EFI - trick progect
Sergey Stopov
efi335 at hotmail.com
Fri Oct 2 06:26:37 GMT 1998
Hi Guys!
Your advise is needed!
Now my friend wont make turbo on him BMW540 with boost 2 bar.
And hi do not wont change ECU parameters.
I offer to him some upgrade to EFI.
In parallel to MAF install tree electric-drive throttles T1, T2, T3 and
3 injectors J1,J2,J3 (supplied by own OEM fuel pump and own OEM press.
regulator) that fires on OEM throttle every crank rotation with pulse
width that OEM ECU determine for standard injectors.
F - fuel performance of set (8 unit) of OEM injectors.
S - squares of MAF air flow. And (1.26) ^ 3 = 2
P - manifold press.
F( i ) - fuel performance of J( i )
Squares of these throttles will be:
S(T1) = 1.26S - S = 0.26*S
S(T2) = (1.26*1.26)S - S - S(T1) = 0.33*S
S(T3) = 2*S - S - S(T1) - S(T2) = 0.41*S
F(J1) = 0.26*F F(J2) = 0.33*F F(J3) = 0.41*F
J(i) may be one injector or group of injectors for getting calculated
fuel requirement.
T1 open when P = 1.15 bar off when P=1.11 bar
T2 P = 1.45
P=1.39
T3 P = 1.82
P=1.75
J(i) fires when T(i) is open.
Thus on idle, cruse or when P < 1.15 bar EFI works as standard one.
But when boost grow fuel supplement grow up too but ECU not «think»
that MAF signal too high for these throttle position and rpm.
Example:
on boost P=2 bar and WOT, air flow throw MAF will be: 2*(standart
flow), and 0.5 will flowing throw MAF and 0.5 flowing throw T1,T2,T3
because S(MAF) = S(T1)+S(T2)+S(T3); And fuel quantity will be:
2*(standard fuel flow) because all J(i) will be working.
And ECU will obtaining signals as in OEM system without turbo.
Number of addition throttles may be high (4,5,....), but in case 3 add.
throttles maximum mistake of MAF signal will < 12....15 %.
What you think about it.
Did you hear about system look likes it.
Your opinion very important for me and my friend!
Sergey Stopov.
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
More information about the Diy_efi
mailing list