hows the ecm gonna like this - Hot Rod Forum : Hotrodders Bulletin Board -- 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 09-17-2004, 09:44 PM
Join Date: Jul 2003
Age: 29
Posts: 179
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
hows the ecm gonna like this

ok guys so i have a mild 383 build up its got about 9.5:1 comp ratio and the came is the comp cams 274 .490 230 and 236 well this is going into an 87 iroc camaro and was wonderin how the ecm is going to like that cam. it a tpi setup and its gonna stay that way.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 09-18-2004, 04:35 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
Is this the stock ECM? If so it`s not gonna run too well.
First off, the ECM don`t know you moved the cubic inches up, and it`s fuel table is set for the engine that came in the car.
Secondly, the vacuum signal is the link between the engine and the computer that determines the load on the engine, it controls how much fuel it gets as well as spark advance, the bigger cam will make the engine have less vacuum, and that will make the computer think your in the throttle when your not and the car will run rich. It needs to have 16 inches of vacuum, and with that cam it`s not likely going to. Your going to need to have the changes made to the computer and the chip.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-18-2004, 09:45 AM
edge's Avatar
Time is short, are you ready?
Last photo:
Join Date: Jun 2004
Location: South Carolina
Age: 48
Posts: 658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Make a Game Plan First

Originally posted by jo5hi3
ok guys so i have a mild 383 build up ...
It was only 09/12/04 that you were considering stroking the original 305. Now you have a 383? Well, if so, you made the right choice

Based on your most recent posts, it is clear you now little if anything regarding the TPI system. I would recommend that you take some time to read TPIS' "Insider Hints Handbook" before you go any further with your TPI project, regardless of the engine you build.

Your ECM will require a custom chip to deal with the increased fuel requirements and deal with vacuum problems just as DoubleVision said earlier. Furthermore, there is no way your stock 305 injectors will handle a 383. Maybe a 350 with increased fuel pressure and a mild build-up. But all of this and much, much more is discussed in the TPIS handbook.

After you read this book, make a written list of you what you want to do with this engine and car. That way you realistically define your goals and most importantly, you can put dollar figures on each item. A third gen. Camaro is a great car for a project such as yours. But since you are starting with a stock car, you will also need to consider upgrading things like exhaust, cooling/radiator, converter, traction (i.e. torque arm), etc when you upgrade the engine. You will be spending a great deal of money and at 17, that's a lot burgars flipped, or maybe that's not an issue since mom and dad are footing the bill.

Everything I am only telling you is from first hand experience (lessons learned). Read the book, make a list, and then you will have a solid basis for your project. There is no sense in running every single question you have on this board, especially when less than half the information required to answer the question(s) is posted.

Two awesome TPI sources are Street & Performance and of course Tuned Port Induction Specialities, Inc. (TPIS)

Best of luck, Ed.

If God were to ask you;”Why should I let you into my Heaven?”;, what would you say? If you are not sure, then click Here.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-18-2004, 04:49 PM
Siggy_Freud's Avatar Moderator
Last photo:
Join Date: Dec 2003
Location: Portland, Oregon
Age: 32
Posts: 2,373
Wiki Edits: 0

Thanks: 1
Thanked 2 Times in 2 Posts
You will want to re-chip the computer. However, the 87 ECM is not run based on the vaccum in the system. While vaccum does help control the fuel pressure regulator, the system is run based off the Mass Airflow Sensor and will not be as affected by the change in vaccum.
Bringing history and technology together.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-18-2004, 05:29 PM
killerformula's Avatar Moderator
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 36
Posts: 3,536
Wiki Edits: 3

Thanks: 30
Thanked 39 Times in 26 Posts
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

All times are GMT -6. The time now is 12:44 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 1999 - 2012. All Rights Reserved.