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Post by jdl357 on Mar 29, 2016 18:35:47 GMT -5
What's a good performing expansion pipe with good low end torque? I've currently got a technigas q-tre pipe that I like, but really needs high rpms for good torque, you guys recommend one?
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Post by stepthrutuner on Mar 29, 2016 21:13:59 GMT -5
Technigas RSII 70 was the best bottom end pipe I've owned. Dyno plots verify this. Still got a little left at a little over 10k too.
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Post by ryan_ott on Mar 30, 2016 9:59:55 GMT -5
Any pipe with a straight head pipe section should give you decent torque. The pg and the v8 would probally be a good choice depending on your cylinder. I have a stage6 pro rep and it has decent low end torque and will rev out to 11k. That could also be the port timing...
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Post by Lucass2T on Mar 30, 2016 10:15:04 GMT -5
Stage 6 street
Leovince SP3
Sito plus
You need a stock looking aftermarket pipe. The stage 6 street would be the best I think.
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Post by 2stroked on Mar 30, 2016 11:41:19 GMT -5
The resident expert, 190mech, could tell ya what you need. Pretty sure he'll chime in soon enough.
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Post by mclark999 on Mar 30, 2016 16:30:39 GMT -5
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Post by niz76 on Mar 30, 2016 17:58:11 GMT -5
A stock looking non-expansion pipe will give better torque than an expansion pipe, and I think the short fat expansion pipes are high revving and typically sacrifice low end grunt for it. A longer, skinnier expansion chamber should be lower RPM's and torquier. That's a pretty simplified explanation of pipes but seems to hold true- feel free to correct me if I'm mistaken!
I've always heard the Leo Vince ZX and ZXR's had great low-end power and a wide power band but of course they don't make them anymore. They were extremely popular so a used one should be pretty easy to find...
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Post by 190mech on Mar 30, 2016 18:47:34 GMT -5
What's a good performing expansion pipe with good low end torque? I've currently got a technigas q-tre pipe that I like, but really needs high rpms for good torque, you guys recommend one? All of the folks have given you very good advice!Aint no racing pipe with lots of low end..Look at their suggestions and pick the one you like,it'll do a good job for ya!!  |
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Post by moofus02 on Mar 30, 2016 19:50:16 GMT -5
I think my zx was better all over than my stock pipe but the stock one had a cat in it. I lightened the rollers and changed clutch springs but my 50 gets the front light taking off. Makes nice power but not much over rev. The Leo Vince pipes (tt,zx, zxr, gp )if you look at dyno charts look about the same. The difference is the rpm but the curve looks the same. Someone was running a gp on I think a street race with good results
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adlyman
Scoot Member
If you ain't pushing it, you may as well be pulling it!
Posts: 63 
Location: New Zealand
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Post by adlyman on Apr 5, 2016 22:41:17 GMT -5
+1 for the V8 pipe.  Best wheelie pulling pipe ever IMO! I've made the cheapest, crapiest Chinese BBK's around shine with these pipes. Very flexible low end grunter. |
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Post by ThaiGyro on Apr 13, 2016 7:11:59 GMT -5
I love this thread! I have been shopping and researching everything I can for my Honda TAO1E engine...similar to an AF18E, or maybe a Lead NH/SH50. Bore and stroke = 39.99/39.3.
My project will not be raced, I don't think. At least not in normal terms. Road racing 2-strokes requires you to ALWAYS have power "on the pipe", meaning you must keep rpm's in a power mode...which is very much exhaust port and pipe tuning and carb flow dependant.
If you seek more low and mid-range power, as I do...you find a pipe that is good in that range, knowing that you will likely sacrifice top end. For every notch in the top end belt, there are also things to give up. Idling...never had a high end 2-stroke that would, unless you don't mind idling above 2500 rpm. OK for racing..in fact great!
If you want to wheelie your scoot like a crazed kid? Go for the drag pipe, stock gearing and lots of fuel exchange. Yes, drag pipes are very low/midrange flow oriented. In fact, I saw a super fast 125 with a pipe than ran straight out the right. The Stage 6 Pro Replica or similar can provide great low and mid-range grunt, then tapers off at higher rpm's. In my book, that is text book street shit-n-git! You must understand the flow dynamics, or understand others setups and wish for the best.
The hard part for us performance seekers, In my mind, is to find a balance of all engine related bits.
I was lucky enough at a young age to work with a 2-stroke guru in Northern California. Rick Schell. Rick was/is a tuning master. He was good enough to have Yamaha of Japan have him do testing and product feedback. Guess what? He never failed to show their drawbacks. (I think he was also a Daytona 200 winner, on the beach) Later in life, Rick became the brain/tuner behind the 250 GP Championship effort of Roland Sands, for many AMA years, including the US Championship in '09.
Rick was, in my past, the best 2-stroke expansion chamber designer of the modern era...period. Yes, we blew up shit! When race day came, we took my lack of experience and combined it with tuneable power, gearing and a few hard words...and kicked some ass. I had a 4th place finish on a tired TA125 Yamaha, against all other 125 water pumpers...35 bikes! Ricks pipes were pure mid-to-top end power! Can you say center-bleed? He gave me a set of pipes that blew the seals out at 12,500 rpm...35+ hp in 1979.
I too, am seeking the other end.
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Post by mclark999 on Apr 13, 2016 10:47:52 GMT -5
Looking at the curves, the Gianelli Next makes pretty good low rpm HP and has some top end too.  |
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