EFI - trick progect

[Sergey Stopov]

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.

 















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