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l98 vs lb9 knock sensors?

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Old Nov 2, 2003 | 10:34 AM
  #1  
88 350 tpi formula's Avatar
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From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
l98 vs lb9 knock sensors?

I wanted to know who knows what the differance is betweeen the two? I know they show up as two differant part numbers and you should swap them when you do the tpi 305-tpi350 swap. I am really confused because it looks like everyone with a 350 tpi 5-speed or 6-speed is using the 305- t-5 bin as a starting point and adjusting fuel and spark.

The way I see it the 305 knock sensor should be used then right?

or is the 350 one less sensitive due to the larger bore of the eng.?

I have done searches but, no one really says what the differance is. just to use the 350 one due to it having a differant knock setup. this is for a 88 in mind but, should hold true for all the MAF setups
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Old Nov 2, 2003 | 06:20 PM
  #2  
3.8TransAM's Avatar
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From: Schererville , IN
Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
Transmission: all OD
Axle/Gears: Always the good ones
yes there different

see the dealer

seperate listings for respective engine sizes
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Old Nov 2, 2003 | 08:17 PM
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88 350 tpi formula's Avatar
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From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
I know that but, I was asking what made them differant. vader already told me though
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Old Nov 3, 2003 | 11:34 PM
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From: Seattle, Washington
Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
So what is different?

Is it that the cyl are larger in bore and create a different freq of knock....


Or do I have no clue?
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Old Nov 4, 2003 | 10:46 PM
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From: In reality
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Originally posted by Twilightoptics
So what is different?
Is it that the cyl are larger in bore and create a different freq of knock....
Yes, there is a slight difference in the frequency resulting from the difference in bore sizes.

And there are several different series of sensors, having different internal resistances.
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