THe NAC Lots-O-BFG KO2 Thread

[rweaver138]

Re: THe NAC Lots-O-Post Thread

dude, i know you live in the woods, but big-box store open boxes are the way to go. modern tvs dont wear out for shit, you can get returns and display models for 40 to 50% off easy. the plasma in my living room was a display model my rents paid under 400, originally 750. my plasma i paid 350 or so, originally 700... both panasonic vieras. bought my mom a 32" insignia lcd for 145 orig 250. all best buy open box or returns. wait til the week after christmas, best time to buy ANYTHING electronics. returns are the shit.

hmmmmm never thought of that. i'll have to check that out, need a tv for the mantown i'm planning in my basement.

 

[kastein]

Re: THe NAC Lots-O-Post Thread

fill it with engine parts and transmissions and burnt in half track bars instead

okay

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

Gonna have to overnight some 25W resistors for my injectors so I don't cook my ECU.

 

[ROBZ95Xj]

Re: THe NAC Lots-O-Post Thread

Gonna have to overnight some 25W resistors for my injectors so I don't cook my ECU.

Your saying this like we give a shit

Ps anyone game to wheel mabell one of the weekends after rocktoberfest? I really wanna save for 42s but I also really wanna wheel

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

Your saying this like we give a shit

Ps anyone game to wheel mabell one of the weekends after rocktoberfest? I really wanna save for 42s but I also really wanna wheel

No one else is doing any talking.

I don't make the drive out for just MaBelle. It's just not worth it to me.

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

Gonna have to overnight some 25W resistors for my injectors so I don't cook my ECU.

Not a RadioShack item, or at least a hobby shop/electronics kinda thing?

Where do those go in the injector wiring? I'm used to seeing injectors with +12V constant and the ECU supplying a ground to make them fire.

 

[ktm racer 419]

Re: THe NAC Lots-O-Post Thread

I like mabell. Id like to go. We can race.

Mike at ttf said he would have to get back to me on if he can weld up my doubler for me. If not who can do it and not rape me? Im not wheeling again til my driveline is awesome.

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

Are you gonna be using both injector banks or just one?

Usually with the batch fire injectors it's set to actuate the injectors at/near the cylinders that are nearing the intake stroke...with the TBI I guess you can't really go by that. Just gonna have it alternate jets in each throttle body?

I was actually thinking about that the other day.

The six pack is a dual plane with the holley two barrel pattern. Each bore on each throttle body is going to a different plane (i.e. if you look at it top down, the left bore goes to the top plane, right bore goes to the lower plane on each).

I was thinking of getting the cylinders they flow to, and thinking of how to get the injectors to flow to the cylinders that are near intake stroke by using banks 1 and 2 (1 for upper plane 2 for lower plane). If I had a single plane intake, I would just use one bank, but then I would lose the advantage of the dual plane (power from 1500-6500).

However, I could easily avoid all that by opening up the wall between the bores, but that's the lazy way.

I didn't know that Mopar stole Chevy's firing order.

From the sketch I just made it look like it draws from each plane alternately throughout the firing order. Which makes sense I guess.

In your case then, does the MS actuate an injector for each ignition stroke? If so that'd be pretty easy, just alternately fire banks 1 and 2.

If not, and it's once each per bank per revolution, that'll be a bit more interesting to figure out as the fuel distribution isn't gonna be anywhere near even. You can get away with it on a multiport injection system as the fuel is introduced near the cylinders that need it, but with cylinders 2,3,5, and 8 drawing off one plane and 1,4,6,7 drawing off the other, that 3-5 and 4-6 sequence is gonna XXXX the other cylinders outta some fuel if it's only batch firing once a revolution...

I think it's the latter.

I believe it uses the coil to fire the injectors, and powers the injectors every other time the coil sparks.

However, I'm pretty sure you can tune the number of injections per engine cycle.

At least I vaguely remember you can.

I haven't read the manual in a while.

How's this going...staying with the same plan still?

 

[kastein]

Re: THe NAC Lots-O-Post Thread

25w, how many ohms? Is the injector current draw just too high for the MS or are you worried about inductive kickback/back-EMF issues?

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

It stinks like tech in here.

 

[cmelo]

Re: THe NAC Lots-O-Post Thread

So I learned to tig weld last night

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

Not a RadioShack item, or at least a hobby shop/electronics kinda thing?

