Northstar Tuning

[eldorado1]

Originally Posted by Highline Cady

2nd, it revs up higher I believe stock it was just under 6000 rpm now it is about 6400-6500.

Are you aware that the stock rev limiter is 6200 rpm?

You are very seriously risking floating valves and grenading lifters. I HOPE that rpm is a mistake on your part, and you never went above 6200.

[AJxtcman]

Originally Posted by eldorado1

Are you aware that the stock rev limiter is 6200 rpm?

You are very seriously risking floating valves and grenading lifters. I HOPE that rpm is a mistake on your part, and you never went above 6200.

I don't think so.
The spring rate is great. Valve Open 130.2-141.9 lb @ 0.9646 in
The 2000+ has Stationary Hydraulic Lifter Adjuster
7000+ no problem.
Yes the shift point is higher on a VIN 9.
I just went over the snap shots of the SLS I did. On the 20 second 0 to 100 it shifted at 6075 RPM 1 to 2 and 6000 2 to 3. after the reprograming the 1 to 2 was at 6265. I think it was actually 6300 RPM but the marker won't line up with the peak.

7000 may dry the sump up. Hmmm. 7000 RPM in sandrails.

[eldorado1]

Ahh, sorry, I missed that he had a 2000+

[jadcock]

The SLS actually did have softer valve springs compared to the STS, but that was back in the 1994-1995 timeframe. By the mid-90s, all Northstars had the stiffer L37 valve springs.

It would be interesting to see if raising the shift point on an LD8 car improves performance. LD8 horsepower peak is at 5600 rpm and torque peak is at 4000 rpm, which is probably why they programmed the shift points where they did. The L37's horsepower peak isn't until 6000 rpm, which is probably why they programmed that version to shift at 6400-6500 rpm. Mine does the 1-2 shift at WOT anywhere from 6300-6500 rpm (it will vary).

[msta293412]

I have a 2001 STS , and it shifts at 6800 RPMS, Before I put an intake and exhaust on , it shifted at 6700 on its own. Not sure if it shifts any later, that it would create any more power ( or damage for that matter), Remember, my car runs on 87 octane, Lots of room for improvment, with a timing advance and 93 octane alone....Thanks for reading this.

[AJxtcman]

Bert came in this morning with doughnuts for the entire dealership.

[ejguillot]

msta293412, your STS shifts at 6700-6800 RPM? I feel a little cheated, my 2000 STS (August 1999 build date), though equipped with the coil on plug ignition, will shift at 6300 RPM, with fuel cutoff at 6500.

AJxtcman, is it possible that my particular N* engine, though COP, may still be based on the older 10.3:1 compression ratio heads? Otherwise, why would I get the 99 and earlier shift point? (and can this be corrected through a PCM reprogram?)

[AJxtcman]

Originally Posted by ejguillot

msta293412, your STS shifts at 6700-6800 RPM? I feel a little cheated, my 2000 STS (August 1999 build date), though equipped with the coil on plug ignition, will shift at 6300 RPM, with fuel cutoff at 6500.

AJxtcman, is it possible that my particular N* engine, though COP, may still be based on the older 10.3:1 compression ratio heads? Otherwise, why would I get the 99 and earlier shift point? (and can this be corrected through a PCM reprogram?)

No it is a seimens PCM.

This is one of my points. GM uses many programs just for US cars with the same engine option.
John looked for and Eldo for awhile. He found one in Ohio. He drove out picked it up and brought it straight to me. He chose an 02 ETC. He wanted the Case halves resealed under warranty. While the engine was out he wanted to send the heads out to California to a very popular Cadillac performance shop. I replaced all the piston installed the heads that had just been cleaned up in my opinion. He got robbed. When it was all done he was so disappointed he sold it. I have never seen a fast 00 to 02 Eldo!!!
Why a DTS or an STS will light the tires up hard core on 1st to 2nd.
This is all in the software.
I even tried to adjust cam timing (long story) HE sold the car after all the time and money!
.
.
.
I can load a factory select program for anyone that does not want a altered program.
This would be just a very good running factory car. If anyone is scared of loosing reliability this would be a good option.

