Tuning a 700R4 - Page 2 - 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> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 05-27-2012, 09:24 AM
joshp83's Avatar
owner of Prices Garage
 
Last photo:
Join Date: Jun 2011
Location: west virginia
Age: 31
Posts: 330
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
weights and gear pitch is but body the same

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 05-27-2012, 12:09 PM
Registered User
 
Join Date: Sep 2008
Location: shelbyville in.
Posts: 169
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
so a 350 governor will fit and work in a 700r4.
thanks , learned something new.

ROGER
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 06-11-2012, 07:23 AM
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SE Michigan
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Well, the transmission is working fine at part and mid throttle. Unfortunately, at WOT, it still hangs at the rev limiter(5500RPM).

I think that I may pull that limiter chip and replace it with a 6000rpm chip to see if it may shift after 5500rpm. The engine has been dynoed and power falls off after about 5300, hence the 5500 limit that I had in the ignition system.

As I understand, WOT shifts are controlled via valve body......Is this for sure?......is there anything else that could impact WOT shift RPM?

Looking for a knob to turn

Thanks!!!!
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 06-11-2012, 07:20 PM
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SE Michigan
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
O
Another update. Made a small adjustment on the TV cable...slight loosening. From a dead stop, at WOT, it would rev to 6000....bounce the rev limiter. Then when revving up, it runs right up to 5800, shifts fine and then is on to 3rd, which goes fine too.

So, I am thinking that I can make a small adjustment in the springs and weights to do the final tuning.

One other issue is that I would like to solve is a shift from 1-2, under light throttle, that is too quick. Could this be due to the light weight, and the 4.30 gear? Is there a fix for this? I already have the lightest springs in the governor.....

Any ideas?
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 07-08-2012, 07:31 PM
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SE Michigan
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
another update

Ok...I have now pulled the governor and added weight.

Before and after RPM shift points

1-2 shift. Was 6000 RPM, which is on the rev limiter. Need to let off to shift
2-3 shift. Was 5900 and stayed right at 5900.
3-4 shift. Was 5900, and dropped to 4700.

So.....I am not sure how I can use the governor to move all of the shift points. Seems that the governor is having a big effect on higher gears. If I continue to add weight, I will lose a reasonable shift point in the 3-4 shift.

Also, I "could" simply lift a little during the 1-2 shift, but I plan on a nitrous shot that will rely on a micro switch detecting WOT, so lifting isn't what I would like to do.

Really looking for some ideas here... Thanks in advance.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 07-10-2012, 07:32 PM
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SE Michigan
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Starting over

Well, bit the bullet and dropped a new "corvette" governor in. Wot shifts are now:
1-2. 4000
2-3. 4300
3-4. 3700

So, I still have some variation in shift points, but I am back under the rev limiter.

Tomorrow I will "sneak" up on an rpm that will keep me around 5500rpm

BTW, I did get advice from a local transmission shop owner that said to forget the governor kit, and simply grind mass off of the existing weights. He said tha the kits work for th350s, but are more trouble on the 700r4.
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 07-30-2012, 07:05 PM
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SE Michigan
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Well, the mystery is solved. I got so frustrated after 18 random tries that I took the time measure the spring pressure of all the springs and spent time studying all of the combinations that I had tried. After all this work, here are the conclusions that anyone doing this MUST take into consideration.
1) springs can impact shift RPM just as well as weights. Don't make the mistake that weights alone determine rpms.
2) springs must be matched to weights. For example, you can have two weights and two springs that will behave MUCH different if you simply switch the springs and keep the weights the same.


In the end, I got my combination right on with a 1-2 shift at 5700 and a 2-3 shift at 5800. I started with 4000 rpm wot shifts and made most of my improvements by changing springs and dropping one of the weights.

Hope this helps someone...
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 08-01-2012, 09:09 AM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,840
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
Quote:
Originally Posted by revspan View Post

In the end, I got my combination right on with a 1-2 shift at 5700 and a 2-3 shift at 5800. I started with 4000 rpm wot shifts and made most of my improvements by changing springs and dropping one of the weights.

Hope this helps someone...
Been following your thread, glad you got it ironed out. Could you possible post what springs and weights you wound up using?

Thanks
Vince
Reply With Quote Quick reply to this message
  #24 (permalink)  
Old 08-01-2012, 09:18 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
Unless you're running the same rear gear ratio, His results/combos may not help you.
Reply With Quote Quick reply to this message
  #25 (permalink)  
Old 08-01-2012, 05:41 PM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,840
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
Quote:
Originally Posted by SSedan64 View Post
Unless you're running the same rear gear ratio, His results/combos may not help you.
I'm fully aware of that, just trying to compile a database.

Vince
Reply With Quote Quick reply to this message
  #26 (permalink)  
Old 08-01-2012, 07:23 PM
Registered User
 
Join Date: Sep 2008
Location: shelbyville in.
Posts: 169
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i m running the same, what s the setup please ?

thanks, roger
Reply With Quote Quick reply to this message
  #27 (permalink)  
Old 08-02-2012, 05:26 AM
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SE Michigan
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
NP...here is the final combination that I used. For the sake of addressing variation in different kits, I will also give some of the values that I measured for comparison.

Regarding springs. I took two measurements. First was at a compressed height of 0.25, second was at a compressed height of 0.35.

I used:
.25" .35"
Green spring 450g 350g
and
Black spring 1050g 850g

FWIW, stock "corvette" springs at 0.25" are 380g and 1400g. The kit has springs range from 290g to 1050g.

I would recommend that anyone tuning their governor find a small scale and measure their springs BEFORE they change them.....otherwise you could, will be flying blind.


Weights:

Stock, which is 0.5oz/14.2g
"B" weight from kit which is 0.45oz/12.75g

FWIW, weights from the kit ranges from 5.6g to 14.2g

Final combination had Green spring with "B" weight, and Black spring with stock weight.

I can't stress enough that you need to keep good notes during tests. It took some work to see the patterns in what needed to be changed to get this right. Now the thing drives like a dream!

So, in the end, I increased pressure of light spring, reduced pressure of the heavy spring to solve the problem of drastic differences in shift points from 1-2 to 2-3 shifts.

again.....if you don't know where you are starting, you are going to get frusterated. I sure was!
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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
427 BBC tuning help b00tz Engine 20 01-09-2012 05:07 PM
A lil tuning help bodydroppedsquare Engine 3 06-02-2008 09:49 AM
Tuning a 350 TBI help?? NOok Engine 10 07-24-2006 06:37 PM
What are the parts in a 700R4 2-3 TransGo shift kit 700R4 2-3 AngliaBob Transmission - Rearend 3 04-23-2005 11:25 PM
tuning help ranger Engine 0 03-16-2005 07:12 AM


All times are GMT -6. The time now is 05:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.