1985 Caprice Computer Controls What? - Chevy Impala Forums
User Tag List

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 05-20-2011, 08:18 PM Thread Starter
Z51R's Avatar
Join Date: Oct 2010
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
1985 Caprice Computer Controls What?

I have an 85 Caprice with the stock lg4 (700r4) transmission and a 305 (H) engine. I'm restoring the car but the engine will be the last thing and I hope it will last several more years. I took off about 25 pounds of emission equipment over the weekend and was able to improve my mileage by almost 3 MPG. It has dual exhaust with no cat and an H-pipe. Still no check engine light and there is a bulb in there!

What does the computer control in this car? When I check out the Hypertech and Jet performance chip sites they indicate that the computer chip will affect the transmission as well as advancing the timing. I know the computer controls the timing because there is no mechanical or vacuum advance in or on the distributor.

I was thinking a stage 2 chip with a 180 degree stat and a K&N air cleaner combined with dual exhaust might buy me 20 HP. If I can get less torque converter slip or a higher shift point out of it then I can really justify the money on a 305.
Z51R is offline  
Sponsored Links
post #2 of (permalink) Old 05-22-2011, 11:42 AM
8th Gen Antagonist
kingnutin's Avatar
Join Date: Mar 2009
Location: Vancouver , WA
Posts: 13,655
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 517
Thanked 1,226 Times in 803 Posts
The computer controls the advance, but not the base timing. It doesn't do anything with the transmission, your shift points are controlled by the TV cable. As for the torque converter, the 700R4 has a lock-up coverter, you can't get any less slip than that.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

kingnutin is offline  
post #3 of (permalink) Old 05-23-2011, 08:20 PM Thread Starter
Z51R's Avatar
Join Date: Oct 2010
Posts: 48
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Thanks for the info. The best power mod will be a new small block that is completely free of computers. Do you happen to know what the electrical plugs going into carb control?
Z51R is offline  
post #4 of (permalink) Old 05-23-2011, 08:29 PM
1st Year of the 5th Generation

77Impala's Avatar
Join Date: Nov 2007
Location: North TX
Posts: 6,989
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 445
Thanked 427 Times in 273 Posts
^Your computer has a lean burn setting which the computer tries to keep the engine as lean as it can for a carburetor.

Best power return for the money would be to buy a Vortec 350 and custom build it up with a 4 barrel carburetor and HEI from a late 70's Chevy engine. When I get one and start the rebuild I am shooting for between 325 and 400 hp out of it, and mate that up to a custom built 700R4 to handle 400 hp.

1977 Chevrolet Impala Sedan
1989 GMC C1500 Sierra ECSB
77Impala is online now  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user 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:


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.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Chevrolet : Caprice 1995 CAPRICE ECM Computer RSS Bot eBay Cars For Sale: Caprice 0 10-28-2010 05:50 AM
92 caprice classic 5.0 computer issues?? kil6 Mechanical and Electrical Problems 3 12-14-2009 08:13 PM
Statistics of both a 1985 Oldsmobile 442 and a 1985-1987 Caprice Classic? Nicest_Dude_in_Cali Chevy Caprice 1 05-19-2008 03:06 AM
My dad's 1985 Oldsmobile 442 vs. a 1985-1987 Chevy Caprice Classic? Nicest_Dude_in_Cali Chevy Caprice 1 05-15-2008 11:23 AM
how to short circiut athe computer spped limiter on 1992 chevy caprice so not frankiej662 Chevy Caprice 0 03-18-2008 08:57 PM

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

For the best viewing experience please update your browser to Google Chrome