The Motor is a rebuilt 1995 Camaro Z28 LT1 383 M6 with the following parts
Scat Forged Crank
Scat ICR 6000 rods with ARP 2000-14 bolts
Keith Blackj ICON 718 2618 Forged +0.030 Piston 1.130 Comp Height
TOTAL SEAL Gapless Top Ring Set
Cometic Head Gaskets 0.045 thick
AFR #1101 210cc LT4 Competition Assy
#8019 PAC Racing Spring 1.270 OD Hyd Valve Spring 155lb .650 Lift
Lloyd Elliott Hi lift emission cam 223/231 .610 .594
Comp Cams Ultra Pro Magnum XD Roller Rockers
GM LS7 Lifters
GM Performance LT1/LT4 Timing Chain Set
Edelbrock LT4 Manifold - 7109 Air Gap LT4
MSD LT1 Optispark Pro Billet Distributor
JEGS Red Hot 8.0mm Plug Leads
ATI Balancer
42lb @ 3 Bar Modified Bosch Blue Demon 3 Fuel Injectors
LT4 Knock Module
SLP Air Foil
Moroso CAI
MAC Midlength Headers
Pre Cat Electric Cut Out
3" Stainless exhaust
!AIR - !EGR - !Cags
Throttle Body Bypass
Proform 141-130 Polished Center Bolt Die-Cast Valve Covers
Innovate LC-2 Wideband
Fidanza Aluminum Flywheel
KUPP Stage 4 Clutch Kit
T56 Short throw Billet Shifter
Lowered with Strano Springs & Koni 4/4 Shocks
Hawk Pads - Stainless Hoses
Tuning Software:
Datamaster
TunerPro
EEHack
Scan9495
The motor runs pretty well but i've been suffering with split BLM's and a persistant knock issue appearing around idle/off idle and low cruise.
All the usual BLM split causes have been checked & double checked without any issue being found & corrected really making much difference.
O2's replaced & swapped. Throttle blades adjusted, bypass checked & drilled. Manifold idle bleeds drilled out. EGR block offs replaced/resealed. Injectors replaced & swapped twice.
I usually hang out on LS1LT1 and have been here for a couple of months now.
I've just added the wideband and logged the latest .bin from a cold start.
The Idle was really stable & smooth (best it's been) until it hit closed loop around 60C then became much rougher & unstable like I'm used to.
The idle was stable around target by 25 RPM & went to 50-100 RPM around target which is normal.
The AFR was running from 12 upto 13.5 when it went closed loop.
Closed Loop AFR went to around 16-17 not anywhere near 14.7 as I expected.
BLM's & ST's are stable
O2 swing voltage I've read is 450mV for stoich but stock PCM has them set around 424 currently set around 428.
Stoich AFR is set to 14.7
I've altered all the usual Int delays and the readings are fairly stable, just not matching the Wideband.
Any suggestions on how to correct this without going Open loop idle ?
Has anybody got Injector voltage/offsets for the Bosch 3 Injectors ?
Thanks
Mitch
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