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10-12-2009, 06:52 PM | #1 |
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Boost gauge question....
I just installed an Autometer 3301 boost/vacuum gauge on my 383 with a vortech supercharger. I have a question about normal operation of the gauge. At a steady 60 mph/2800 rpm/4psi boost, the needle flucuates so fast you can barely read it (+/- 3 psi). I'm new to superchargers and this is my first boost gauge, but that just doesn't seem right. I installed it exactly like the autometer instructions said and used the port that Vortech recommended. Do I have a leak? Any suggestions? OBTW, it's in the in the same port that goes to my MSD 6BTM box. Thanks in advance.
R/
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 Last edited by Hart_Rod; 10-12-2009 at 08:00 PM. |
10-12-2009, 08:50 PM | #2 |
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Location: east, tx
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Re: Boost gauge question....
I have done a bunch of blowthru procharger stuff. Where exactly is the gauge hooked to on the engine. If it is showing 3psi driving normal sounds like you have it above the carb, it will never show vacuum.
What is the setup? carb, fuel inj, and does it have bypass valve.
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68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress |
10-12-2009, 09:04 PM | #3 | |
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Re: Boost gauge question....
Quote:
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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10-12-2009, 09:12 PM | #4 |
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Re: Boost gauge question....
probably, it could be compressor surge sounds like there is no bypass valve
I put the boost gauge on the intake manifold so I could see the pressure in the motor and not above the carb. Also I used a bypass valve that dumped boost when driving normal so the supercharger was not is a bind.
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68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress |
10-12-2009, 09:34 PM | #5 | |
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Re: Boost gauge question....
Quote:
R/
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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10-12-2009, 09:54 PM | #6 | |
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Re: Boost gauge question....
Quote:
The bypass valve helps ease the load on the supercharger under normal driving, it also helps flooding issue when you suddenly let off the gas. The valve should be located between the blower and carb, it operates off of vacuum, so when driving normal you have vacuum and it opens the valve, dumps unwanted boost. When you floor it you loose vacuum and it closes and sends all the boost in the engine. As far as the MSD boost retard line, it needs to be on the intake also, otherwise you will be retarding the timing under normal driving because it will see boost between the carb and blower. Another note, fuel pressure should rise with boost, so you should have a fuel pressure regulator with a vacuum line connected between the carb and blower. I will have to email you pics, they are too big to load here if you want.
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68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress |
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10-13-2009, 09:36 PM | #7 |
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Re: Boost gauge question....
OK, I hooked the gauge up to the same port that the tranny modulator is connected to. The gauge now is more stable and shows about 14 hg of vaccuum at ide. I took it for a test run and and got on it a couple of times, but nothing real hard. The gauge would go to zero but I don't think it went positive (boost) for very long. Is this geting closer to the way it should act?
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
10-13-2009, 10:03 PM | #8 | |
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Re: Boost gauge question....
Quote:
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68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress |
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10-13-2009, 10:21 PM | #9 | |
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Join Date: Apr 2005
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Re: Boost gauge question....
Quote:
R/
__________________
Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 Last edited by Hart_Rod; 10-13-2009 at 10:21 PM. |
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10-13-2009, 10:39 PM | #10 |
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Re: Boost gauge question....
I have used a mallory 4309 regulator for below 15lbs of boost, but I don't know what your fuel pump is. Hope not a holley blue style!!
My 1rst setup I used a mechanical edelbrock pump that had the clockable bottom. I drilled and tapped the top of the pump for a 1/8 nipple and ran a vacuum line to it. It would raise fuel pressure with boost then, but I only had 8lbs of boost back then. If you run your fuel pressure at 7lbs and have say 10lbs of boost that means you will need 17lbs of fuel pressure and another 5 to overcome pumping loses and g force in the line, so 22lbs of fuel pressure at wot.
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68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress |
10-13-2009, 10:54 PM | #11 | |
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Re: Boost gauge question....
Quote:
__________________
Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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10-14-2009, 08:38 AM | #12 |
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Location: Ottawa Ontario Canada
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Re: Boost gauge question....
Nice set up, is it the YSI? or an S or T trim?
I prefer the Vortechs to the PROCHARGER - more reliable. Do you have better pics of your set up? I'm sure the guys here would like to see. I noticed you have a blow through carb - do you have a wideband set up? I thought one was supposed to use a regular carb in the enclosure - the blow through cars are for the set ups where the carb is not enclosed. But if it works.. Last edited by Alex1; 10-14-2009 at 08:40 AM. |
10-14-2009, 01:22 PM | #13 | ||
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Re: Boost gauge question....
Quote:
http://www.holley.com/12-815-1.asp Compatible with alcohol or methanol fuels Flows 140 GPH (free flow) Flows 120 GPH at 9 PSI Maximum pressure is 14 PSI 3/8” NPT inlet and outlet ports Fuel pressure regulator is required (Recommend Holley P/N 12-704 for gasoline & P/N 12-707 for alcohol) Provides constant fuel flow with no pulsation Has externally accessible pressure relief valve (max 14 PSI) Rotor/Vane pump design is more tolerant of contaminated fuels Not designed or recommended for use with fuel injection systems I'm still waiting for Vortech to get back with me. Their customer service suxs...... Quote:
http://67-72chevytrucks.com/vboard/s...d.php?t=358692 R/
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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10-14-2009, 06:16 PM | #14 | |
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Re: Boost gauge question....
Quote:
Definately worth it. |
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10-14-2009, 06:34 PM | #15 |
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Location: east, tx
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Re: Boost gauge question....
Alex1 is correct about the wideband and reading your plugs. Wideband setups are expensive tho, if you were here in east tx you could borrow mine.
I don't think your fuel pump is going to cut it. Unless you only have 2-3 psi of boost.
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68 chevy truck ls3, 418ci, pump gas 10.81@121.8 all motor. 1.47 60ft 70 suburban 350 tbi swap, 700r4, work in progress |
10-16-2009, 10:20 AM | #16 | ||
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Re: Boost gauge question....
Quote:
Quote:
I finally got in touch with Vortech, :-/. They said I should have everything connected to a vaccuum source as you 2 suggested, . I've got everything connected to the same port that the tranny modulator is connected to right now, but I will rework everything the next time I pull the carb enclosure off. I think I found some manifold ports, but I can't get to them right now. They also said I needed the bypass valve if I was getting more tha n 5-6 pounds of boost. When I asked how much boost this setup should be putting out, they couldn't tell me and said they were all different, . So, what's the best way to figure this out without breaking anything? They also recommended getting a pressure or boost adjusted FPR. I'm assuming the signal for this will come from the same port as the boost gauge? I didn't realize all this supercharger stuff was so complicated, , .
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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10-16-2009, 02:32 PM | #17 |
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Location: Ottawa Ontario Canada
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Re: Boost gauge question....
Yes the wideband threads in like a regular 02 - there will be a box or display that you will have to wire in though.
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01-18-2014, 09:33 PM | #18 |
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Re: Boost gauge question....
I need to read all this.......a little later
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