Author Topic: rev counter? Idle Air Controller (IAC)?  (Read 7893 times)

Offline damo_S13

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rev counter? Idle Air Controller (IAC)?
« on: February 10, 2007, 03:37:23 pm »
will as im getting closer to having then engine in. i got a cupple of problems/ questions

1. how do i get my rev counter working?  ???

2. do i really need a Idle Air Controller (IAC)? can i run with out one ok? i have no were to fit one at min due to using a custom inlet manifold

thanks
damo
« Last Edit: February 10, 2007, 07:39:35 pm by damo_S13 »
building vems 4age with itb powered corolla

Offline cliffb75

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Re: rev counter? Idle Air Controller (IAC)?
« Reply #1 on: February 10, 2007, 08:06:44 pm »
If you're not to worried about idle quality then you don't need an idle air bypass valve. Just set up the ignition map at around 10BTDC at your chosen idle speed and then kick it up below that to help avoid stalling. Not great but a certain UK car maker had their cars setup like this for years...

Offline damo_S13

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Re: rev counter? Idle Air Controller (IAC)?
« Reply #2 on: February 10, 2007, 08:50:58 pm »
cool that will do me :)

thanks
damo
building vems 4age with itb powered corolla

Offline rob@vems.co.uk

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Re: rev counter? Idle Air Controller (IAC)?
« Reply #3 on: February 11, 2007, 08:47:39 am »
Thanks for that Cliff, its a handy idea that will overcome the stumble that some get when we use the spark retard/cut features for idle control.

Onto RPM... Its a case of finding out what the stock Nissan ECU uses, with most of the cars I've done we've been able to use a feed through a small diode network to give the tacho the trigger it wants.  I see that the Nissan RPM count comes from the ECU so I'm thinking that we're probably going to only want to give the gauge +5v pulses.  I've put it on my to-do list and I'll get looking later today.

Offline dnb

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Re: rev counter? Idle Air Controller (IAC)?
« Reply #4 on: February 11, 2007, 02:12:34 pm »
I've been using the "valley" method of setting idle ignition advance for the past year.  It works very well when combined with the advance trimming method of idle control.  I can turn off the stepper air valve and not lose much idle quality at all.

I expect the rev counter just needs a pullup resistor to +12v or +5v since it was ECU controlled anyway.   Some kind of protection diodes would probably be a good idea, although I don't think a rev counter can kick much...

Offline damo_S13

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Re: rev counter? Idle Air Controller (IAC)?
« Reply #5 on: February 23, 2007, 11:49:59 pm »
ok cool thanks bud

i really need to be spoon fed a little with this info tho  ::)

anyone got a good i idea on what i need to do for the tacho or a little wiring diagram would be great lol

i know which wire goes to the tacho now i just need to know where to wire it to with what elss in between

thanks for all the help

damo
building vems 4age with itb powered corolla