Northstar TB upgrade
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 9 of 9
Like Tree1Likes
  • 2 Post By BlueAngel#07
Northstar Engines and System Technical Discussion Discussion, Northstar TB upgrade in Cadillac Engine Technical Discussion; Does anyone know if there is a larger Throttle Body that can be swapped onto the 4.6 (04 SRX)? I ...
  1. #1
    Mr. Mohr's Avatar
    Mr. Mohr is offline Cadillac Owners Member
    Automobile(s): 2004 SRX V8 AWD Luxury Performance Package (Moonstone)
    Join Date
    Apr 2013
    Location
    Andrews AFB, MD
    Posts
    93

    Northstar TB upgrade

    Does anyone know if there is a larger Throttle Body that can be swapped onto the 4.6 (04 SRX)? I know I can port and polish it, but what about upgrading to say a 80mm or larger TB?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    41,499

    Re: Northstar TB upgrade

    Somebody must hype one - - - remember: the engine is PCM controlled - you'll need to have the fuel/air mixture mapping recalibrated.

  4. #3
    BlueAngel#07's Avatar
    BlueAngel#07 is offline Cadillac Owners Fanatic
    Automobile(s): DTS PERFORMANCE / 2007 DTS - GONE
    Join Date
    Feb 2013
    Location
    Minnesota
    Posts
    460
    Do you have to remap for a port and polish? Or just the upgrade to the larger body?

  5. #4
    Mr. Mohr's Avatar
    Mr. Mohr is offline Cadillac Owners Member
    Automobile(s): 2004 SRX V8 AWD Luxury Performance Package (Moonstone)
    Join Date
    Apr 2013
    Location
    Andrews AFB, MD
    Posts
    93
    I don't think so for a P&P. It's not really flowing mire air, just less restrictive I guess.

  6. #5
    BlueAngel#07's Avatar
    BlueAngel#07 is offline Cadillac Owners Fanatic
    Automobile(s): DTS PERFORMANCE / 2007 DTS - GONE
    Join Date
    Feb 2013
    Location
    Minnesota
    Posts
    460
    Quote Originally Posted by Mr. Mohr
    I don't think so for a P&P. It's not really flowing mire air, just less restrictive I guess.
    I hope so, I'm thinking p&p and a k&n since that's about all that can be done on the 4.6 without voiding warranty. Thanks for the info.

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    41,499

    Re: Northstar TB upgrade

    Considering that the OEM throttlebody and air intake system flows more air than the engine can handle at WOT redline, the whole discussion is moot.

    Connect a sensitive vacuum gauge to an intake side vacuum port. If you see less than an inch of vacuum at WOT redline, nothing short of forced induction will make it any better ................

    30" of vacuum = -14.7 psi at nominal sea level barometric pressure. Atmospheric pressure forces air into an engine depending on throttle opening - the engine does NOT "suck in" air - it creates a vacuum in the cylinders which atmospheric pressure attempts to equalize. (Naturo abhorret a vacuo.)

  8. #7
    BlueAngel#07's Avatar
    BlueAngel#07 is offline Cadillac Owners Fanatic
    Automobile(s): DTS PERFORMANCE / 2007 DTS - GONE
    Join Date
    Feb 2013
    Location
    Minnesota
    Posts
    460
    Good to know that it's a waste time, I have officially given up on trying to do anything to my N*, in fact , I am happy with the way it is. Thx for the heads up.

  9. #8
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    41,499

    Re: Northstar TB upgrade

    Air filters - be VERY careful about spending big bucks for a so-called "performance" oil-wetted filter. The GM MAF does NOT like them. A Fram, AC Delco, WIX, Purolator, PartsMaster pleated panel filter has a LOT of surface area (pull the pleats open) and actually filters down to the micron level. And, for $6.79, you throw it in the trash and drop in a brand new clean one.

    GM MAF's - I fooled with a JET Performance MAF in my STS a few years ago - it's a mechanically modified OEM DELPHI MAF - and all it did was to give the engine an off-idle bog, midrange stumble, and cost me ~2 mpg lower gas mileage. Not a seat-of-the-pants assessment, either. Two 1700 mile round trips to/from Florida, using the original MAF one way, the JET the other, same Shell gas, same load. It's still on the garage shelf. Pictures in my albums. (For the cars with a divorced MAF - picture - the tiny black bead at the edge of the bore is the IAT thermistor. The honeycomb "screen" is actually an airflow straightener - just like in a wind tunnel. You can barely see the 3 heated resistors between the bridges which are part of the airflow calculation circuits - don't mess them up and don't get oil on them !)

  10. #9
    CadillacLuke24's Avatar
    CadillacLuke24 is online now Cadillac Owners Connoisseur
    Automobile(s): Alexandra - 96 SDV
    Join Date
    Jul 2010
    Location
    Middle of Nowhere
    Age
    23
    Posts
    4,770

    Re: Northstar TB upgrade

    Quote Originally Posted by BlueAngel#07 View Post
    Good to know that it's a waste time, I have officially given up on trying to do anything to my N*, in fact , I am happy with the way it is. Thx for the heads up.
    They ain't settin' the world on fire, but they are potent sleepers

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting