4.3 TBI info - 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> Engine
User Name
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 12-27-2006, 08:16 AM
DoubleVision's Avatar
Not Considered a Senior Member
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 43
Posts: 10,733
Wiki Edits: 0

Thanks: 19
Thanked 77 Times in 71 Posts
4.3 TBI info

Since I`ve been involved with cars I`ve always delt with V8`s with carbs, now I`m down to something new, a 4.3 chevy V6 with throttle body injection.
I don`t know a whole lot about fuel injection, but from what I`ve read I`ve learned some. Here`s a list of the parts I have:
Isky Hydraulic roller cam, 206 intake, 209 exhaust duration @.050, .450 intake, .465 exhaust lift, computer compatible, springs, locks retainers from isky that match the cam, Milodon double roller timing set, comp 1.6 ratio roller rockers, comp pushrods, Manley pro flo necked down 1.94 intake valves, heads are stock swirl vane reworked with new guides that I mildly pocket ported, edelbrock performer tbi intake, msd heli core plug wires, msd coil, speed pro 4 valve relief flat top pistons that I`m having balanced, a K&N air filter, TBI injector spacer, ported TBI body, vacuum controlled fuel pressure regulator, with bung for fuel pressure gauge, remanned and balanced fuel injectors. My concern is the computer, I don`t want to have to battle the "service engine soon" light, will I need a new chip? How much do I need to go up on fuel pressure? What else am I missing? I don`t plan to race it, I just want it to be a fast revving torque engine that makes decent power to 5000 RPM. I thought I should have used the smaller isky cam, but the techies at isky recommended this one. Any help is appreciated.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 12-27-2006, 09:01 AM
King of my Man-cave.
Last photo:
Join Date: Nov 2003
Location: Michigan
Age: 58
Posts: 2,912
Wiki Edits: 0

Thanks: 6
Thanked 18 Times in 15 Posts
The biggest problem with the TBI computers that I have seen is that they don't like a big increase in airflow or too much cam duration. such as the addition of Vor-Tec heads or a lumpy cam. With the mildly worked TBI heads and the computer compatible cam you should be OK, although you may not reach the full potential of the engine without an improved chip. You don't say what kind of exhaust you will be using, headers may push you into engine light on territory.

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-27-2006, 09:48 AM
DoubleVision's Avatar
Not Considered a Senior Member
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 43
Posts: 10,733
Wiki Edits: 0

Thanks: 19
Thanked 77 Times in 71 Posts
Thanks Tom. Since headers cost a arm and a leg I decided to stick with stock exhaust manifolds that I lightly ported, each runner has a lump right into the entrance that I smoothed out. the exhaust is 2 pipes running into one with a turbo muffler then back into 2 pipes that exit out the back. I`m running a 5 speed tranny, and a peg leg 3.42 rear gear that I plan to convert over to a limited slip unit in the future.
Reply With Quote Quick reply to this message

Recent Engine 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
Need info about the th350 transmission joe350s10 Transmission - Rearend 1 07-01-2006 09:44 PM
Swapping TBI to Carb - What intake? Coleslaw Engine 2 06-17-2006 12:18 PM
TBI assistance needed jack kelley Engine 5 05-24-2006 10:11 AM
'87 chevy pickup 4.3 L TBI burnt ex. valve daveEM Engine 2 03-13-2006 06:32 PM
AOD into mustang Stangman196700 Transmission - Rearend 3 12-16-2004 08:51 PM

All times are GMT -6. The time now is 04:42 PM.

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.