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Hi. I'm wondering can vin "y" camshafts on a northstar be swapped for vin"9" camshafts with out swapping ecms?

No this can not be done. The final drive gear ratio is different between the two types also, if you change the PCM, the PCM will also look for the correct final drive ratio, and you will have tranny problems


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi. I'm wondering can vin "y" camshafts on a northstar be swapped for vin"9" camshafts with out swapping ecms?

No this can not be done. The final drive gear ratio is different between the two types also, if you change the PCM, the PCM will also look for the correct final drive ratio, and you will have tranny problems

Thanks. I was just looking at the Hp ratings and the "9" motor is @ 300hp/ tq 295. The "y" motor is @ 275 hp/ tq 300. Is there a way to may up the 25 ponies lost in a "y" motor?

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Well truthfully, the 275 HP engine is quicker off the line, the CAM has more low range torque, whereas the 300 HP engine builds power higher in the range, so the 275 HP engine will kick butt off the line and run out of UMPH, and then the 300 HP engine will overtake...futher up the range

You probably can add 25 HP by opening up the exhaust system with a more free flow system. The big restriction according to the guru, who was a Northstar Powertrain Engineer who used to frequent this site is the front to rear crossover pipe, if you could find a solution that would help.


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Half the difference in acceleration is the more aggressive final drive ratio also, so 'just' getting the different revving pattern is not a perfect solution.

I also agree best to focus on the exhaust system first; it is less expensive to mod than other choices.


Bruce

2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

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I've heard a lot about the "faults" of the stock exhaust. Just to be sure I am on the same page here, is the front to rear crossover pipe the one that is flattened out? I'm a visual person, and not very good when it comes to naming exhaust parts.


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I've heard a lot about the "faults" of the stock exhaust. Just to be sure I am on the same page here, is the front to rear crossover pipe the one that is flattened out? I'm a visual person, and not very good when it comes to naming exhaust parts.

Yes, I had pointed out to you previously that the choke point in the exhaust system was the crossover pipe and it is the flattened out pipe that you see under the tranny/engine. A full sized pipe would not give enough ground clearance, and there is NO way to bring the pipe up through the engine compartment and back down, as is done in some GM cars. The crossover pipe while flattened out, is widened to allow for flow equivalent to a round pipe. I would not call it a fault, again since the engine puts out 1HP to 1 CU IN, I would call it a necessary compromise. The issue is, to put a full sized pipe in there what additional compromises would be required hurting appearances, air stream, etc

If I am not mistaken one of our members MARK used a full sized pipe from the front to the rear in his Turbo charged STS

Here is more on Marks Turbo charging work

http://caddyinfo.ipbhost.com/index.php?showtopic=24211

http://caddyinfo.ipbhost.com/index.php?showtopic=8837

http://caddyinfo.ipbhost.com/index.php?showtopic=448


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I've heard a lot about the "faults" of the stock exhaust. Just to be sure I am on the same page here, is the front to rear crossover pipe the one that is flattened out? I'm a visual person, and not very good when it comes to naming exhaust parts.

Yes, I had pointed out to you previously that the choke point in the exhaust system was the crossover pipe and it is the flattened out pipe that you see under the tranny/engine. A full sized pipe would not give enough ground clearance, and there is NO way to bring the pipe up through the engine compartment and back down, as is done in some GM cars. The crossover pipe while flattened out, is widened to allow for flow equivalent to a round pipe. I would not call it a fault, again since the engine puts out 1HP to 1 CU IN, I would call it a necessary compromise. The issue is, to put a full sized pipe in there what additional compromises would be required hurting appearances, air stream, etc

If I am not mistaken one of our members MARK used a full sized pipe from the front to the rear in his Turbo charged STS

Here is more on Marks Turbo charging work

http://caddyinfo.ipb...showtopic=24211

http://caddyinfo.ipb...?showtopic=8837

http://caddyinfo.ipb...p?showtopic=448

That is an impressive car! A lot of work went into that I can see. Amazing! I don't think I'd have the patience (or money) to pull something like that off.

I'll call the flattened out crossover pipe a necessary compromise as well. I know I'm not about to try changing it. My car has enough problems with ground clearance...


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Yes a LOT of money, you have no idea. Plus, Mark got to the power point where the transmission was no longer able to handle it, that was his conclusion at the end.


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Yes a LOT of money, you have no idea. Plus, Mark got to the power point where the transmission was no longer able to handle it, that was his conclusion at the end.

I read in there that it wasn't shifting until it passed redline. I wonder what has become of the car now. New transmission possibly? I'll find him and ask him....


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Yes a LOT of money, you have no idea. Plus, Mark got to the power point where the transmission was no longer able to handle it, that was his conclusion at the end.

I read in there that it wasn't shifting until it passed redline. I wonder what has become of the car now. New transmission possibly? I'll find him and ask him....

The stock transmission is only rated to handle so much power, the last time I spoke to him, his impression was that he had exceeded the transmissions maximum engine torque spec. He had it rebuilt a couple of times and he kept overpowering the clutches.


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ouch! That's awful. It's such a nice car!!!!


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Well truthfully, the 275 HP engine is quicker off the line, the CAM has more low range torque, whereas the 300 HP engine builds power higher in the range, so the 275 HP engine will kick butt off the line and run out of UMPH, and then the 300 HP engine will overtake...futher up the range

You probably can add 25 HP by opening up the exhaust system with a more free flow system. The big restriction according to the guru, who was a Northstar Powertrain Engineer who used to frequent this site is the front to rear crossover pipe, if you could find a solution that would help.

Body.... I have to agree. That crossover pipe is a joke. I know it has to go underneath the engine, but that's ridicoulos. That is something that I"m going to investigate. I wonder if the latter year N*'s have the same diameter or larger piping. I want 300/300!!!!!

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Given that I like these cars, I dont like to refer to anything as a joke, a SMART car is a joke. There were not many options to get the exhaust from the front bank to the rear of the engine. Here is a picture of a 4.9, you see how it was handled there. Unfortunately that can not be done on the Northstar

Buy an ETC, STS or Concours, walla....300 HP, tighter suspension, etc

dcp01226.jpg


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Buy an ETC, STS or Concours, walla....300 HP, tighter suspension, etc

The ETC, hardly ever see them. The STS is what I really wanted. Concours, a bit too much for me. The 600 i'm spending on a 98, that needs very little cosmetic wise. I really can't complain, but I stil want to extract more out of it. At least to get it to 300....

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I would say a CAT bad free flow exhaust system would open it up a lot

http://www.corsaperf.com/FAQs.aspx

What performance increase will I get with my system? Performance varies by the vehicle and system chosen. On average, CORSA systems will deliver a 3-5% increase in horsepower, though this may vary by vehicle. For example, our Corvette systems will see in average increase of 17-19 HP increases with the addition of our full cat-back system. In addition to HP increases, CORSA systems will dramatically increase free-air-flow, allowing your other performance modifications to achieve their full performance potential

Try this in the summer time it reportedly adds 2%

http://www.adaptivep...ance.com/TB.htm

By the way, I am not implying that you purchase that TB preheater by pass, you can just do it on your own with a small pipe and a couple of clamps. Be advised however that you could be prone to icing up..


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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You could also go totally nuts, but I am not sure if anything else in the car will work..LOL

http://www.chrfab.com/


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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