Dart LS Next 427 Initial Timing
Dart LS Next 427 Initial Timing Just finished and installed my Dart LS Next 427 build and need help with base timing parameters. I have read and watched lots of tuning videos recommending an idle timing of ~24 degrees and all in at 31 degrees by 3500 rpm. Given the intake and heads I don't see a lot of reason to spin it past 6500 rpm. I am not intending to race, just cruise and show mostly, some burnouts of course. Any insights or recommendations are greatly appreciated.
Dart 31867211 block
Bore is is 4.125
Deck 9.24
DSS Pistons K1921-4125 +10CC volume
Eagle 6.125 I beam rods
Lunati Voodoo 4 inch stoke crank
BTR .051" head gaskets
BTR Stage 3 N/A CI+ camshaft 239/254 .631/.610 114+3
GMPP ported heads
FAST 102 LSXR intake
FAST 102 throttle body
FAST EZ LS 2.0 computer
Tremec T56
Car weight 3300 pounds
Dart 31867211 block
Bore is is 4.125
Deck 9.24
DSS Pistons K1921-4125 +10CC volume
Eagle 6.125 I beam rods
Lunati Voodoo 4 inch stoke crank
BTR .051" head gaskets
BTR Stage 3 N/A CI+ camshaft 239/254 .631/.610 114+3
GMPP ported heads
FAST 102 LSXR intake
FAST 102 throttle body
FAST EZ LS 2.0 computer
Tremec T56
Car weight 3300 pounds
Im all for diy, but please dont hurt this motor over basic tuning perameters. There are some really good remote tuners who will work with you and teach you along the way too.
Last edited by rkupon1; Nov 7, 2020 at 08:22 AM.
LS motors don't need timing like the old SBC motors. On my last one we did a lot of dyno runs stepping the timing up a degree at a time until we stopped making power. I don't have the tune in front of me, but we ended up around 25 degrees total max power. And it wasn't constant, meaning we dropped timing during some of the RPM range (around peak torque) and picked it back up again in upper RPM. That was our best curve.
I experimented a lot with my idle timing anywhere between 20 and 25 degrees. I ended up around 20-21, that was what the engine liked.
I know you are using a FAST ECU, but I highly suggest spending some time on the Holley support forums. There are some great writeups in the HP EFI and Dominator forums about tuning in general, specifically when it comes to idle tuning. You can learn a ton reading those which will also apply to your FAST.
Good luck.
I experimented a lot with my idle timing anywhere between 20 and 25 degrees. I ended up around 20-21, that was what the engine liked.
I know you are using a FAST ECU, but I highly suggest spending some time on the Holley support forums. There are some great writeups in the HP EFI and Dominator forums about tuning in general, specifically when it comes to idle tuning. You can learn a ton reading those which will also apply to your FAST.
Good luck.
Great suggestion on the Holley forum. Thanks. The FAST forum was out of date and appears to be taken down. The FAST EZ is unique in that you have a screen on the hand held to set the base and max timing. All the remainder of the timing table is hidden and filled in with the adaptive learning. I used a vacuum gauge to find the max vacuum (28 inches) at 900 rpm and them backed it down 4 degrees now.
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LS motors don't need timing like the old SBC motors. On my last one we did a lot of dyno runs stepping the timing up a degree at a time until we stopped making power. I don't have the tune in front of me, but we ended up around 25 degrees total max power. And it wasn't constant, meaning we dropped timing during some of the RPM range (around peak torque) and picked it back up again in upper RPM. That was our best curve.
I experimented a lot with my idle timing anywhere between 20 and 25 degrees. I ended up around 20-21, that was what the engine liked.
I know you are using a FAST ECU, but I highly suggest spending some time on the Holley support forums. There are some great writeups in the HP EFI and Dominator forums about tuning in general, specifically when it comes to idle tuning. You can learn a ton reading those which will also apply to your FAST.
Good luck.
I experimented a lot with my idle timing anywhere between 20 and 25 degrees. I ended up around 20-21, that was what the engine liked.
I know you are using a FAST ECU, but I highly suggest spending some time on the Holley support forums. There are some great writeups in the HP EFI and Dominator forums about tuning in general, specifically when it comes to idle tuning. You can learn a ton reading those which will also apply to your FAST.
Good luck.
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Verdad Gallardo Great suggestion on the Holley forum. Thanks. The FAST forum was out of date and appears to be taken down. The FAST EZ is unique in that you have a screen on the hand held to set the base and max timing. All the remainder of the timing table is hidden and filled in with the adaptive learning. I used a vacuum gauge to find the max vacuum (28 inches) at 900 rpm and them backed it down 4 degrees now.
I owned a FAST many years ago because any of the auto-learning systems were available. I wrote my own application to use log files to 'auto tune' my fuel timings which is similar to what the FAST EZ does I believe (and Holley as well now). It's not hard, just look at the correction factor on fuel vs. the target and adjust from there. Timing isn't so easy though.
Good luck.