Compression, Octane, 351W
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
I purchased a Tweecer a couple years ago. Although I believe it is the best answer for me, it is a huge learning curve. Most of the stuff I learned was with reading, researching, and trial and error. The learning path is still on going. I'm not looking for the time I swap my stock 351W to a built 408.
If you are not good with finding your own answers and like to have your hand held, you might want to go a different route.
If you are not good with finding your own answers and like to have your hand held, you might want to go a different route.
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
Any idea what fuel pressure your running, I kept, stock cam, used 1.7's,rollers, and ported intake, stock 19#'s, and raised fuel pressure to 36# at idle, was 32#, and runs rich, 10.5-11.3, but it can, roast the goodyear mud tires at any moment. 183hp @ 3,900rpm, 293tq @ 2,900rpm,
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
So i just threw all the numbers through a compression calculator, I had previously calculated them by hand, and my static is 10.15:1 and dynamic is 8.92:1.
To clarify it isn't pinging or missing on the low octane right now, so I am going to increase my base ignition timing. On current timing I gave it some hard acceleration and there wasn't a miss, I don't think I would be able to hear a ping over the exhaust on hard acceleration.
To clarify it isn't pinging or missing on the low octane right now, so I am going to increase my base ignition timing. On current timing I gave it some hard acceleration and there wasn't a miss, I don't think I would be able to hear a ping over the exhaust on hard acceleration.
Cargo Master
Joined: Mar 2007
Posts: 2,854
Likes: 1,035
Get a wideband.
Cargo Master
Joined: Oct 2020
Posts: 2,691
Likes: 789
Thanks for the info, I know the cam is best for the lower rpms. I didn't advance it, I just used the indents on the timing gears to throw it in. I am still pretty new to all this tuning and performance stuff, so I don't know if I am fully grasping what you're saying I do apologize
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
Alright, I did some hard accel today and I got it to miss once just felt like a little blip for a split second and then she was a ok after that, I am running low of fuel so I am planning on putting 91 in it next fill up.
I got some decent burns on my hands from a welding incident so I haven't been able to get some physical work done on the truck. But I did look into some A/F ratio gauges and I am planning on getting a wide band, I was just shopping around to find one I liked. I am planning on running it all the time and just sticking it in the A pillar so its out of the way. I am planning on doing a lot of reading on engine performance so I can get a foothold, it looks like I am bound to not do physical work on my truck for a little bit until my burns heal.
Thank y'all for being patient with me. I really do appreciate the help.
I got some decent burns on my hands from a welding incident so I haven't been able to get some physical work done on the truck. But I did look into some A/F ratio gauges and I am planning on getting a wide band, I was just shopping around to find one I liked. I am planning on running it all the time and just sticking it in the A pillar so its out of the way. I am planning on doing a lot of reading on engine performance so I can get a foothold, it looks like I am bound to not do physical work on my truck for a little bit until my burns heal.
Thank y'all for being patient with me. I really do appreciate the help.
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
Well, my engine pings on start up for a second and then goes away, never thought it was pinging and thought it was something rattling around, been doing that for almost 6 months so I hope there isn't any damage, I am going to get some octane booster and dump it in until I can fill up with 91.
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Cargo Master
Joined: Mar 2007
Posts: 2,854
Likes: 1,035
Are you certain it's pinging? Pinging on start up sounds weird to me. I don't want to say that it can't happen, but it's hard to think it could.
Pinging damage is usually because you under a lot of load and with the additional load and wrong ignition timing, damage can occur.
Pinging damage is usually because you under a lot of load and with the additional load and wrong ignition timing, damage can occur.
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
Are you certain it's pinging? Pinging on start up sounds weird to me. I don't want to say that it can't happen, but it's hard to think it could.
Pinging damage is usually because you under a lot of load and with the additional load and wrong ignition timing, damage can occur.
Pinging damage is usually because you under a lot of load and with the additional load and wrong ignition timing, damage can occur.
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
I will get my bore scope in there to make sure there isn't any damage. I will also be changing the oil soon so I will look for any glitter in the oil.
Thread Starter
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Tuned
Joined: Apr 2023
Posts: 468
Likes: 67
From: Near SLC Utah
Well, whatever that noise is, it isn't pinging, my guess is maybe some lifter noise. Misdiagnosis on my end. The oil looked like plain old used motor oil, the noise is still there, I am going to try some marvel mystery oil for the noise. I did put some lucas ZDDP in for the flat tappet camshaft.
I put 91 octane in it, so far hasn't pinged or missed. I did advance the ignition timing but now my motor is stalling, Ive been chasing this issue for the past week, pretty sure the motorcraft TFI module I got was bad, but unrelated to this forum.
I found a A/F gauge I like and will get it on order tonight, I am also planning on getting my fuel gauge on it and see what its reading, I did some reading through my notes and the new pumps were putting out around 33 PSI with the FPR plugged in when I installed them, its a little low.
Sorry I haven't updated just been chasing some more pressing issues.
I put 91 octane in it, so far hasn't pinged or missed. I did advance the ignition timing but now my motor is stalling, Ive been chasing this issue for the past week, pretty sure the motorcraft TFI module I got was bad, but unrelated to this forum.
I found a A/F gauge I like and will get it on order tonight, I am also planning on getting my fuel gauge on it and see what its reading, I did some reading through my notes and the new pumps were putting out around 33 PSI with the FPR plugged in when I installed them, its a little low.
Sorry I haven't updated just been chasing some more pressing issues.