Fuel Pressure psi/ Timing
10-13-2010, 06:52 PM
#1
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Car: 86 Transam / 80 Transam
Engine: 86/355 lo5 80/68' GTO 400
Transmission: 86/700R4 80/TH400
Axle/Gears: 86/3.42
Fuel Pressure psi/ Timing
Got a bypass fuel pressure regulator. on my new Lo5 350, .30 over with 86" l98 aluminium heads, a zz4 roller cam/ 1.6 rockers and edlebrock performer intake w/ 750 Edlebrock carb manual choke and serp setup. Just wondering if anyones had this setup and whats a good psi for the fuel pressure reg. and what to set the carb idle screws at right now there at 1 1/2 turns out for initial start up and also whats good for the timing with a 65K HEI dizzy. I've had it started but I had the wrong fuel pressure regulator and it was running to rich and fouled my plugs out and basically just ran like ***.
10-13-2010, 07:06 PM
#3
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Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Fuel Pressure psi/ Timing
Carbs won't reliably take much more than 6.5 PSI or so.
Set the timing for a fully-advanced 34-36 degrees at 2500 RPM or so, and as much vacuum advance as it'll take as soon as it'll take it without pinging under part-throttle acceleration.
Tune the idle mixture just lean of where you have maximum vacuum at idle speed.
Set the timing for a fully-advanced 34-36 degrees at 2500 RPM or so, and as much vacuum advance as it'll take as soon as it'll take it without pinging under part-throttle acceleration.
Tune the idle mixture just lean of where you have maximum vacuum at idle speed.
10-13-2010, 11:14 PM
#4
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Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Fuel Pressure psi/ Timing
Edelbrocks like even less pressure - more like 5psi maybe 6psi max.
10-14-2010, 06:26 PM
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Car: 89 K3500 Fleetside
Engine: RAT *tbi* EBL
Transmission: TH400
Axle/Gears: 3.73-Dana 60
Re: Fuel Pressure psi/ Timing
That is very true, esp. under heavy/any direction g-force,
AFB is not an easy bowl to manage.
AFB is not an easy bowl to manage.
Last edited by xch3no2; 10-14-2010 at 06:29 PM.
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