Heading in right direction?

I was curious on what y’all thought about switching from batch fire to sequential injection. Is it worth it? I’m about to do my injectors and I was considering switching while I’m there, all it takes is to change a couple pins on the pxs and rewire the injector harness right?
 
Mavguy92 said:
I was curious on what y’all thought about switching from batch fire to sequential injection. Is it worth it? I’m about to do my injectors and I was considering switching while I’m there, all it takes is to change a couple pins on the pxs and rewire the injector harness right?
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When I first got my truck running I was running batch fire (inadvertently). When I fixed my issue it then ran sequential and I can definitely tell a difference in idle quality. If you're tying to squeeze every last bit of MPG and emissions out then sequential is best. WOT there's arguably no difference.
 
Raymond_B said:
When I first got my truck running I was running batch fire (inadvertently). When I fixed my issue it then ran sequential and I can definitely tell a difference in idle quality. If you're tying to squeeze every last bit of MPG and emissions out then sequential is best. WOT there's arguably no difference.
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Ok thank you sir. So if I wanted to make the change besides the pin out on the computer I would have to rewire my injector harness right?


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The basis in the pin-out on the ECU. I originally used a Mustang injector harness (the half that only does the injectors) to handle the sequential part, but since the PxS uses none of the smog stuff, I repurposed those leads, and added a few more, to the square engine harness and ran all the injector leads through that.
 
I’ve got a cam question, been kicking around since I went to the pxs stepping the cam. My truck is pretty mild with bolt ons ,long tubes ,cold air ,1.7 rockers, throttle body, navigator converter, and I want to keep the factory intake, and cold a/c. I want to drive it 7 days a week in central Florida. The cam I have now is just around a .488 lift, I do have a .531 intake .560 exhaust hydraulic tappet cam laying around, do you guys think that would be too much for it?


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Mavguy92 said:
I’ve got a cam question, been kicking around since I went to the pxs stepping the cam. My truck is pretty mild with bolt ons ,long tubes ,cold air ,1.7 rockers, throttle body, navigator converter, and I want to keep the factory intake, and cold a/c. I want to drive it 7 days a week in central Florida. The cam I have now is just around a .488 lift, I do have a .531 intake .560 exhaust hydraulic tappet cam laying around, do you guys think that would be too much for it?


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Click to expand...
If you got pimpxshift then you probably can't find a cam "too big" that won't work. Lift is just one part.. the duration and lobe separation has more to do with driveability. Only thing I would be worried about is 1: matching up cam to current mods and 2: making sure cam pulls enough vacuum for your brakes to function well.

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Mavguy92 said:
I’ve got a cam question, been kicking around since I went to the pxs stepping the cam. My truck is pretty mild with bolt ons ,long tubes ,cold air ,1.7 rockers, throttle body, navigator converter, and I want to keep the factory intake, and cold a/c. I want to drive it 7 days a week in central Florida. The cam I have now is just around a .488 lift, I do have a .531 intake .560 exhaust hydraulic tappet cam laying around, do you guys think that would be too much for it?


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I have a TFS stage 2 in mine. Don’t think it would be good under 2800-3000 converter. Other than that, idles nice and choppy, vacuum is good 12” at 850 idle.


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slow94 said:
If you got pimpxshift then you probably can't find a cam "too big" that won't work. Lift is just one part.. the duration and lobe separation has more to do with driveability. Only thing I would be worried about is 1: matching up cam to current mods and 2: making sure cam pulls enough vacuum for your brakes to function well.

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Ok I appreciate the help, I didn’t pull the cam card on the spare I got yet, will the vacuum be on the cam card or is that something I will have to maybe call and talk to comp you think?


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ASAP said:
I have a TFS stage 2 in mine. Don’t think it would be good under 2800-3000 converter. Other than that, idles nice and choppy, vacuum is good 12” at 850 idle.


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I got a buddy with that cam in a fox body I love the way that cam sounds, I don’t know if I have the converter to back that cam up or not mine is pry realistically like 2400 stall maybe, I have a good dozen cams laying around I just need to do some research on all the cam cards I think. I want a choppy idle fun truck at the strip but still a 7 day a week cruiser so I know that can be a fine line lol.


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Mavguy92 said:
I got a buddy with that cam in a fox body I love the way that cam sounds, I don’t know if I have the converter to back that cam up or not mine is pry realistically like 2400 stall maybe, I have a good dozen cams laying around I just need to do some research on all the cam cards I think. I want a choppy idle fun truck at the strip but still a 7 day a week cruiser so I know that can be a fine line lol.


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I gottya man. I had a comp 268 magnum in another 351 in a sleeper 91 f150 that I loved. Had a 2200 converter with 410’s like the Lightning with an AOD. Sounded great and pulled to 5900 rpm with a edelbrock RPM
air gap intake and RPM heads.
6b29abebda7130f314ccdb5327b994f6.jpg


820915d8aabe253933a61313fba84b45.jpg



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ASAP said:
I gottya man. I had a comp 268 magnum in another 351 in a sleeper 91 f150 that I loved. Had a 2200 converter with 410’s like the Lightning with an AOD. Sounded great and pulled to 5900 rpm with a edelbrock RPM
air gap intake and RPM heads.
6b29abebda7130f314ccdb5327b994f6.jpg


820915d8aabe253933a61313fba84b45.jpg



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I like that truck, and that cam might be an option, I appreciate the advice.


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I went stage 1 and matching valve springs in 2013. ran it that way for quite a while. Sounds nice. performs fairly well. I still run it but im sure its not a good option for me now.
 
scott sanderson said:
F4TE will be the # above your starter which will designate if it’s a roller block.
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Ok I will check that, I had the intake off a few years ago and I think the block has the provisions for the spider tray but it didn’t have the tray or anything and it was flat tappet, I wouldn’t be against doing a roller conversion with the retro fit lifters if I have too.


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FlatOut said:
I went stage 1 and matching valve springs in 2013. ran it that way for quite a while. Sounds nice. performs fairly well. I still run it but im sure its not a good option for me now.
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I checked out that stage 1 it seems popular I like it, it seems to work well with lightly modded small blocks, I also have a comp .513 hydraulic roller cam very similar to like an f-cam that I think might be more up my alley than the larger .531 lift I have, also because I don’t think I have enough converter to back up the larger cam.


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Mavguy92 said:
I checked out that stage 1 it seems popular I like it, it seems to work well with lightly modded small blocks, I also have a comp .513 hydraulic roller cam very similar to like an f-cam that I think might be more up my alley than the larger .531 lift I have, also because I don’t think I have enough converter to back up the larger cam.


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IMO, the f cam or similar will need a decent converter to get you ramped in to the power band faster not due to the lift but the duration.


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