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HP EFI CNP upgrade
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Paul P
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Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Wed Apr 12, 2017 4:01 pm    Post subject: Reply with quote

Done with under the hood for the most part. Sold the Jacobs Nitrous Mastermind and installed the Holley progressive SS relay so that the HP EFI system can control the Nitrous too. I did also upgrade to a 200Amp alternator to keep the coils happy.


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2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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10sec.et
Member


Joined: 29 Mar 2006
Posts: 3469
Location: Houston,Texas
346534.52 points


1969 Oldsmobile Cutlass

PostPosted: Thu Apr 13, 2017 12:07 am    Post subject: Reply with quote

VERY NICE!!! i like the way you did the coils. we just did a 63 Impala and put the coils down behind the wheel well. that was no fun at all. out of sight but miserable to put wires on.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Thu Apr 13, 2017 7:38 am    Post subject: Reply with quote

Yeah I didn't have to cut a single plug wire. 1 and 3 are swapped because of length but you would never know really unless you look closely. I finished up under the dash last night and loaded the new global file that i built for this setup. It fired right up first crank and runs pretty good the 200 Amp alternator maintains 14.5V at an idle Exclamation . I don't have much fuel in it so I only ran it for a few minutes but it lives. Burn Out
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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10sec.et
Member


Joined: 29 Mar 2006
Posts: 3469
Location: Houston,Texas
346534.52 points


1969 Oldsmobile Cutlass

PostPosted: Sat Apr 15, 2017 12:55 am    Post subject: Reply with quote

thats great! that system definitely needs the voltage. weird stuff happens at 12 and below. ive had pure hell with 1 wire alternators and low voltage at idle. glad its running . now for some WOT tuning Cool
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
Member


Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Mon Apr 17, 2017 9:17 am    Post subject: Reply with quote

Thanks Keith. I had to make a new upper bracket for the alternator due to the case having a square boss just to the right of the bolt hole. It looks kind of weird with the angle in it but it gets the job done. Not sure if I will put any holes in it due to the stress that will be on it. If it was a straight push it would be ok but not with the bend there. Still have to get some fuel and fix my hood that I cracked leaving the pins out DOOH!
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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af2
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Joined: 01 Sep 2003
Posts: 5557
Location: grassvalley, ca
71191.50 points


1933 Willys Coupe

PostPosted: Wed Apr 19, 2017 8:27 pm    Post subject: Reply with quote

Paul, That is very nice clean work!!
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Paul P
Member


Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Thu Apr 20, 2017 8:22 am    Post subject: Reply with quote

Thanks Adam. I did cut all the original wires out of the original harness that ran across the firewall from the fuse panel to the passenger side to clean it up. These were for the charcoal box emissions solenoids, old resistor wire for the points and who knows what else. Still hard to get it all tucked behind the coil racks. Hope I don't have any EMI noise issues now that it is all tucked away. It would suck to have to move the harness that feeds the coils.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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10sec.et
Member


Joined: 29 Mar 2006
Posts: 3469
Location: Houston,Texas
346534.52 points


1969 Oldsmobile Cutlass

PostPosted: Wed Apr 26, 2017 12:33 am    Post subject: Reply with quote

very nice work Paul! Cool Cool Cool

i love that Holley setup. the Dominator EFI is our choice at work. transplants with factory ECUs are a headache. so many weird issues. the Holley system solves nearly all of that. they have the V4 software out now. it does a bit more. still some areas for improvement but , IMO, the best system on the market.

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
Member


Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Wed Apr 26, 2017 5:29 am    Post subject: Reply with quote

Thanks Keith. That Dominator ECU is nice but a bit pricey. Maybe some day I will upgrade but for the money I would really only get the second O2 sensor output. If I went with twins it would certainly something to consider.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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Paul P
Member


Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Thu May 04, 2017 2:55 pm    Post subject: Reply with quote

Well I did fill up the barrel with 2.5 gallons of Torco accelerator and 8 ozs of Ethanol equalizer and 93 pump gas. Should be up around 107 Octane. The air cleaner did interfere with the coils but I bent the flange up so that we are good to go. I will have to have it welded up with some adjustments to that aluminum base that the seal mounts to. All good heading out for a local car show to drive the thing and see how it behaves.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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10sec.et
Member


