Auto ECU with Manual Trans? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Mista Lee · 08-23-2009, 08:39 PM

Are there any advantages/disadvantages if you're using an A/T ecu in a M/T?

ILoveMyRHS13 · 08-23-2009, 08:42 PM

No Speed and rev limiter, fuel cut-off and governor.

Run the auto one; it runs just fine.

besTint · 08-24-2009, 03:29 PM

yea, auto has better map. only downside is you get CEL and idle drops to stall every now and then if you dont give it a little gas at start up.

cooltomato · 08-24-2009, 03:36 PM

i run the AT ecu pretty much what the last 2 guys said, you be fine

blackrms13 · 08-24-2009, 03:38 PM

Quote:

Originally Posted by besTint

yea, auto has better map. only downside is you get CEL and idle drops to stall every now and then if you dont give it a little gas at start up.

im assuming ur talkin about s14s?

cuz i dont get CEL or idle drops to stall... maybe when im using AC, brake pedal, headlights, defroster are all on at the same time, but i dont think thats the same problem...

the fuel mapping or whatever the fine ECU tuning is little different between the s13 manual and auto ECUs

drift freaq · 08-24-2009, 03:44 PM

Quote:

Originally Posted by besTint

yea, auto has better map. only downside is you get CEL and idle drops to stall every now and then if you dont give it a little gas at start up.

You only get CEL on a S14 OBDII . You will not get it on a OBDI car. The idle does drop but not to stall that is a gross over exaggeration of the drop. It usually bumps to about 300 rpm over stock idle and then drops back. If its dropping to a stall point you have other problems as well.

Using a Automatic ECU on a 5 speed swapped S13 or on any S13 is a little stealth upgrade. Like what was said above it raises the rev limit, eliminates the speed cut and has a slightly different timing curve and fuel map. This is due to having to push a Torque converter. Hence why it turns into a performance upgrade for 5 speed cars.

I always leave the auto ecu in on 5 speed swaps on S13 because of this.

Mista Lee · 08-24-2009, 05:36 PM

Great info to know

thanks

nurvcom · 08-24-2009, 08:37 PM

what about rb20det auto ecu? on RB20det m/t

would that work?

I LUV MY S13 · 08-24-2009, 09:04 PM

damn no wonder my idle has been actin up..i switched to the auto ecu bout a month ago...cel light isnt on either

blackrms13 · 08-24-2009, 11:24 PM

Quote:

Originally Posted by drift freaq

You only get CEL on a S14 OBDII . You will not get it on a OBDI car. The idle does drop but not to stall that is a gross over exaggeration of the drop. It usually bumps to about 300 rpm over stock idle and then drops back. If its dropping to a stall point you have other problems as well.

Using a Automatic ECU on a 5 speed swapped S13 or on any S13 is a little stealth upgrade. Like what was said above it raises the rev limit, eliminates the speed cut and has a slightly different timing curve and fuel map. This is due to having to push a Torque converter. Hence why it turns into a performance upgrade for 5 speed cars.

I always leave the auto ecu in on 5 speed swaps on S13 because of this.

how much does the rev limit get raised by?
just curious...

never heard of this before...

I LUV MY S13 · 08-24-2009, 11:26 PM

Quote:

Originally Posted by blackrms13

how much does the rev limit get raised by?
just curious...

never heard of this before...

ive taken mine up to 75....stupid i kno

xpertsnowcarver · 08-24-2009, 11:27 PM

RMS13: WHA!? This is very well know for tranny swaps bro!

And its only a 300rpm difference

blackrms13 · 08-24-2009, 11:47 PM

never heard of it
only the speed limiter n fuel map difference...

but now i do...

Dazzla · 09-03-2009, 09:50 AM

does this also increase the rev limiter in s14's or does it completely remove it?

conroyr · 09-03-2009, 08:50 PM

ok so i have an 1991 240sx coupe 5speed and i bought an auto ecu do u need to change anything to get ride of the governer or just switch out the manual ecu for the auto one. thanks

zenki.life · 09-04-2009, 01:50 AM

fuckin aye! thats why my idle is so low now. good shit to know

xpertsnowcarver · 09-04-2009, 02:02 AM

lol.. man. This info is so ooolllddd.

*Wake* · 09-04-2009, 02:19 AM

Seriously! you guys are just now talking about this?
Most of us have known about this for days, now everyone is going to jack up their fucking prices on auto ecus, when they were practically giving em away.
fuck and right when I do my DOHC swap too.

