Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Race Car Tech
Reload this Page >

Everything you need to know about Trailing Ignition

Race Car Tech Discuss anything related to road racing and auto X.

Everything you need to know about Trailing Ignition

Old 12-30-02, 11:06 PM
  #1  
Senior Member
10 Year Member
Thread Starter
 
pistonsuk's Avatar
 
Join Date: Oct 2002
Location: Portland, OR
Posts: 685
Likes: 0
Received 0 Likes on 0 Posts
Everything you need to know about Trailing Ignition

i just wanted someone to explain what the trends are regaurding trailing ignition.
For example: generaly the more advanced your leading timing is the more power you will make but the trade off is the increased threat of detination.
what is the story with trailing? is a wide split good? or just the opposite? should the split vary with boost pressure? how does it affect torque and power? etc...
thanks,
justin
pistonsuk is offline  
Old 12-31-02, 10:20 PM
  #2  
aheadau
10 Year Member
 
Join Date: Dec 2002
Location: St. Louis, Mo.
Posts: 411
Likes: 0
Received 0 Likes on 0 Posts
In the old days it was common to advance the leading by ~5 deg., and shorten the "split to 10 ~ 15 deg.
This would provide a little extra power at high rpm.
I will defer the boost question.
racermike is offline  
Old 01-02-03, 07:13 PM
  #3  
I have more fun than you.
5 Year Member
 
DavidDeco's Avatar
 
Join Date: May 2002
Location: Sand Key/Clearwater Beach, Florida
Posts: 1,078
Likes: 0
Received 0 Likes on 0 Posts
Re: Everything you need to know about Trailing Ignition

Originally posted by pistonsuk
i just wanted someone to explain what the trends are regaurding trailing ignition.
For example: generaly the more advanced your leading timing is the more power you will make but the trade off is the increased threat of detination.
what is the story with trailing? is a wide split good? or just the opposite? should the split vary with boost pressure? how does it affect torque and power? etc...
thanks,
justin
There's a thread around here somewhere that talks about the results going from 12-10 degrees and then 10-8 degress split on the single turbo forum. Do a search by this topic or Dyno Sheets. I think that's when I read it.

In general I see that people report increases in HP with reduced split up to a point. A few say they lost HP going less than like 10 but that doesn't seem to make sense.

Some advocate 0 split if you have the guts. Just remember that the Trailing should never fire before the Leading....that could be very bad from what I understand.
DavidDeco is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dona1326cosprings7
1st Generation Specific (1979-1985)
4
10-29-15 06:47 AM
GKW
1st Generation Specific (1979-1985)
5
09-28-15 04:34 PM
subeone
General Rotary Tech Support
0
09-24-15 09:58 PM


Thread Tools
Search this Thread
Quick Reply: Everything you need to know about Trailing Ignition


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: