The car already has a perfectly good CAI from the factory. It and a WIX pleated filter wlll flow far more air than the engine can handle at WOT redline. You can use a ScanGauge-II to monitor intake air temp plus any 3 other gauges (except oil pressure), You might be surprised at how the intake temp runs and just how BAD some "CAIs" really are.

The PCM cannot be recalibrated for TB work, and the existing TB is already larger than the small 279 c.i. engine needs.

Won't fit, no one makes them, and the existing welded stainless steel manifolds are more than adequate. Thje main restriction is the left (front) bank crossunder pipe.

A good, mandrel bent 2.5 or 2.75 exhaust system is all you need - again, small engine. Be careful not to introduce a maddening highway speed exhaust drone..... you'll need a lot of Tylenol.

No one "tunes" the 2000 - 2004 Northstar PCM. Your VIN Y 275 hp 3.11 final drive, speed limited to 112 mph, is what you have forever. (Unless NP gets the thing hacked any time soon)

To install a 14150 Seville CORSA will take a LOT of intermediate exhaust pipe work.

Before you go butchering the car and engine, spend a week or so looking through the Seville, Deville, Northstar, and Tech Tips forums - and ask questions in here and in Northstar. Read all thew sticky threads in any forum of interest. CHRfab is out of business and never made parts for "stock" FWD Northstars anyway - only for sand rails, kit cars, and Fieros. Your car is speed limited to 112 mph - the tire service rating on the driver's door sticker - S.

The forum picture posting feature is currently dead due to a recent "upgrade". many informative pictures and diagrams are missing from threads/forums. For some Northstar (2000 - 2003) info, look through my albums - click my username, open the profile. Left column, 2 albums 6 pages of Northstar/Seville stuff. Yes, my STS runs a CORSA, and yes, I like it.

Here ............ https://www.cadillacforums.com/forums/attachment.php?attachmentid=108056&d=1368626184

You have now posted your e-mail on a HUGE worldwide, active forum. We currently have 255,057 members; 315 are online now as well as 4,596 "guests".

 

the more research you do - the sooner you will learn that there is NOTHING - YES - NOTHING -
that you can add on - bolt on - remove - pour in - pour on - pour over -
that will add one single horsepower - or a fraction of a mile per gallon of gas -

the developers were given a blank check to squeeze everything they possibly could - within reason -
and they did a great job -

in other words - there is absolutely no low-hanging fruit to pick -

1) A name brand cold air kit that will work in the Eldorado or is the $40 kit from Ebay sufficient?
the Eldo already has a CAI that can deliver MORE air than the engine could possibly use -

2) A larger throttle body that would be compatible.
just like the CAI - the current TB is able to deliver MORE ait than the engine could possibly use -
3) Shorty headers.
nothing available -
one user spent a small fortune having a custom-built true dual exhaust system built on his Eldo -
he lost 3 or 4 inches of ground clearance - and never responded to questions about ANY increase in power -

4) I'm going to use a magnaflow high flo from Northstar Peformance and 3" to the mufflers.
that WILL make it louder - louder doesn't add power -

5) Flow master 40s.
louder won't add power -

6) Custom Tune.
to date - no one - NO ONE - has been able to crack the 2000+ PCM -

7) Is Corsa Performance Exhaust - 14150 for a 2nd Gen STS compatible.
even if it was possible to modify the system to make it fit -
the end result would be LOUDER -

I am open to all suggestions concerning my project
the ESC is the "economy" version of the Eldo - 275HP and 311 final drive ratio -

bottom line -
you picked the WRONG CAR to mod -
keep it clean - keep it stock -
enjoy it for what it IS - and don't blame it for what it isn't - and never will be -

 

Thank you for the quick response and helpful insight.

....TB is already larger than the small 279 c.i. engine needs.
According to to my vin I have a 281 c.i. LD8. Is this correct for ESC? Does it make a difference on the throttle body size?

.....The main restriction is the left (front) bank crossunder pipe.
Anything that can be done about it?

.....(Unless NP gets the thing hacked any time soon) Just talked to Jake after calling three times and leaving a message he called me back on his cell. Which shows some good business ethics. He said around a month on the 2nd gen program but after seeing a lot of threads about NP I wonder how accurate the time frame is.

As for as the Magnaflow high flow cat, no resonator and Flowmaster 40s is there really going to be much of a noticable performance curve? If not is there any other route I can go to achieve a little more performance?

Thanks again in advance.

 

Ty Submariner409 and basscatt! Yeah, Ive done a lot of research and find that the general response is as cut and dry as you have both stated. Just wondering if there was any new developments. Hopefully NP will have this thing cracked in the time frame Jake stated. PCMperformance claims that they can crack it but Im still waiting for a reply.

