jrsc troubleshooting

Anyway its not boosting, even after having the sc rebuilt by jr. It reads 10-20 lbs vacuum from 1500-5000 rpm

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Boost aside, it sounds like you're having either motor problems or a faulty boost gauge. A non-boosted car should hit 0 vaccuum as soon as the driver hits WOT. Are you reading the gauge at partial throttle or WOT? You won't make much (if any) boost at partial throttle.

1. If you dont have the spacer between the tb and inlet will it affect anything? I only have a gasket and sealant there.

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TB spacers are a waste of money. Slap a gasket and some RTV between the TB and the TB bracket and you're good to go.

2. Does a egr code affect sc in anyway?

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No, it doesn't effect the supercharger, but ANY check engine light will cause the car to go into a "safe mode." This means the car will retard timing approximitely 5 degrees and you will lose power.

3. Does the boost guage connect to the black box via hose?

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Yes, a small piece of tubing that can handle high pressure will be used to hook up the boost gauge. Since many people get rid of the black box eventually in favor of real tuning, most opt to use a different reference line. But the black box line (if hooked up correctly) should work.

4. Does belt length affect boost? I'am running a 99.5" with good tension, but squeels at start up?

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If the belt is slipping (which yours is and it will only get worse) then yes. A lose belt will cause the belt to slip and not properly spin the pulley for the supercharger.

You need to read this: http://www.fordracingparts.com/rbr/tech/files/FRPP_JRSC_Belt_Details.pdf and follow the directions. You have the new alternator bracket and should be using a different belt routing.

5. What are the chances of the black box malfunctioning? the cover on mine is bent inward, but I know its protected with resin filling.

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As long as it's not broken (which it sounds like yours might be) it should work fine. Hell, if you're that worried about it shoot me a PM and you can have one of my spares, just pay for shipping.

6. Is it safe to drive the car like this reading 20lbs vaccum, 2 weeks till I get it to the shop?

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Something is wrong somewhere. It sounds like your boost gauge isn't hooked up properly. Since your gauge and black box are hooked up to the same reference line... your car coul have some problems if the black box isn't working. If your car is showing vaccuum when you're in boost, the black box will not send extra fuel to the engine and you could blow the motor.

Stay out of boost and try to figure out the problem. I'm betting something is hooked up wrong.

Nate

If you are running a 99.5 belt I am assuming you are using a 2.5" BBK pulley. With that set up you should get a chirp at start up. But that belt length should provide perfect boost. It is the exact setup used on my son's Zetec. BUT...You should not be using the JR black box as it will not provide fueling for your setup.

As far as vacuum hoses are concerned, always hook up your boost gauge and, if you are using it, the JR black box to the two lower vacuum fittings on the large aluminium supercharger manifold near the firewall. Do not hook any boost reference hoses to the TB casting. This casting only reads vacuum. The fittings below the supercharger on the back of the intake manifold are the fittings that see both vacuum and boost.

The EGR code makes me thing you've got a vacuum hose hooked up wrong. It sounds like the installer didn't get everything worked out correctly.

Take a copy of the JR instructions and follow all the hose routings carefully. There are photos of the hose routing in the instructions. You don't have to wait two weeks to get to a shop. Just follow the photos and the instructions Nate and I have given you and the problem can probably be solved in your driveway.

If you are running a 99.5 belt I am assuming you are using a 2.5" BBK pulley.

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Why does my BBK need a 104.5" belt?

I'am getting 20lbs of vaccum at idle and while cruising, but at throttle it goes up to 0 but not into boost. The sc came off a 02 zetec but is now on my 04 zx3. The belt is a 99.5" and the alternator bracket will not reach the mouting hole on the unit.Its a stock 6 psi kit, no big boost till I get this thing figured out. The hoses all seem ok, no leaks I'am aware of, other than the gasket at the tb which we had to custom fit.

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an undersize crank pulley will cause this. I forgot to change it back to stock size when I put in my jrsc. it hit 0 with the 3.6"SVT pulley steup but as soon as I put the stock 5" crank it started puching 5psi

Thank you Sir, I will get on it tomorrow morning. I did all this already....but maybe something is binding like you said. Im sire you know more than anyone how to fix these things. Thanks.