and will this be adequate enough for the hrc kit???

It is unlikely that any common in-tank replacement pump will be able to supply adequate fuel for 9 psi boost at 110 psi of fuel pressure. Most of those pumps are built to flow alot of fuel, but at lower pressures-like 70 psi and below. If you have big injectors and can run lower fuel pressures this is fine. If you have stock injectors and run high fuel pressures, you'll have to be careful. I wouldn't buy any pump until you saw the pump characteristic curve. Like this:



Corbin
'95 ESI-T
HRC + FMIC

Corbin
'97 GSX dressed like a '95 ESi

The stock VR-4 fuel pump handles 14psi boost with that massive twin turbo engine. It can handle a LOT of pressure but that car also has bigger injecters.

Robert Parkhurst
toykilla@comcast.net

the vr-4 pump is substantially bigger than the stock 2gnt pump, and will take customizations to fit......at all. plus, I think that is one fo the weaker pumps availale in that size (as is everything abotu the vr-4 fuel system). the supra, or the japanese masda cozmo pump(relabled my such companies as HKS) flo wmuch more, and will be closer to what you need, but I dont' think either will support the crazey pressures needed to squirt enough gas through 235 cc injectors.

Is the FMU come with HRC kit 12:1?? If so I don't think vr-4 can handle the fuel high pressure.

The HRC FPR is likely not a 12:1. It only needs to be around 7:1 for 9 psi boost. I bet its in the 7-8:1 range.


Corbin
'95 ESI-T
HRC + FMIC

Corbin
'97 GSX dressed like a '95 ESi

how much boost can the HRC fuel supply handle on stock injectors? I have heard people have idle problem with large injectors. I remember seeing someone said he has 440cc, and the idle was bad even with SAFC lean out 50%. is there any solution?

You would not want to run any more than 9 psi boost on stock injectors. That requires 105-110 psi of fuel pressure. Anything over 100 psi has questionable safety (according to many sources,including RC Eng.).

On the topic of bigger injectors. 440's will work fine with an adjustable FPR and S-AFC. My fuel pressure at full vacuum (idle) is 26 psi with the S-AFC at -40%. The idle quality is perfect and I am injecting the perfect amount of fuel for complete combustion (according to the datalogger). This is all under closed-loop operation (normal driving). My open-loop (WOT) settings are way rich; just because I've been too busy to tune them. So, with the proper fuel pressure and S-AFC settings, you can make some pretty big injectors work.


Corbin
'95 ESI-T
HRC + FMIC

Corbin
'97 GSX dressed like a '95 ESi