Quote:
Originally Posted by Restroom
Wow, 51 lb-ft at the wheels from TM delete, it's not the hundred that had been claimed earlier (about which I had serious doubts) but it's still a hell of a lot of grunt that the computer is keeping away from you. HP is basically useless as far as I'm concerned, it's the mystery of where all that luscious torque a smallblock with all that reciprocating mass produces is going on the L99s. The driveline is only eating so much, and in a modern, well-designed vehicle it just doesn't add up that we'd lose that much purely mechanically.
There's still something weird about the new curves, though - the shape of the stock curves is about how you'd expect, (though peaky for such a low-revving V8) but the 'after' curve is totally different. In fact, it looks kinda like the results you'd expect from a mild (and possibly ill-planned) cam swap: the torque peaks earlier but runs out of steam thereafter, and now the power's dipping, too, after 4500. Let it be known that this is bald conjecture and I've never learned to read a dyno chart the way a tuner can, but for power and torque to not increase in a linear fashion over the whole power band seems like it can't be good... especially as the car's going to be shifting around six grand and looking for slip... ah, ignore me, I don't know enough to express what I'm trying to here. But maybe someone with a lot more experience at the dynamometer can help me out here?
Next question is what did they tweak, and how much did it cost?
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TM DELETE? You must have meant reduction..that is what we do.
There is a device on the L99 engine called a cam phaser,by controlling what the cam phaser is doing you can change the curve completely.LS3 DO NOT HAVE THIS UNFORTUNANTLY(Good and bad).
Also you will see that the factory tune has very little timing(why it is so jagged) as well as showing knock(huge dips) through out the run.
Any way,it is what it is,the customer loves it and I am pretty sure he will frequent the track a little more often now that his car is correct.
Hope this helped out!
Andy