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71K5 - BP71K5's Just for fun build

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Update 9/12/2017

Bit more success this time. Turns out my emulator wasn't actually emulating so the computer was idling in "limp" mode which was why it wouldn't do anything above idle. Once I got a programmed chip in there instead, it was much better. Fuel pressure was also low at 8psi, and it's up to 10psi now. The pressure gauge doesn't have much left to increase so I've got a new tbi injector tree on order that lets me run larger modern injectors.

Cue video:

Now I just gotta figure out why the thing doesn't move when I put it in gear.:confused:
 
I think for normal driving the 350 injectors should be able to keep up. Should only be a problem when you're working it hard, or the revs get higher under load...but i'd bet it'd be fine doing a half throttle pull to 4500 or so.

T-case in neutral? Drive shaft not installed? :D
 
tRustyK5 said:
I think for normal driving the 350 injectors should be able to keep up.

T-case in neutral? Drive shaft not installed?
Click to expand...

Normal driving is for my honda. :D

I'm somewhat stumped at the transfer case. I think everything is in gear, but it sure feels like something isn't. Gotta remove the driveshaft and see if rotating the output will let something fall into place.
 
After some investigation, I was able to shift the transfer cases into gear for sure. Then when I spin the driveshaft by hand, I can see the gears in the trans turning (after removing the shift tower). That should not be possible if the clutch is clamped to the flywheel like it's supposed to.

Only two options I can think of:
1. The splines on the clutch disc broke off when I installed the motor. I read a review about someone else with the same problem on summit.
2. The trans input shaft broke

I'm suspecting #1 unless someone can come up with a better theory. In any case, gotta drop the trans to see what's going on. :(
 
I rebuilt a NV4500 that had an input failure about 10 years ago. what an unbelievable mess inside...

I hope you find something less spectacular and less expensive!
 
Update 09/15/2017:

Fairly fortunate. The snap ring on the clutch disc hub came off and so wasn't engaged with the trans input. No other damage I can see. I must have not had it lined up well when I put the motor in and made it come loose. After double checking that turning the motor by hand actually turns the transfer case output, Im in the process of putting it back together.
IMG_4822.JPG IMG_4823.JPG IMG_4824.JPG
 
09/17/2017:

Anybody else's garage get this crazy. I keep losing stuff I know I have so this mess has got to get back in order:
IMG_4833.JPG

Finished up most of the crossmember, and made a spot for a new sticker.
IMG_4825.JPG IMG_4826.JPG IMG_4827.JPG


ORD includes a hose that I used to set up a site tube to check the oil level. Only concern I have it whether it'll hold up to the heat under there.

IMG_4829.JPG

And the clutch is indeed working. I drove the thing down the street in low range so transfer case shifters are up next. Still running lean, but the fuel pressure is at 12psi and the regulator won't go any higher. Doesn't seem right, but all the big stuff is done. Just needs fine tuning.
 
AJs72K5 said:
Where are you measuring the fuel PSI? At the regulator?
Click to expand...

Yes, which happens to be integrated into the throttle body. Seems kinda impossible that it's only able to go to 12psi, even with the upgraded spring. I wonder if I can check my gauge.
 
Cranked up the regulator as far as it will go. Only getting 14psi on the gauge. I guess that's about what I was running on the other motor, but the regulator screw wasn't turned in very much. Something seems wrong, but tunerpro is telling me it's still running very lean which seems to agree with the pressure.

I have a TEE fitting on the fuel inlet with a hose to this gauge. I guess I should check for blockages but it should be higher than that. IMG_4834.JPG

Anything above 128 is lean. I may try to modify the fuel tables to give it more fuel while I'm waiting on new injectors.
IMG_4836.JPG
 
Is this still with the 350 injectors? I think 14 ish is about what a TBI pump maxes out at...

I do recall "normal" range for the TBI set-up was between 10-12 psi and able to bump to about 14.
 
tRustyK5 said:
Is this still with the 350 injectors? I think 14 ish is about what a TBI pump maxes out at...

I do recall "normal" range for the TBI set-up was between 10-12 psi and able to bump to about 14.
Click to expand...

Yep still smaller injectors. But I have a Bosch fuel pump which is supposed to be capable of way more than 14psi. Maybe the filter is clogged, pump is worn out, line is kinked, or some other unknown problem.
 
Ooh I like the crossmember. I may have to borrow that design for my Magnum Box. :D It goes nicely with the ORD engine crossmember.
 
bp71k5 said:
Thanks, are you using a doubler/magnum? I'm always interested in seeing how people mount these things.
Click to expand...

Magnum. Right now it has a 4L80E, but I might be changing that to a 6L80E. ANy issues with the 6L80Es?
 
That's what my 08 2500hd has in it. Edit: I guess it's actually a 6l90
 
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