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1993 Cadillac Eldorado Sport Coupe 4.6L Northstar "Y"
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130 Posts
Discussion Starter #1
I plan on doing a custom air intake. I DO UNDERSTAND THIS IS A CONTROVERSIAL ISSUE! I wanted to figure something out for myself and post a thread to see if my 2 ideas are worth it or not.

Idea #1: take alum. piping from TB to airbox and just cutting the hole larger to fit the pip into existing airbox, place performance filter in stock airbox.

Idea #2: remove airbox, install alum. pipe with open cone design in place of stock airbox.

Let me know what works best with these N*'s, some vehicles perform better with the cone while others with the airbox. I just never have experimented with the N*'s regarding these setups, only have experiences with f-body's with air intake setups. Any opinions help! Thank you :thumbsup:
 

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1993 Cadillac Eldorado Sport Coupe 4.6L Northstar "Y"
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130 Posts
Discussion Starter #3
The best air intake is OEM. Don't ruin it! :tisk:
Would running a alum. pipe replacing the plastic from airbox to TB be worth it at least. Its seems straight forward, less restriction. Like i said, new to Cadillac in regards to any air intake mods, but f-body's give a noticable performance increase in those types of mods, i am just trying to figure out if i will get the same result in the Eldorado.. otherwise im usually typically strict to not mess around with stock air intakes other than the filter itself.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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70,672 Posts
The stock cold air intake already flows more air than the engine can use at wide open throttle, redline.

Instead of throwing away money on a K&N overpriced oil wetted filter, take a look at FRAM, PartsMaster or similar panel filters - 60 pleats. WIX has 80 pleats. More surface area = less flow restriction.

Don't get creative with the MAF, either. If your unit has a honeycomb flow straightener, it's there for a reason: same principle as the flow straighteners in huge wind tunnels: less turbulence in the air through the throttlebody.

The 25 cent resistor built into a $69.99 "chip" for the IAT connector will cost you gas mileage, rich mixtures, and fuel/air codes.

You can read all the hype you want, but a lot of us have spent a lot of money and time on fooling with so-called "CAI" mods for the Northstar FWD package and the net result is essentially ZERO !! Remember that your Y drivetrain is already missing the extra 25 hp of the 9, as well as having a much taller final drive - 3.11:1 - so you're already in the highway economy realm, and there's precious little you can do about it. I'd bet that even a bored throttlebody would produce a nasty off-idle bog and a midrange-to-WOT (passing situation) stumble due to excess airflow (lean fuel mixture).

EDIT at 0940 - Saw N*Caddy's post - yep, the 1993 Y was a 295 hp rating......... my bad. The initial fuel ratio at sudden WOT with too much airflow DOES go lean, creating the stumble, until trim goes richer to compensate for the excess air.
 

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1997 Cadillac STS (BOSE w/AUX In, Massage Seats, URPAS, "Z")
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6,405 Posts
The plastic is actually rubber for a reason, the engine rocks around while the air intake is bolted to the car body.
Also do you really think 5 inch of aluminum pipe makes ANY difference? Actually plastic is better heat insulator than aluminum so your air will be cooler with the plastic than the aluminum.
Have a look to the diameter of the throttle body and the intake. You can over intake the thing as much as you want but the throttle body and intake manifold are still the same. Plus these things were designed for the engine, there is nothing you can do to put more air in unless you put a blower or a turbo...but let's not go that route.

This engine was designed with no compromise, that's why not to many people bought it new, price was a issue.
Also you may not know the N* originates from a racing engine designed by Lotus in the very late '80s, was bolted in few Corvettes in the very early '90's and then modified to be suitable for a luxury car like the Allante. If there was something they could have squeezed more from the regular aspiration engine they would have done it, the cost was not an important factor at the design stage.

You may see people claiming their Cadillac makes 330HP after the air intake and exhaust job. All they have is car that spits running rich codes (yeah that's right rich not lean) and a headache from driving the car with that horrible noise. The reality after all those "updates" they may have less than 300HP.

I just noticed you have a '93, that's a 295HP. Well they got 300 HP out of it once they changed the intake after '94. Not sure how doable is in yours.
 

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1993 Cadillac Eldorado Sport Coupe 4.6L Northstar "Y"
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130 Posts
Discussion Starter #6
alright, good to know! lol. next timem i'll keep that in mind if i ever start thinking about that again.:thumbsup:
 
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