Ok, so I'm on my lunch and I just went to oriley and got a restrictor pill to put in. because I have been running without one since I built the engine. I put it in, and my idle vacuum went down from 16inhg to 12inhg. When driving I came to hill and went down it in 2nd gear at 3k and the car did not move from 12inhg. I am wondering if I go into boost, will it not read the actual amount of boost I am at. For example if the engine is seeing 10psi, but the map sensor and boost gauge is only seeing 5psi? I am using the oriley 3/16 vacuum restrictor.

http://www.oreillyauto.com/site/c/de...ors+-+straight

 

Make sure it's not clogged. If the readings are instead accurate you should probably look for vacuum leaks.

 

Its not clogged. I took it out of the package, cut the hose and put it in. Nothing else. 16inhg before, 12inhg after. Bypass the pill and its back to 16inhg. No vacuum leaks. Idles fine at 1k and no surges.

 

Where are you getting your vacuum numbers from? An aftermarket gauge, or from the MAP sensor (Rtek)?

Any chance one of the pieces of hose you're using got nicked when you cut it in half?

 

no chance of anything getting nicked. This is the second time this has happened but my 1st time posting about it. The reason why I have been riding without one for so long. I am getting the source from the top nipple on the uim, behind the alternator. I cut the hose there and place the restrictor in between. The line continues to a t which goes to my manual boost gauge and the map sensor. The rtek always reads the same as my boost gauge. I don't have my computer here too look at it but i'm sure they will continue to read the same. I was thinking that it could be too small, but I believe I tried a friends stock hose at one point and the same thing happened. The boost gauge is an aftermarket faze gauge but like I said it has always been dead on with the rtek numbers. It seems like the is a more of a "put your head in the seat" feel when boost hits, but I am concerned that it is not reading boost correctly. So I haven't been to far into boost.

 

If the Rtek measurements do differ from the gauge, you'll know you're affecting the pressure signal to the ECU. You could compared the two side-by-side to be sure the ECU is still seeing the correct pressure numbers under boost. You could measure MAP sensor voltage output if you don't have a palm or computer handy.

Otherwise, you may be looking at a problem with restricting the airflow to/from the boost gauge. The restriction point is at the vacuum source before the tee, right? Put the restrictor at the MAP sensor itself (after the tee), and see what happens.

 

Ok will do, Will be posting back here tonight.

 

How big is the hole inside that *restrictor*. Nothing on that site says what the hole size is. It looks like a common 3/16" union. That ain't no restrictor is that is all there is to that outfit.

The stk Mazda orifice is what???? .5mm in dia. Something on that order. The .5mm is the inside dia of the fitting. The .5mm is .01968 inches. Kinda small.

 

Also just poke a needle or paperclip through the union piece you got. Just because it's supposed to have a hole through it doesn't mean the cheap plastic molding didn't block the hole, which is exactly why I said to check it in the first place.

RR88 is right, you should try putting it on just the line to the MAP sensor instead of before the tee.

 

Interesting... I have never had a restrictor pill in my line, not really sure what I'm supposed to be missing out on. I always did mean to pick one up, but the local mazda dealer isn't close I'd have to go there to order it and pick it up. If there was a way to get an O'rielys part to work properly I'd be interested.

 

i dont know the measurement of the hole but there is one there. There is a small metal ring inside the piece. I may post a pic tonight. I just routed it directly to the sensor and re routed my gauge to pull from the uim at the back. My gauge is reading normal again but im sure the map sensor will be reading short. Can't verify until I get off and grab my computer. Unfortunately it will be a couple of hours since im going to hear my gf sing in the school program lol.

 

also I may have posted the wrong part number, but it looks just like that with a metal, goldish ring in the middle. The size of the union is definitely /16 but not sure of the hole.

 

Mazdatrix lists the stock orifice as .5mm here http://mazdatrix.com/getprice.asp?partnum=13-9860-8931 I bought one not too long ago.

 

Finally lol!!! Thank everyone for all the help. So, yesterday after work I stopped at jack in the box and looked to see how big the hole is. It is very very small, like paper clip small. In the front its bigger then its tapered down to the smaller size. I popped it out with a one of those L shaped star wrenches then used wire cutters to cut the tapered part to a bigger size. It ran fine, but according to the boost gauge vibrating after 10inhg it was back to normal. So this morning on the way to work I stopped and bought another one. I re-routed it how I had it in the previous post because I changed it again at jack in the box. Today I brought my computer so I fired everything up and what do you know. It is working. Both number match and act accordingly. So, i'm guess that hole is too small to allow enough flow for the long routing to the mechanical boost gauge and the map sensor. At least its working now!!! Thanks again everyone!!!