Rev Limiter - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 19 (permalink) Old 04-23-2012, 02:26 PM Thread Starter
Jim
 
Jim's Avatar
 
Join Date: Oct 2008
Location: Anna, Texas
Posts: 125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rev Limiter

What is the maximum RPM on a 1967 400 motor in the GTO without risking breaking something.

Jim is offline  
Sponsored Links
Advertisement
 
post #2 of 19 (permalink) Old 04-23-2012, 03:07 PM
 
facn8me's Avatar
 
Join Date: Jul 2011
Location: Tulsa, Ok
Posts: 574
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I was told 5k was pushing it on my 66 389

https://www.gtoforum.com/signaturepics/sigpic18842_1.gif

1966 Pontiac Lemans Convertible
389 tri power
facn8me is offline  
post #3 of 19 (permalink) Old 04-23-2012, 03:38 PM
 
Instg8ter's Avatar
 
Join Date: Sep 2010
Location: Near Detroit
Posts: 3,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
yep Pontiacs are not high revers, with stock internals you want to stay below 5400 RPM, with forged rods and pistons they will push 6K and above if built right. Cam is the determining factor to make sure all your power comes on in the correct rev range and the beauty of our pontiacs is they make a ton of torque down low and can keep it coming right up to that 5000RPM and Torque equates to HP. If you have lets say a cam that makes its power from 4000-6500 RPM in a stock motor you are never gonna see the end of its power band, where as if you have a cam that makes its power from 2500-5000 RPM you will be right in the sweet spot when you call for it.

Instg8ter is offline  
 
post #4 of 19 (permalink) Old 04-23-2012, 03:45 PM Thread Starter
Jim
 
Jim's Avatar
 
Join Date: Oct 2008
Location: Anna, Texas
Posts: 125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well, I guess I better be careful. I gotta a 6000 RPM chip in right now..............
Bought the car the way it is in regards to internal parts so I am not sure what all internals have been done. I've added an MSD ignition, new MSD distributor, Blaster 2 Coil, New Edelbrock intake, New Holley 650 DP, Added Electric Fuel Pump. This thing runs great but I'm sure if I keep going the way I am I will break something.

I thought I should be able to Run 5200 to 5500 though.... Not really sure.
Jim is offline  
post #5 of 19 (permalink) Old 04-23-2012, 03:49 PM
 
Instg8ter's Avatar
 
Join Date: Sep 2010
Location: Near Detroit
Posts: 3,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
have you bounced it off the chip at 6000 yet?? you should be good at 5500 with a 400, smaller crank journal allows for better oiling than a 455 and the week point in Pontiacs is the rods not so much the crank. Only thing worse than a rev limiter set to low is blowing up your motor because it was set too high.... set it where you feel comfortable. I really don't think my 462 ever seen north of 5000 even when driving hard but i have a 2:56 rear end, if you have a smaller (3:55+) it will get there a lot quicker, its all a balancing act, thats why what works for Chevy's will not work well with Pontiacs, and why cam and rear end choices should be tailored to the way you plan on driving it most often. Picked up a perfectly good 455 cheap because the guy said it did not make any power, pulled out a huge lopey cam the previous owner had installed that made power to 6800 rpm and put in a .545 lift with smoother idle that topped out around 5000RPM and it screams on the street now and will still roast the tires whenever my foot sees fit up to 25MPH roll.


Last edited by Instg8ter; 04-23-2012 at 04:07 PM.
Instg8ter is offline  
post #6 of 19 (permalink) Old 04-23-2012, 04:02 PM Thread Starter
Jim
 
Jim's Avatar
 
Join Date: Oct 2008
Location: Anna, Texas
Posts: 125
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have bounced it off the 6k a couple of times. I am going to put a 5500 RPM chip in.
Jim is offline  
post #7 of 19 (permalink) Old 04-23-2012, 04:10 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,488
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 102 Post(s)
If it were me (and I drive a stock '67 400 in my convertible) I'd go no higher than the factory spec'd 5200 rpm redline. Not with a stock rotating assembly (rods)...
geeteeohguy is online now  
post #8 of 19 (permalink) Old 04-23-2012, 05:21 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,737
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
Quote:
Originally Posted by geeteeohguy View Post
If it were me (and I drive a stock '67 400 in my convertible) I'd go no higher than the factory spec'd 5200 rpm redline. Not with a stock rotating assembly (rods)...
What he said --- key point being, not with stock rods

Bear

BearGFR
Springtown, TEXAS
BearGFR is offline  
post #9 of 19 (permalink) Old 04-23-2012, 09:47 PM
 
jetstang's Avatar
 
Join Date: Nov 2008
Location: Niceville, FL
Posts: 3,376
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
The last owner new enough to set it up with a rev limiter, so maybe that tells you something about the setup and that is a safe limit for your motor. Do you know the cam specs, or what cam is installed? Pontiacs usually aren't RPM motors, but some are.

Burning rubber since 1982!!
My photobucket, lots of dif car pics.
http://s411.photobucket.com/home/jetstang
jetstang is offline  
post #10 of 19 (permalink) Old 04-23-2012, 09:59 PM
Former Moderator
 
68greengoat's Avatar
 
Join Date: Sep 2005
Location: Northern Wisconsin
Posts: 3,523
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by geeteeohguy View Post
If it were me (and I drive a stock '67 400 in my convertible) I'd go no higher than the factory spec'd 5200 rpm redline. Not with a stock rotating assembly (rods)...
Quote:
Originally Posted by BearGFR View Post
What he said --- key point being, not with stock rods

Bear
I'm with those guys. And like Instg8ter, my 462 hasn't seen north of 5000 either.....



SOLD.....
462ci, 4spd
Performer Intake, Mild Cam
Pertronix Ignitor III
Accel Super Coil, Accel 8.8mm Wires
68greengoat is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user 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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Gto top speed limiter removal? Pontiachris 2004-2006 GTO General Discussion 23 04-02-2010 03:15 AM
Rev Limiter NJG8GT Engine Discussions 1 02-03-2008 11:32 PM
Rev Limiter pickinfights Service, Maintenance and Technical Discussion 4 07-17-2007 01:35 AM
Rev Limiter oldgoat Racing and Kill Forum 13 05-07-2006 09:29 PM
speed limiter? fatgoat04 Service, Maintenance and Technical Discussion 8 10-31-2004 02:47 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