motor swap done.. working out many many bugs
09-22-2013, 06:38 PM
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motor swap done.. working out many many bugs did a motor swap in a 91 s10 5.3 v2 almost 600 lift and 232 236 i believe cam ported 85mm intake and tb. heads are ported like crazy 2.02 1/60 manley race flow valves. mahle power pack pistons 9.81 or so compression. ls6 pcv swap. current performance harness. 42lb injectors hp tuners lc1 wide band
aremotive intake fuel pump 8an feed line y'ed off to 6an for each rail aremotive adjustable regulator 6an return line. 58psi fuel pressure and never drops.
first thing im trying to figure out is iac counts and correct fueling and spark at idle. lc1 is staying pegged out at 21.5. when driving itll come down to 16-15 way to lean. iac counts at a idle are over 200.
im in speed density mode using the freetuninguide that everybody follows. iv tried adding fuel to ve table and the wide band dont change much. im using the hptuner scanner to data log everything. when i start it and let it idle on its own it will rev to 2k or so and slowly come back down as the iac is opening and closing itll drop to 200 and the spark will go down to 8 and 9 sometimes then back up to 28. spark jumps all over the place instead of one smooth line at idle. i can lock in spark and rpms will jump from 850-1000 idle is set at 950 at pcm and iac stays at 200 if i try to go below 127 truck will die
iv tried adding fuel to ve and it dosnt change my a/f best iv gotten a/f error is 18 percent lean.
at idle
a/f 21.5
spark 8-28
kpa 68-74
iac 200-310
af error 18-30 percent below 4k
tps 0 (.71 volts at sensor)
hoping to get a/f closer to normal before i take it to the track friday. hope to use this forum to get the ol truck finished up. will post log and tune soon.
aremotive intake fuel pump 8an feed line y'ed off to 6an for each rail aremotive adjustable regulator 6an return line. 58psi fuel pressure and never drops.
first thing im trying to figure out is iac counts and correct fueling and spark at idle. lc1 is staying pegged out at 21.5. when driving itll come down to 16-15 way to lean. iac counts at a idle are over 200.
im in speed density mode using the freetuninguide that everybody follows. iv tried adding fuel to ve table and the wide band dont change much. im using the hptuner scanner to data log everything. when i start it and let it idle on its own it will rev to 2k or so and slowly come back down as the iac is opening and closing itll drop to 200 and the spark will go down to 8 and 9 sometimes then back up to 28. spark jumps all over the place instead of one smooth line at idle. i can lock in spark and rpms will jump from 850-1000 idle is set at 950 at pcm and iac stays at 200 if i try to go below 127 truck will die
iv tried adding fuel to ve and it dosnt change my a/f best iv gotten a/f error is 18 percent lean.
at idle
a/f 21.5
spark 8-28
kpa 68-74
iac 200-310
af error 18-30 percent below 4k
tps 0 (.71 volts at sensor)
hoping to get a/f closer to normal before i take it to the track friday. hope to use this forum to get the ol truck finished up. will post log and tune soon.
09-23-2013, 02:44 PM
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Played with her some today. Got to thinking maybe the tune is to rich at a idle since big cams are less efficient then stock so I subtracted from the 4-1200 .60 .70 and .80 and still no change
09-25-2013, 12:16 AM
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finally got a tune. tune seems do great other then my wide bad is sitll pegging leak iv cheaking to make sure my exhaust valves were sealing along with the intakes. all sealing. no exhaust leaks that i can hear. had a o ring leaking and a pin hole in the back of the professional products i didnt find before. my a/fs are still reading 22.1 and 21.5 at idle when getting into the gas itll raise up to 15 and at wot pulls its 13. any suggestions on the vaccum leak???
