Patman
Staff member
I finally decided to get my car dyno tuned to improve on it's performance, and we found an extra 11rwhp from it, and most importantly, we flattened the torque curve big time, and were able to add more than 30ft lbs of torque to the midrange!! It's like a new car now! It'll easily run two tenths quicker in the quarter mile now.
We tracked down an intake elbow leak too, which caused the engine to run too lean, at 14:1. This is why my car always ran so strongly before, because it was so lean. Initially my car made 254rwhp with a catback being it's only mod. A typical LT1 automatic like that should only make about 235 to 240rwhp. So once we solved that problem we could then tune it properly and get the horsepower and torque curves nice and flat and got the a/f ratio to 12.5 to 1 in the end and got 265rwhp. They suspect I need new plugs, and that could also help give me another pony or two.
It's amazing how much power is lost in the stock programming on a high performance V8 like this. Initially it was running as much as 38 degrees total timing, but he bumped it down to 30, so it'll live nicely on 91 octane and will not get any knock retard on hot days.
It's too bad it won't be until the fall before I see cold enough temps to improve upon my best ET though. I might be able to match my 13.68/100.4 in the heat, but probably won't beat it. I fully expect to run 13.45 to 13.49 this fall, if not better. Not bad for an LT1 with 102k on it!
And as an added bonus, without the air leak, my silicon in oil analysis should be much lower, making my wear numbers even better than they already were!
We tracked down an intake elbow leak too, which caused the engine to run too lean, at 14:1. This is why my car always ran so strongly before, because it was so lean. Initially my car made 254rwhp with a catback being it's only mod. A typical LT1 automatic like that should only make about 235 to 240rwhp. So once we solved that problem we could then tune it properly and get the horsepower and torque curves nice and flat and got the a/f ratio to 12.5 to 1 in the end and got 265rwhp. They suspect I need new plugs, and that could also help give me another pony or two.
It's amazing how much power is lost in the stock programming on a high performance V8 like this. Initially it was running as much as 38 degrees total timing, but he bumped it down to 30, so it'll live nicely on 91 octane and will not get any knock retard on hot days.
It's too bad it won't be until the fall before I see cold enough temps to improve upon my best ET though. I might be able to match my 13.68/100.4 in the heat, but probably won't beat it. I fully expect to run 13.45 to 13.49 this fall, if not better. Not bad for an LT1 with 102k on it!
And as an added bonus, without the air leak, my silicon in oil analysis should be much lower, making my wear numbers even better than they already were!
