New Dyno of 402LS2 534rwhp/494tq, but too lean?
11-01-2011, 09:06 AM
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New Dyno of 402LS2 534rwhp/494tq, but too lean? A new dyno dynosource speed labs opened nearby in Augusta, Ga and went to a group event to dyno Saturday, seeing as I had not dynoed in about 5 years. Not much changed from when Mike @ rapidmotorsports built the engine, *knock on wood* it is still running strong, goes to work about once a week, on cruises, shows, meetups, and occasional track duty.
Since the original dyno of 518/473 when the motor was first built, I have about 7k miles on it, have added a GZ motorsports belt-driven vacuum pump, and changed the plugs.
The car is street driven, somewhat conservative setup: still has non-true duals hooker headers exhaust, single cutout for the track/dyno, 1 3/4" qtp headers. It does have a 12 bolt with 3.73, denny's heavier driveshaft, textralia clutch, and a built trans. I left the airbox and filter on and the nitto-555 r drag radials with 29psi on the stock rims was left as is.
The dyno was on ethanol free 93 octane gas, with the single cutout open and the AF taken at the cutout.
Concerns:
Looks a little lean is the comments I've gotten, but wouldnt the fact that it was taken at the cutout tend to lean it out? Should I richen the tune up some? The car does not seem to knock and no knock or issues showed on the dyno, and I know 13:1 is ideal, but I've seen that some LSx's seem to prefer around 13.3-13.4. The car feels like it is really running well so I am afraid to mess with it.
Since the original dyno of 518/473 when the motor was first built, I have about 7k miles on it, have added a GZ motorsports belt-driven vacuum pump, and changed the plugs.
The car is street driven, somewhat conservative setup: still has non-true duals hooker headers exhaust, single cutout for the track/dyno, 1 3/4" qtp headers. It does have a 12 bolt with 3.73, denny's heavier driveshaft, textralia clutch, and a built trans. I left the airbox and filter on and the nitto-555 r drag radials with 29psi on the stock rims was left as is.
The dyno was on ethanol free 93 octane gas, with the single cutout open and the AF taken at the cutout.
Concerns:
Looks a little lean is the comments I've gotten, but wouldnt the fact that it was taken at the cutout tend to lean it out? Should I richen the tune up some? The car does not seem to knock and no knock or issues showed on the dyno, and I know 13:1 is ideal, but I've seen that some LSx's seem to prefer around 13.3-13.4. The car feels like it is really running well so I am afraid to mess with it.
