Hellbert

can detonation get loud enough to hear over the engine without a set of cans...? it never really occurred to me that the "rattle" i keep hearing may be detonation....? and how do you tune it out if the car is already running rich if that is infact what it is

sorry to kinda steal ur thread man

HiProfile

Detonation, at the most simple level, is caused by too high of cylinder pressures resulting in an erratic, spontaneous conbustion starting elsewhere than the spark plug.

To decrease max cylinder pressure, you decrease compression, boost, or timing advance. It can also be related to heat of the combustion, as the heat from the spart moves as infrared heat. The actual flame front moves a few thousand kilometers per hour (highly compressed atoms), but infrared light moves at 1,079,252,848.8 km/h. This is reduced with a better intercooler, a more efficient turbo (or turning boost down to a more efficient level), or simply less timing.

Since the pre-ignition form of detonation can happen before the timing event, it can be pushing against the still-rising piston, reducing power. You can usually make MORE power by tuning out detonation

one2many

pre ignition and detonation are two TOTALLY different things.


if detonation is bad enough, you will be able to hear it with a "naked" ear.

ifly87

Pre-ignition is the actual ignition event happening before the spark plug fires, even with a det-can you prolly cannot hear pre-ignition.

Detonation is the uncontrolled burning of the fuel/air charge causing a rapid "explosion" and extreme cyl. pressures rather than a nice controlled burn and even cyl. pressure. Detonation can be caused by pre-ignition but pre-ignition will not always result in detonation.

I made one of the electronic versions, i'll try and get a pic up, I havent got to play with it yet though on a car so I cant say how it works.

one2many

i made on of those too. it wasnt bad at idle but at wot it was crazy loud. no way in hell to distinguish different sounds.


i used that radio shack amplifier.

ifly87

I used their whisperer 2000 or whatever they used, I got it off ebay for like $7. with that, dean connector, clamp, free cord it set me back like $15, not including the headphones which I bought a nice set, they were like $30 or somthing.

StinkyFeet

my creation :


sorry for the crappy cellphone pics. My camera died.

I used an amped computer speaker I had laying around, a microphone out of a wired hands-free for a cell phone... and a little bit of inginuety... havn't tested it in the car yet, but it works great listening to noises around the room.

Features:
Volume control
Headphone Jack
Powered Speaker
alligator clip
USB powerd
A+ ghettoness

Parts/tools:
Amped Computer Speakers
mini-microphone (from headset, or hands free device)
9v battery + battery clip (from radio-shack)
Alligator Clip
solder
heat shrink tubing
optional cigerette-lighter plug from radioshack (mines usb powered, so im just gonna run it off laptop)

Overall Cost: 0-$10

How to build:
cut the jack off your computer speaker (the little 1/4 inch dealio that plugs into computer)
strip the wires back
twist the two sheilded wires together... (so you combine mono/stereo)
lengthen wire (I used an rca cable, as it is basically identical inside, minus the extra stereo wire

tear apart your hands-free device like its been naughty on christmas...
find the little speaker inside
desolder it
solder one end to "red" battery clip lead, and other to bare wire on computer speaker
solder the sheilded/coated wire on computer speaker to the "black/negative" battery clip lead
hot-glue or crimp your mic to your alligator clip
heat shrink everything to tidy up, and you're done.

lemme know what you think.

lkailburn

nice to see others trying to build their own setups.
hope my thread helps you guys

-Luke