Not making boost.....what could the problem be?

BlackFox5.0

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Aug 7, 2000

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Massachusetts

Apr 4, 2004

#1

• Apr 4, 2004

• #1

I put in my a-trim and took it for a test drive, I have a boost gauge with vacuum, and when I get on it, the vacuum goes up to 0 holds, then goes up to like 1-2psi around 4000-4200rpm.

I've got a power pipe, a 6" crank pulley, and a 3.12" blower pulley.

Shouldn't I be making boost much sooner? What could the problem be? I have the belt on not extremely tight, but it's on, I just pushed down on the pulley and tightened it up, I didn't use a wrench (should I have?) How tight is the belt supposed to be? Should it be really cranked on there? With virtually no play?

 

BlackFox5.0

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Aug 7, 2000

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Massachusetts

Apr 4, 2004

#2

• Apr 4, 2004

• #2

I tightend up the belt and it's still not making boost soon enough, it comes on around 5000rpmish. Shouldn't the boost come on a lot sooner? In first gear, when I ease it up into the rpms (so as not to break the tires loose) the car died like I hit the rev limiter.....

I still have 87 octane in my tank and my Autolite 24s are still at .050, I was going to change them but it started pouring out.....I don't see how this would affect my boost though. Timing is around 13* I think.

I plan on gapping my plugs to .034 ,and backing the timing to 10* and filling up with 93

As of now my car feels no more powerful than before.....

 

G

go4it

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Jul 15, 1999

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Virginia

Apr 4, 2004

#3

• Apr 4, 2004

• #3

The belt needs to be pretty tight. I use a torque wrench and and a 1/2" extention and put it in the square hole on the adjuster. I set mine on about 90 ft.lb. Try tightening it up and see how it does.

 

G

go4it

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Jul 15, 1999

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Virginia

Apr 4, 2004

#4

• Apr 4, 2004

• #4

You posted while I was typing that. Yes regap the plugs ( could be blowing the spark out) and get some hi-test.

 

BlackFox5.0

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Aug 7, 2000

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Apr 4, 2004

#5

• Apr 4, 2004

• #5

I'll do as much as I can tommorrow after work. I've never heard about a spark being able to be blown out....

When should I be getting boost around?

 

T

TheUser

Active Member

Jul 25, 2003

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Springfield, MO

Apr 4, 2004

#6

• Apr 4, 2004

• #6

yeah you might check the power adder forum, but I think gap w/ a blower is around .030-.035 because the blower forces air in there and blows the spark out if it's jumping such a big gap

 

9

90stangLX302

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Dec 2, 2003

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Good ol' Bellaire Ohio

Apr 4, 2004

#7

• Apr 4, 2004

• #7

The spark plug sparks at tdc when the valves are closed. How would air being pumped in blow out the spark plug? Just a curious guy

 

P

PRO50SC

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Dec 28, 2003

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Olney, Maryland

Apr 4, 2004

#8

• Apr 4, 2004

• #8

BlackFox5.0 said:

I put in my a-trim and took it for a test drive, I have a boost gauge with vacuum, and when I get on it, the vacuum goes up to 0 holds, then goes up to like 1-2psi around 4000-4200rpm.

I've got a power pipe, a 6" crank pulley, and a 3.12" blower pulley.

Shouldn't I be making boost much sooner? What could the problem be? I have the belt on not extremely tight, but it's on, I just pushed down on the pulley and tightened it up, I didn't use a wrench (should I have?) How tight is the belt supposed to be? Should it be really cranked on there? With virtually no play?

Click to expand...

I have a 92 LX w/ a Procharger 9lb boost and an 3 core intercooler. I don't see full boost until i'm close to 6000 rpm's. According to the speed shop, this is normal. I run Autolite 23's gapped at .030. Car runs fine. Definitly get rid of that 87 octane. Detonation is very bad for a blown application. Remember, the faster that pully spins the more boost it will make so it stands to reason the higher the rpm's the higher the boost.

 

BlackFox5.0

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Aug 7, 2000

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Massachusetts

Apr 4, 2004

#9

• Apr 4, 2004

• #9

I have a feeling I might put that 7" pulley on there, lol