cylinder separate
sound better
allow more possibilities for performance with big mods
cons-
they do hurt tq a little
expensive ( compared to leaving the stock system alone )
I have ridden a bike with the stock system still in place and they do give you more tq down low in the rpm range. Not alot, but you will notice it if you do alot of riding in the 1800-2500 range. I find that I spend most of my time in the 2500-4000 range. That is why I have true duals and cams that come in at 2500 rpms. I think that every rider should evaluate how they ride, and mod accordingly....
nogood o~`o
true duals
pros-
less heat
ability to tune each cylinder separate
sound better
allow more possibilities for performance with big mods
cons-
they do hurt tq a little
expensive ( compared to leaving the stock system alone )
I have ridden a bike with the stock system still in place and they do give you more tq down low in the rpm range. Not alot, but you will notice it if you do alot of riding in the 1800-2500 range. I find that I spend most of my time in the 2500-4000 range. That is why I have true duals and cams that come in at 2500 rpms. I think that every rider should evaluate how they ride, and mod accordingly....
nogood o~`o
Cruiser
Joined: Aug 2005
Posts: 190
Likes: 0
From:
RE: Do all true duals kill torque?
I started out with Ness Big sucker, V&H duals w/Kerker slip-ons and a DFO. I think I noticed a small loss in torque at low rpm but, gained everywhere else. I have since switched to V&H Oval slip-ons and the V&H Fuelpak, I'll tell you, I don't feel any loss of torque now, just a gain through out the entire range! Oh, I should mention I'm currently running the stock air filter because the big sucker lets the crankcase breathers make an oily mess inside the air filter housing-if your going that route go with HD SE air filter setup, their breather tubes extend all the way into the intake throat so any oil gets burned along with your air/fuel mix. I'm going to try a K&N stock replacement filter in the stock housing myself.
Extreme HDF Member
Joined: Nov 2005
Posts: 16,125
Likes: 24
From: Linden New Jersey
RE: Do all true duals kill torque?
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
Not flaming, just asking questions..................
Road Master
Joined: Feb 2005
Posts: 867
Likes: 79
From: Bridgewater, NJ
RE: Do all true duals kill torque?
ORIGINAL: Bruce00
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
I'm just saying I don't care. Its not a canyon carver. Its a touring bike. Torque and horse power win races. I'm way past that now. Getting rid of the heat was way more important.
(even though I still have my 87 T-Type and building a 60 vette with the 3.8 turbo motor in it.
)I don't race my Ultra.
Extreme HDF Member
Joined: Nov 2005
Posts: 16,125
Likes: 24
From: Linden New Jersey
RE: Do all true duals kill torque?
ORIGINAL: 05 Ultra
I'm just saying I don't care. Its not a canyon carver. Its a touring bike. Torque and horse power win races. I'm way past that now. Getting rid of the heat was way more important.
(even though I still have my 87 T-Type and building a 60 vette with the 3.8 turbo motor in it. )
I don't race my Ultra.
ORIGINAL: Bruce00
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
I'm just saying I don't care. Its not a canyon carver. Its a touring bike. Torque and horse power win races. I'm way past that now. Getting rid of the heat was way more important.
(even though I still have my 87 T-Type and building a 60 vette with the 3.8 turbo motor in it.
)I don't race my Ultra.
Well your almost right...........TORQUE gets the bike moving and HP wins races. In the best of both worlds you would like to have both. But on a big fat touring bike I'd would want all the low down torque I could get, but thats me. I've heard the same ole crap about a touring bike must have duals to look right, but I march to beat of my own drummer
btw........my other vehicle has 700hp/840tq
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Cruiser
Joined: Jun 2006
Posts: 148
Likes: 0
From:
RE: Do all true duals kill torque?
ORIGINAL: Bruce00
Well your almost right...........TORQUE gets the bike moving and HP wins races. In the best of both worlds you would like to have both. But on a big fat touring bike I'd would want all the low down torque I could get, but thats me. I've heard the same ole crap about a touring bike must have duals to look right, but I march to beat of my own drummer
btw........my other vehicle has 700hp/840tq
ORIGINAL: 05 Ultra
I'm just saying I don't care. Its not a canyon carver. Its a touring bike. Torque and horse power win races. I'm way past that now. Getting rid of the heat was way more important.
(even though I still have my 87 T-Type and building a 60 vette with the 3.8 turbo motor in it. )
I don't race my Ultra.
ORIGINAL: Bruce00
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
Do you guys really think that the true duals are not hurting you down low torque, and even better, do you think that the large diameter true duals pipes help torque?
Not flaming, just asking questions..................
I'm just saying I don't care. Its not a canyon carver. Its a touring bike. Torque and horse power win races. I'm way past that now. Getting rid of the heat was way more important.
(even though I still have my 87 T-Type and building a 60 vette with the 3.8 turbo motor in it.
)I don't race my Ultra.
Well your almost right...........TORQUE gets the bike moving and HP wins races. In the best of both worlds you would like to have both. But on a big fat touring bike I'd would want all the low down torque I could get, but thats me. I've heard the same ole crap about a touring bike must have duals to look right, but I march to beat of my own drummer
btw........my other vehicle has 700hp/840tq
Ditto. Now I need to update my pic!
Also Thunderheader just came out with a new true duel thats suppose to stop hp loss.
Supporter
Joined: Nov 2005
Posts: 1,366
Likes: 11
From: Ozark, AL
RE: Do all true duals kill torque?
I put 32,000 + miles on my bagger last year. I have about 4000 on my Rineharts and they DO feel more powerful, they DO NOT feel slugish or lazy at the bottom end. Before you start the "you have cams" Cr*p I had the cams for about 1500 miles before the TD's. All the pipes did was wake the cams up even more. If all you see is two dyno sheets and one has more torque than the other, IT DON'T MEEN S**T. Unless you are comparing the EXACT same setup with the EXACT same dyno and tuner all they are is numbers. Your bike, before and after, that's all that matters. my .02 cents.
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