Originally Posted by CWiseman
And your betting Steve's has a cheater cam in it? It's comments like these that give people the false illusion that the LT doesn't have excellent (or better) numbers than the LS. I too have fallen into believing this folklore until only after I bought Steve's car and started looking at the dyno graph. Then I started remembering some other data that I pulled up which surprised me.
I'll start way back from the beginning as my car was the test bed for restricting the LS down at the start of CMC2 running against two LT1's. I was the one who showed it could be restricted down even further without any issues. Al Fernandez then took my LS dyno and chart plotted it against LT1's at Eagles Canyon in his motor home and showed they were virtually identical throughout the entire rpm range.
I have also seen the data used to allow the 5.3 which took three cars to the dyno on the same day to compare a 5.7 LS, 5.3 LS, and 5.7 LT1. There was generally less than a 1% difference between all three all the way across the dyno run and guess which one had the best HP and tq along with the best avg hp and tq from 3,000-5,700????
The LT1 yes T as in Tom as it did 259.82/307.03. The only place the LS had better torque was from 2,300 -3,000 rpm which isn't really use able but oh do we hear how the LT peaks so low. Then again at 5,100 the LS started having a 1 hp and tq advantage which was still only a 3 hp/2 tq advantage at 5,600. But keep in mind the LT had areas under the curve where it was beating them by 3-5 on both hp and tq yet all we hear is how the LT dies at 5,000. I just wonder how many of them have driven a restricted LS?
From 3,000 - 5,700 the LT averaged 241.87/296.24 to 239.74/292.76 for the LS.
So the next time someone says the LT doesn't have good numbers please refer them to this data. There are other LT cars out there with good numbers as well.
Now I'm very curious if anyone has put on the Torquehead ignition system on an LT1 as it wouldn't surprise me if the better ignition system doesn't help the numbers above 5,500. Still keeping in mind it's only a few better but doesn't make up for the better numbers the LT puts down between 3,000-5,500 as the LS falls on it's face in restricted form above 5,500 as well.
And everyone knows races aren't won and lost based on a couple of hp/tq differences.
The LT1 is Dead, Long Live the LT1. (the reason the LT is being replaced is the problems with it not running perfect all the time due to the opti which some have figured out how to seal it off from moisture or now you can add the Torquehead system. Plus the fact that if you blow up a LS for $750 at any salvage yard in America you have a complete engine. Much different than the $4,000 spent on the LT1 I now own)
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