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oldcorollas
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
 
Re: Leaning out problem.... Sun, 17 July 2005 16:42 Go to previous messageGo to previous message
as far as fuel pump goes, is it a 255 or a 255 high pressure?
http://www.supras.nl/index.php?option=com_content& amp; amp;task=view&id=49&Itemid=65

http://www.autoperformanceengineering.com/html/fps pecs.html
some links regarding flow rates.. they do drop a fair bit at higher pressures, however 60psi should be ok for 189L/hr and 197 for the HP version..

damper should not hinder flow, it just removes the "fuel hammer" as such... sicne the reg flows most at idle, it can't be a restriction, but maybe it is not increasing pressure enough at WOT (as Norbs is suggesting)

what are the injectors capable of??
from a quick calc, with 16-17psi boost and 400cc injectors (and 12:1AFR), you will have 100% duty at approx 5500rpm...
for 7000rpm, you need about 480cc/min injectors..(edit, MAXED.. 80% duty = 600cc/min... maybe injectors are becoming erratic in operation? Norbie, what injectors are you running?)

this is rough calcs tho, but but... ideas...
now, 400ccx6 = 2.4L/min = 144L/hr
480x6 = 2.88L/min = 172L/Hr

the walbro pump should support 17psi at 7000rpm wth maxed out 480cc injectors...just.. infact it should barely support 100% duty of 525cc injectors with no fuel return, and 660cc/min at 80% duty..





[Updated on: Sun, 17 July 2005 16:44]

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SubjectPosterDate
Read Message   Leaning out problem.... SouthoSun, 17 July 2005 02:16
Read Message   Re: Leaning out problem.... NorbieSun, 17 July 2005 07:45
Read Message   Re: Leaning out problem.... SouthoSun, 17 July 2005 14:38
Read Message   Re: Leaning out problem....  oldcorollasSun, 17 July 2005 16:42
Read Message   Re: Leaning out problem.... NorbieMon, 18 July 2005 04:04
Read Message   Re: Leaning out problem.... Chris DaveySun, 17 July 2005 23:25
Read Message   Re: Leaning out problem.... SouthoMon, 18 July 2005 01:45
Read Message   woo hoo - 245kW - Leaning out problem....fixed....:) SouthoMon, 25 July 2005 09:58
Read Message   Re: Leaning out problem.... sideshowMon, 25 July 2005 10:04
Read Message   Re: Leaning out problem.... SouthoMon, 25 July 2005 13:21
Read Message   Re: Leaning out problem.... NorbieTue, 26 July 2005 00:23
Read Message   Re: Leaning out problem.... SouthoTue, 26 July 2005 01:47
Read Message   Re: Leaning out problem.... NorbieTue, 26 July 2005 01:56
Read Message   Re: Leaning out problem.... SouthoTue, 26 July 2005 02:27
Read Message   Re: Leaning out problem.... MS-75Tue, 26 July 2005 10:06
Read Message   Re: Leaning out problem.... sideshowTue, 26 July 2005 11:34
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