2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by:

What does detonation sound like?

Thread Tools
 
Search this Thread
 
Old 10-05-02, 11:08 PM
  #1  
Clogged cat

Thread Starter
iTrader: (3)
 
koukifc3s's Avatar
 
Join Date: Sep 2002
Location: Orange County, CA
Posts: 2,000
Likes: 0
Received 0 Likes on 0 Posts
What does detonation sound like?

Hey, when I accelerate I hear a funny sound from the car, like some little pops.
Now I have my S-AFC set from -9% to -14% in the Low Throttle position. When I brought everything back to 0% the sound dissappeared.
Could that be detonation? I've got an n/a so I dunno!

Thanks!
Old 10-05-02, 11:10 PM
  #2  
SOLD THE RX-7!

 
Scott 89t2's Avatar
 
Join Date: Mar 2001
Location: Vancouver, BC, Canada
Posts: 7,451
Likes: 0
Received 0 Likes on 0 Posts
wow that's pretty low!!... do you ahve bigger primary injectors?

it very well could have be detonation. it's usaly a lot of "pinging" noises in a row. kinda like popcorn.
Old 10-05-02, 11:16 PM
  #3  
Clogged cat

Thread Starter
iTrader: (3)
 
koukifc3s's Avatar
 
Join Date: Sep 2002
Location: Orange County, CA
Posts: 2,000
Likes: 0
Received 0 Likes on 0 Posts
Huh oh, I think that was that!
Goddamn A/F gauge, it was showing rich!
Oh well, now I'm just gonna save money and go on a dyno.
thanks!
Old 10-05-02, 11:23 PM
  #4  
Daily Domestic Killer

 
BlackRx7's Avatar
 
Join Date: Mar 2001
Location: San Antonio, Tx, USA
Posts: 2,425
Likes: 0
Received 0 Likes on 0 Posts
very wierd, just wonder but do you have a new S-AFC?
Old 10-06-02, 01:50 AM
  #5  
Clogged cat

Thread Starter
iTrader: (3)
 
koukifc3s's Avatar
 
Join Date: Sep 2002
Location: Orange County, CA
Posts: 2,000
Likes: 0
Received 0 Likes on 0 Posts
yeah I got the 2nd gen one. I'm still running stock injectors too.
Let's hope I didn't mess up anything!
Old 10-06-02, 06:42 AM
  #6  
OC_
I'm bastardizing my car!

 
OC_'s Avatar
 
Join Date: Sep 2002
Location: Naperville, IL.
Posts: 1,258
Likes: 0
Received 0 Likes on 0 Posts
does it happen on the throtle or off?
Old 10-06-02, 09:42 AM
  #7  
Engine, Not Motor

iTrader: (1)
 
Aaron Cake's Avatar
 
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 110 Likes on 93 Posts
There are two kinds of detonation, mild and severe.

Severe detonation is loud, and very noticable. It sounds like a loud "*****!".

Mild detonation is a little more difficult to detect. It is often described as what sounds like popcorn popping.

You're S-AFC settings are way too low, and you are probably detonating the engine. Best increase your fuel before you damage something. BTW, A/F guages are NOT a reliable way to tune the car. I have shown full rich on my guage, yet have been clearly detonating the engine...
Old 10-06-02, 10:16 AM
  #8  
Clogged cat

Thread Starter
iTrader: (3)
 
koukifc3s's Avatar
 
Join Date: Sep 2002
Location: Orange County, CA
Posts: 2,000
Likes: 0
Received 0 Likes on 0 Posts
It happened when I press the throttle at about 30%. At WOT I had the setting a little lower so thank God I didn't blow my engine!
Old 10-06-02, 12:59 PM
  #9  
infini guru

 
MtnRacer's Avatar
 
Join Date: Nov 2001
Location: Sunnyvale, CA
Posts: 1,183
Likes: 0
Received 0 Likes on 0 Posts
So is afterburn mild detonation then? I thought it was unspent fuel hitting hot exhaust pipes. It definitely sounds like popcorn though...

Steve
Old 10-06-02, 12:59 PM
  #10  
infini guru

 
MtnRacer's Avatar
 
Join Date: Nov 2001
Location: Sunnyvale, CA
Posts: 1,183
Likes: 0
Received 0 Likes on 0 Posts
So is afterburn mild detonation then? I thought it was unspent fuel hitting hot exhaust pipes. It definitely sounds like popcorn though...

Steve
Old 10-07-02, 04:10 PM
  #11  
Lives on the Forum

 
RETed's Avatar
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Likes: 0
Received 17 Likes on 16 Posts
Yes, it sounds the same.


-Ted
Old 10-07-02, 05:09 PM
  #12  
HAILERS

 
HAILERS's Avatar
 
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 22 Likes on 20 Posts
Start your lawnmower up and spray starter fluid in its intake at high throttle. That is pinging, knock whatever. With just a little luck you will destroy the engine and not have to cut the lawn the rest of the year.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Rbkouki
V-8 Powered RX-7's
0
09-29-15 08:54 PM
baix2
Power FC Forum
1
09-28-15 09:40 AM



Quick Reply: What does detonation sound like?



All times are GMT -5. The time now is 05:34 AM.