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HP EFI CNP upgrade
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Paul P
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Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Sat Jun 24, 2017 2:00 pm    Post subject: Reply with quote

At least I am getting good at it. LOL. This is likely the one.







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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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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
119910.22 points



PostPosted: Sun Jun 25, 2017 8:48 am    Post subject: Reply with quote

It used to cost $75 dollars to get a patent back when I got the two I own. Filing fee, drawings of the part, and a brief description of what it does and what it is made of (include wood, brass, cast iron, and everything else your can think of to prevent someone taking you design and painting it green then stating it was made of Kryptonite). Can't be too hard to do as I had my secretary at the time file for me, and she just follower the instructions in the letter she received.

I am sure Edelbrock and Fast or HP will give you more than $75 dollars for the patent.

Big Dave
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Paul P
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Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Sun Jun 25, 2017 3:03 pm    Post subject: Reply with quote

The insert and sensor are from the HP EFI kit. The only thing I did was make the aluminum bracket. By the way this one would not require a trimming of the back plate of the water pump. I guess it could be patented. Being for a GEN 1 SBC might not be all that big of a market.
Paul

_________________
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: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Thu Aug 03, 2017 11:50 am    Post subject: Reply with quote

Wanted to post my latest experience with the system. I left the ECU switched on and drained the battery down to 2.4V. Yeah I know it was stupid. Rolling Eyes

I pushed in the battery kill switch while recharging the battery which didn't matter to the ECU since it is connected directly to the battery per the instructions. Battery charged up fine.

A few days later I did drive the car and it was ok at first but then the idle was sort of going open loop on my like 1800rpm. I drove it home and changed the oil since it needed it. The one piece felpro oil pan gasket is leaking pretty badly but that is another story which I won't get into.

After changing the oil I cranked the motor with the ECU off since I can do that now with a separate switch powering the ECU. Oil pressure came up and I flip the ECU power switch and tried to start the car. NO FIRE. I go in and grab the laptop to see what is going on. Here is where it gets interesting. All the sensor parameters are maxed out except for the MAP.
TPS 100%
Oil pressure 108
Fuel pressure 103
CTS low err
MAT high err

I posted this on the HP EFI support section and Danny Cabral the guru on the site said that the TPS, Oil and Fuel share the same ground. Try removing 1 sensor at a time to see if things return to normal. This did nothing. I tried reflashing the ECU and no change.

Now for the interesting part. I removed all the sensor plugs 1 at a time except for the MAP which was reading correctly at the time BARO and MAP were 2KPa difference. Nothing changed other than the standard not connected sensor response. Next I started plugging in the sensors starting with the MAT. It read correctly. Plugged in the TPS, CTS, Fuel and Oil sensors and all recovered. Strange behavior and I am sure Holley never tested this. Bottom line is it looks like as the voltage dropped with the ECU monitoring things it compensated for the voltage drop in some what and until they were all unplugged with the voltage restored it would not recover. I have since tried plugging the laptop back in and checking the sensors and they are still ok. Yet to drive it. Possibly later in the next few days now that the weather has cleared.

_________________
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: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Thu Aug 03, 2017 12:12 pm    Post subject: Reply with quote

these computers do random weird things when subjected to low voltage or left powered up until voltage drops really low. ive had to reload the entire tune before. go to restart the car after the battery went dead and the computer is blank. i have yet to have one that wouldn't recover though. just gotta work around the weird quirks until it knows everything is ok.
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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: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Mon Aug 14, 2017 8:33 am    Post subject: Reply with quote

Update. I did check it once after resetting everything with the laptop and it looked ok. Tried driving the car this past Saturday after it sat for a week. Strange thing was the TPS creeped up to 7-8% with the throttle closed! Idle sucked as you can imagine. Wasn't comfortable with this not happening again. Posted some more on the Holley support site and their guru suggested replacing the TPS. This system has 24hrs on it....

Did another TPS re-sync and drove it yesterday. Ran great with no issues. This was of course after purchasing another TPS. It must have known I bought one and decided to run ok. LOL.

Second thing that I ran into which I have been aware of but just have been dealing with. If the fuel tank has 1/4 or less I know from even with the Pro-Jection system the fuel pressure could vary a bit. I took the corner on my street after the test drive and boy did it take a gulp of air. 14psi of fuel pressure almost the whole way down the street to my house about 1/4 mile. Finally got back to normal about 100ft from my driveway. I am considering a Holley Hydramat. I know I need at least a single port but was considering a dual port for the Nitrous fuel system. The more I think about it I won't be using the Nitrous in anything but a straight line acceleration scenario so maybe to save some $$ I'll just use a single port mat. Certainly will make for a better driving street experience.

_________________
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: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Fri Aug 18, 2017 9:10 pm    Post subject: Reply with quote

two things worth mentioning...

the primary idle screw sometimes has a weak spring and will allow the screw to move from vibration. the secondary set screw will do the same thing.

i tell our customers that 1/4 tank is empty. especially with a return line aerating the fuel when its that low. if you dont have baffles in your tank to control fuel slosh, its worse.

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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: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Mon Aug 21, 2017 10:10 am    Post subject: Reply with quote

Hi Keith,
Yeah I took the screw out one time because of that weak spring issue. That was part of my problem when I got stuck with the car back on page 2 or 3 that I forgot to mention. I have the foam so it isn't too sloshy but what I want to get is a Holley hydramat except they don't make one with a -10AN fitting. Trying to ask them to make one. 15" x 15" would be fine. If I was getting picky it could be 15" x 18" to be perfect.
Paul

_________________
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: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Tue Sep 12, 2017 9:13 pm    Post subject: Reply with quote

Holley just responds with we don't make custom hydramats. thumbsdown Bull Sh!t

Asking for a -10AN is like asking for a 3/8" line back a few years ago. That is like a minimum pickup size.

_________________
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
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Joined: 30 May 2002
Posts: 3169

65093.54 points


1979 Chevrolet Camaro

PostPosted: Mon Sep 18, 2017 12:01 am    Post subject: Reply with quote

I just checked Holley's website and they make a 15"x15" Hydramat but with a 1/2" NPT fitting. Can't you just run an adapter from 1/2" NPT to -10AN?

What am I missing?

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Stop running from your pain and embrace your pain. Your pain is going to be a part of your prize.

I challenge you to push yourself.
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Paul P
Member


Joined: 15 Aug 2002
Posts: 2393
Location: Townsend, Mass.
81240.86 points


1971 Chevrolet Chevelle

PostPosted: Mon Sep 18, 2017 7:31 am    Post subject: Reply with quote

Yeah that is true. The thing is -10AN is 5/8". I would have to drill out the 1/2 NPT fitting to 5/8" in order for it to work. I looked at a fitting and that would leave less than .050" of thickness at the tip of the tapered NPT fitting which is a bit compromised at that thickness. The other issue is that adds height to it also which isn't optimal. They do make a few with -10AN for circle track so I have asked why not the 15x15 and all I get in response is "we don't make custom hydramats".
_________________
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
Back to top
View user's profile Send private message
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