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Old 14th October 2006, 21:14   #1
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Default Tuning A Lancer

Hey guys,
Alrite, so got all the mods i want on the car. It does feel and perform decently but there is some 'missing' when u shove the accelerator suddenly at times. After that it takes off nicely tho'. Also at idle when AC is on, the rpm keeps dropping from 900 to 700 and goes back up. This happens continously for sometime and then it behaves normally.

Now the mods i have are.
1. K&N Conical filter
2. NGK Iridium plugs
3. Freeflow (stock headers)
4. Splitfire cables

So is it necessary to reset, tune or adjust(?) the ECU settings or anything accordingly??

And here are the top speeds in each gear
1st - ?
2nd - 110kmph
3rd - 155kmph

Last edited by karthik247 : 14th October 2006 at 21:17.
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Old 14th October 2006, 21:26   #2
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karthik, that lags ther in Zak's car too.
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Old 14th October 2006, 21:33   #3
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The rpm changing from 700rpm to 900rpm i think is normal. You will notice when the engine is cold it actually goes to 1100rpm and back to around 800rpm later.

When the AC is switched on the rpm goes up as soon as the compressor kicks in to compensate for the load. The ECU takes care of that. Hence you will see the rpm vary.

I'm not sure if this is due to the mods carried out on your car. It's just that I've noticed the same phenomenon in my lancer and other mpfi cars the rpm variation.
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Old 14th October 2006, 21:36   #4
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No, its not the compressor on/off thing. This is also not when the car is started for the first time. It usually happens. The idle is at 900rpm. It goes down to ~700rpm and back up almost immediately. Not that it stays at 700rpm, it goes up instantly. This keeps happening for sometime.

I guess i'll post a video tomorrow.
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Old 14th October 2006, 21:43   #5
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Was this happening even before you got all the mods done or only after that?

700-900rpm isnt really a big change looks like its just hovering around the 800rpm mark.
I'm guessing it's normal but i could be wrong.
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Old 14th October 2006, 23:44   #6
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while I am not the most sound guy technically, I will try to explain my theory on this.

MPFI cars usually adjust the RPM's automatically when started. They like carburetted cars dont need to be kept on idle every time it is started.

Hence the RPM's fluctuate a bit when started.

As far as the lag in pickup is concerned, it maybe due to the mods carried on the car. THe designs on the mods have a bearing on when the engine produces power.
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Old 15th October 2006, 11:08   #7
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Get your Injectors,fuel filter cleaned, if possible check fuel pressure after that see if there is any improvement in idling if not get the IAC valve checked, you should also try switching back to stock plug wires for diagnosis purpose i have seen problem with splitfire plug wires causing weird behaviour. once switched back to stock problem diminished the connectors might not be crimped properly is likely the reason for that.
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Old 15th October 2006, 11:45   #8
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The 20k kms service had been done about 2months ago. So fuel filter and all are new. The prob was there even before i started using Splitfire cables.
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Old 15th October 2006, 14:18   #9
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Quote:
Originally Posted by vid6639
The rpm changing from 700rpm to 900rpm i think is normal.
thats normal, but what Karthik said was 900rpm to 700rpm which is abnormal
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Old 15th October 2006, 17:12   #10
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Quote:
Originally Posted by karthik247
The 20k kms service had been done about 2months ago. So fuel filter and all are new. The prob was there even before i started using Splitfire cables.
Did This problem cropped before or after 20K km service?
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Old 15th October 2006, 18:16   #11
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Yes it used to happen before as well, but now its happens most of the time. Almost always. Happened about 3-4times today also. :(
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Old 15th October 2006, 19:24   #12
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Karthik,

Did you try resetting the ECU? Also, where from do you fill fuel - check the fuel tank for deposits? Try running stock plugs and wires just to test? Just some straight forward suggestion - hope it helps.

Thanks,
-P.
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Old 15th October 2006, 20:12   #13
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Check the 'idling actuator'.
It might have conked.
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Old 15th October 2006, 20:43   #14
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hey karthik ,
I feel you have to get it checked for the timming and the theory is that when a/c is on the load increases and the engine tries to adjust it without your manual input(pressing the accelerator).so if the rpm decreases when it should have been increasing means the fuel supplied is not enough to take the load of a/c.check the machine with a guy who is having a good idea about the subject.one more thing -it can be either the fuel supplied is not enough or the air supplied is not enough.so check it out.
ram
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Old 15th October 2006, 21:10   #15
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Fuel used is either Speed or Xtra Premium. And guys does the ECU reset work by disconnecting the battery?? Cuz just spoke to Ram and he said it doesn't work that way. Also the ECU settings can only be checked and not changed according the the authorised service guys.

Timing was checked y'day itself and it was found to be fine. I'll shift to stock plugs and wires, lets see what happens.
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