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White Diamond 2001 STS
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1,317 Posts
The extra 25 horsepower comes from additional lift and duration on the intake camshaft, and the necessary fuel mapping programming differences to accompany it. That's it. All other equipment on the engine is exactly the same. Early Northstars (like 1993-1995 engines) had stiffer valve springs on the Touring models, but starting in 1996-1997, all Northstars were equipped with the stiffer springs, so that difference went away.

Increased performance is due to the extra horsepower and the shorter gearing (the Touring models have 3.71:1 final gearing and the "base" models have 3.11:1 final gearing).
 

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White Diamond 2001 STS
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1,317 Posts
Well, the question was where does the HP come from. That comes from the camshaft differences and the necessary programming. Assuming he may have also been asking why the Touring models are faster, I wanted to mention the differences in gearing, because they all play a part in the final outcome. ;)
 

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I'm a Cadillac Fanatic!
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9,575 Posts
Since this is such a popular topic, would someone care to write up a small article for me to post up on the site? It doesn't need to be just one person, either.. I'd just like something set for easy reference.. Maybe even for a "most frequently asked questions" forum...
 

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1997 Polo Green Cadillac Seville STS
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685 Posts
Huh?.... Then WHY did GM give the SLS's a different Engine VIN as opposed to the STS??? If the engines are completely alike...? That makes no sense what so ever......
 

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01 Eldo ETC, 02 Deville SOLD!
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1,815 Posts
But that's just it - they're not exactly alike - different cams, different PCM, different transmission gearing.
 

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1997 Polo Green Cadillac Seville STS
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685 Posts
But that's just it - they're not exactly alike - different cams, different PCM, different transmission gearing.
Ahh ok Different cams.. I can see why they would give it a different number based on JUST the cams...
 

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'87 Jeep, '10 Thruxton, '00 Duc 748, '01 748R (853cc)
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3,703 Posts
Haha...I just noticed it myself....3 YEARS!!! Damn, I think that's gotta be a record or something. I've seen 1 or even 2 years around here but 3...:helpless:
 

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1996 Eldorado Sport Coupe, 2009 Black Navigator
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5,032 Posts
Its still cool, it might temp other members to check out the archives for more informative info.
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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7,085 Posts
Katshot? Is that you? It's been so long I didn't even know you were on this board LOL. Hows my baby?
 

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94 ETC,97 STS
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3,531 Posts
This question has been asked...on fresh threads... that I'm amazed it popped up in a 3yr old one.:horse: :horse:
 
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