Blow-Off

Ce ati modificat la Saab-ul vostru sau ce ati vrea sa modificati

Blow-Off

Postby franktem » 30 Sep 2008, 21:30

Are cineva montat blow-off?

In afara efectului sonor ajuta cu ceva la eliberarea presiunii?


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Postby Edy » 01 Oct 2008, 12:20

Eu mi-am montat recent un BOV Forge. Inlocuieste supapa de recirculare Bosch cu care vine din fabrica si recomand sa fie cu recirculare. Cele atmosferice nu sunt recomandate ptr. Saab. Daca vrei neaparat si efectul sonor poti sa iei pe cel "Dual", adica si cu recirculare si atmosferic (adica asa cum am luat si eu)! Nu iti aduce cai in plus dar prelungeste viata turbinei care va lucra cu mult mai bine si va disparea efectul de "sarcina"!
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Postby franktem » 01 Oct 2008, 17:20

De unde yau? cat e? merge la mine la cutie automata?
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Postby raul » 12 Mar 2009, 17:05

Si eu vreau sa montez asa ceva la iubita mea 93
i love 93 Aero
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Postby cristian_93 » 22 Apr 2009, 09:08

Nu stie nimeni: merge si pentru cutiile automate??
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Postby franktem » 22 Apr 2009, 09:41

Merge.
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Postby cristian_93 » 22 Apr 2009, 09:43

Are si efect sonor sau doar functional?? Mersi!
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Postby franktem » 22 Apr 2009, 10:01

Elibereaza presiune din turbina mai repede, teoretic ii prelungeste viata, in realitate nu stiu, asta am aflat si eu.

La cutiile manuale e mai de efect la automate nu cred ca face vre-o diferenta.
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Postby john_doe_cj » 07 Jun 2009, 20:02

Saab ng 900 turbo are original pe masina varianta de fabrica a blow-off-ului adica turbo bypass .
Last edited by john_doe_cj on 07 Jun 2009, 20:18, edited 1 time in total.
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Postby john_doe_cj » 07 Jun 2009, 20:17

Am gasit ceva care explica foarte bine ce e cu blow-off-ul si cu alte sisteme de genul asta . Din pacate e in engleza si eu nu am momentan rabdarea necesara sa traduc dar ...... oricum
Anti-Surge/Dump/Blow Off Valves
Main article: Blowoff valve

Turbocharged engines operating at wide open throttle and high rpm require a large volume of air to flow between the turbo and the inlet of the engine. When the throttle is closed compressed air will flow to the throttle valve without an exit (i.e. the air has nowhere to go).

This causes a surge which can raise the pressure of the air to a level which can damage the engine. If the pressure rises high enough, a compressor stall will occur, where the stored pressurized air decompresses backwards across the impeller and out the inlet. The reverse flow back across the turbocharger causes the turbine shaft to reduce in speed quicker than it would naturally, possibly damaging the turbocharger. In order to prevent this from happening, a valve is fitted between the turbo and inlet which vents off the excess air pressure. These are known as an anti-surge, bypass, blow-off valve(BOV) or dump valve. It is basically a pressure relief valve, and is normally operated by the excess pressure in the intake manifold.

The primary use of this valve is to maintain the turbo spinning at a high speed. The air is usually recycled back into the turbo inlet but can also be vented to the atmosphere. Recycling back into the turbocharger inlet is required on an engine that uses a mass-airflow fuel injection system, because dumping the excessive air overboard downstream of the mass airflow sensor will cause an excessively rich fuel mixture. A dump valve will also shorten the time needed to re-spool the turbo after sudden engine deceleration.
Sper sa va ajute si asa........ Eu unul sunt hotarat sa-mi cumpar un blow-off dar momentan nu ma prea tine buzunarul la ce preturi am vazut la supapele respective .Oricum masina mea are turbo bypass asa ca .......atat ca nu are sunetul la un blow-off in rest isi face si asta treaba
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Re: Blow-Off

Postby adi_saba » 11 Mar 2010, 09:23

si-a montat cineva recent asa ceva? la ce pret?
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Re: Blow-Off

Postby Edy » 11 Mar 2010, 09:42

Acesta este un BOV Forge Hybrid cu 3 functii(atmosferic, recirculare si combinat). Pentru B205 si B235, Trionic 7 este obligatorie functia de recirculare; pentru T5 B204 se poate pune BOV normal-atmosferic iar B234 (fabricat pana in 1998) echipat cu BOV atmosferic...e de senzatie (se aude suieratul foarte puternic)
Pretul Forge Hybrid este in jurul a 800 de ron; un BOV normal atmosferic nu trece de 450 de ron
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Re: Blow-Off

Postby lucian » 11 Mar 2010, 13:06

NU puneti BOV pe motoare T7 (cutie de aprindere neagra)!!! O sa va stricati ceva prin motor si sigur o sa va alegeti, la cea mai mica accelerare, cu un CEL aprins (Code Error Light), ceea ce va insemna o vizita la un service cu TECH 2 ptr. stergerea erorii. Motoarele T7 au MAF (Mass Air Flow), care masoara cat aer intra in circuit. De aia T7 au valva cu recirculare (Bosch), aerul masurat la intrarea-n circuit sa ramana acelasi. Daca puneti Blow Off Valve, aerul iese din circuit si da cod de eroare...poate coxa pistoanele, etc.
pe T5 (cutie de aprindere rosie) merge, dar nu pe T7!
Ma rog, treaba voastra!
Ia mai tunati mai baieti! Haiiiii!
:)

P.S. Edy are un BOV hibrid (adica si atmosferic, si recirculare) si dupa o scurta experienta -neplacuta- setat pe atmosferic (adica BOV normal), a inteles si l-a trecut pe recirculare. Intrebati-l pe el...are T7.

Ma rog, pararea mea...
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Re: Blow-Off

Postby cristian_93 » 11 Mar 2010, 14:05

Motorul meu B207R e T5 sau T7?? E un 9-3 Aero model 2004, 210 cp, cutie automata. Merge pus un BOV pe acest motor? Si daca da, are vreun efect sonor/ practic?

Stiu ca am mai pus intrebarea, dar aveam nevoie de un raspuns mai complet :)
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Re: Blow-Off

Postby lucian » 11 Mar 2010, 14:17

cristian_93 wrote:Motorul meu B207R e T5 sau T7?? E un 9-3 Aero model 2004, 210 cp, cutie automata. Merge pus un BOV pe acest motor? Si daca da, are vreun efect sonor/ practic?

Stiu ca am mai pus intrebarea, dar aveam nevoie de un raspuns mai complet :)

B207 e un motor T8 :)
De ce vrei sa pui un BOV, de fapt?
Masinile automate nu pot fi tunate doar din hardware, gen intercooler si turbo mai mari....trebuie si soft-ul din ECU modificat, pentru ca altfel se duce draq cutia...ea stie sa schimbe la anumite turatii/forte/cuplu.
Daca dai mai mult cuplu din motor, cutia nu va sti ce sa faca cu el => ceva trozneste!
Doar pentru efect sonor, n-are rost...
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