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Discussion Starter #1
The limited-edition VXR500 is based on the standard 6.0-litre Monaro VXR, but uses forced induction to take the power from 403 to 500PS and torque up from 530Nm to a massive 677Nm. In addition to the positive displacement supercharger, the conversion also includes an upgraded fuel system, clutch revisions and bespoke engine tune.
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I wonder how the fuel system was upgraded, and if it would be a drop in replacement that would be compatible with our US LS2's, and how much HP could it handle? It could be a nice option for people to upgrade their fuel system here that have or are planning on getting a supercharger.

Anybody know, or would be able to find out the specifics?
 

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Discussion Starter #2
lanceygto said:
For a fuel pump: Horsepower = Flowrate / BSFC

where flow is the fuel pump flow in lb/hr. if you hav eflow in galons per hour then you multiply it by 6 to get it into lb/hr.

Similarily: Flow = HP X BSFC

where BSFC can be taken as .55 for a supercharged engine then for 500 hp your fuel pump must be able to push 275 lb/hr which divided by 6 it means that your fuel pump must push almost 46 gallons of fuel per hour.

The fuel injectors follow the following formula:

HP = (Flow rate X # injectors X Maxcycle) / BSFC

Flow rate = (HP X BSFC) / (# injectors X Maxcycle)

FR = (500 X 0.55) / (8 x 0.80) = 43 lb/hr injectors or injectors that may flow slightly over 7 gls of fuel every hour at 80% duty cycle

All of that is assuming a BSFC of 0.55 for a FI system. N/A systems may assume 0.45 instead and the numbers will change.


All of that is not because I am no expert. I am just doing some reading and learning. If I am wrong please correct me.

Thanks for the formula, although I was really wondering if anyone had knowledge of the specifics of the fuel upgrades for the VXR and what the specs were, and if the upgrade fuel components could be a drop in replacement for our US LS2 cars? For example, if there using a better flowing fuel pump that could be a direct replacement. I think that would be awesome. Maybe some of our Aussie and UK friends might be able to find this out?
 

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Discussion Starter #4
lanceygto said:
LOL, I know but since nobody was posting answers I felt iy is the least I could do.
Yeah, I know. I thought more people would be interested in this seeing as how these cars have fuel limitations above 500whp (before I get flamed, I know there are people out there making more with just injectors and BAP's, but generally speaking of course). And the thought of a drop in replacement for a fuel pump to me sounds pretty exciting. Your formula though is still apreciated. It is some nice info to know.
 

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dum dum dum dum dudum
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6,217 Posts
Now the question is do those VXRs have the tank behind the passenger or in the spare tire well?
 

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Harrop GTO, HTV2300 680rwhp
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We do an upgrade kit that inserts an addition in-tank pump. We then run an additional (OE) fuel line and feed each fuel rail and equalise the pressures through a balance tube. It is totally transparent and as quiet as the OE system, easily supporting 700hp from a blown 402ci.
The only issue is the difficulty of installing the extra fuel line ... easiest with the motor out.
 
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