Who Built your Motor and are you satisfied?
#35
11-25-2005 | 11:06 PM
Senior Member
Joined: Mar 2002
Posts: 4,867
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From: NH
Originally Posted by 03F15054FX4
Wouldnt you guys save a ton of money on engines if you had knock sensors installed?
In other words all they measure or sense is a noise frequency/vibration. They can not distinguish what produced that frequency/vibration nor can they distinguish where that frequency/vibration originated from. One way to test knock sensors, while the motor is running, is to monitor the timing and then tap on the block with a hammer. If the knock sensor is functioning correctly you would see the timing being retarded.
Today’s knock sensors are as stupid as they were when they first came out. However today, with the assistance of the PCM and crank location sensor, the two sensors inputs can usually determine which cylinder or cylinders are “knocking” and thus retard timing when those cylinder/s fire.
The supercharger basically makes the knock sensors deaf…
#36
11-25-2005 | 11:28 PM
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Joined: Sep 2003
Posts: 1,412
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From: Florida
Originally Posted by l-menace
Any Vt Engines?
It would have been really helpful if we wern't across the US away from each other.
#37
11-26-2005 | 12:37 AM
Senior Member
Joined: May 2003
Posts: 443
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From: ID
Originally Posted by 01 XLT Sport
You can’t use knock sensors with the supercharger due to vibration of the supercharger, or more specifically, the noise frequency/vibration. Knock sensors are stupid electronic noise frequency/vibration devices.
In other words all they measure or sense is a noise frequency/vibration. They can not distinguish what produced that frequency/vibration nor can they distinguish where that frequency/vibration originated from. One way to test knock sensors, while the motor is running, is to monitor the timing and then tap on the block with a hammer. If the knock sensor is functioning correctly you would see the timing being retarded.
Today’s knock sensors are as stupid as they were when they first came out. However today, with the assistance of the PCM and crank location sensor, the two sensors inputs can usually determine which cylinder or cylinders are “knocking” and thus retard timing when those cylinder/s fire.
The supercharger basically makes the knock sensors deaf…
In other words all they measure or sense is a noise frequency/vibration. They can not distinguish what produced that frequency/vibration nor can they distinguish where that frequency/vibration originated from. One way to test knock sensors, while the motor is running, is to monitor the timing and then tap on the block with a hammer. If the knock sensor is functioning correctly you would see the timing being retarded.
Today’s knock sensors are as stupid as they were when they first came out. However today, with the assistance of the PCM and crank location sensor, the two sensors inputs can usually determine which cylinder or cylinders are “knocking” and thus retard timing when those cylinder/s fire.
The supercharger basically makes the knock sensors deaf…
#38
11-26-2005 | 10:27 AM
Senior Member
Joined: Mar 2002
Posts: 4,867
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From: NH
Originally Posted by fast1
Don't quite a few supercharged GM's use knock sensors?
Something that is interesting to think about is the fact that the speeds at which the supercharger is spun will create different vibration signals, or frequency signals, of which a knock sensor measures.
If you spin the supercharger at a different speed by modifying pulleys, and/or adding a different supercharger then you would, or could, change the frequency range, or vibration. Therefore, and dependant on how much of a change you made, you might be able to get the knock sensors to function correctly. It would be interesting to see someone experiment with that idea.
#39
11-26-2005 | 10:54 AM
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Joined: Sep 2003
Posts: 1,412
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From: Florida
Originally Posted by 01 XLT Sport
They may and I was only speaking to the Lightning. Ford was not able to get them to function correctly due to the vibration of the supercharger. I don’t think Ford is the only one to every have problems with them but I could not tell you who has and has not been able to make them function correctly and on what applications.
Something that is interesting to think about is the fact that the speeds at which the supercharger is spun will create different vibration signals, or frequency signals, of which a knock sensor measures.
If you spin the supercharger at a different speed by modifying pulleys, and/or adding a different supercharger then you would, or could, change the frequency range, or vibration. Therefore, and dependant on how much of a change you made, you might be able to get the knock sensors to function correctly. It would be interesting to see someone experiment with that idea.
Something that is interesting to think about is the fact that the speeds at which the supercharger is spun will create different vibration signals, or frequency signals, of which a knock sensor measures.
If you spin the supercharger at a different speed by modifying pulleys, and/or adding a different supercharger then you would, or could, change the frequency range, or vibration. Therefore, and dependant on how much of a change you made, you might be able to get the knock sensors to function correctly. It would be interesting to see someone experiment with that idea.
#40
11-26-2005 | 11:18 AM
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Joined: Aug 2003
Posts: 908
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From: Alabama
Originally Posted by l-menace
Any Vt Engines?
But....I removed my heads after toasting a valve awhile back and saw some scarring on a couple of cylinder walls (from me killing plugs) so I decided to pull the motor.
I should be getting it back from the machine shop in another week or so, then I plan on building it myself this time.
I wanted to make sure everything is perfect for the Turbo install
#42
11-26-2005 | 11:31 AM
Member
Joined: Jul 2003
Posts: 91
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From: Arizona
Being the new owner of this truck, I second that - Dante's Modular Performance all the way
Originally Posted by camcojb
Dante's Modular Performance; VERY happy with it, runs great, uses no oil, no smoking, no noise.
Jody
Jody
#43
11-26-2005 | 11:52 AM
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Joined: Sep 2001
Posts: 423
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From: St. Louis
My first motor was done By Tommy @ Outrageous Performance. What a ***** motor that was( see my post of what Sal found). My new motor is a PSP long block. Don't have it back yet, but it's going to run really strong 
#45
11-27-2005 | 11:49 AM
Thread Starter
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Senior Member
Joined: Aug 2001
Posts: 3,519
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From: Greater Boston
post again
We have heard lots of great things about the JDM motor program out there, but with all the other vendors and tuners out there, you don't here a ton about how their motor programs are going. Post who did your motor and how things are going.
We have already learned about Daunte's Perfomance and the great things coming out of there.....as recently as the new no nos et record!