94_240sx · 09-04-2009, 09:09 AM

I switched auto ECU and manual ECU back and forth several times after I did the manual swap on my s13. I wanted to see which one fits better. Surprisingly, it was auto ECU. It's hard to tell, but something was not right with manual ECU. Most of all, I couldn't pass emission with manual ECU. I switched back to auto ECU and passed. Does this make sense? Anyway, I still have manual ECU just in case.

Dazzla · 09-04-2009, 10:57 AM

I always heard that keeping the auto ECU when you swapped your 5-speed meant you'd get a CEL...unless your pulling out the bulb isn't that an automatic fail for any emissions type testing?

I'm scared of the thought of no rev-limiter. One bad downshift and is my engine done? lol

!Zar! · 09-04-2009, 11:49 AM

No speed cut.

It still has a rev-limiter.

I ran an auto ecu on my kat setup and was bouncing off that bitch for days.

Bigsyke · 09-04-2009, 01:52 PM

Quote:

Originally Posted by drift freaq

You only get CEL on a S14 OBDII .

You will get a CEL on an OBD1 S14 too.

*swayray* · 09-04-2009, 01:59 PM

the only thing i did notice happening when i installed a KA24DE Auto ECU on my 92 coupe M/T was the high idle. Even after playing w/ the IACV, it still idled high. That and poor MPG and of course, the check engine light stayed on the whole time. Rev-limit is still the same... fuel cuts at close to 115 mph... so it didn't work for me. But if anyone wants to try it, you can have my auto ecu for $20. I feel that this myth is busted.

Bigsyke · 09-04-2009, 02:32 PM

Is the # 3D on your ECU?

*swayray* · 09-04-2009, 08:05 PM

Quote:

Originally Posted by Bigsyke

Is the # 3D on your ECU?

I LUV MY S13 · 09-04-2009, 08:09 PM

Quote:

Originally Posted by Dazzla

I always heard that keeping the auto ECU when you swapped your 5-speed meant you'd get a CEL...unless your pulling out the bulb isn't that an automatic fail for any emissions type testing?

I'm scared of the thought of no rev-limiter. One bad downshift and is my engine done? lol

my cel is off...all i did was swap the ecu..

Seikenman · 09-05-2009, 09:40 PM

Quote:

Originally Posted by Dazzla

I'm scared of the thought of no rev-limiter. One bad downshift and is my engine done? lol

Uhh you would blow it up either way... This isn't Gran Turismo haha

blackrms13 · 09-06-2009, 06:11 PM

Quote:

Originally Posted by swayray

u should try ones thats 29 or 28

Nex · 06-23-2012, 04:27 AM

Is this true ... Auto ecu is a stealth upgrade?

Megaman V2 · 06-23-2012, 05:56 AM

Holy thread revival, please read ^^

08-23-2009, 08:39 PM	#1
Mista Lee Zilvia FREAK! Join Date: May 2008 Location: Riverside, CA Age: 32 Posts: 1,003 Trader Rating: (26) Feedback Score: 26 reviews	Auto ECU with Manual Trans? Are there any advantages/disadvantages if you're using an A/T ecu in a M/T? __________________

08-24-2009, 03:29 PM	#3
besTint Post Whore! Join Date: Mar 2008 Location: Stanton, CA Posts: 2,641 Trader Rating: (81) Rides Gallery: besTint Feedback Score: 81 reviews	yea, auto has better map. only downside is you get CEL and idle drops to stall every now and then if you dont give it a little gas at start up. __________________ http://squarespokes.com/

08-24-2009, 05:36 PM	#7
Mista Lee Zilvia FREAK! Join Date: May 2008 Location: Riverside, CA Age: 32 Posts: 1,003 Trader Rating: (26) Feedback Score: 26 reviews	Great info to know thanks __________________

08-24-2009, 09:04 PM	#9
I LUV MY S13 Post Whore! Join Date: Dec 2008 Location: Norwalk, Los Angeles Age: 34 Posts: 3,349 Trader Rating: (35) Rides Gallery: I LUV MY S13 Feedback Score: 35 reviews	damn no wonder my idle has been actin up..i switched to the auto ecu bout a month ago...cel light isnt on either __________________ -Jorge

08-24-2009, 11:27 PM	#12
xpertsnowcarver Post Whore! Join Date: Jan 2007 Location: LA, CA Posts: 2,667 Trader Rating: (44) Feedback Score: 44 reviews	RMS13: WHA!? This is very well know for tranny swaps bro! And its only a 300rpm difference __________________ My YouTube Channel

08-24-2009, 03:36 PM	#4
cooltomato Leaky Injector Join Date: Aug 2009 Location: CA Age: 37 Posts: 76 Trader Rating: (1) Feedback Score: 1 reviews	i run the AT ecu pretty much what the last 2 guys said, you be fine

08-24-2009, 08:37 PM	#8
nurvcom Zilvia Junkie Join Date: Aug 2008 Location: Sevierville TN Posts: 589 Trader Rating: (4) Feedback Score: 4 reviews	what about rb20det auto ecu? on RB20det m/t would that work?

