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Posted: Mon Feb 04, 2008 10:21 pm
by Coops
once paypal sorts its self out and excepts my payment i'll order the bosch green 42lb ones from fiveomotorsport
Posted: Tue Feb 05, 2008 8:18 pm
by Coops
Posted: Tue Feb 05, 2008 8:40 pm
by stevieturbo
yup
Posted: Tue Feb 05, 2008 8:42 pm
by Coops
cheers stevie,
mmmm whats next to do now
done the pump, now the injectors, changed ecu, anything else?
Posted: Tue Feb 05, 2008 8:53 pm
by katanaman
Chevy LSx?
Posted: Tue Feb 05, 2008 8:56 pm
by Coops
katanaman wrote:Chevy LSx?
ooooooooooooo marki i wish mate
Posted: Tue Feb 05, 2008 8:57 pm
by stevieturbo
fuel lines, map sensor, boost pipes, turbo...ummmmmm gearbox, clutch lol
Posted: Tue Feb 05, 2008 8:59 pm
by Coops
Posted: Thu Feb 07, 2008 1:57 am
by Coops
just to make sure i got this right,
my req fuel will be this yeah?
I injector flowrate (cc/min)
( 440 )
D engine displacement (cc)
( 3947 )
N number of injectors (piece, eg. 4 for a 4 cyl port injection)
( 8 )
Simplified equation is: req_fuel = 6.49 * D / N / I
so 6.49*3947/8/440 =7.277 (7.3)
i have got that right aint i
Posted: Thu Feb 07, 2008 6:29 pm
by stevieturbo
Where have you got the equation from ?
using the online stuff on RCeng's site is easier. Takes less thinking
Posted: Thu Feb 07, 2008 6:44 pm
by r2d2hp
Using the RCEng guide based on 300bhp it works out that you need 23Ib injectors. I assume this is based on the injectors being able to meet all the demands on the engine supplying max power continuously
I also read that running injector that are too large can effect tick over and slow running, is that correct.
Posted: Thu Feb 07, 2008 6:51 pm
by Coops
stevieturbo wrote:Where have you got the equation from ?
using the online stuff on RCeng's site is easier. Takes less thinking
here mate:
http://www.vems-group.org/wiki/index.ph ... torOpening
Posted: Thu Feb 07, 2008 7:10 pm
by stevieturbo
But what is the equation trying to do ?
Whats it trying to prove ? Is it something specific to the needs of the VEMS ? or a general equation ?
Dont forget, that equation ...
Assume
* fuel density=0.755 g/cc
* AFR=14.7 at stoich
* intake air density = 0.0012 g/cc (at MAP=100 kPa, which might be a cheat from the real 101..104kPa ?)
* (alternate+1)*divider = N (see N below)
It isnt calculating a general injector sizing question.
Posted: Thu Feb 07, 2008 7:17 pm
by dnb
stevieturbo wrote:Where have you got the equation from ?
It's just to set the base pulsewidth for the ECU. Probably best to use the equation as-is
BTW Tony - are you going to wire the injectors in batches of 2 now they're bigger (instead of the batches of 4)
Posted: Thu Feb 07, 2008 7:32 pm
by Coops
not sure Dave,
what would you recomend?
does it need to be done that way now then???????
and is there a diagram of it mate???
