Audi Q7 361 - Audi Q7 Exhaust System; 4.2 l V8 FSI Exhaust Configuration; 3.0 l V6 TDI Exhaust Configuration

Exhaust system
4.2l V8 FSI engine
T h e complete e x haust s y stem fr om th e cylinder h e ads t o the tailpipes is d e signed a s a dual-br a nc h syste m .
Ai r g a p i n su la ted m a n i f o lds in the c l a mp f l ang e tec h niq u e a r e bolted ont o the cylind er h e ads. T h ese optimize
f l ow c h ar acter i stics, ensur i ng q u ic k heating of the c a talytic co nver ters.
T h e metal o x idation c a talytic co nver ters r e ac h o p er ating temperatur e very q u ic kly thanks t o their design and
pr o x i m ity t o the eng i n e . T h e br o a dband and tr ansi ti on La mbda pr o b es ar e lo c a ted u p str ea m and d o wnstr ea m
of the primar y c a talytic conver ters r e spectively .
T h e tw o cer a mic c a talytic conver ters ar e lo c a ted near the u n der b ody .
T h e fr ont silence r is a sha r ed component. It is de sign e d a s an abso rptio n - t ype sil e nc e r an d f e atu r es
a
" p r e ssur e eq ualizer" between the tw o e x haust br anc h es, which ha s a positive impact on engine power
ou tput a nd t o rq ue.
T h e abso r p tio n - t ype fr o n t silen c er i s al so a shar e d co mpon ent. H o wever , it co ntai ns an i n ter n a l par t i t i o n f o r
the e x h a u s t br anc h es.
A i r - gap in sula t e d ma ni f o ld in cla mp
fl a n ge te c hn iq u e
C e r a mi c pri m ar y c a ta l y t ic co nv ert e r
D e co upl i n g e lemen t
C e r a mic ma in c a ta ly ti c con v erter
Abs o rptio n r e ar si lencer with inner
p a rtit ion
A b s o rp tio n fr on t si len c er w i t h
"pr
e ss ur e eq ualiz er"
3.0 l V6 TDI engine
36 1_124
With this engine, the e x hau s t system do wnstr e am o f th e turboc ha r g er is design ed a s a sing e-br a n c h system.
Ca st manif o lds ar e bolted t o the c y linder heads, which r ou t e the e x h a u s t ga s int o the co mmon tu rboc har g er .
A metal c a talytic conver ter is f i tted do wnstr e am o f the turboc ha r g er . T h e ma in tenance-fr ee diesel pa r t ic ulate
f i lter is loc a ted in th e underbody ar ea. T h e r e ar silencer is desig n ed a s a r e f l ection sile ncer .
Met a l cat a lyt ic
co nv ert e r
Die s el p a r t i c u la te f i lt e r
Refl ect i on si len c er
361 _ 095
43