Paxton Superchargers Street - Manual (Page 4)

P/N: 008574 © 2008 Paxton Autom otive Corporation. Al l Righ ts Re s e rve d, Intl .
Copr. Se cure d (Stre e t Supe rch arge r Sys te m O w ne r’s M anual (008574V2.0))
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com pre s s ors or s upe rch arge rs .
M AF: (Mas s Air Fl ow Se ns or) An e l e ctric h ot w ire us e d
to m e as ure th e m as s or w e igh t of intak e air.
M AP: (Manifol d Abs ol ute Pre s s ure [or its s ignal
circuit]) Manifol d pre s s ure m e as ure d on th e
abs ol ute pre s s ure s cal e , an indication of e ngine
l oad. At s e a l e ve l , w ith th e e ngine off, MAP=100
k Pa (14.7 PSIG)
Natural l y As pirate d: An e ngine w ith out a
s upe rch arge r.
PCV: (Pos itive Crank cas e Ve ntil ation) Engine
crank cas e fum e s ducte d back to th e intak e
m anifol
d to re duce air pol l ution.
Pre s s ure Boos t: Th e diffe re nce in pre s s ure be tw e e n
barom e tric and intak e m anifol d abs ol ute pre s s ure
on a s upe rch arge d e ngine (re ad as gauge
pre s s ure ).
Pre s s ure Ab s ol ute : Th e s um of gauge pre s s ure and
atm os ph e ric pre s s ure . O ne s tandard atm os ph e re
= 29 .9 2 in. of m e rcury (H g) = 14.69 6 l
b/in (PSI).
Pre s s ure Ratio: Manifol d abs ol ute pre s s ure divide d
by s tandard barom e tric pre s s ure . Pre s s ure Ratio
= gauge pre s s ure + atm os ph e ric pre s s ure
divide d by th e abs ol
ute pre s s ure . Th e ve rtical
s cal e on a com pre s s or m ap and it indicate s th e
pre s s ure ris e acros s th e com pre s s or. It is s cal e d
th is w ay ins te ad of ps i be caus e th e inl e t
conditions are unk now n.
Pre s s ure Re gul ator: A s pring l oade d re l ie f val ve th at
re turns e xce s s fue l to th e tank to m aintain
s ys te m pre s s ure .
PSI: (Pound Pe r Sq uare Inch ) PSI can be a m e as ure of
air or fl uid pre s s ure .
SAE J1723: Th e onl y w ay to prope rl y e val uate th e
e fficie ncy of a ce ntrifugal s upe rch arge r. It
outl ine s th e proce dure s for te s ting and th e n
pre s e nting re s ul ts in accurate and us abl e
com pre s s or m aps . Se e
w w w .s ae .org/Prods e rv/s tds /J1723_19 9 508.h tm .
Spe e d Line s : O n a com pre s s or m ap, pre s s ure at any
give n s pe e d is re l ative l y th e s am e until th e inl e t
ch ok e s and th e pre s s ure fal l s off. Us ual l y, w h e n
th e pre s s ure fal l s off, th e e fficie ncy al s o fal l s off.
Stoich iom e tric: Th e corre ct ch e m ical m ixture of air
and fue l to yie l d com pl e te com bus tion.
Supe rch arge : Incre as e th e de ns ity of ch arge by
com pre s s ing it be fore it e nte rs th e com bus tion
ch am be r.
Surge : Com pre s s or s urge is a condition th at occurs w h e n
th e re is ins ufficie nt air fl ow to s upport a s pe cific
pre s s ure on th e com pre s s or outl e t s ide . It ofte n
occurs during ve h icl e de ce l e ration w h e n th e th rottl e
is cl os e d, but th e com pre s s or is s til l at h igh s pe e d. It
can occur at h igh RPM and s m al l th rottl e ope ning
conditions if th e com pre s s or h as be e n re fit to run
fas te r and it can be a ch ronic probl
e m if th e incorre ct
s upe rch arge r h as be e n s e l e cte d. It can caus e
catas troph ic s upe rch arge r fail ure . It h e ats th e
dis ch arge air, re duce s e ngine re s pons e and, if
prol
onge d, can h e at s oak th e s upe rch arge r. Mas s air
fl ow s e ns ors do not function w e l l during com pre s s or
s urge .
Surge Line : Th e l ow e s t fl ow for any s pe e d. It is audibl y
ide ntifie d by a cough ing or banging nois e and
ph ys ical
l y by a ve ry h igh te m pe rature . A vol um e of
air rus h e s out th e inl e t, onl y to be s uck e d back in
w h e n th e com pre s s or re cove rs . Th e te m pe rature
incre as e s e ve ry tim e th is occurs . For e xam pl
e , if a
Paxton NO VI 2000 s upe rch arge r is ins tal l e d on a 2.0
l ite r e ngine , th e s upe rch arge r w oul d ope rate in s urge
or th e l e ft s ide of th e com pre s s or m ap. Prope r
com pre s s or m atch ing to th e appl ication e l im inate s
th is probl e m .
TPS: (Th rottl e Pos ition Se ns or) Se ns or th at provide s th e
control m odul e w ith a variabl e vol tage th at
re pre s e nts th e pos ition of th e th rottl e . Th e TPS is
us ual l y l ocate d in th e th rottl e h ous ing.
Val ve O ve rl ap: Th e num be r of crank s h aft de gre e s
e xpre s s ing th e tim e w h e n both th e intak e and
e xh aus t val
ve s are ope n.
Vol ute : A s crol l or s nail s h ape h ous ing us e d to contain
th e im pe l l e r and diffus e r. Locate d at th e re ar of th e
s upe rch arge r unit w h e re th e air e nte rs th e
s upe rch arge r. Som e tim e s re fe rre d to as a s crol
l or
com pre s s or h ous ing.
Vorte x: Fre e fl ow ing inw ard s piral s uch as s e e n at th e
drain of a bath tub.