Pimpx and knock sensor
Thread Starter
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5th Wheeling
Joined: Sep 2023
Posts: 43
Likes: 1
Pimpx and knock sensor
So I'm realizing the stock knock sensor on my 1992 F-150 302 will not work with Pimpx...is this correct? The block I used on my rebuild is not drilled and tapped for the knock sensor so that will need to be done now before the engine is installed. Do I need it? Are there better aftermarket options that will work with Pimpx?
Hotshot
Joined: Jul 2020
Posts: 10,456
Likes: 2,630
From: Near Salt Lake City
Well, the knock sensor is just there in case you get a tank of **** poor gas
Then the timing gets reduced as you run the stuff through
Around here, crappy gas is so prevalent, people go up to the ski resorts in the winter and the processor will reduce the timing so much that the vehicle will not make it to the top of the mountain
On my suggestion
They shut the vehicle off and restart it, then make it the rest of the way up
Happens all the time
UT gas is 85 octane
They figure we can have **** poor gas due to our altitude and be okay
So, we get 85, 87 and 89
Around here knock sensors have use for street driving'
I know current I/M testers that swear Maverik gas will not pass I/M
Then the timing gets reduced as you run the stuff through
Around here, crappy gas is so prevalent, people go up to the ski resorts in the winter and the processor will reduce the timing so much that the vehicle will not make it to the top of the mountain
On my suggestion
They shut the vehicle off and restart it, then make it the rest of the way up
Happens all the time
UT gas is 85 octane
They figure we can have **** poor gas due to our altitude and be okay
So, we get 85, 87 and 89
Around here knock sensors have use for street driving'
I know current I/M testers that swear Maverik gas will not pass I/M
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FTE Chapter Leader
Joined: May 2006
Posts: 12,338
Likes: 1,314
From: Central Mississippi
The mega-squirt system based pimpx is configurable to use a knock sensor.
If they say a Ford sensor is not compatible, OK.
Ask what GM or other style they recommend.
If they say a Ford sensor is not compatible, OK.
Ask what GM or other style they recommend.
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Mountain Pass
Joined: Jan 2005
Posts: 116
Likes: 31
From: Langley B.C.
I have had no issues without knock control. I don’t think you’ll get huge gains by running timing to the ragged edge so just run a conservative table. The best of course is Dyno tuning it. I took a few degrees off the base table from Stinger and run 89 with no problem towing heavy. I had some interest in making one of those cheap headphone detonation listeners but never got to it.
Thread Starter
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5th Wheeling
Joined: Sep 2023
Posts: 43
Likes: 1
This truck is going to be used for on and off road normal truck things so no need to be aggressive on the table. However, I don't want to omit the sensor and find out later it was beneficial, especially if for whatever reason I had to go back to a stock ECU. Would mean pulling the engine to drill and tap the hole for it on my block. I'm leaning towards having it installed just in case, but if theres an aftermarket option that will work with Pimpx/megasquirt, it would be nice to gain the functionality. I have a post on Stinger's support forum asking about other compatible sensors as suggested above, still waiting to hear back.
Thread Starter
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5th Wheeling
Joined: Sep 2023
Posts: 43
Likes: 1
Reply from Stinger:
"You don't need a knock sensor. We have thousands of customers not running a knock sensor, many of them running 15+ psi of boost and some of them running over 30psi of boost and some making over 1000 hp, all without a knock sensor. You're running a little cam and no boost on a low compression engine which means you REALLY don't need a knock sensor"
"You don't need a knock sensor. We have thousands of customers not running a knock sensor, many of them running 15+ psi of boost and some of them running over 30psi of boost and some making over 1000 hp, all without a knock sensor. You're running a little cam and no boost on a low compression engine which means you REALLY don't need a knock sensor"
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The knock sensor programming in the Ford PCM doesn't have much effect, it certainly doesn't pull enough timing to prevent detonation which in examples I personally encountered only required a couple degrees of retard to quell. So yeah your motor is in no real danger from not utilizing one, no more than the millions of these motors that ran hundreds of thousands of miles without one.
Logistics Pro
Joined: Aug 2014
Posts: 3,558
Likes: 852
Run 87+, don't max timing, good to go without it.
Before you install the engine, drill and tap, then if you really want it, you can.