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#1
10-05-2022, 01:35 AM
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Street Demon 625 - tuning results with AFR monitor
Spent the day tuning the Street Demon 625 on my ‘68 Firebird. The engine is 8.9:1 CR with a Pertronix HEI distributor (18 deg. initial + 15 deg. manifold vacuum advance). Here’s what I got today:
> 60/52 METERING RODS > SILVER METERING ROD SPRINGS (8” VAC) > PRIMARY JET: 78 > SECONDARY JET: 80 > IDLE MIXTURE SCREWS 2 ⅛ TURNS OUT > IDLE VACUUM: 16” PARKED, 12.5” DRIVE > IDLE AFR: 13.8 PARKED, 13.5 DRIVE > IDLE RPM: 950 PARKED, 750 DRIVE > 13.6: AFR CRUISE > 13.3: AFR PART THROTTLE > 12.1: AFR HEAVY THROTTLE > 13.0: AFR W.O.T. I have one issue with the gas pedal, - I’m not getting full motion and not getting to WOT as a result. I need to solve that problem before I can focus on the WOT AFR. I’m also thinking about trying the 58/52 metering rods to see how it affects the cruise & part throttle AFR’s.
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Raffi R. 1968 Firebird: 350 .040 over, #11 Heads w/2.05/1.66 valves, Tomahawk TC-03 cam (214/221 flat tappet cam, 112 LSA, .0450/.0465 lift w/ 1.5 rockers), 200-4R w/3.55 gears, Street Demon 625 w/ Edelbrock Performer, H-Pipe dual exhaust w/Delta Flow 50's. |
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