Where do those go in the injector wiring? I'm used to seeing injectors with +12V constant and the ECU supplying a ground to make them fire.

Low Z injectors (GM TBI units). Running too many on one driver shoots the current draw to the moon. Supposedly they have a flyback circuit built in to handle it, but I still don't feel comfortable with it. Rather just solder in a few resistors.

I could get an inline axial one from You-do-it electronics on my way home, but I like some of the mounted ones I've seen online. I can mount the 6 of them underneath the dash and then out to each injector. Just makes it easier/cleaner.

I like mabell. Id like to go. We can race.

Mike at ttf said he would have to get back to me on if he can weld up my doubler for me. If not who can do it and not rape me? Im not wheeling again til my driveline is awesome.

What's special about your doubler? I can't remember. Is your welder just not powerful enough to do it?

How's this going...staying with the same plan still?

So far yes. Not sure that I really had a plan to begin with :laugh:

Bank 1 upper plane, Bank 2 lower plane.

You can simulataneously/alternately fire them as many times as you want per cycle of the engine (720º of revolution). Obviously this reduces the amount of fuel that needs to be injected and increases the amount of time the injectors are open (duty cycle).

My plan is to alternately fire them 4 times per cycle and see how that works. (2 squirts upper, 2 squirts lower).

This could all go out the window as my engine could just "like" some other setup.

I'm planning on getting it idling/running decent Thursday night with a baseline tune and really tuning it on Sunday somewhere. Saturday I need to build the air intake/cleaner setup.

 

[cmelo]

Re: THe NAC Lots-O-Post Thread

****ing inductive kickback, I hate that shit.

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

4 times alternately per cycle sounds kind of sketchy...just thinking it through:

- Fire bank 1
- Cylinder 1 draws from intake plane 1
- Cylinder 8 draws from intake plane 2
- Fire bank 2
- Cylinder 4 draws from intake plane 1
- Cylinder 3 draws from intake plane 2

And so on. Just seems like the pulses would be off, and you wind up having 2 intake strokes on each plane for 1 fuel burst. Maybe fire 4 times jointly per cycle?

Either way, worst case is you lean it out and burn the valves/pistons...just throw some more free shit in there and get back at it, right?

Tuning via wideband or...?

 

[MoparManiac]

Re: THe NAC Lots-O-Post Thread

I'm not worried about it.

Like I said I don't have a set plan yet. I'm just going to dick with the injection events until it idles decent and I can set a baseline.

Then go out on Sunday and hammer down with the wideband O2 setup (my friend is letting me borrow) and get the thing totally dialed in.

 

[RCman]

Re: THe NAC Lots-O-Post Thread

$3.39/gal diesel this morning and even at that "deal" it is way to high.

 

[cmelo]

Re: THe NAC Lots-O-Post Thread

IDIOT

 

[ktm racer 419]

Re: THe NAC Lots-O-Post Thread

What's special about your doubler? I can't remember. Is your welder just not powerful enough to do it?

The aluminum part. I can weld the clocking adapter just fine.

 

[vetteboy]

Re: THe NAC Lots-O-Post Thread

I'm not worried about it.

Like I said I don't have a set plan yet. I'm just going to dick with the injection events until it idles decent and I can set a baseline.

Then go out on Sunday and hammer down with the wideband O2 setup (my friend is letting me borrow) and get the thing totally dialed in.

Cool. I'm 50/50 looking forward to that part of my project/dreading it. I get to deal with fun stuff like at ~4k RPM (even that threshold is tunable depending on everything else going on around the motor) sending an aux trigger output to the vacuum solenoid that opens the butterflies for the short intake runners, which also changes the slope of the fuel delivery curve. So there's effectively 2 fuel maps, one for the long intake runners and one for the short set.

Do the TBI throttle bodies have an integrated TPS, IAC, etc? Gonna use the built-in MAP on the MS?

$3.39/gal diesel this morning and even at that "deal" it is way to high.

Lowest anywhere in NJ for diesel is ~$3.70 now, and about $3.35 for regular. $750 XJ for the win. :laugh:

 

[cmelo]

Re: THe NAC Lots-O-Post Thread

The aluminum part. I can weld the clocking adapter just fine.

I might be buying a suitable welder to do it. If you can find someone who can use it but just doesn't have the machine, they can use it.