Paxton Superchargers Street - Manual (Page 3)

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 (008574V4.0))
QUESTIONS?
Paxton Autom otive Corporation • 1300 Be acon Pl ace , O xnard, CA 9 3033-9 9 01
Te l : 805-487-379 6 • Fax: 805-247-0669 • paxtonauto.com • 8:00 AM -4:30PM M -F (PST)
GLOSSARY
Afte rcool e r: A h e at e xch ange r w h ich re duce s th e
te m pe rature of th e com pre s s e d ch arge be fore it
e nte rs th e com bus tion ch am be r.
Air By-Pas s Val ve : D e vice de s igne d to e l im inate
com pre s s or s urge . It functions by al l ow ing air to be
dum pe d (or route d back to th e s upe rch arge r inl e t
on MAF e ngine s ) from th e dis ch arge s ide of th e
s upe rch arge r. It e m pl
oys pre s s ure s e ns or l ine s th at
ope rate an inte rnal diaph ragm conne cte d to a
val ve . Th is is an e s s e ntial pe rform ance im proving
de vice th at al s o im prove s durabil ity.
Air Fue l Ratio: Th e am ount of air com pare d to th e
am ount of fue l in th e air fue l ratio m ixture , al m os t
al w ays e xpre s s e d in te rm s of m as s (s e e
s toich iom e tric). Ide al air fue l ratio at idl e and l ow
e ngine l oad is 14.7:1 (s e e Fue l rich /l e an).
Am b ie nt Te m pe rature : Th e curre nt te m pe rature of
th e s urrounding outs ide air.
Atm os ph e ric Pre s s ure : Norm al pre s s ure in th e
s urrounding atm os ph e re , ge ne rate d by th e w e igh t
of th e air above us pre s s ing dow n. At s e a l
e ve l , in
ave rage w e ath e r conditions , atm os ph e ric pre s s ure
is approxim ate l
y 100 k Pa (about 14.5 ps i) above
vacuum or ze ro abs ol ute pre s s ure .
Barom e tric Pre s s ure : Anoth e r te rm for atm os ph e ric
pre s s ure . Expre s s e d in inch e s of Me rcury (in.H g.).
H ow h igh atm os ph e ric pre s s ure (re l
ative to ze ro
abs ol ute pre s s ure ) force s Me rcury up a gl as s tube .
14.5 ps i= 29 .9 2 in.H g.
Bl ow e r: Te rm ofte n appl ie d to al l type s of
s upe rch arge rs .
Boos t: Condition of ove r pre s s ure (above atm os ph e ric
in th e intak e m anifol d) caus e d by intak e air be ing
force d in by a s upe rch arge r.
BTM : (Boos t Tim ing Mas te r) D rive r com partm e nt
adjus tm e nt for re tarding ignition tim ing. Incl ude d
w ith s om e s upe rch arge r k its to control ignition
tim ing to pre ve nt de tonation. A boos t/ vacuum
re fe re nce d ignition tim ing control
.
Ch ok e Line : Are a on com pre s s or m ap w h e re th e
com pre s s or can no l onge r e fficie ntl y de l ive r th e
am ount of airfl ow th e e ngine ne e ds . It is th e point
w h e re boos t pre s s ure fal l s off on a com pre s s or
m ap, e ve n th ough air fl ow continue s to incre as e .
Can be caus e d by re ach ing th e capacity of th e
im pe l
l e r, th e capacity of th e com pre s s or h ous ing
pas s age w ay, or th e inl e t. 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 .
Com pre s s ion Ratio: Th e ratio of m axim um e ngine
cyl inde r vol um e (w h e n th e pis ton is at th e bottom
of its s trok e ) to m inim um e ngine cyl inde r vol um e
(w ith th e pis ton at TD C). Th us , th e th e ore tical
am ount th at th e air to fue l m ixture is com pre s s e d in
th e cyl inde r.
Com pre s s or H ous ing: Th e h ous ing w h ich m ak e s up th e
e ncl os ure portion of th e com pre s s or. Al s o re fe rre d to
as th e vol ute , s crol l or s nail .
Com pre s s or M aps : Graph ic s um m arie s of s upe rch arge r
pe rform ance data (w ith re s pe ct to pre s s ure and
fl
ow ) ge ne rate d us ing te s t e q uipm e nt and
proce dure s .
D e ns ity: Th e ratio of th e m as s of s om e th ing to th e
vol um e it occupie s . Air h as l e s s de ns ity w h e n it is
w arm , and l e s s de ns ity at h igh e r al titude s .
D e tonation: (Knock ) Sudde n incre as e in cyl inde r
pre s s ure caus e d by pre -ignition of s om e of th e air-
fue l
m ixture as th e fl am e front m ove s from th e
s park -pl ug ignition point. Pre s s ure w ave s in th e
com bus tion ch am be r cras h into th e pis ton or
cyl
inde r w al l s . Th is re s ul ts in th e s ounds k now n as
k nock or ping. Strongl y infl ue nce d by fue l octane
rating, ignition tim ing, and com pre s s ion ratio as w e l l
as boos t l e ve l . May be caus e d by h ot carbon
de pos its on th e pis ton or cyl inde r h e ad.
EFI: (El e ctronic Fue l Inje ction) A com pute r control l e d fue l
s ys te m th at dis tribute s fue l th rough an inje ctor
l ocate d in e ach intak e port of th e e ngine . Th e fue l
inje ctors are us ual l y fire d us ing individual circuitry.
Efficie ncy Is l ands : Th e pe rce ntage val ue s th at
de s ignate th e e fficie ncy e xpre s s e d in an is l and
re pre s e ntation on a com pre s s or m ap. Th e are a
ins ide th e is l
ands de s ignate m axim um e fficie ncy,
th e are a to th e l e ft of th e e fficie ncy is l ands
de s ignate th e te m pe rature is too h igh on th e s urge
s ide , and th e are a to th e righ t of th e e fficie ncy
is l
ands de s ignate th at drive h ors e pow e r is h igh on
th e ch ok e s ide .
Fue l Rich /Le an: An e val uation of air to fue l ratio bas e d
on an air-fue l val ue k now n as s toich iom e tric or
14.7:1. In m os t fue l inje ction s ys te m s rich /l e an is
de te rm ine d by vol tage s ignal from th e oxyge n
s e ns or. An e xce s s of oxyge n l e an is a vol tage of l e s s
th an .4 vol ts . A rich condition is indicate d by a
vol tage of gre ate r th an .6 vol ts .
FM U: (Fue l Manage m e nt Unit) A vacuum /boos t
re fe re nce d fue l pre s s ure re gul ator. Us e d to incre as e
th e pre s s ure by re gul ating fue l fl ow re turning to th e
tank from th e s tock fue l pre s s ure re gul ator.
Im pe l l e r: Th e finne d or bl ade d rotating w h e e l h ous e d
ins ide th e com pre s s or h ous ing.
Induce r: Th e air inl e t portion of a ce ntrifugal com pre s s or.
Inte rcool e r: A h e at e xch ange r w h ich re duce s th e
te m pe rature of th e ch arge air be tw e e n s tage s of