Nissan ECU Tuning

raymac · Joined: 30 Mar 2004 Posts: 1 Location: UK

Hi,
My auto box decided to go up in a puff of smoke, so I converted it to a manual. It works OK but I'm still using the auto ECU. I was wondering if there are any changes that I should make to the rom in order to make it run better with the manual box.
I've noticed that the idling can sometime be a little erratic, also it can stall on occasion.

What are the differences between manual/auto roms other than the differening fuel/timing maps for the different tubs/cams.

Any help would be appreciated.

Cheers
Shaun

RomChip200 · Joined: 27 Nov 2003 Posts: 196 Location: France

I can only say one thing as an example :
For a S13 (CA18DET), manual and auto bins are different.
Ignition map is slightly different in the low rpm range and fuel map has some more deeply changes in the low rpm range also (below 3500)
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200SX CA18DET S13 '92.
300ZX TT '91.

Ryan · Joined: 24 Nov 2003 Posts: 86

Hi there are some diffs/

when you are still and shift from N to D the Idle air increses and the so does the timming. to stop stall.

From mem I read an artical on doing auto to man convert, and they said O.K to use auto ecu for man but not the other way around, makes sence I guess

Cheers
Ryan

yellowzxtt · Joined: 21 Nov 2003 Posts: 26

Hi,

I use the auto rom in manual ALL the time with no problems. I think having 1 rom for both types makes development easier. I believe the fuel and timing maps are virtually identical so it should not matter

Harry

speedlab · Posted: Tue Apr 06, 2004 11:23 am Post subject: Manual in an auto

Can you run a manual rom in an auto??
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TTwhin · Joined: 10 Dec 2003 Posts: 132 Location: Norway

speedlab · Posted: Wed Apr 07, 2004 12:25 am Post subject:

can you port manual maps into an automatic chip?
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speedlab · Posted: Wed Apr 07, 2004 12:27 am Post subject:

can you port manual maps into an automatic chip?
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Ryan · Joined: 24 Nov 2003 Posts: 86

Hi,
the Maps from the same regin ie cali or jap eur etc are identical for manual/auto. cali maps are different from jap maps, but the auto/manuals chip map for that regin are the same.

The differnece is engine computer listening to the autobox computer, manual ecu chips do not, and auto ecu chips do

You can run a manual chip in an auto, but not advisied, the shift points etc are in the AUTO BOX computer not the engine computer, so it does run, but the auto computer tells the engine computer that it is about to change gear, and the enginge computer reduces power to auto box by reducing the timming so the auto box can change gear with out a big strain, but manual chip don't listen and keeps the power up.

also when moving from n to d the timming advances to help stop stall, the manual does do this, but it is responsive action, because its not listining to the auto box, but it see's revs drop and about to stall so it increases timming and adds idle air.

but with auto engine chip, it listens to auto, and soon as you change from n to d the enigne computer changes striaght away because it listened to the auto computer and knows that you have changed from n to d, so its programmed action, wich all makes for smoother shifts and longer lasting auto box when using the correct engine chip.

and if you use an auto chip in a manual, the ecu listens to autobox computer, wich is not there so does not say anything, causeing the chip to run normally (no power reduction etc same as a manual).

and of course you can port manual maps into an auto chip, aslong as the engine has the same mods I/C's turbos etc, so it not too high timming or too lean fuel etc.

Hope that helps
Ryan

PhatBob · Posted: Mon Feb 28, 2005 2:07 pm Post subject:

I've just completed an auto to manual conversion on my '95 S14, and am now wondering about chipping it.

I wonder how much effect the transmission ECU will have as it currently believes that the transmission is set in Park, so will it be telling the main ECU to retard ignition before a change? Is there a line that I can check to see if a signal is being sent from the transmission ECU?

Rob

redss · Joined: 03 Dec 2005 Posts: 5

So far I see that it doesn't matter if the ECU is manual or auto for used in manual car. I hope the information is correct. I am about to use an auto ECU in a daughterboard mod for a manual car.

Mort · Joined: 02 Apr 2005 Posts: 82

PhatBob it looks like the conversion was not done correctly then. The park/netural switch should have been wired into the ecu, otherwise problems like this arise. We at WMS always swap ecu's to a manual when doing the conversion.

datsunboy · Joined: 26 Jul 2005 Posts: 209 Location: New Zealand

I am using a auto ECU and loom on my manual....with a chip with a manual ROM.
it works FINE....no problems at all.
I didnt need to even connect the "park switch" wire for the ECU up to anything, as I was putting the engine into a Datsun that was already manual
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