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Author Topic: data logs from test and tune 10-20-13  (Read 12313 times)

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Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #15 on: October 23 2013, 08:11:47 PM »
ok purchased a new fuel pressure gauge to, taped it to the windshield, pressure was 42 line off 38 line on, i went for a ride I made about four hits, 22psi of boost and 62 psi on the fuel gauge all four times. got back home and put it in park my son noticed that the fuel pressure had dropped to 35 line on, I pulled the line off and it went to 42, I put it back on and it was 34-35. I had Brian go to the back of the car and move the wiring harness for the fuel pump and he said that the pump was kicking on and off (car is running in park). So I goto the back and this is the first time that I ever hear my fuel pump making the winning sound and it was kicking on and off. could it be going bad and just acting up once it has heated up?.


I also reset my TPS -- .42 idle 4.78 full throttle (no floor mat)


I checked voltage -- battery has 14 , alternator 14, scan master 13.7, when my fans kick on the battery and alt. goes to 13.8 and the scan master goes to 13.4.
what are the other important areas to check the see where I am losing between the alt and the ECM
« Last Edit: October 23 2013, 08:24:00 PM by TurboCajun »
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #16 on: October 24 2013, 10:31:18 AM »
new walbro 340 is on it way.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: data logs from test and tune 10-20-13
« Reply #17 on: October 24 2013, 04:47:44 PM »
sometimes that is just the way the ecm outputs.  Remember that the ecm is converting an analog voltage to a digital output.  Sometimes you cannot find out why it is varying.

Check the voltage at the ecm-ign fuse and see what it says.  Then drop the column down a bit and wiggle the ignition switch around and see if the voltage changes on the scantool.    http://www.vortexbuicks-etc.com/ignition_switch.htm

I have seen major voltage changes due to bad connections at the switch

And I have seen corroded blades in the fuse block.

And then...I have measured the voltage going into the ecm and it would be several tenths higher than the scantool was showing so go figure.  I just figured the ecm was converting to digital and getting the wrong answer
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Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #18 on: October 25 2013, 09:34:53 AM »
Thanks guys.
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #19 on: October 26 2013, 11:08:52 PM »
ok received my new fuel pump and no where on it does it say 340, the numbers stamped on it is f20000169 - 02113-1 , how do I know if its a 255 or 340?
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: data logs from test and tune 10-20-13
« Reply #20 on: October 26 2013, 11:34:30 PM »
that is the modern version of the 340.  The 340 is a 255 liter/hour pump

that is the number that was failing left and right a few years ago but was supposedly fixed by walbro.  I think the 340M was discontinued
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Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #21 on: October 26 2013, 11:39:01 PM »
it states that it is good for up to 600hp , I should be ok with this on right
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: data logs from test and tune 10-20-13
« Reply #22 on: October 26 2013, 11:40:15 PM »
yep

Grumpy went into the nines on one and spraying alky
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Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #23 on: October 26 2013, 11:41:16 PM »
Thanks I just wanted to make sure before I dropped the tank,
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline bescurred

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Re: data logs from test and tune 10-20-13
« Reply #24 on: October 27 2013, 10:33:02 AM »
Quote from: TurboCajun on October 26 2013, 11:41:16 PM
Thanks I just wanted to make sure before I dropped the tank,


When we slapped in a new pump in my dads GN we repainted the straps and tank...looks really clean since you can see the bottom of the tank from the rear...
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Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #25 on: October 29 2013, 08:54:48 PM »
installed the new pump today but didnt get to test , what I pulled out of the tank was a GSS307M
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: data logs from test and tune 10-20-13
« Reply #26 on: October 29 2013, 11:14:47 PM »
pretty old...but I replaced a 307 a few months ago, myself
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Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #27 on: October 30 2013, 06:41:42 PM »
well , I put the fuel pressure gauge on the car and turned the key on and nothing.. both of the relays are working and shutting off after 3 sec, I am by myself and I am guessing it needs to be primed or I did something wrong in the tank, the 307m was already wired in with splices so I just used the connector from that and plugged into the new pump without checking the wires. (I was thinking that they are wired the same). I see on the wiring that there is a wire for pump priming, can someone tell me where it is, or do I have to jump the relay . remember I still have the 85 wiring
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft

Offline Steve Wood

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Re: data logs from test and tune 10-20-13
« Reply #28 on: October 30 2013, 06:46:57 PM »
if the pump is sitting in gasoline, it should need no priming.

on the ic cars, the pump test connector comes out of the wiring harness just below the alternator at the front end of the valve cover...also the tach connector.  Pump connector is a single gray wire.  Put 12 volts to it and the pump should run continually.

Did you hear the pump run for a couple of seconds when the key was turned on?
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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline TurboCajun

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Re: data logs from test and tune 10-20-13
« Reply #29 on: October 30 2013, 09:14:08 PM »
no I did not hear the pump, I guess the tank will have to come back down.     :013:
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85 GN -- Converted to 87 set-up using 66/72 turbo, front mount I/C, 80lb injectors,gn1 heads 14 bolt 1.65 roller rockers stud mount, ported intake with plate, fuel hot wire, 3" dp, running 24psi., alky kit, stroker 20 over, 212/206 roller,  best time 10.995 @ 121 1.56 60ft
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