cstav86
SILVER Star
Agreed. I edited my response to read clearer.
Davis DUI installation/evaluation
- Thread starter GJCruiser
- Start date
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I forgot to mention an important part of my DUI insertion. After inserting the DUI, I rotate the DUI body, so the rotor tip lines up with a mark on the body. The mark on the body was put there by me. It is what I transferred from the DUI Cap contact that I use for # 1, down to the edge of the DUI body. Pointing the rotor tip to that mark will time it at 0* BTDC. Rotating the body counterclockwise advances it. I estimate 7 to 10 degrees advanced.
And remember that for every degree you rotate the dizzy, you change the timing two degrees.
And remember that for every degree you rotate the dizzy, you change the timing two degrees.
I thought I’d mention it to any of the DUI users that are not already aware. Performance Distributors warns that even though your DUI is fully seated, it’s possible to be over seated. It’s important to make sure there is not the slightest gap between the dizzy base and the block. Just a few thousandths gap will put pressure on the internals when you tighten it down and cause excessive wear. Check it with your smallest feeler gauge. You may have to use a shim washer as I must do.
Thanks for this info. I aligned with the line instead of the bb, repositioned the dizzy and it fired right up. I ran it for about 15 minutes while I burped the radiator. Excitedly hopped in and made it about half way down my long drive and it killed. Pushed it all the way back inside. Couldn't get it started again. Hoping to have time to take a look again tonight.
Man. Slow down.
When it starts.
Pinch off vacuum line. Adjust timing.
Get motor to 165 and adjust IAC as it says in manual.
Did you get it running?
I had some trouble with my install and found this thread very helpful.
Unfortunately no. I researched and monkeyed with this for weeks. I must have retimed it and double checked wiring 20 times. Checked spark plug gap, cable connections, etc etc. It would not start again with the DUI. Probably user error but I'm apparently too dim witted to figure it out.
Saturday I pulled it all and went back to Toyota parts and it started right up.
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brian
SILVER Star
did it have spark? cause that sounds a lot like the module s*** the bed.
Yeah I could not get spark. I figured I must have ruined something so I pulled it all off to se if the Toyota parts worked. They did.
Not sure if the benefit is worth trying to troubleshoot, get it repaired and reinstall. Some of you guys that have had success with it probably have opinions about that. I just want it running so I guess I'll keep the stock setup for now.
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I like them because I get to eliminate a ton of 30-40 year old electronics.
I don’t actually understand the science but the stock distributors are “curved” for smogged up trucks.
The DUI does not need this. I find they run better with Snipers and properly desmogged and tuned carburetors.
I don’t actually understand the science but the stock distributors are “curved” for smogged up trucks.
The DUI does not need this. I find they run better with Snipers and properly desmogged and tuned carburetors.
makes sense. It was an expensive piece of kit so I would like to get it working at some point. I'll probably have to take it to someone smarter than me to make that happen though
brian
SILVER Star
depending what year your oe dissy is...pertronix is usually the way to go.
not a fan of the hei's...in twenty five some plus years, one of them failing is only thing that resulted in me walking on side of the road....if there are ground issues, the heis will eat mods like candy.
If you can't get spark (vs. spark at the wrong time), then yes, something on the DUI is probably not right, everything else external to it is pretty basic (i.e. 12v input and spark plugs...).
The low revving straight 6 like these really shouldn't need anything very sophisticated. Mine already has pretty low compression and probably needs a rebuild. But I was having constant reliability issues, every time I drove it would have to set the timing and idle only to find one or both off next time days later, and wanted a somewhat modern reliable bit that was easy to drop in and wire up, without trying to figure out what the previous owner did to it (it looked like a '74 dizzy on the outside, but there were no points in it...).
On a stock engine, especially if it's got the kind or apparent use mine does, I wasn't expecting any kinda performance increase. Especially if you still have points, DUI should be a decrease in maintenance and generally more reliable. Assuming you don't have one that's just broken (electronic stuff is usually much more binary, it works good or not at all).
If you are going to try it again, I'd suggest you call the folks at performance distributors, especially if your sure there is no spark (opposed to just not timed correctly). They should be able to troubleshoot what they are making / selling quickly enough.
