Tony,
Sorry, just introduced myself: Here
I'm a bit confused now on the comments that "GUte" said about un-plugging the ECU and the motor could still run. If the ECU controls the start of injection timing, without you would never get a "start" of the injection cycle i.e. no fuel.
Thanks for the intro.Originally Posted by Flex
While the engine may (I didn't think they would but if he's tried it?) start with the ECU disconnected the injection timing would be a default base setting.
I need to do a bit more research because I thought TD42Ti also had fly-by-wire throttle control.
Tony
Last edited by YNOT; 5th September 2011 at 05:15 PM.
Tony, I check the wiring diagram I couldn't see any evidence of drive-by-wire. So the only way to increase the power on the TD42Ti is to modify the pump?
You will get some increase from a chip as it alters the timing like ignition timing on a petrol.
Modifying the pump may not be necessary depending on how much more power you want. If you keep the standard turbo but up the boost to 14Psi you can usually get enough fuel from the standard injector pump. Start fitting bigger turbo's and intercoolers and you will probably need to have a bigger plunger fitted to the injector pump to be able to supply enough fuel.
Tony
Would you still need to tune the pump if you change the injection timing? Because there is no electronic control of the governor?
To change the injection timing would require tuning and computer adjustment. To adjust fuel flow (which you do to compensate for more boost) is a manual adjustment but one that is better done on a dyno by someone who knows what they are doing.
Tony
(hope I dont sound rude, not my intention)
What computer adjustment are you talking about YNOT? The only thing the computer does is a 'trim' of the timing control valve according to inputs from the throttle (tps) and needle lift sensor in number 1. A chip is not an option for the TD42Ti as the computer only controls ancillaries and not injection timings or quantities. Timing has to be adjusted manually, by physically rotating the injector pump and using dial indicator and adapters (cheap off evilbay) also the boost compensator diaphragm gets rotated to give the fastest off boost response to get the fuel into the engine to spool the turbo up. As YNOT has said though better done on a dyno and shouldnt be attemted without boost and pyro gauges.
Regards
Dave
I'm not overly familiar with the TD42Ti control system. My understanding and correct me if I'm wrong, is the computer trims the injection timing much the same as a petrol EFI computer can trim the ignition timing. Base timing is still set by rotating the pump housing.
Any information you can add about the TD42Ti control system is apprecieated.
Tony
Yeah YNOT that is pretty much on the money. It is a very basic form of emissions control. everything else works the same as a TD42T fuel system, it just has a trim, it adjusts stuff all really and can be uplugged (as well as tps and needle lift sensor and will still run fine. With the TD42Ti, the timing cant be adjusted much over .68 (I think) as it has a bit of a hissy fit. To get the best out of it though leave it all hooked up.
YNOT (20th November 2011)
Do you have a list of pump timing settings for TD42 and TD42T, factory or what you have found works best?
I have a Nissan Y61 training manual that gives the spec for a TD42 (naturally aspirated) at 0.62.
While we're on the subject, do you have a timing setting for TD27T?
Tony
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