M800 questions

[stevieturbo]

A Quick query James.

It sounds like you hope to push quite hard with this...and use E85.

What injectors do you intend using with the M800 pnp ??

As I found out myself.....you cannot run low impedance injectors directly off a pnp unit. High impedance will limit you to around 1000cc at present. Which isnt huge for E85 fuel.

[07-EDM-STI]

A Quick query James.

It sounds like you hope to push quite hard with this...and use E85.

What injectors do you intend using with the M800 pnp ??

As I found out myself.....you cannot run low impedance injectors directly off a pnp unit. High impedance will limit you to around 1000cc at present. Which isnt huge for E85 fuel.

Hi Stevie,

I'm planning to use DW 1600cc/min injectors. I just found it out myself when I got the motec package that the M800 PnP can't use low impedance injectors. The DW 1600 has the optional resistors and I ordered it too. It's a top feed injector but uses the side feed TGV. I ended up buying 04-06 STi APS TGV. I will also use twin Walbro setup for my fuel pump.

Btw there is a thread in nasioc about Bosch injectors, I believe it's 1000cc/min injectors but flows higher with high fuel pressure

http://forums.nasioc.com/forums/showthr ... ?t=1702099

http://forums.nasioc.com/forums/showthr ... 099&page=4

1525cc/min at 100 psi of fuel pressure. The problem I see with that is the fuel pump can't supply enough fuel at 100 psi, only a very few fuel pump can do it. A twin bosch 044 or 041 might do it.

[stevieturbo]

The Bosch EV14's are supposed to be very good...but you can only compensate so much with fuel pressure.


If you intend to use low impedance, buy a proper driver box like FJO sell. They do a 4 channel unit.

I doubt two Walbro's would cope...and they also dont cope well at high pressures.

A pair of 044's would be a better choice. I flow tested my own 044's, through a -6 line, 60psi at 13.1 volts.

They flowed equivalent to 486litres per hour ( tested for 20 seconds ) Voltage made quite a difference..my first tests were at 12.0volts. Dont recall exact results though.

I'd guess at 14.0 volts, it would be over 500lph. They also keep flowing til over 100psi....the Walbros taoil off a lot over 70psi.

[07-EDM-STI]

The Bosch EV14's are supposed to be very good...but you can only compensate so much with fuel pressure.


If you intend to use low impedance, buy a proper driver box like FJO sell. They do a 4 channel unit.

I doubt two Walbro's would cope...and they also dont cope well at high pressures.

A pair of 044's would be a better choice. I flow tested my own 044's, through a -6 line, 60psi at 13.1 volts.

They flowed equivalent to 486litres per hour ( tested for 20 seconds ) Voltage made quite a difference..my first tests were at 12.0volts. Dont recall exact results though.

I'd guess at 14.0 volts, it would be over 500lph. They also keep flowing til over 100psi....the Walbros taoil off a lot over 70psi.

Hi Stevie,

can you give me a direct link to the FJO driver box? It''s really hard for me to search for parts ouside of US, and shipping is a bit of a problem too.

I think twin walbro can flow up around 90 gal/hr at around 70 or 75 psi IIRC. I hope the DW 1600 will flow real 1600cc/min at 70 psi, I will try to find a nice setup if I will run static or dynamic fuel pressure.

If I just have the money right now, I might give the weldon pump a try and have a surge tank too, but at this point I can't afford it plus running a surge tank can eat up a lot of space in my trunk. I'm thinking of a way how to have a surge tank and a weldon fuel pump at the engine bay, and hopefully a fuel cooler in front of the car.

I also read somewhere that the bosch 044 is not alcohol compatible, so is walbro but there's a thread in nasioc about E85 and the guy uses walbro w/o a problem. so bosch 044 might be able to take alcohol fuels too.

thanks again for the suggestions, it's really opening up my options

[stevieturbo]

http://www.fjoracing.com/products/injdrvr/

pm on its way

[07-EDM-STI]

I have another M800 question

Since I'll remove my MAF sensor and will put AC DELCO IAT sensor instead, can I connect a 0-5V input from a sensor to the "middle" wire of the MAF sensor connector? I'm thinking of connecting the output of a fuel pressure sensor 0-5V to the "middle" wire and I want to know if the M800 can be configured to treat the signal as pressure sensor, in any event that the fuel pressure drops at high boost, the ecu will react to lower the boost and rpm. Thanks in advance

[stevieturbo]

Yes I'm sure you can.

Dont forget that if using the base map, to adjust the main load paramaters to MAP instead of a MAP/MAF combo when you do remove the airflow meter.