- Dit onderwerp bevat 164 reacties, 40 deelnemers, en is laatst bijgewerkt op 15 jaren, 8 maanden geleden door .
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i also think the exhaust is way too long ! but yeah still its some good progress !
and looks quite alot like a calibrata…but yeah shorten it and ”speedbuxy” is quite right 😉
speedbuxy :
Why the exhaust have such a long part of straight pipe?Because a long header wil improve low-end torque and it is less difficult to fabricate.
AW50-4t | 13.13 | Gianelli Citypower | 3.2Nm@6000rpm | 3.0pk@6700rpm
Home made engine dynoWhy has every sprint scooter or moped not a straight part of pipe when it,s so good for low torque?
(torque is what you want by sprint races)And why will dpr never use a striaght part of pipe in his exhaust?
(this man has over 35years of experience)I think you’ve misinterpretated Arvid, it’s long to improve low-end torque, and it’s straight because that is cheaper to manufacture. I think the exhaust looks nice, an improvement might be a curl in the header to make it fit better under the moped? Something like the LeoVince handmade has.
I dont care if the exhaust is purple, how much more BHP did you gain! Thats the big question :pest
@Buxy, horsepower is what you want in sprint races, loads of torque is only neccessary when the clutch is slipping. Therefore a 1speed moped needs a flatter-wider spread torque curve than a sprint scooter.
I’m talking about low-end torque, this is the range of rpm a sprintscooter never uses except when it is ideling.
AW50-4t | 13.13 | Gianelli Citypower | 3.2Nm@6000rpm | 3.0pk@6700rpm
Home made engine dynoArvidW :
@Buxy, horsepower is what you want in sprint races, loads of torque is only neccessary when the clutch is slipping. Therefore a 1speed moped needs a flatter-wider spread torque curve than a sprint scooter.I’m talking about low-end torque, this is the range of rpm a sprintscooter never uses except when it is ideling.
I also say mopeds becourse a puch sprinter has also no straight part of pipe.
I have never seen a handmade pipe in my 3 years of sprint races that has a straight part in it.
And like I sayed DPR says also that every straight part gona cost hp.So yesterday we tested the exhaust and got 6,5 hp and 5,8 Nm with DR unported!! (Setup is written in this topic)
Diagrams will follow soon.
I tested this exhaust on the street and it is much better than the Proma CC, you will see this on different diagrams, too!It has got a very wide and high torque-curve, even much better than the Calibrata!
The exhaust is not too long, if we shorten the exhaust, you will just get your full performance at 10.000 r/pm. That’s too high.
With Proma you get it at 6.800 r/pm and with Calibrata at 8.490!Furthermore we got the full pwerformance about 2.000 r/pm, this is a very good result.
At 8.500 r/pm we got 2 hp more than with the Proma CC, so this exhaust will run very nice with variomatic, too.And even on a mono transmission the torque is much better than with the Calibrata and Proma.
I think the price will be round the 200 Euro, that’s totally okay for such a hnadmade exhaust, if you see the diagrams, you will be convinced about that and we worked many hours on this exhaust.
AND the part at the beginning is NOT straight, it is conical and made out of 2 parts!
More later this day.
Gruß, Fabian
is it possibel to put an other demper(or shorten the mount) on it, cause this loos huge(even bigger than the calibrata).
it would say, put the exhaust on a table, en take some closeup picktures so we can take a closer look at the shape. this thing looks kinda nice(but a bit big).
@hansieb, duss, jij gaat met deze pijp door grunn cruisen?:P
Mmmm I’m not interested in the pipe but i am in the 27mm flange.
I think 200 is way to much for an exhaust from which the performance are not that much better than a calibrata.
And like the most people say the exhaust is to long..
Is it possible that you sell seperate 27mm flanges?
Still I really appreciate the efford you put in to this project
If you would read what I wrot, you will see, that this is the PRORTOTYPE!!
The muffeler will be shorter, and the whole exhaust will be shorter!!
And by the way the performance is much better than the performance of the Calibrata and the Proma.Furthermore the perfromance holds on much longer, you will see that, if I post the diagrams. 😉
And 200 Euro, that’s 25 Euro more than the Calibrata and 15 more than the Fabrizi, that’s a very good price for a nex exhaust with better performance in which we put so much work and knowledge.
You will see that, if you get the diagrams.Gruß, Fabian
PS. Of course you can buy seperate 27mm flanges. 😉
Anoniemhow is the progress going ?
It was allot of work to do this video because there are so many diagrams.
This is the mono version of the exhaust which runs very very nice on vario, too!For example: The Proma CC has his peak performance of 5.9 hp at 55 km/h and falls down with his performance immediately.
The D.N. performance has his peak of 6.4 hp at 55 km/h, too. But the performance holds on, so that you got 2 hp more at your backtire at 65 km/h!!
Furtermore I am 8 km/h faster than before.I already bought an exhaust and I am really satisfied.
I even got much more torque in lower r/pms and at the top it is amazing how good it runs.You can order now, too. The exhaust in the video is the prototype and there will be optical and technical improvements, and the exhaust will be shorter with another muffler.
Gruß, Fabian
PS. The exhaust is made out of 1mm thick tin, so the exhaust is more silent and more qualititv, too.
The Proma is just made out of 0.5mm and Calibrata out of 0.6 mm.AND special wihes like 27mm flange are no problem.
The price will lay round 200 Euro inklusive shipping to G. That’s a very good price for a handmade and total new quality exhaust I think.
nice nice nice to see results
nice video too.looking goodmayby i want one for the upcoming summer;)
AnoniemThe exhaust runs nice;)
I’m interested too, but I’ts too expensive for me
Btw, did mofafreak change his colors?
I think orange/black was a better combination.Greetz,
Joris
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