08-24-2009, 11:47 PM	#13
blackrms13 Post Whore! Join Date: Jul 2007 Location: 626 Posts: 2,591 Trader Rating: (21) Feedback Score: 21 reviews	never heard of it only the speed limiter n fuel map difference... but now i do... __________________ 91' 240sx Fastback LE

09-03-2009, 09:50 AM	#14
Dazzla Zilvia Member Join Date: Feb 2008 Location: USA Posts: 216 Trader Rating: (0) Feedback Score: 0 reviews	does this also increase the rev limiter in s14's or does it completely remove it?

09-03-2009, 08:50 PM	#15
conroyr Join Date: May 2009 Location: chicago ridge Age: 34 Posts: 12 Trader Rating: (0) Feedback Score: 0 reviews	ok so i have an 1991 240sx coupe 5speed and i bought an auto ecu do u need to change anything to get ride of the governer or just switch out the manual ecu for the auto one. thanks

09-04-2009, 02:02 AM	#17
xpertsnowcarver Post Whore! Join Date: Jan 2007 Location: LA, CA Posts: 2,667 Trader Rating: (44) Feedback Score: 44 reviews	lol.. man. This info is so ooolllddd. __________________ My YouTube Channel

09-04-2009, 02:19 AM	#18
Wake Premium Member Join Date: Dec 2003 Location: Santa Cruz, ca Age: 41 Posts: 6,699 Trader Rating: (8) Feedback Score: 8 reviews	Seriously! you guys are just now talking about this? Most of us have known about this for days, now everyone is going to jack up their fucking prices on auto ecus, when they were practically giving em away. fuck and right when I do my DOHC swap too. __________________ S.P.P.S. Member #00 CoUpe LOve Member #00

09-04-2009, 09:09 AM	#19
94_240sx Zilvia Addict Join Date: Aug 2006 Location: TX Posts: 686 Trader Rating: (7) Feedback Score: 7 reviews	I switched auto ECU and manual ECU back and forth several times after I did the manual swap on my s13. I wanted to see which one fits better. Surprisingly, it was auto ECU. It's hard to tell, but something was not right with manual ECU. Most of all, I couldn't pass emission with manual ECU. I switched back to auto ECU and passed. Does this make sense? Anyway, I still have manual ECU just in case.

09-04-2009, 10:57 AM	#20
Dazzla Zilvia Member Join Date: Feb 2008 Location: USA Posts: 216 Trader Rating: (0) Feedback Score: 0 reviews	I always heard that keeping the auto ECU when you swapped your 5-speed meant you'd get a CEL...unless your pulling out the bulb isn't that an automatic fail for any emissions type testing? I'm scared of the thought of no rev-limiter. One bad downshift and is my engine done? lol

09-04-2009, 11:49 AM	#21
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	No speed cut. It still has a rev-limiter. I ran an auto ecu on my kat setup and was bouncing off that bitch for days. __________________

09-04-2009, 01:59 PM	#23
swayray Premium Member Join Date: Aug 2005 Location: torrance Posts: 1,017 Trader Rating: (23) Rides Gallery: swayray Feedback Score: 23 reviews	the only thing i did notice happening when i installed a KA24DE Auto ECU on my 92 coupe M/T was the high idle. Even after playing w/ the IACV, it still idled high. That and poor MPG and of course, the check engine light stayed on the whole time. Rev-limit is still the same... fuel cuts at close to 115 mph... so it didn't work for me. But if anyone wants to try it, you can have my auto ecu for $20. I feel that this myth is busted. __________________ http://www.thenismoshop.com

09-04-2009, 02:32 PM	#24
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 39 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	Is the # 3D on your ECU?

06-23-2012, 04:27 AM	#29
Nex Join Date: May 2012 Location: Atlanta Ga Age: 42 Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Is this true ... Auto ecu is a stealth upgrade? __________________ 90 Black S13 Pignose fastback manual

06-23-2012, 05:56 AM	#30
Megaman V2 Leaky Injector Join Date: Sep 2011 Location: Florida Age: 32 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Holy thread revival, please read ^^