: So Where Does the Extra 25hp Come From?? (Touring Models)

Chuck C
03-07-03, 01:33 AM

03-07-03, 02:03 AM
more aggressive cam

03-07-03, 08:47 AM
Cam profiles, engine tuning, and gearing are the main differences between the two models.

03-07-03, 02:11 PM
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).

03-07-03, 03:06 PM
I'm NOT saying a word Jason :canttalk:

03-07-03, 03:17 PM
'Bout what sir?

03-07-03, 07:27 PM
'Bout how the "performance" is REALLY from the gearing and not the slightly higher HP rating.
I didn't want to start up that last "discussion" we had again ;)

03-07-03, 09:22 PM
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. ;)

Chuck C
03-08-03, 01:27 AM
thanks to all for the great answers!

03-09-03, 01:44 AM
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...

12-02-06, 12:06 PM
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......

12-02-06, 12:50 PM
But that's just it - they're not exactly alike - different cams, different PCM, different transmission gearing.

12-02-06, 01:03 PM
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...

12-02-06, 03:28 PM
Holy resurrection!

12-02-06, 04:04 PM
Holy resurrection!

Yes Robin, .... to the Batcave!!

12-02-06, 05:19 PM
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:

12-02-06, 10:35 PM
Its still cool, it might temp other members to check out the archives for more informative info.

12-02-06, 10:39 PM
Not just 3, but 3.5 years! Holy fishpaste!

12-03-06, 11:44 AM
Katshot? Is that you? It's been so long I didn't even know you were on this board LOL. Hows my baby?

12-03-06, 12:55 PM
This question has been asked...on fresh threads... that I'm amazed it popped up in a 3yr old one.:horse: :horse:

12-05-06, 09:14 AM
"He who asks a question is a fool for five minutes; he who does not ask a question remains a fool forever." - Chinese proverb.

12-06-06, 09:25 AM
^^ Good one but "The guy who asks too many questions in class gets beat up in the parking lot" -school ethics. :D

05-20-09, 05:02 PM
One more time!

05-23-09, 05:07 PM
just wondering witch is the Touring Model vin Y of 9 ??

05-23-09, 06:18 PM
Well, lesseee......If STS used to stand for Seville Touring Sedan and DTS used to stand for DeVille Touring Sedan, then I guess the VIN 9's are Touring Sedans.

05-25-09, 06:44 AM
Do you have a permanent red spot on your forehead from beating your head against your computer desk sub? lol

05-25-09, 07:16 AM
Just for reference, this thread is so old they were still making brand new Sevilles when the OP started this thread:banghead:

05-27-09, 01:51 AM
So Where Does the Extra 25hp Come From?? (Touring Models)

The little "T" in the badge on the back.