Yes. I paid my VAT.

Sad, Harvey.... I know what you're getting at.

[Edited by BuRR - 3/1/2003 10:12:45 AM]

 

I've just bought a (new) APEXi 60mm boost gauge.

I fitted it this morning, and placed the tubing onto a spare nipple on the manifold.

When I accelerate hard, I notice a rattling noise coming from within the gauge (between about 0.3-0.8 bar)

If I feel the tubing as I'm accelerating, I can feel the pressure inside the tube pulsing to the same rhythm as the rattling, suggesting that this is the cause.

Is my gauge faulty, or should I really be tapping the tubing into the system somewhere else?

If its the latter, does anyone have a diagram please?

Thanks in advance.

 

Mine tapped into a small rubber pipe that is adjacent to the alternator and not into any spare nipple. Mine makes a small noise when on full boost during acceleration but thats it.

Hope this helps

Steve

 

If you can put a very small restrictor into the pipe going to the guage, this should reduce/remove any rattling. Something around 0.5/0.6mm will work well. eg idle jet from a Weber carburettor or similar.
Either that, or possibly some sort of inline filter may help to absorb/damp the fluctuations.

 

Won't this affect the pressure readings?

 

The best thing is a small clamp on a section of rubber tubing in the line. Gradually tighten the clamp until the needle stops vibrating and responds smoothly. The actual pressure reading is unaffected.
JohnD

 

pressure is pressure, no matter what size of hole it is fed through. It would only change if there was a leak somwhere.
Clamping the pipe would give similar results

 

I'll contact the place I bought it from on Monday. I'll see what they have to say. It shouldn't make that noise IMHO, not at the price I paid.

 

Burr
id call and check as mine dose not make a sound...........chris

 

stevieturbo and JohnD above are correct. The boost gauge is giving an exact reading of the pressure in the induction manifold. This means that the movement is undamped therefore if the pressure in the system fluctuates then the gauge reflects this. This can lead to the needle wavering and the gauge being noisy. The supply line to the gauge needs restricting this is best done by fitting a cable tie on the hose and clamping the hose until the gauge stops working then backing off enough to just start the gauge to read.

 

interesting

 

thanks to all who have replied so far, btw.

 

Although, you are right, at the price of the Apexi stuff, it should have inbuilt damping of some sort.

 

Funny this thread has come up---ive had the same problem with my Apexi gauge, and i was going to ask the same questions.Anyway---i decided to look into this myself and i ended up putting a 0.5mm restrictor about 10 inches away from the gauge---its quiet as a mouse now!!
From what i can see,the apexi gauge has a 1mm restrictor on the nipple on the back of the gauge--but this is too big to stop any fluctuation rattling.
i even had to strip mine and adjust it because it was reading -0.4bar at atmospheric pressure!!!!!!!!!
The persom who i brought it off(mentioning no names-person on this forum!!)fobbed me off by saying "they all do this sir-it'll settle down with a bit of use"
IMO the apexi is quite bad quality for the price,but it looks great when lit up!!!

 

easyrider - can you let me know where you got the restrictor from, please? or where I can get one from?

Cheers,

 

Ive had several emails about this,so im going to answer all of them on here so other people can see.

My restrictor is actually off of a gas boiler(Potterton Profile) which is located in one of the air pressure pipes-you will be able to get it at any gas cooker and heating spares shop(theres usually one in nearly every big town). The part number(gas council number) is 357-632--should only cost about a fiver.
You could also try a jet out of an old carburettor from a scrappy,which was sugested earlier.

P.S----i lied in my earlier post---the restrictor size is actually 0.34mm to be precise.

 

Thanks, mate..... I'll get onto it right away!

for the sake of a fiver, you'd have thought APEXi would have got their act together and supplied one in the box!

 

Fitted it today.... THANKS!

My rattle has gone

 

No worries mate.

 

Would be that be £5.00 including VAT ?

 

lol

 

i dont pay vat ....lol

 

lucky you Chris