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R33 Stock Ecus (auto And Manual Any Difference)

13thracer

By 13thracer,
in Engines & Forced Induction

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13thracer Rising Star

13thracer

Posted
Posted

can anyone tell me if there is any difference between the auto and a manual standard ecu for an rb2det i know that series one and two are different due to the igniter coil but the main reason im asking is that i have an auto series one ecu running in my s13 rb25 which runs a manual now, will this be causing any dramas that i havent come across yet. Do they come with different maps? or anything along those lines.

Stronzo Collaborator

Stronzo

Posted
Posted
can anyone tell me if there is any difference between the auto and a manual standard ecu for an rb2det i know that series one and two are different due to the igniter coil but the main reason im asking is that i have an auto series one ecu running in my s13 rb25 which runs a manual now, will this be causing any dramas that i havent come across yet. Do they come with different maps? or anything along those lines.

yes, they are different. What i know:

- auto has idle up while not getting N-switch signal.

- auto retards timing at high revs waiting for gear-change from auto-box.

I`m sure in first and almoust sure in second.

p.s. btw even Nissan says that R33 auto has 245 bhp and R33 manual has 250 in stock.

13thracer Rising Star

13thracer

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  • Author
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put in a manual ecu this afternoon runs heaps better no more dying in the arse totally at about 4500 5000 rpm only getting alittle rich and retard due to the higher boost level (time to tune the SAFC i think) for all those out there who buy a auto engine and loom for a conversion if you put a manual behind it go get a manual ecu in my case the conversion in my s13 was done by someone else and they used the auto ecu and put a manual behind. so in short you can use a auto ecu without an auto but it doesnt run properly.

GTR_STEALTH Proficient

GTR_STEALTH

Posted
Posted

Im surprised the person doing the conversion for you didnt realise this.

As far as i know, when changing ANY auto to manual (or viceversa) the ECU needs to be changed.....unless its a carburetted car, in which case there would be no ecu at all :D

GTR_STEALTH Proficient

GTR_STEALTH

Posted
Posted

If you were to put an Auto ecu into a Manual vehicle, yes it will run. But not properly.

However it may be different when it comes to Japanese cars, im not sure....so u may be correct. But as 13thracer has found, putting in the correct ecu has solved his problem. :D

13thracer Rising Star

13thracer

Posted
  • Author
Posted

i bought the car with the onversion allready done. and yes the car did run ok with the auto ecu but the manual one is an improvement 100% just general driving it was a lot smoother and more responsive. something for you to try arkon is next time you do a conversion use the auto ecu first then slap a manual one in see if you notice any difference between the two, well it worked for me so im happy i can tune the safc now .

4door_Sleeper Veteran

4door_Sleeper

Posted
Posted

Whilst I agree a manual ecu should be best, its also possible that in swapping the 2 over you have also done an ECU reset (usually done by disconnecting the battery and holding your foot on the break pedel)

Although I have never done this (I use a PFC) I have heard many others claim that the car is much more responsive after an ECU reset as it learns over time and reduces performance.

32vspecII Mentor

32vspecII

Posted
Posted

i did change from a auto r33 skyline auto ecu to a untuned power fc during my last converted car . it was virtually identical . the power fc has a slightly more agressive map than the stock ecu but it is hardly noticable

there were no issues with flat spots or idling issues or retard on the auto ecu . my understanding is that the auto gearbox tells the ecu when it changes gear so as the auto ecu with manual thinks your driving round in neutral there should never be a gear change for retarding.

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