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1997 Seville STS
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54 Posts
Discussion Starter #1
why does the concourse get 25 extra horsepower and torque? what is different about the engine?
 

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Registered
1997 Seville STS
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54 Posts
Discussion Starter #2
difference between regular northstar and the northstar in a deville concourse?

why does the engine in a deville concourse get 25 extr horsepower and torque? what is different?

also, are they any more or less reliable, less likely to have head gasket issues, etc?
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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71,032 Posts
The VIN 9 powertrain uses a slightly different PCM program and intake cam overlap to develop higher horsepower further up in the power band at the expense of 5 ft/lb of torque. It uses a 3.71 final drive for quicker engine rpm rise in each gear range. Most specs list it as 300 hp/295 ft/lb.

The VIN Y powertrain is a more "economy" tune and cam setup which uses a 3.11 final drive for highway economy and reduced engine rpm at cruise. Most specs list it as 275 hp/300 ft/lb.

Discounting the tire rating speed limiters imposed, all things being equal, the VIN Y should outrun the VIN 9 in top speed, but above 135 mph factors like drag and weight come into play. It would be interesting to run two same-year same-style Northstar 4.6 FWD vehicles side by side at Bonneville. The ONLY physical differences being the drivetrain package. Which would eventually go faster, given no speed limiter in the PCM ?? Anybody's guess. Drag racing a FWD, same pair, is a guess also - on any Sunday a good driver in Car A will beat car B, and vice versa.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Re: difference between regular northstar and the northstar in a deville concourse?

You just double-posted this up in Deville. :thepan:
 

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Registered
1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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6,796 Posts
It depends on what year you're talking about. If its a 1994 or 1995 its because it has a different engine.
 

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Registered
1997 Seville STS
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54 Posts
Discussion Starter #6
Re: difference between regular northstar and the northstar in a deville concourse?

i realized after i posted that it might be more appropriate in this category, sorry
 

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Registered
1997 Seville STS
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54 Posts
Discussion Starter #7
what speed are cadillacs with the 4.6l northstar limited at? (I mean via a governor or similar device)

I'm not sure if it varies by model or something but I'm looking at 94-99 sevilles and eldorados, and 96-99 devilles
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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71,032 Posts
Depending on model and OEM tire installation, the speed limiter is determined by the tire speed rating on the sticker on the driver's door:

S = 112 mph
H = 130 mph
Z/W = 150 mph ++

You should look at your FWD car models in the 2000 - 2004 year range. Then you get all the powertrain updates and the roller cam follower engine.
 

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1998 DeVille / 173,000 miles
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121 Posts
Concours also has bucket seats with perforated leather, center console with shifter, analog gauges, Bose stereo, specific wheels, no hood ornament (it's in the grill), painted grill, mirrors in the roof for back seat, dual zone digital temp controls, road sensing suspension, magnasteer steering, fog lights.
 

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'08 DTS Lux III Blk Cherry, '89 Brougham d'Elegance Dip Blue
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4,847 Posts
Re: difference between regular northstar and the northstar in a deville concourse?

The Deville Concourse, Seville STS, and Eldorado ETC got the higher output engines. 300 hp and 295 lb ft torque. These are higher priced models that got more standard equipment and the sportier versions. Not positive on the Concourse, but I know the STS and ETC got Stabilitrac and CVRSS and firmer suspension to make the cars handle better. The N* in the regular Deville, SLS, and Eldorado were 275 hp, 300 lb ft.
 

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1997 Eldorado
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637 Posts
Re: difference between regular northstar and the northstar in a deville concourse?

whats added to them to et that extra 25hp?
 

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'08 DTS Lux III Blk Cherry, '89 Brougham d'Elegance Dip Blue
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4,847 Posts
Re: difference between regular northstar and the northstar in a deville concourse?

Others on here have much more expertise on these cars than I do and can answer that in more detail. I think that it's higher compression ratio, slight computer tune, and freer flowing exhaust.
 

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'98 ETC Black 90k miles
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1,061 Posts
Re: difference between regular northstar and the northstar in a deville concourse?

Different cam timing as well, from what I've read. But I'm a newbie with the N* as well, only engines I've ever worked on were the 3.3.L in my 89 Century and the 3.1L in my 97 Cutty Supreme.
 

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1997 Seville STS
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54 Posts
Discussion Starter #14
I drove a 98 deville d'elegance yesterday and I didn't like the all digital display I dunno I just like to have RPMs and I just prefer the analog look, so I guess that's a benefit for me.
 

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Super Moderator
2010 DTS
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87,551 Posts
Re: difference between regular northstar and the northstar in a deville concourse?

whats added to them to et that extra 25hp?
Different intake cam. Nothing more. Of coarse it has a different trans and PCM, but only the cam is different on the engine.

P.S. I merged the threads.
 

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'08 DTS Lux III Blk Cherry, '89 Brougham d'Elegance Dip Blue
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I was wondering where all the extra commentary from you came from ranger lol. I'm still amazed how much you and some of the other guys on here know about these cars and engines. I'm usually the biggest car nut that all of my friends know but you guys put me to shame.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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The Northstar compression ratios and exhaust systems are essentially identical in each model line.

VIN Y PCM management is set up for the different intake cam characteristics and the 3.11 final drive compared to the VIN 9.

With a single-cam engine you can fool with cam timing and accomplish basically two goals, with a variation on the theme in a 4-cam engine: advanced cam timings, about 4 degrees or so, move the power band down in the rpm range at the expense of HP but slightly increased torque. Retarded cam timings move the power band up higher in the rpm range with higher HP readings but slightly less torque. The 280 c.i. Northstar is a little engine, so there's a tightrope to be walked in the HP/RPM/torque search.
 
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