Hi, i have a 2000 S2000 and i just got the Ultimate Racing Turbo kit installed, but i need help running the boost Gauge. The way i have it hooked up now it does not register boost, but it does register vacum. I have the boost gague teed off the BOV vacum line, i dont think this is right, but that is what the guy at UR told me. The Boost gauge is brand new, its an autometer, if that helps.

Please if someone could give me advice i would greatly appreciate it.

Thanx in advance!

 

I know this is a stupid question, but...are you making boost?

And I ran my boost gauge line from the vacuum line near the top of the valve cover.

 

no, it shows no boost at all....but the vacum is there at about 20-30 PSI, then when the gas is pushed it jumps to 0 PSI.....? I am thinking i have it hooked up wrong, but i hooked it up exactly how the guy told me. SO im not sure whats going on with it

 

Which autometer gauage is this? I have the cobalt which is a electric boost gauge. I had to wire my power to a specific power source. The tech at autometer said that the gauge needs a specific power source because it zeroes itself when you turn on the ignition. I had to call and find out the specific power source to tap into.

Might not be in your case but just throwing out a suggestion.

 

Gauge sounds like it working right...that's exactly what you would see in a NA car. But you never know...have a friend blow into the line going to the gauge...if he/she is good at blowing (easy guys) than you should be able to see a few pounds on the gauge...it'll tell you if it's working right or not.

 

Manifold pressure on a turbo engine is dependent upon throttle position. You need WOT and up to an rpm where the turbo is producing its max boost. Partial throttle like when you are just cruising or when you have closed the throttle to slow down, regardless of engine rpm or boost, will show vacuum.
You have the boost gauge reading off the correct place. This is a measure of intake manifold vacuum/pressure.

 

The throttle has to be open to get a boost reading.

 

thanx guys, got the problem fixed.....


i appreciate all the help

 

well first, im surprised at you all, i have read about this situation, and found that for one you dont measure vaccum in psi, but in in hg. mercury. the gauge works and the best possible place to tap boos from is the fuel pressure release on on teh fuel rail. that will show the absolute most accurate reading since the background vacum is highest.

 

I'm sure others will add to this ........................
You only read ONE thing.
Boost or vacuum can be measured in INCHES of Mercury or MM of Hg or MM of water or INCHES of water or in kilopascals or barr or ATM or PSI, in terms of PLUS or MINUS - take your pick. ALL are correct.

Taking the reading off the fuel pressure regulator vacuum line is NOT the only place to do it nor is it the BEST. Any of those lines from the intake manifold will do and ALL of them will get vacuum/boost pressure from the EXACT same place - the inside of the intake manifold.

ps. Don't believe everything you read and don't take so literally that what you read is the ONLY answer.

pps. "Pressure" and "Vacuum" is a universally understood concept. This is taught at school. It is measured in whatever way is understood by the user and all those I've listed above are known and understood by everyone (well, maybe not everyone). The concept doesn't change, only what you choose to call it. Go take a look at different types of boost gauges and you'll see different ways they are labelled.

ppps. My personal favourite is in terms of "elephant toes" - How many "elephant toes" of pressure is this?