boost settings
Turbo Mini Forums

ive fitted a bleed valve and have the boost running just under 4 on my guage which reads in KM/CM'2, ive worked out that that 7psi is 4.9 on this guage,think you have to devide the boost you wanna run at by 0.070 (please correct me if im wrong) is it safe to run it at 7psi and will there be alot of difference in power?

does anybody know what just under 4 is on this guage in psi? ive turned it up a little as it was running at around 4psi. im ganna turn it up soon but am waiting to get a decent guage that reads psi.

thanks


ps. its a standard turbo 1275

7psi is fine on a std engine. should then make the 90 odd its supposed to make. it was limited mid range to save the gearbox from the extra torque.

mini spares for the gauge 0 to 30 psi
52mm dia

one Bar = 14.504 PSI

you can boost up to say 10psi ish" with the standard compression with a small margin for saftey if you run optimax fuel, above that on a warm day you may well run into trouble with Detonation

the loud metalic sound "pinking" if you hear this ease of with the foot as your engins life is threatend. i have been there !

i would not go over 10 psi with out a intercooler and lowering the compression
ie easy way is to remove the beak out of the combustion chamer this should bring a 1275 to around to 8:5:1 cr and safe for 14psi of boost.
with an intercooler 16 psi ish" if the btm end can stand it?

but dont take it for granted its only a guide through my own experiences
and i may stand corrected !

'This information is offered on an ?as is? basis and without warranty of any kind, either expressed or implied. Furthermore, neither I nor Turbominis.co.uk shall be liable for any damages, either directly or indirectly arising out of the use of this information. This includes but not limited to, loss of life, gear tooth loss, monitary hardship, or consequential damages resulting from the use or misuse of the information.'

1 bar = 14.7 PSI

Alex

AlexF

my guage doesnt read bar, it reads kg/cm2.

thats why im ganna get a guage that reads psi as i dont wanna turn it up anymore unless im sure what its going up to

1 bar = 1.019716 kg/cm2

or 1 bar is 1 kg per cm2

:)

alex

AlexF

7 pound-force/square inch (PSI) = 0.4921487 kilogram-force/square centimeter

thats a new one on me mike the warning
quote:
'This information is offered on an ?as is? basis and without warranty of any kind, either expressed or implied. Furthermore, neither I nor Turbominis.co.uk shall be liable for any damages, either directly or indirectly arising out of the use of this information. This includes but not limited to, loss of life, gear tooth loss, monitary hardship, or consequential damages resulting from the use or misuse of the information.


ALEX:
Remember your physical sciences. . . the weight of the earth's atmosphere pressing down on us constitutes atmospheric pressure and is 14.7 "pounds per square inch"
Generally we ignore this 14.7 PSI of atmospheric pressure.

An example is when we put 30 pounds (per square inch) of air into a tire. We put 30 pounds more than the 15 pounds into the tire.

The gauge ignores the 15 pounds and indicates 30 PSIG. The PSIG refers to "pounds per square inch gauge" and what we usually think. Pressures less than atmospheric are negative gauge pressures that correspond to partial vacuums. If the tire gauge took into account the atmospheric pressure it would be an absolute pressure gauge and would read 45 PSIA "pounds per square inch absolute."

Absolute pressure is the total pressure including the effect of atmospheric pressure. An absolute pressure of 0 corresponds to a complete vacuum. Atmospheric pressure is 1.01 BAR.

The BAR gauge is an absolute pressure gauge and it takes into account the atmospheric pressure. It is an international unit of pressure that is used in most countries. It is equal to 14.5 PSIA or approximately 1 atmosphere.

Edited by BENROSS on 9th Feb, 2005.

lol, doesnt sound right does it

//... i'll get me coat...

Edited by Mike on 9th Feb, 2005.

Ok so im running just under 4 kg/cm2 on my gauge,whats that roughly in psi?? is there alot of difference in power when turning up from what im at,to 7psi????

4 kg/cm2 is like 56psi...

y thats right, soz i got them back to front above.

4 kilogram-force/square centimeter = 56.8933733 pound-force/square inch (PSI)

OK IM CONFUSED!! how much psi am i running?? its just under 4 on me guage,which is kg/cm2 on it, or the other way round, my dad worked out that to run 7psi the gauge would have to read 4.9 right??????

so is it running just under 6psi??? thats how i look at it,unless i got the wrong end of the stick :-

as above... 4 kg/cm2 is nearly 57PSI :S

nah that cant be right, the bleed valve is only undone a little, hmmmmm

i dont think thats the full formula,as youve gotta times it by something too,its in the back of the haynes manual,the formulas n that

u sure your reading the dial right? cos the conversion is correct.

follow the link,its a pic to the guage im using

http://www.speeding.co.uk/acatalog/tim127.JPG

try putting .4 in that conversion thing your using,i think its around 5/6psi.

thats in bar.

so 1.0 bar = 14.7psi

therefore run roughly 0.5bar and you will be fine.

//GROAN.. u said FOUR!!!! lol

hehe you got me worried then!! so, the needle gets to a certain point where it wont go any further,which is just under .4 on the guage.. what psi roughly is that AND will boosting it up another 1psi to 7psi make a noticable difference in power??

cheers guys

*bashes head on table*