User guide
Page 37.
ADDITIONAL NOTES
The 2.38” pulley when combined with our 14% overdrive damper will result in a supercharger speed
23,000 RPM at 6,500 RPM engine speed. Based on LPE testing we do not recommend exceeding
23,000 RPM on the LS9 supercharger.
The production GM LS9 fuel injectors and production fuel pump are able to supply the correct amount
of fuel for either pulley size so no changes to the injectors or the fuel system are needed if you are
only installing the Lingenfelter LS9 cover and supercharger pulley.
If you are using this pulley kit in combination with an overdrive damper and/or other engine
modications you may need larger injectors.
The production 2009-2013 ZR1 Corvette spark plugs are the same spark plugs used in the 2006-
2013 Z06 Corvettes and the 2009-2013 CTS-V. In engine dynamometer, chassis dynamometer and
track testing performed by LPE, we have found these spark plugs to be well suited to stock to highly
modied LS9, LS7 and LSA engines. Unless you are running top speed testing or endurance type
road racing applications or this is a marine engine application, LPE recommends retaining the stock
LSA spark plugs at the production gap of 0.040” (1 mm). If you do nd you need to go to a colder
range spark plug, the production 12571165 (AC Delco 41-104) iridium spark plugs are roughly the
same heat range as the Denso IT20 spark plugs and the NGK TR7ix spark plugs. The next stage in
colder plugs would be a Denso IT22 or an NGK TR8ix.