Speed Density - Ford Truck Enthusiasts Forums



1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Speed Density

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 05-10-2009, 11:54 PM
nolls nolls is offline
New User
Thread Starter
 
Join Date: Apr 2009
Posts: 2
nolls is starting off with a positive reputation.
Speed Density

How come speed density limits the mods you can make to your motor (ex. supercharger, turbo)? If you are essentially putting more air into the cylinders, won't the manifold pressure increase, and therefore the fuel injected will increase?
Reply With Quote
  #2  
Old 05-11-2009, 01:59 AM
BucksTrucks's Avatar
BucksTrucks BucksTrucks is offline
Senior User
 
Join Date: Jul 2005
Location: USCGC Never Home
Posts: 347
BucksTrucks is starting off with a positive reputation.
I read somewhere that you can run forced induction with S/D, you only run in to problems with cams with to much overlap. And you dont want a lot of overlap with forced induction anyways.
Reply With Quote
  #3  
Old 05-11-2009, 03:09 AM
86F150302's Avatar
86F150302 86F150302 is offline
Postmaster
 
Join Date: Dec 2007
Location: Jacksonville FL
Posts: 3,052
86F150302 has a very good reputation on FTE.86F150302 has a very good reputation on FTE.86F150302 has a very good reputation on FTE.
Yes you can run a supercharger on SD. Im getting one soon and running it on SD. Alot of Lightning guys still run SD but with a tune from a Tweecer.
Reply With Quote
  #4  
Old 05-11-2009, 06:49 AM
frederic's Avatar
frederic frederic is offline
Post Fiend
 
Join Date: Oct 2003
Location: New Jersey
Posts: 6,212
frederic is a name known to allfrederic is a name known to allfrederic is a name known to allfrederic is a name known to allfrederic is a name known to allfrederic is a name known to all
The problem is not speed density EFI. The problem is Ford speed density EFI isn't very hacked and difficult to work with because most of the Ford EEC editors (freeware and commercial) really do not support these EEC's very well, if at all.

Of course if you're familiar with the Intel 8051 processor and have countless hours to reverse engineer a particular ford EEC down to the source code level, you can make that EEC do anything you want - even control Christmas lights.

See, things like Tweecer and similar products focus on Lightenings and Mustangs, because those are the vehicles typically used as the foundation for high performance "street toys" that will have forced induction.
Reply With Quote
  #5  
Old 05-11-2009, 10:17 AM
Conanski's Avatar
Conanski Conanski is offline
Post Fiend
 
Join Date: Jun 2006
Location: Ottawa, Ontario
Posts: 23,541
Conanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud ofConanski has much to be proud of
As stated the Ford SD system is compatable with forced induction because these kits include an FMU to boost fuel pressure so no extra tuning is necessary. SD is only restrictive when it comes to naturally aspirated mods like cams and heads because the computer is programmed for a stock motor and has no way to recalibrate itself to these high flow components, and in general isn't supported by aftermarket tuning systems.
Reply With Quote
  #6  
Old 05-12-2009, 09:13 PM
EPNCSU2006's Avatar
EPNCSU2006 EPNCSU2006 is offline
Post Fiend
 
Join Date: Nov 2002
Location: Concord, NC
Posts: 9,338
EPNCSU2006 has a very good reputation on FTE.EPNCSU2006 has a very good reputation on FTE.EPNCSU2006 has a very good reputation on FTE.EPNCSU2006 has a very good reputation on FTE.
Manifold pressure can't measure air flow, so if the airflow for a given manifold pressure changes (i.e. big heads or cam upgrades), the fuel calibration will be incorrect.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Speed density Sixtone 1987 - 1996 F150 & Larger F-Series Trucks 11 03-19-2015 06:26 PM
Tweecer with Speed Density theedge900 Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) 0 10-19-2004 11:03 AM
Speed density vs. Mass air JAYNESStheGreat 1978 - 1996 Big Bronco 5 05-26-2003 01:25 AM
What 460 mods wtih speed density? ScottP460 Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460) 1 03-28-2003 09:27 PM
Speed Density and Camshaft Swaps. Who has done it? tsheriff 1987 - 1996 F150 & Larger F-Series Trucks 8 11-09-2002 01:30 AM


Go Back   Ford Truck Enthusiasts Forums >

Tags
density, eec4, ford, processor, speed, upgrades

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 07:25 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.