Joined: 29 Mar 2006
Posts: 3469
Location: Houston,Texas
346534.52 points


1969 Oldsmobile Cutlass

PostPosted: Fri May 05, 2017 12:39 am    Post subject: Reply with quote

awesome! keep us posted . im anxious to hear how it does.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
Member


Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Fri May 05, 2017 8:04 am    Post subject: Reply with quote

Car ran good very smooth no more miss 🔥 at all. So I drove about 15 miles up to a Chrysler dealership to visit a friend and shut the car off. Turns out he was off that day no big deal it was a nice first ride.

Now for the interesting part of the story. I get back in it to leave and it just cranks "no start" not even a blip of life at any throttle position. I am really at a loss sitting there. I call AAA for a tow. I have plus so it is free. Sitting there for 90 minutes I try to start it as it cools off. Nothing for the first few attempts. It gets to around 150 degrees and I am able to get it started. I let it idle for a bit all seems ok. I turn my headlights on and it dies immediately. I tried it again same thing. Next time I try turning on the heater blower it is fine so it isn't any draw specifically except the headlights. I was able to get it running once before the flatbed came and pulled the headlight switch real fast and it kept running. So I thought about driving it home and said to myself it isn't worth it, just take the free ride back which I did. One thing to mention here was that about half way to the dealer I turned on my headlights while the driving at about 75mph and the car didn't die. Really odd behavior and no real explanation.

So my thoughts on the headlight switch first off. Normally the switch has 2 clicks when you pull it to turn on the parking lights first click and headlights second click. It has a click that turns on the parking lights in between the off position and what I would consider the first click. I am going to replace the switch. The fact that it isn't shorted and blowing a fuse is still got me wondering what is going on with this thing?? I have been thinking about it and what I am using to turn on the ignition relays is the fat red wire that used to feed the coil before. I think it may be on the same circuit as the headlight switch and there is some kind of spike going through the circuit killing the relays for the ignition for a brief moment and shutting off the car. Solution for this if the new headlight switch doesn't solve it is to wire up a switch for the ignition coil relays directly to the battery.

The rest of the situation might be setup related. Hot start enrichment and TPS resync could solve the hot start issue. I did notice when it cooled down that if I cracked the throttle open a bit it started a bit easier so that is speaking to me.

All good I got it home and will figure it out. Update to follow.

_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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Big Dave
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Joined: 04 Dec 2005
Posts: 2643
Location: Tampa Florida
119875.76 points



PostPosted: Fri May 05, 2017 12:11 pm    Post subject: Reply with quote

Digital devices often have a built in isolating circuits that prevents the device (such as the Holley CPU, or a digital radio) are disconnected if it sees a voltage spike, or a dip, or a change in polarity. They reset after a while. But I have no idea what resets the circuit (I got my engineering degree before transistors were invented). The reset mechanism is the digital equivalent of a circuit breaker as opposed to a fuse that blows open and has to be replaced.

Big Dave
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Paul P
Member


Joined: 15 Aug 2002
Posts: 2388
Location: Townsend, Mass.
81072.84 points


1971 Chevrolet Chevelle

PostPosted: Fri May 05, 2017 1:42 pm    Post subject: Reply with quote

Thanks Dave. At least I know the ECU is connected directly to the battery so my assumption is that the relays are being toggled by the headlight switch issue. I now have a new headlight switch and toggle switch to hopefully remedy the issue. We'll see what happens. It is easy to duplicate that is for sure. Start car >> turn on lights >> dead.
_________________
2001 Focus 2.0 Zetec
15.63@87 MPH 1/4mi
1971 - Chevelle 408 SBC N.A.
6.95@98.6 MPH 1/8mi
10.97@121 MPH 1/4mi
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SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3168

65064.64 points


1979 Chevrolet Camaro

PostPosted: Fri May 05, 2017 9:13 pm    Post subject: Reply with quote

Did you have this problem before the ignition upgrade?

Have you connected a PC to the EFI computer to see what it's doing? What battery voltage does it see?

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