[AJxtcman]

1999 Cadillac Seville (LD8 (VIN Y))
• Valve Timing (With Ramp at 0.100 mm Lift), Intake Opens 8 degrees BTDC
• Intake Closes 55 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC
• Valve Lift, Intake 8.6 mm 0.339 in
• Exhaust 8.6 mm 0.339 in
• Duration (@ 0.100 mm Lift), Intake 243 degrees
• Exhaust 244 degrees
• Valve Overlap (@ 0.100 mm Lift) 22 degrees

1999 Cadillac Seville (L37 (VIN 9))
• Valve Timing (With Ramp at 0.100 mm Lift), Intake Opens 13 degrees BTDC
• Intake Closes 73 degrees ABDC
• Exhaust Opens 51 degrees BBDC
• Exhaust Closes 13 degrees ATDC
• Valve Lift, Intake 9.4 mm 0.370 in
• Exhaust 8.6 mm 0.339 in
• Duration (@ 0.100 mm Lift), Intake 266 degrees
• Exhaust 244 degrees
• Valve Overlap (@ 0.100 mm Lift) 26 degrees

2000 Cadillac Seville(LD8 (VIN Y)) 1.7 rockers?
• Timing, @ 0.150 mm [0.006 in] Lift, Intake Opens 5.6 degrees BTDC
• Intake Centerline 113 degrees ABDC
• Intake Closes 236.8 degrees ABDC
• Exhaust Opens 222.5 degrees BTDC
• Exhaust Centerline 107 degrees BTDC
• Exhaust Closes 13.8 degrees ABDC
• Camshaft Lift, Intake 6.15 mm 0.2421 in
• Exhaust 5.94 mm 0.2339 in
• Valve Intake 10.500 mm 0.4134 in
• Exhaust 10.000 mm 0.3937 in
• Duration, @ 0.150 mm [0.006 in] Lift, Intake 242 degrees
• Exhaust 236 degrees
• Valve Overlap, @ 0.150 mm [0.006 in] Lift 1.98 degrees


2000 Cadillac Seville(L37 (VIN 9))
• Timing, @ 0.150 mm [0.006 in] Lift, Intake Opens 0 degrees

• Intake Centerline 122 degrees ATDC
• Intake Closes 251 degrees ATDC
• Exhaust Opens 225.5 degrees BTDC
• Exhaust Centerline 106 degrees BTDC
• Exhaust Closes 20.5 degrees ATDC
• Camshaft Lift, Intake 6.15 mm 0.2421 in
• Exhaust 5.94 mm 0.2339 in
• Valve Lift, Intake 10.500 mm 0.4134 in
• Exhaust 10.000 mm 0.3937 in
• Duration, @ 0.150 mm [0.006 in] Lift, Intake 251 degrees
• Exhaust 246 degrees
• Overlap, @ 0.150 mm [0.006 in] Lift 2.04 degrees


2004 Cadillac Seville(LD8)
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 236 degrees
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 242 degrees
• Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
• Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in
• Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 1.98 degrees
• Camshaft Runout 0.050 mm 0.0020 in
• Camshaft Thrust Surface
• Runout 0.037 mm 0.0015 in
• Width 22.990-23.090 mm 0.9051-0.9091 in
• Camshaft Timing @ 0.150 mm (0.006 in) Lift
• Intake Opens 1.3 degrees BTDC
• Intake Centerline 117.0 degrees ATDC
• Intake Closes 237.9 degrees ATDC
• Exhaust Opens 226.1 degrees BTDC
• Exhaust Centerline 111.0 degrees BTDC
• Exhaust Closes 5.1 degrees ATDC

2004 Cadillac Seville(L37)
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 246 degrees
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 251 degrees
• Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
• Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in
• Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 2.04 degrees
• Camshaft Runout 0.050 mm 0.0020 in
• Camshaft Thrust Surface
• Runout 0.037 mm 0.0015 in
• Width 22.990-23.090 mm 0.9051-0.9091 in
• Camshaft Timing @ 0.150 mm (0.006 in) Lift
• Intake Opens 0.3 degrees ATDC
• Intake Centerline 122.0 degrees ATDC
• Intake Closes 246.0 degrees ATDC
• Exhaust Opens 229.3 degrees BTDC
• Exhaust Centerline 110.0 degrees BTDC
• Exhaust Closes 11.2 degrees ATDC

