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Old 12-07-2002, 19:56   #1 (permalink)
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Why cant you fit cam to CFI?

Just a query I have regarding installing a decent cam to a CFI EA Falcon...

I have been told by members on this board that it cant be done as the CFI wont idle properly...I was wondering why exactly is this so? The only things I can think of are fuel pressure/rate or manifold vacuum

The fuel situation could be sorted by using an XR6 fuel pump and Reg. couldnt it? or would it be too much for the low and high speed injectors to handle?

If thats the case then I'd say you would be able to buy higher rate fuel injectors

Does the CFI configuration produce less manifold vacuum at idle? If this was the reason then I am unsure as to how to overcome this....It hink the main reason cams arent available is not the fact thats its impossible, but more the fact that people dont bother as they see MPFI as superior...I dont know about the other CFI owners on this board...but I'd be proud to own a CFI which whooped a MPFI off the line!

Come on guys....put ya heads together and have a think...is there anything else stopping them from producing one? I dont really see the point in converting to MPFI if I could come up with a cheap way to retain the CFI setup and still get good performance gains...
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Old 12-07-2002, 20:20   #2 (permalink)
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We have tested a number of different profile cams in the cfi,the main reason we dont push it is that the gains were not good enough to market the cam.there is nothing worse than selling something to a customer that does no meet there expactations.if they didd not reach mine ,i dont think it is good enough to pass on to the consumer.
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Old 12-07-2002, 20:33   #3 (permalink)
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Thanks for the reply,
May I ask how small of a gain you encountered?
Is the poor idle rumour true?

you can send your reply to XmFoRdFaLcOn@austarnet.com.au if you prefer
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Old 12-08-2002, 17:25   #4 (permalink)
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Honestly, it would simply be more logical to do an MPI conversion.

Just by going to MPI, there will be a 20 kw gain, with more torque, and a better rev range. The idle will be smooth, and starting will be better if anything.

To get a 20 kW increase from just a cam alone is asking a bit much on an I6 without exhaust mods etc.

The bottom line, MPI will be cheaper, with a better result.
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Old 12-08-2002, 18:12   #5 (permalink)
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MPI is also more economical for the power produced (Y)
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Old 12-10-2002, 16:25   #6 (permalink)
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My EA ghia is MPFI. It is just standard at the moment, but it has better fuel economy than a friends CFI. It also has more power, but as for the beating a MPFI, What diff were you running? I have a 2.77 or whatever it is, which gives crap acceleration around town off the lights. however, kickdown at about 45 or so after the revs are up a bit and the ghia goes good. I would like to have better takeoff but i'll try and get more power out of my motor first. If I had CFI, i think i would be changing to MPFI before doing anything else. Your economy and power will be more to begin with...
This is just my opinion anyway.....
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Old 12-10-2002, 17:03   #7 (permalink)
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Yes I must agree that for $300 odd dollars for a cam that will give me less performance than a stock standard MPFI is not worth it.
I am going to look into converting to MPFI in the future as it will be a better base to start modding with cam, extractors, exhaust etc
The only thing I m worried about is the wiring...but there have been many guys on here who have converted so I am sure someone will be able to help me out....anyone have MPFI gear they wanna sell?
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Old 12-10-2002, 17:05   #8 (permalink)
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Wiring isn't an issue. Ive done a post before on the 1 wire that needs to be changed.
You should beable to get a cheap manifold etc off your father since he's a wrecker.
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Old 12-10-2002, 23:48   #9 (permalink)
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thats what I was thinking NZ!
Id be stupid not to take advantage
exactly which looms have to be changed over? obviously the fuel injection loom but what about the one that runs from the computer to every god damned thing under the bonnet?
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Old 12-11-2002, 00:11   #10 (permalink)
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The injector loom is the only thing that needs to be changed - it simply plugs straight in. MPI uses bank firing (2 lots of 3) so the wiring for the injectors is right since CFI uses bank firing as well.
The only wire than needs to be changes is on the CFI loom, one wire from the ISC plug needs to be cut and joined into the ecu loom on the ecu side. It runs the ICS. The car will run without it, but drivability is a bitch. The ECU relay also needs to be changed - the cfi one has a time delay after shutdown to allow the ICS to return to its start position. MPI doesnt have this.
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