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PaulH

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1346 Posts
Member #: 2340
Post Whore

Dublin Ireland

17th Apr, 2009 at 10:24:02pm

Ok have been at this all week and now my brain hurts.

The figures I have used to work out my presure ratio and Lb/min:
HP : 200
Displacement: 1380cc
Max rpm : 7500
VE : 85% (maby a bit optimistic for a 5 port)
AIT: 100 deg F
BSFC: .50
AFR 12:1 (Hif 44)

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What I came out with is -
Wa : 22
MAP corrected : 15 psi
MAP Absolute: 29.36
P1c: 13psi
P2c: 17psi
IIc: 1.30


The two things Im stuck on:

is Wa my corrected Air flow

and does a Presure ratio of 1.30 sound right for this spec ?

Edited by PaulH on 17th Apr, 2009.

On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers.

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Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

17th Apr, 2009 at 10:37:49pm

personally, i just use this,

http://www.motorgeek.com/index.php?page=6

try to find a known poer output to "calibrate" and go from there.

also your VE may be slightly optimistic, but i think you can lower the bsfc to the .45 area, prhaps as low as ,42 on a low boost high cr engiune

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



PaulH

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1346 Posts
Member #: 2340
Post Whore

Dublin Ireland

17th Apr, 2009 at 10:48:54pm

What an Awesome sight thanks a bunch dood

On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers.

______________________________________________________

Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

17th Apr, 2009 at 11:03:52pm

no probs :)

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Kean

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2406 Posts
Member #: 341
aka T2clubby

South Staffs

17th Apr, 2009 at 11:09:19pm

Wa is your airflow, and I think the pressure ratio will be more like 2.3...


PaulH

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1346 Posts
Member #: 2340
Post Whore

Dublin Ireland

18th Apr, 2009 at 12:21:20am

Ya T2 I Think your right but I'm nearly sure it should be Mid 2.3, Ill have to go back over my calcs tommrrow.
I think the air flow is 22 Lb/min

On 17th Feb, 2009 Rob H said:
I find the easiest way is to super glue the bolt to the end of one of my fingers.

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