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Turbo Upgrade for VG30DETT

Fuel Suply
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My Z32 TwinTurbo 2+2
Nismo and Border injectors
n550_b850.jpg
Nismo 550cc and Border 850cc injectors
Stock injectors for VG30DETT is top feed 370cc. At 3 bar fuel pressure, they max out around 350rwhp or 400bhp. More power might be realized by raising fuel pressure.
 
555cc injectors are good for 500-530rwhp safely at stock fuel pressure.
720cc and 740cc are good for 700+rwhp. Nissmo no longer makes 720cc. 740cc injectors will fit on 94+ Zs.
 
Another alternative is Border 850cc fuel kit. Good for 800+rwhp. Comes with billet fuel rail and fittings.
I personally wound not recommend RC engineering's bored out injectors. They have been known to leak under raised fuel pressure. Besides, I wouldn't push/bore the stock 370cc too far.
 
Stock fuel line/pump is good for 600rwhp. To achieve more hp, both will need to be changed. Stock TT fuel pump is rated 255ltr/hr.
 

Fuel-HP chart

Liters Gallons Lbs. of
Fuel
HP
155
41
246
491
190
50
301
600
255
67
404
800
 
 
How big of a fuel pump do you need?
 
Fuel needed=(size of injector) x (number of injectors) x (injector duty cycle)
 
For example, if you have 850cc injector in our V6 VG30DETT engine and you don't want more than injectors to be on open more than 80% of the time,
 
Fuel = (.850liter/minute) x 6 x 0.80 = 4.08 liter/minute = 245 liter/hour
 
Finally, as fuel pressure increases, fuel pump flow rate decrease for most pumps. It's a linear decrease. The rate depends on the specific pump. 
 
 
Upgrade your fuel pump
 
Test results have shown, stock Z32TT fuel pump can flow enough for 700+hp at 14volt. However the flow rate drops off at higher pressure. If you are running close to 700hp or more at higher boost level, it's probably safe to upgrade your fuel pump.
Skyline GTR fuel pump
fuelpump.jpg
BNR33 fuel pump
 
Available options
 
There's no known single intank fuel pump that flows significantly more than stock Z32TT pump. The Skyline R32 and R33 pump are still rated 255 ltr/hr. Same as stock pump. Probably not worth doing the swap.
 
If you want to keep the noise level down, there're Walbro 190ltr/hr (200 series), 255ltr/hr pumps (300 series) and 255ltr/hr hi pressure pumps (340 series). They are compact enough that you can put two of them in the tank. It will require some fabrication work. But it can be done.
 
Walbro pumps At 12 Volt:
 
Pressure
(psi)
190 ltr/hr
fuel pump
(gal/hr)
190 ltr/hr
fuel pump
(amps)
255 ltr/hr
fuel pump
(gal/hr)
255 ltr/hr
fuel pump
(amps)
"high pressure"
255 ltr/hr pump
(gal/hr)
"high pressure"
255 ltr/hr pump
(amps)
0 56 2.6 75 4.7 76 4.4
10 52 3.2 72 5.2 73 4.8
20 48 4.0 67 6.1 68 5.5
30 44 4.8 63 7.2 63 6.3
40 40 5.7 58 8.3 59 7.1
50 36 6.6 54 9.4 54 8.0
60 32 7.6 49 10.6 50 8.9
70 28 8.6 40 11.8 45 9.8
80 22 9.7 29 13.3 37 10.8
90 12 10.8 0 14.6 27 11.8
100 0 12.5     11 12.9
110         1 13.9
 
Walbro pumps At 13.5 Volt:
 
Pressure
(psi)
190 ltr/hr
fuel pump
(gal/hr)
190 ltr/hr
fuel pump
(amps)
255 ltr/hr
fuel pump
(gal/hr)
255 ltr/hr
fuel pump
(amps)
"high pressure"
255 ltr/hr pump
(gal/hr)
"high pressure"
255 ltr/hr pump
(amps)
0 64 3.1 83 5.5 84 5.1
10 61 3.5 81 5.8 82 5.4
20 57 4.2 77 6.7 78 6.1
30 53 5.0 72 7.7 73 6.8
40 50 5.8 68 8.8 68 7.6
50 46 6.6 64 9.8 64 8.4
60 43 7.5 58 10.9 59 9.2
70 39 8.4 51 12.0 55 10.1
80 32 9.4 39 13.2 46 10.9
90 23 10.3 12 14.4 38 11.9
100 15 11.5 1 15.3 19 12.9
110 0 12.7     9 14.0
Weldon fuel pump
Weldon fuel pump

 
 
 
 
 
 
 
There're aftermarket external pumps that flow more than 1000hp at high pressure level. For the lack of test data and feeback, I'll only talk about the Weldon pumps here.
 
Weldon 2015A and 2025A will probably flow enough fuel for any applications. 2035A is not a continueous duty pump. It is not suitable to use on the street or road course.
 
 

Weldon 2015A flow chart
2015-chart.gif

Weldon 2025A flow chart
2025-chart.gif

Bosch fuel pumps
bosch fuel pumps

 
 
 
Another route is using twin inline Bosch pumps which is my fuel setup. Bosch pumps are physically bigger than Walbro 300 series pumps, the reason that the Bosch pumps don't drop off much at high pressure level unlike most other fuel pumps.
 
 
 
 

BOSCH
(10208,10209,10210) at 13.2v
WALBRO
GSS-341 at 13.5v
Pressure GPH Amps GPH Amps
0 66 5.5 86 5.0
20 62 6.9 79 6.1
50 54 8.7 65 8.5
70 50 10.0 57 10.2
100 43 11.7 34 13.2
120 33 13.0 12 15.5

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