"Northstar V8

Year Model/Engine/ECM Price

96-99 Cadillac Deville (DTS), Eldorado (ESC/ETC), Seville (SLS/STS) 4.6 L37/LD8 / Oldsmobile Aurora 4.0 L47 (PCM #16214848) $475

00-03 Cadillac Deville, Eldorado, Seville (SLS/STS) 4.6 L37/LD8 / Oldsmobile Aurora 4.0 L47 (P06 SIEMENS SIMTEC PCM) $475

04-05 FWD Cadilllac Deville (DTS), Seville / Pontiac Bonneville GXP 4.6 L37/LD8 (P07 PCM) $475

04-06 RWD Cadillac SRS/STS/XLR 4.6 LH2 (E22 ECM) $475

07+ Cadillac SRX/STS/XLR 4.6 LH2 (E67) $300

06-09 Buick Lucerne, Cadillac DTS 4.6 L37/LD8 (E67) $300

04-06 RWD Cadillac SRS/STS/XLR 4.6 LH2 (T68 TCM) $250"

 

Let's not quibble over 2 cubic inches of piston displacement or which conversion calculator we use for CID/CC. No matter how you cut it, the engine is still a tad smaller than a 1962 Chevy 283. Both of our Northstars are the same "size" - yours is a bit different in the cam/ignition/valve timing department. The VIN Y (your engine) was designed to be an economical highway cruiser. The VIN 9 (my engine) was designed to be a bit more "sporty" up in the rpm range. Your final drive is an economy 3.11:1; the VIN 9 is a 3.71:1 performance ratio. Each engine is calibrated to work with their companion transmission and the total calibrations for the two powertrains are quite different.

Crossunder pipe - minimal restriction, but you could hang a larger pipe and heat shield down under and lose about 2.5" of front ground clearance - which is already pretty sparse.

A muffler change and/or pipe change will do nothing. The cat is already a high-flow honeycomb unit. The resonator has no baffles - straight pipe with resonator chambers.

If you had a custom stainless steel system bent up and used a CORSA resonator and mufflers - for about $1600 or so - you might pick up 10 hp at wide open throttle redline shift. Nothing below about 5,000 rpm.

PCM Performance ??? Don't hold your breath. First time in 12.5 years in this site I've ever seen them mentioned.

You need to study the Cadillac Technical Archive. Please learn what you do and don't have before you try to make it better.

https://www.cadillacforums.com/cadillac-tech.html

 

Beautful STS btw!! Absolutely! I'm doing just that. I dont own the car yet. I plan on buying it tomorrow but obviously I'm doing my homework first. Ive wanted an Eldo since 94 but never came across one i could afford. I found a 00 ECS with 98000, 90% cosmetically inside and out, Florida car, only minimal I mean minimal surface rust on the undercarriage. Very minor oil pan and valve cover leak. Expected with the age. All it needs is a TCC solenoid. Which Ive already done my research on. ACDelco 24210864 $26 on Ebay. He was asking 2700 but Ill get it for 2000 because I explained the job that it can be replacing the solenoid. Other than that it still does 0-60 right at 7sec. Seems like it still has all the stock power which really is plenty but a little more power and throttle response is always nice. I just love the car. Mods or no mods I'm sold!!!! Thanks for the link I'm studying it now!!

 

According to to my vin I have a 281 c.i. LD8.
ALL Northstar motors are called 4.6L -
the actual displacement is4565 cubic centimeters = 278.6 cu in -

Does it make a difference on the throttle body size?
NO - in fact - the ONLY physical difference between your LD8 motor
and the higher performance L37 motor is the intake cams -

and before you ask - NO -
installing the intake cams from the L37 motor into your motor will NOT increase your power -
not without the different tuning used in the ETC model Eldo -

The main restriction is the left (front) bank crossunder pipe.
Anything that can be done about it?
some have spent a LOT of time and effort grinding the inside overlapping -
NONE have reported ANY measurable performance/economy benefit -

after seeing a lot of threads about NP I wonder how accurate the time frame is.
don't hold your breath -
he - and others have been "working on it" for YEARS -

As for as the Magnaflow high flow cat, no resonator and Flowmaster 40s
is there really going to be much of a noticable performance curve?
actual PERFORMANCE increase? - NO - NONE -
but it will SOUND more powerful - thus giving the positive BUTT-DYNO effect of more power -

If not is there any other route I can go to achieve a little more performance?
NOPE -
as I said in post #3 - if modding is your thing - you picked the wrong car

 

Thanks guys!! You been a great help. Do es any one know where to get front, rear and side skirts and a soft top?

 

=========================
Do es any one know where to get front, rear and side skirts
no such things available for an Eldo -

and a soft top?
look for a local auto trim/upholstery shop -

 

No "ground effects" or skirts. Faux soft top is a dealer-recommended aftermarket local shop. NO soft tops are factory stock - all local aftermarket....... and if not done perfectly you're opening the door (a big door) for rust and corrosion as well as radical trunk leaks.

Badges and bling from www.biggdaddycaddy.com. Not cheap - it's all real GM/Cadillac.

 

Speaking of i need cigarettes!! [QUOTE}

I quit cold turkey from 3 packs of Marlboro in late 1979. One of the smartest things I ever did. At that time they were $1.50 a carton, sea stores.

