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When I first installed it and got it into learning mode it acted the same as before. I had to modify the exhaust because the header was so short it was sucking back fresh air and confusing the O2 sensors. I ended up drilling the throttle body hole out as well (5/32"). I had the idle screw opened so far that I couldn't get it to idle correctly, even with the TPS sensor mounting holes slotted and rotated back. I also added an Advanced Adapters VSS input to the computer which keeps the idle up when it sees a speed. After that it was completely tunable. I raised the idle to 800 rpms and played with timing and fuel mixture while she was driving to get it as close as I could. It still stalls occasionally if you go from heavy throttle to heavy brakes but I can live with that. May happen two or three time in a day of wheeling. I'm sure that the Jim's setup would have been fine with a decent dyno tune but I gave up on that due to my location. If anyone needs a Jim's computer and harness for a LS1.... Heres a before and after of the exhaust. I cut the tips off the mufflers and welded on v-band clamps. I bought some stainless 2.5" 90* elbows and I coped and welded them together leaving the center open like an x-pipe. This added 24" of exhaust length to each bank but only sticking out 2" farther than before the mod. Before this the O2 sensor would jump from 11:1 all the way to 16:1 with no consistency. Now it's set at 13.8:1 and never gets out of the 13s.
When I first installed it and got it into learning mode it acted the same as before. I had to modify the exhaust because the header was so short it was sucking back fresh air and confusing the O2 sensors. I ended up drilling the throttle body hole out as well (5/32"). I had the idle screw opened so far that I couldn't get it to idle correctly, even with the TPS sensor mounting holes slotted and rotated back. I also added an Advanced Adapters VSS input to the computer which keeps the idle up when it sees a speed. After that it was completely tunable. I raised the idle to 800 rpms and played with timing and fuel mixture while she was driving to get it as close as I could. It still stalls occasionally if you go from heavy throttle to heavy brakes but I can live with that. May happen two or three time in a day of wheeling. I'm sure that the Jim's setup would have been fine with a decent dyno tune but I gave up on that due to my location.
If anyone needs a Jim's computer and harness for a LS1....
Heres a before and after of the exhaust. I cut the tips off the mufflers and welded on v-band clamps. I bought some stainless 2.5" 90* elbows and I coped and welded them together leaving the center open like an x-pipe. This added 24" of exhaust length to each bank but only sticking out 2" farther than before the mod. Before this the O2 sensor would jump from 11:1 all the way to 16:1 with no consistency. Now it's set at 13.8:1 and never gets out of the 13s.
