Where did the value of 480cc come from? Apexi have them as 448cc in the PowerFC manual.
Where did the value of 480cc come from? Apexi have them as 448cc in the PowerFC manual.
Heres one link.
http://www.200sx.net/
hmm interesting. Found this as well.
http://www.nissansilvia.co.nz/tech/S...SX%20Table.htm
They cant all be wrong can they? Are there any markings on injectors that identify their size?
Last edited by Meddy; 11-10-2005 at 12:42.
are u talking about what size S15 injectors are??cuz they are 480
Well, thats seems to be incorrect as Apexi say otherwise...Originally Posted by sushiming
I shall correct myself I was told they were 480cc injectors ....I will check now
But who is to say that THEY are right?
a previous thread from here.
http://www.sxoc.com/vbb/showthread.php?t=132104
Im pretty convinced the PFc booklet is a typo.
Interesting reply from nissansilvia.com.
they're specified as 480cc by Nissan, but that's using the new standard pressure (3.55bar from memory)
At 3 bar, where all the older injectors were measured, the S15 injectors flow 448cc.
So, if you're calculating anything with the S15 injectors vs older ones, use 448cc
that would explain why i could feel the difference as soon as my walbro was fitted, very very noticable
A walbro doesn't alter the fuel pressure significantly, such that you'd notice due to that alone. The pressure is control by the Fuel pressure regulator on the end of the fuel rail
Pressure should stay the same std pump or walbro. Its just that the walbro can supply more fuel at that pressure per hour
Yep, sounds more like your original pump may have been on its way out...
I stand corrected.
Allthough it would be interesting to know why they changed the test pressure, as the flow of the injectors to a point is going to be dependent on the pressure the liquid flowing through them is at. Is the 3 Bar the new industry standard? Also if this is the case how come the S14 flow rate remains unchanged at 370? Just interested thats all.
Would this also effect the flow if we were to fit say 740's, would they actually flow at around 700 instead??
I'm not entirely convinced myself. And no, the ratings on 555s and 740 are at the 3 bar rate. Which is why its a bit confusing why Nissan would state a higher rate. This would put 555s up to around 600 and 740 up to 800.
after i had put all my mods on i did a power run and it showed fueling was bad, so i got a walbro and the minute it was fitted it felt smother pulled harder and generally drove better, but you probably right my pump was probably on its way to fuel pump heaven
So then, did Nissan also uprate the fuel pressure reg in the S15 to give an equivalent of 480cc???
I thought Matt_S invented SXOC
No, exactly the same part number.
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