 

If you are not subject to emissions testing then you can safely drive the car forever with a P 0741 and/or P 1860. The only loss will be about 1 - 2 mpg gas economy. TCC kicks in at road cruise loads over 43 mph and removes the last 300 or so rpm of converter slip. P 0741 is leaking (internal) seals in the converter and input shaft; P 1860 is the electrical failure of the operating solenoid itself. Neither failure will hurt the engine/transmission/car in any way.

Forget the Vogue tires (lousy tires) and go to a set of Cooper CS-5 Ultras. In your area you'll be glad you did.

Here's the TCC rpm/car speed tables for both your VIN Y and the VIN 9 cars. VIN Y stops at 115 mph because the car is speed limited to 112 mph.

https://www.cadillacforums.com/forums/attachment.php?attachmentid=392818&d=1464545824

Subscribe the car to a multi-year deal with www.alldatadiy.com - it's the GM service manuals online plus a LOT more. You're gonna need it.

The engine takes 5W-30 oil, 7.5 quarts with filter and the correct oil level is halfway up the hashmark.


<=== ADD XXXXXXXXXX <-- OPERATING RANGE ===========oo========================O


I happen to like Pennzoil Platinum 5W-30 and a WIX 51522 filter.

98,000 miles - study up (quickly) on the water pump drive belt system and change the tensioner pulley yesterday. Dead serious. Not the entire tensioner spring arm - the pulley. NAPA, Advance Auto - $24.

https://www.cadillacforums.com/forums/attachment.php?attachmentid=108090&d=1368627058

https://www.cadillacforums.com/forums/attachment.php?attachmentid=108084&d=1368626887

 

Thanks 409! Im on it!!

 

A set of Vogue Wide Trac White Walls
vogue tires are pure - WAY overpriced - CRAP
and the Eldo looks GREAT with blackwalls -

P0741 w/o the P18 code. Which after doing my homework
I was able to explain the extent of replacing either the solenoid with the engine in or out of the car
and the furthef extent of replacing the TC.
should have done a little more homework - or found this forum a little sooner -
P0741 without P1860 is caused by a worn out seal - deep in the trans -
replacing the solenoid will NOT fix the problem -
the ONLY cure is to remove and rebuild the trans -
and YES - it is recommended to replace the torque converter also -

The car still runs and shifts like a dream which leads me to believe that it is just the solenoid and not the converter.
Am I correct in "assuming" that is is only the solenoid
sadly - NO -
the "GOOD" news is that if you reside in an area without vehicle inspections -
you could choose to ignore the SES light and live with the "problem" forever -
the ONLY adverse side-affect is a 1 or 2 drop in highway gas mileage -
there are SEVERAL members that have had this issue for YEARS - with no additional problems -

the "BAD" news is that if you do reside in an area with inspections -
the ONLY way to fix the P0741 code is to replace the worn out seal which means rebuild the trans -
replacing the solenoid will do absolutely NOTHING -
because the solenoid is NOT the problem -

Speaking of i need cigarettes!!
you should quit smoking - BEST thing you'll EVER do -

 

=============================
[I

A set of Vogue Wide Trac White Walls [/B][/I]
vogue tires are pure - WAY overpriced - CRAP
and the Eldo looks GREAT with blackwalls -

I'll take your word for it and opt out on the vogue.

should have done a little more homework - or found this forum a little sooner -
P0741 without P1860 is caused by a worn out seal - deep in the trans -
replacing the solenoid will NOT fix the problem -
the ONLY cure is to remove and rebuild the trans -
and YES - it is recommended to replace the torque converter also -

Well thats a bummer!!

sadly - NO - the "GOOD" news is that if you reside in an area without vehicle inspections -

Its a Fl. car but i live in WV. So no "GOOD" news there.

you could choose to ignore the SES light and live with the "problem" forever -
the ONLY adverse side-affect is a 1 or 2 drop in highway gas mileage - there are SEVERAL members that have had this issue for YEARS - with no additional problems -

That on the other hand is good news!!

the "BAD" news is that if you do reside in an area with inspections -
the ONLY way to fix the P0741 code is to replace the worn out seal which means rebuild the trans -
replacing the solenoid will do absolutely NOTHING -
because the solenoid is NOT the problem -

Wasted $28 there. But its still "GOOD" news because I dont have to fool with the solenoid and the real issue won't damage my car.

you should quit smoking - BEST thing you'll EVER do

Amen to that. I only smoke 2-4 cigarettes during the week. Its the weekend when i work that matters. Still only smoke about 2 packs in 3 days.

Thank bass!

 

Will the computer tell me if I need new soft ride struts?

I know its a boat and its supposed to rock back and forth but the rear likes to sometimes rock side to side on the interstate if I hit a bump with only 1 wheel going around a turn or changing lanes. It doesnt do it til I get up to 60-70 mph. Is this normal?

 

My car occasionally throws the 0741 code. Btw speaking of cigarettes. I go through 2 sometimes 3 packs a week, at the age of 25! Ok, rarely ever 3 packs but an easy 2. I only been smoking cigarattes for about a year and a half. Trying to quit.

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