R33 Stock Ecus (auto And Manual Any Difference)

[13thracer]

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]

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]

thanks mate might explain the big hole i fall in at about 4500 might try get my hands on a stock manual ecu

[benl1981]

More likely the ECU pulling back timing and adding fuel. I doubt the manual excu will help. Get a PFC or SAFC.

[13thracer]

i have an safc just havent got it tuned yet i would like to get everything right before i put it on the dyno

[13thracer]

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]

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

[32vspecII]

ive used the auto ecu for conversions in both silvia and skylines and it functions just the same as the manual ecu

[GTR_STEALTH]

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.

[13thracer]

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]

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.

[13thracer]

yeah im all to familar with the reset procedure did it basically every time i went out driving with the auto ecu, the manual one has made a huge diference for my rb

[32vspecII]

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.