Tuning EFI - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 04-26-2005, 05:27 PM
zipfactor's Avatar

Last journal entry: Just starting
Last photo:
Join Date: Jul 2003
Location: Ohio
Posts: 297
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Tuning EFI

Hey all,

I was wondering if there was a way to hook into a car's efi system to change shift points, etc. Do you have to buy a whole new computer that is tunable for the car, or just software , or both? just wondering, thanks all.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 04-26-2005, 09:24 PM

Last journal entry: Robs34 - Done my dash
Last photo:
Join Date: Nov 2004
Location: Adelaide Hills South Australia
Age: 62
Posts: 110
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
EFI tuning

EFI tuning is a science that is carried out at the factory using megabuck computers and teams of engineers. What results is usually a specific "fuel map" for each car using a particular engine/ trans combo. In older cars this specified program was replaceable as a chip known as an electronically erasable programmable read only memory or EEPROM for short. Performance gains could be made by substiuting the chip with a performance type. Usually these chips would have longer injection times and allow better fuel delivery under acceleration, on some cars you could fool the computer by putting a resistor in the water temp sender making it think the engine was colder than it really was and so adding more fuel; unfortunately both these methods were not much good without extra modifications like bigger air inlets for instance. A stand alone computer can be programmed from a laptop to alter the fuel map for ultimate performance gain but it is expensive and needs to be primarily set up by computer boffins to get the car running in the first place, then you go for a blast and adjust the fine tuning. Transmission shift points are often set as part of the powertrain control module which is a fancy name for engine and trans computer in one. The same can be done to them as the transmissions controlled by them are shifted using electric solenoids inside the transmission, you can also make a shift alteration device by tapping into the wiring and making a manual control system, but I would do a fair bit of research before I started because you can trash a transmission very easily by putting it in two gears at the same time, make sure the solenoid sequence is right! So if you decide to do this sort of stuff you might even be able to make a career of it by selling your devices to others, good luck !!!

Cheers from Australia

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-26-2005, 11:30 PM

Last journal entry: Got the backside done (more or less)
Last photo:
Join Date: Jan 2004
Location: sacramento
Posts: 158
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
[QUOTE=zipfactor]...if there was a way to hook into a car's efi system to change shift points, etc. Do you have to buy a whole new computer that is tunable for the car, or just software , or both? QUOTE]

My current project has an EFI engine with a PCM (controls engine and transmission). I used a different transmission (4L60E) and did not want to try'n use the PCM to drive it so I purchased an aftermarket TCU (Trannsmission Control Unit) from TCI (there are others). While this stuff ain't cheap it is pretty neat as I can alter several parameters from my laptop. I can even set up and 'store' multiple shift schedules (i.e. racing, towing) and choose them at will.
So to answer your question, at least in my case, yes, I bought a new computer (software included).
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tuning EFI and large cams TurboS10 Engine 0 03-12-2004 09:07 PM
what first? advance curve or carb tuning? dirtydave Engine 3 11-07-2003 04:42 PM
ZZ$ with EFI powermite General Rodding Tech 2 09-17-2003 12:06 AM
Edlebrock EFI vs. Holley EFI trick66 Engine 2 03-22-2003 03:43 AM
Ford Falcon EA-Carburettor or EFI?? stonecold42 Hotrodders' Lounge 4 12-07-2002 02:25 PM

All times are GMT -6. The time now is 01:12 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.