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  1. #11
    Rods 'n' Sods Junkie tony lewis's Avatar
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    fantastic really great if mr roadrunner is watching perhaps he could put your info into tech features? may need to read through it a few times to understand everythin and to get it to stick in the ol grey matter but very well explained martin cheers is it worth it ?the change from carbs to computers? even the v8's in the big boys toys are going this way now i suppose its what were used to a modern mechanic apprentice might be overawed by the wierdness of a carburettor but i doubt it thanks again
    Last edited by tony lewis; 11-03-2010 at 19:13.

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  3. #12
    Rods 'n' Sods Junkie tony lewis's Avatar
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    can an ecu be pre set like a carb so it could do away with a few sensors?

    and why if we transplant an engine complete complete withall its sensors wiring etc from donor vehicle will it not run properly surley if it still thinks its in the donor vehicle no harm no foul?they run off a 12 v battery same as my old banger am i missing a point here
    Last edited by tony lewis; 11-03-2010 at 19:26.

  4. #13
    My name is Martin 30psi's Avatar
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    Well you can have a big fancy ECU with many feature etc that will do more than you can imagine but it's only as good as the person mapping it.

    If an engine is well mapped it's more than likely going to be better optimised than a carb and mechanical/vacuum advance both in terms of performance and economy.

    Quote Originally Posted by tony lewis View Post
    can an ecu be pre set like a carb so it could do away with a few sensors?

    If you think about what a carb does its effected by both engine load, air speed and rpm. The least sensors you have the more compromised the system will be. You can get base maps for most engines, providing you know the fuel pressure, injector size and engine cc. It will get the engine running.
    Last edited by 30psi; 11-03-2010 at 23:21.

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  6. #14
    Rod'a'holic rodbuilder's Avatar
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    Good article Martin.

    On a practical level, I have a few EFI rods, all the engine set ups I have come accross have a complete self contained wiring loom ending in one connector which you need to wire up.

    Normal connections are

    Live feed to ECU
    signal wire to relays normally 2
    Earth, usually 2.
    Feed to petrol pump via relay
    Live feed when cranking the engine
    Wire to Air con not needed if you do not have it fitted
    Speed sensor will run without

    Quite straight forward even for an electrical numpty like me.

    I would choose an EFI system over carbs any day, fuel ecconomy and no fiddling about with adjustments.

  7. #15
    Col
    Heavy Oiler Col's Avatar
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    30PSI
    How long did it take you to compile that posting??

  8. #16
    My name is Martin 30psi's Avatar
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    Quote Originally Posted by Col View Post
    30PSI
    How long did it take you to compile that posting??
    Err 20 mins all in I reckon, why's that?

  9. #17
    Col
    Heavy Oiler Col's Avatar
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    Seemed a lot of work (unless you already had pics etc)
    In any case, Well done on such a full, well explained posting

  10. #18
    My name is Martin 30psi's Avatar
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    Cheers yeah, longest bit was trying to find the pics off google

  11. #19
    Official RnS Addict v8ian's Avatar
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    i have been runing aftermarket FI for the last 10 years, all the sesors are basic, Throttle poston sensor, Air temp, Water temp, and thottle positon sensor, certainly not rocket science, obviously a modicum of common sense when it comes to wiring, but again its not too hard. BUT a lot of problems can be found in poor wireing, I now use a supersoft wire and crimp all joints to help prevent solder spikes and brittle sheer points inside the wires, another thing I have started to do is label all wires as the supersoft wire is black only, realy helps in fault finding or component changing

    As for mapping, It pays to get it done professionaly, even with my best efforts after a session on a set of rollers I got an extra 40hp and 45 ftlbs of torque, I have seen a few people really struggle at this stage using a DIY Ecu, which in my opinion is a bit of a false economy, not only with reliability, but back-up as well,
    Just to show it can be done at home, buying at the right price, Ebay or word of mouth, dosent need to cost a fortune if you buy hardware 2nd hand


  12. #20
    Carburation 'sucks' Roscobbc's Avatar
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    Wozatt! - Rover with individual runner injection?

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