2007 Cadillac DTS(LD8)

• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 236 degrees
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 242 degrees
• Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
• Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in
• Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 1.98 degrees
• Camshaft Runout 0.050 mm 0.0020 in
• Camshaft Thrust Surface
• Runout 0.037 mm 0.0015 in
• Width 22.990-23.090 mm 0.9051-0.9091 in
• Camshaft Timing @ 0.150 mm (0.006 in) Lift
• Intake Opens 1.3 degrees BTDC
• Intake Centerline 117.0 degrees ATDC
• Intake Closes 237.9 degrees ATDC
• Exhaust Opens 226.1 degrees BTDC
• Exhaust Centerline 111.0 degrees BTDC
• Exhaust Closes 5.1 degrees ATDC


2007 Cadillac DTS (L37)
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust 246 degrees
• Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake 251 degrees
• Camshaft Lobe Lift - Exhaust 5.94 mm 0.2339 in
• Camshaft Lobe Lift - Intake 6.15 mm 0.2421 in
• Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift 2.04 degrees
• Camshaft Runout 0.050 mm 0.0020 in
• Camshaft Thrust Surface
• Runout 0.037 mm 0.0015 in
• Width 22.990-23.090 mm 0.9051-0.9091 in
• Camshaft Timing @ 0.150 mm (0.006 in) Lift
• Intake Opens 0.3 degrees ATDC
• Intake Centerline 122.0 degrees ATDC
• Intake Closes 246.0 degrees ATDC
• Exhaust Opens 229.3 degrees BTDC
• Exhaust Centerline 110.0 degrees BTDC
• Exhaust Closes 11.2 degrees ATDC

[fubar569]

that is a hell of a variation between Y and 9 - and of models containing same, and between models!

[ejguillot]

Originally Posted by AJxtcman

No it is a seimens PCM.

This is one of my points. GM uses many programs just for US cars with the same engine option.
John looked for and Eldo for awhile. He found one in Ohio. He drove out picked it up and brought it straight to me. He chose an 02 ETC. He wanted the Case halves resealed under warranty. While the engine was out he wanted to send the heads out to California to a very popular Cadillac performance shop. I replaced all the piston installed the heads that had just been cleaned up in my opinion. He got robbed. When it was all done he was so disappointed he sold it. I have never seen a fast 00 to 02 Eldo!!!
Why a DTS or an STS will light the tires up hard core on 1st to 2nd.
This is all in the software.
I even tried to adjust cam timing (long story) HE sold the car after all the time and money!
.
.
.
I can load a factory select program for anyone that does not want a altered program.
This would be just a very good running factory car. If anyone is scared of loosing reliability this would be a good option.

OK... so for my 2000 STS, what years & models can i search for to find a donor PCM?

[AlBundy]

When you say factory program do you mean the way GM set up the cars that went outside the US. You know no limiter, more aggresive but still within GM specs?

[AJxtcman]

Originally Posted by ejguillot

OK... so for my 2000 STS, what years & models can i search for to find a donor PCM?

00 to 03 all Northstar powered
NO OLDSMOBLIES

[AJxtcman]

Originally Posted by ALBUNDY

When you say factory program do you mean the way GM set up the cars that went outside the US. You know no limiter, more aggresive but still within GM specs?

Not necessarily.
.
.
.
If you don't want to go out of GM's OEM specs I can find a USA Calibration for that year and engine aplication.
.
.

[AJxtcman]

Originally Posted by ALBUNDY

When you say factory program do you mean the way GM set up the cars that went outside the US. You know no limiter, more aggresive but still within GM specs?

Take a quess on how many calibration ID's they have for the first 100 cars in 03 built at HAMTRAMCK?
Just the Caddy CAL's out of the first 100 cars of total production
Both Buicks and Caddy's were built in Hamtramck since 2000.
How many VIN 9?
How many VIN Y?
How many USA?
How many Export?