boost

[Junglist]

Hi all , just a quicky

on the standard dash turbo gauge my car boosts to the center of the B , does any one know what psi this would be,,
my aftermarket gauge is saying 10psi but its dodgey :crap:

thanks in advance Dan ;)

[RICHIE]

bar psi

a 0.55 8.25
B 0.65 9.75
C 0.7 10.5
D 0.8 12.0
E 0.9 13.5

[Junglist]

a 0.55 8.25

B 0.65 9.75
C 0.7 10.5
D 0.8 12.0

E 0.9 13.5


? you lost me

[Junglist]

:)

[Mart]

There was a picture knocking around of a gtt dash boost gauge showing pressure (@ carb top) against the increment dashes.

I'll see if I can find it, although given the gauges are getting on for 20+ years old now, I'd take the readings with a pinch of salt.

[RICHIE]

There was a picture knocking around of a gtt dash boost gauge showing pressure (@ carb top) against the increment dashes.

I'll see if I can find it, although given the gauges are getting on for 20+ years old now, I'd take the readings with a pinch of salt.

its in my profile im trying to upload it

[James5]

http://emob252.photobucket.com/albums/hh25/GTTJames/Standardboostgaugepsimarkings.jpg

not sure if this link worked copy and paste on itouch :eek:

[RICHIE]

http://i194.photobucket.com/albums/z205/RICHIE0800/BOOSTGAUGE.jpg

[Mart]

That's the one. Cheers chaps :agree:

If the needle/graph is to be believed, you'd be on the limits of o.e jetting around 'E'.

[Jimmy_GTT]

That's the one. Cheers chaps :agree:

If the needle/graph is to be believed, you'd be on the limits of o.e jetting around 'E'.


And if you increase boost to 1.0 - 1.2bar @ carb top what should be the first step modifying the carb? a/c and E2?

[Andrew Cooke]

And if you increase boost to 1.0 - 1.2bar @ carb top what should be the first step modifying the carb? a/c and E2?

how worn is your carb?

[Jimmy_GTT]

how worn is your carb?
It's in perfect condition. (at least I hope so ;) )
It was rebuilded about 10.000kms before.

[Mart]

And if you increase boost to 1.0 - 1.2bar @ carb top what should be the first step modifying the carb? a/c and E2?

Enrichment cct everytime. You don't need to alter off-boost fuelling, so no need to fudge those relevant jets.

If you're running a higher c/r and/or a more advanced ignition, then it's a different story of course.

[Junglist]

wow so for the last 6 years ive been running just less than 10psi ,, thats why the turbo has lasted then :agree: , still id like to turn it up slightly me thinks :smokin: sure just a couple of psi wont do any harm ?

and thanks for the chart guys :agree::agree:

[Jimmy_GTT]

Enrichment cct everytime. You don't need to alter off-boost fuelling, so no need to fudge those relevant jets.

If you're running a higher c/r and/or a more advanced ignition, then it's a different story of course.

Sorry, need help with english.
What is 'cct'?
You mean I only have to modify E2 and leave all other parts standard?

What about removing the choke flap? I can't use the car if it is on.

[Andrew Cooke]

It's in perfect condition. (at least I hope so ;) )
It was rebuilded about 10.000kms before.

did you replace all the jets and the emulsion tube?

[Jimmy_GTT]

did you replace all the jets and the emulsion tube?

Everything was cleaned and measured.
And I have an AFR/EGT in car and it shows good values. But currently I'm only running @0.8bar @carb top.

[Mart]

Sorry, need help with english.
What is 'cct'?
You mean I only have to modify E2 and leave all other parts standard?

What about removing the choke flap? I can't use the car if it is on.

cct - circuit.

The choke flap is a restriction to air-flow. Remove it. Every little helps.