rada

[MIRIS]

bracha ma 100nx 2.0gti,a chtel by nak predelat vifuk,koupil plnopruchozi koncak,a me by zajimalo co se stane kdyz da trupku prumeru 63mm od svodu az dozadu bez tlumicu,bude to mit naky spatny vliv na vikon?

[Vita.z31]

bracha ma 100nx 2.0gti,a chtel by nak predelat vifuk,koupil plnopruchozi koncak,a me by zajimalo co se stane kdyz da trupku prumeru 63mm od svodu az dozadu bez tlumicu,bude to mit naky spatny vliv na vikon?

Jo bude, v nizkej otackach se ztrati kroutici moment a posune se do hodne vysokejch ot(atmo potrebuje protitalak pro spravne plneni motoru, ten poskytuji tlumice, u preplnovanych motoru to obstarava turbina)auto se stane nevykonym a nenazranym. U atmosfer je lepsi drzet se ozkousenejch metod. Tj, neco odlazeneho na dany typ auta. Zkus supersprint mam ho na saxu a maximalni spokojenost

[kenivruh]

Nebude http://www.sportcompactcarweb.com/tech/ ... to_06.html

[Vita.z31]

Nebude http://www.sportcompactcarweb.com/tech/ ... to_06.html

Tohle je info k tomu odkazu. Kdyz das trubku tak rozhodne nedosahnes zvyseni vykonu, ale naopak.

Race exhaust
Thanks in no small part to our Mad Max-style cage, our car is a little porky. We ran the first race with a stock midpipe and a cobbled-together muffler section, which didn't do much for power. The solution is cheap, simple, and loud. Inspired by the 3-inch JG Edelbrock B-pipe, also known as a dump pipe, which made huge horsepower and torque gains on our Project Civic, we headed to Hotshot, which fabricated the car's previous header system.

Andris Lavins hacked an old B-pipe assembly, welding the two secondary pipes into a single 3-inch section. We guessed on the length, about 3 feet, and gained 6 hp and 4 lb-ft of torque, made more horsepower and torque throughout the rev range and saved 25 pounds over the old system. However, earplugs are now a must.

With 145 wheel hp and 2,200 pounds, we're safely with the 15:1 ratio, and even could stand to lose a few pounds.

[jsadik]

Hlavně bude mít větší spotřebu.

[kenivruh]

Nebude http://www.sportcompactcarweb.com/tech/ ... to_06.html

Tohle je info k tomu odkazu. Kdyz das trubku tak rozhodne nedosahnes zvyseni vykonu, ale naopak.

Race exhaust
Thanks in no small part to our Mad Max-style cage, our car is a little porky. We ran the first race with a stock midpipe and a cobbled-together muffler section, which didn't do much for power. The solution is cheap, simple, and loud. Inspired by the 3-inch JG Edelbrock B-pipe, also known as a dump pipe, which made huge horsepower and torque gains on our Project Civic, we headed to Hotshot, which fabricated the car's previous header system.

Andris Lavins hacked an old B-pipe assembly, welding the two secondary pipes into a single 3-inch section. We guessed on the length, about 3 feet, and gained 6 hp and 4 lb-ft of torque, made more horsepower and torque throughout the rev range and saved 25 pounds over the old system. However, earplugs are now a must.

With 145 wheel hp and 2,200 pounds, we're safely with the 15:1 ratio, and even could stand to lose a few pounds.

Ok. Kde sa tam pise o znizeni vykonu?

[kenivruh]

Popis k tomu obrazku:

So you need backpressure to make torque, eh? Isn't it about time that myth died? Lopping off the exhaust and replacing it with a 3-inch diameter, 3-foot long pipe made power everywhere. And noise. Everywhere.

Neviem kde tam pisu o nizsom vykone.

[MIRIS]

tak to mi je uz asi jasne

[raddy]

protitlak, alebo inak povedane restrikcie v sani ci vyfuku maju protichodnu funkciu:
na jednej strane restrikcia sposobi zvysenie rychlosti prudenia plynov, co je pozitivum pre zlepsenie plnenie a vyplachu v nizkych otackach, preto su restrikcie (protitlak) dolezite pre priaznivy priebeh krutiaceho momentu v nizkych otackach.

na druhej strane od urcitych otacok motora protitlak sposobi postupne znizovanie ucinnosti plnenia a vyplachu a tym znizovanie produkovaneho krutiaceho momentu motora.

protitlaky su ziaduce pri nizkych otackach, neziaduce pri vyssich. to je dovod systemov ako VTEC ci 8 portovej hlavy v japonskom ca18det. V nizkych otackach su protitlaky umelo zvysovane (uzsi profil vacky vo VTEC ci otvorenie len 4 portov v sani a pod) a vo vyssich otackach su protitlaky znizovane (prepnutim VTEC na sirsi profil vacky alebo otvorenie vsetkych 8 portov a pod).

Netreba zabudat ze motor ma urcite vyuzitie a to nie je vacsinou sprint na 400m ale normalna prevadzka kde sa rozbiehas aj inak ako pri 5000ot.
Na zachovanie prijatelneho priebehu krutiaceho momentu voci otackam je protitlak velmi dolezity a jeho miera urcuje krivku priebehu krutiaceho momentu motora. Z toho vyplyva ze znizenim protitlakov sa zvysi max. krut. moment motora ale zaroven bude negativne ovplivneny jeho priebeh.

[raddy]

Nebude http://www.sportcompactcarweb.com/tech/ ... to_06.html

neviem ci je tento priklad idealny pre priklad vyfuku, nakolko su pouzite ine vacky a ECU, co moze uplne zmenit charakteristiku o ktoru nam ide. zober motor a jedine co urobis bude vymena vyfuku za komplet priechodzi. Potom zmeraj priebeh vykonu.

[kenivruh]

Jasne ze ma aj ine upravy, ale ide o to ze nestratil krutak ani v nizkych otackach. Len pre upresneni, oni tam nemaju ani tak vyfuk ako skor, len zvody a od nich tu B-pipe dlhu asi 1 meter, ktora konci asi niekde pod autom