..........I have learned a whole lot of facts about the 300ZX since I joined the forum and thanks to all for that but my curiosity is boiling over now and I need educating further please:

 

Can someone give me a simple way to let me know exactly what boost to PSi is and how this is calculated maybe a comparison chart and what effects all this has on the performance of the car. Thanks.

 

I know that boost is generated by the turbo's and that PSi i a measurement of pressure and the more you get the more power you generate. But thats just the basic effect not the facts of how it works.

 

 

BTW. I posted it here by mistake...... :eek: :(

I don't have a chart that shows the relationship between power and pressure, but all that's really happening is that the more air you put in, the more fuel you can burn so the more power that's generated. The trick is keeping the air and fuel in the right ratio.

Cheers Andy. Thats my problem I dont know much about keeping them in balance. If say my boost gauge is reading +7 and my foot is on the floor what PSi should I be at? thats the sort of question my mind keeps asking. I aint thick but want to learn more of the technical things so as I can get the most from my car.

 

I must say that after all the crap lately about Drivel posts and this forum lacking in the fundamentals of 300ZX talk and advice the response to my question has been rather poor what with the amount of experts the site boasts. :headvswal

 

But thanks for your input mate.

i'll see if i can have a go with this one vince although i'm certainly no tekkie

 

if your guage is reading +7 it will be a j spec and be measuring the pressure in mm of mercury

 

the 7 equates to 14 psi or aprx 1 bar of boost

 

does this help ??

 

regards,

 

alex

 

edit p.s. if you are boosting at +7 on your guage then it will have been modified because that is more than standard boost

i'll see if i can have a go with this one vince although i'm certainly no tekkie

 

if your guage is reading +7 it will be a j spec and be measuring the pressure in mm of mercury

 

the 7 equates to 14 psi or aprx 1 bar of boost

 

does this help ??

 

regards,

 

alex

 

edit p.s. if you are boosting at +7 on your guage then it will have been modified because that is more than standard boost

 

 

 

 

 

FANNY BLOODY TANSTIC MATE.

 

Thats exactly what I needed Alex. Thanks to you both now i am aware :bow:

 

+7 = 14psi and 1 bar of boost I understand what Macca is going on about now when he says what boost he is getting. i have always felt a little bit left out when i see post of this nature. Dumb nuts question now......

 

If you was running +14 on an after market boost gauge then would that equate to 28 psi and 2 bar? or is it not as simple as that mate? :bow:

FANNY BLOODY TANSTIC MATE.

 

Thats exactly what I needed Alex. Thanks to you both now i am aware :bow:

 

+7 = 14psi and 1 bar of boost I understand what Macca is going on about now when he says what boost he is getting. i have always felt a little bit left out when i see post of this nature. Dumb nuts question now......

 

If you was running +14 on an after market boost gauge then would that equate to 28 psi and 2 bar? or is it not as simple as that mate? :bow:

 

yes mate i think so - although i'm not sure you would get an aftermarket guage in mm mercury - they awlays seem to be either is psi or bar

 

regards,

 

alex

Thanks Al'. I really am grateful mate. I have had that hanging over me for ages now.

 

A pint at the JAE. but only if you wait for us this time??? :rofl: :rofl: :bow:

A value of 1 atmosphere (1 atm) is equal to the density of mercury times the height of the mercury in the tube minus the height of the mercury in the dish, times standard gravity and assuming a temperature of 0 degrees Celsius. (Standard gravity equals 32.174 feet/seconds squared or 980.665 centimeters/seconds squared) (Density of mercury at 0 degrees Celsius equals 13.59050 grams/cubic centimeters) .

 

Therefore 1 atm = (13.5950 grams/cubic centimeters) X (76.00 centimeters) X (980.665 centimeters/seconds squared)=1,013,242 grams/centimeter-seconds squared=101,324 Newton/meters squared=101,324 Pascals=2,116 lbs/square feet=14.70 lbs/square inch. Here is some pressure unit conversion information.

 

1 Bar equals 14.5 psi. which equals 750 torr, which equals 750mm Hg, (millimeters of mercury in a Torricelli Barometer which equals 29.5275 inches of mercury, which equals 100,000 Pascals, or 100 kPa.

 

A pressure equivalent to that exerted by exactly 760mm of mercury at exactly 0 degrees Celsius, under standard gravity is defined to be 1 atmosphere.

 

1 atmosphere equals 14.70 psi (pounds per square inch), which equals 1.013 Bar, which equals 760 mm of Hg, which equals 29.9212 in Hg, which equals 406.8 inches of water.

 

 

So i guess your boost gauge reads mm of mercury.

 

:D

Just to add. waht is Hg please Scott.

Just to add. waht is Hg please Scott.

 

Mercury

ie, +7 = roughly 13.8psi if ive calculated that correctly

ie, +7 = roughly 13.8psi if ive calculated that correctly

 

Thanks bud.

A value of 1 atmosphere (1 atm) is equal to the density of mercury times the height of the mercury in the tube minus the height of the mercury in the dish, times standard gravity and assuming a temperature of 0 degrees Celsius. (Standard gravity equals 32.174 feet/seconds squared or 980.665 centimeters/seconds squared) (Density of mercury at 0 degrees Celsius equals 13.59050 grams/cubic centimeters) .

 

Therefore 1 atm = (13.5950 grams/cubic centimeters) X (76.00 centimeters) X (980.665 centimeters/seconds squared)=1,013,242 grams/centimeter-seconds squared=101,324 Newton/meters squared=101,324 Pascals=2,116 lbs/square feet=14.70 lbs/square inch. Here is some pressure unit conversion information.

 

1 Bar equals 14.5 psi. which equals 750 torr, which equals 750mm Hg, (millimeters of mercury in a Torricelli Barometer which equals 29.5275 inches of mercury, which equals 100,000 Pascals, or 100 kPa.

 

A pressure equivalent to that exerted by exactly 760mm of mercury at exactly 0 degrees Celsius, under standard gravity is defined to be 1 atmosphere.

 

1 atmosphere equals 14.70 psi (pounds per square inch), which equals 1.013 Bar, which equals 760 mm of Hg, which equals 29.9212 in Hg, which equals 406.8 inches of water.

 

 

So i guess your boost gauge reads mm of mercury.

 

:D

 

FFS. all this happens as a result of you pushing the pedal on the right. LOL. again tyhanks mate. I will copy and paste thet info for future reference. :bow:

FFS. all this happens as a result of you pushing the pedal on the right. LOL. again tyhanks mate. I will copy and paste thet info for future reference. :bow:

 

just get a gauge that reads in psi lol.

just get a gauge that reads in psi lol.

 

That my friend sounds like a bleeding good idea.. :bow:

 

But its nice to know the facts.

That my friend sounds like a bleeding good idea.. :bow:

 

But its nice to know the facts.

 

pmsl. Check out Chris's 14 days of xmas. special price on gauges on Nov 30th ;)

http://auto.howstuffworks.com/turbo.htm

 

this is really for kids but has some very useful information

pmsl. Check out Chris's 14 days of xmas. special price on gauges on Nov 30th ;)

 

I tell you what mate whilst on the subject. I saw Vinz's pod on top of hes centre console and thats what I want to do with mine. I havent been able to find one so i am thinking of making one up from somthing I did see Chris' but I can get them for £32 at my local custom shop in different types. So I will probably go for those. What I want is boost oil and time clocks. Might even go for the item that goes in the other radio slot but Luke told me that aint the best place to have your clocks? I really dont like the door pillar ones to be honest. every thing must have its own place in my fast place??? :hyper: :D