Auto vs. 5spd ECU -- Differences??
07-03-2005, 05:45 PM
#1
Auto vs. 5spd ECU -- Differences??
How are these ECUs' programs different?
I have a 5spd swap but I'm running the auto ECU, so I'm wondering if it'd help me at all to go to a 5spd ECU.
My car also does this weird thing where if I rev it, even just the tiniest little bit, and then let off, the revs will stick at 1500 rpm before dropping back to idle. Can can tell me what that's all about too?
I have a 5spd swap but I'm running the auto ECU, so I'm wondering if it'd help me at all to go to a 5spd ECU.
My car also does this weird thing where if I rev it, even just the tiniest little bit, and then let off, the revs will stick at 1500 rpm before dropping back to idle. Can can tell me what that's all about too?
08-01-2005, 04:28 PM
#5
Senior Member
Join Date: Jan 2005
Posts: 1,108
Originally Posted by jordandalley
There's heaps of difference. It's not a good idea to mix and match...
Hey d00df00d do you throw a CEL because your Auto ecu is looking for output from the Auto trans sensors?
08-01-2005, 04:37 PM
#6
Originally Posted by d00df00d
...My car also does this weird thing where if I rev it, even just the tiniest little bit, and then let off, the revs will stick at 1500 rpm before dropping back to idle. Can can tell me what that's all about too?
08-01-2005, 04:39 PM
#7
Originally Posted by jordandalley
There's heaps of difference. It's not a good idea to mix and match...
Technically there is NO performance benifit to switching to the manual. The only reason to do it would be if it was a 96 that JWT could mod.
08-01-2005, 04:55 PM
#8
JWT can mod both auto and 5spd ecus.
Performance-wise there is no difference whatsoever... I have back to back dynos done minutes apart to prove this. Numbers were within 1hp on each run.
The only differences I notice with 5spd vs auto ECUs is that with the clutch depressed, the RPM will stay a little higher (not quite 1500 for me, more like 1000-1200 until I come to a complete stop, then drop down to normal idle). I have had a ton of ECU combinations... 98 auto ecu in 96 5spd, 96 5spd ecu in 96 5spd, 95 auto ecu in auto that has been converted to 5spd, etc etc etc and these are the only differences. MikeD has been using my 98 auto ECU in his 96 I30 5spd for months now and experiences the same thing, just the rpm matching thing.
Performance-wise there is no difference whatsoever... I have back to back dynos done minutes apart to prove this. Numbers were within 1hp on each run.
The only differences I notice with 5spd vs auto ECUs is that with the clutch depressed, the RPM will stay a little higher (not quite 1500 for me, more like 1000-1200 until I come to a complete stop, then drop down to normal idle). I have had a ton of ECU combinations... 98 auto ecu in 96 5spd, 96 5spd ecu in 96 5spd, 95 auto ecu in auto that has been converted to 5spd, etc etc etc and these are the only differences. MikeD has been using my 98 auto ECU in his 96 I30 5spd for months now and experiences the same thing, just the rpm matching thing.
08-01-2005, 05:02 PM
#9
I know they can mod both, but if you are a 97+ convert and are going to be putting in a 96 JWT ecu it might as well be a manual ecu... you would get rid of that stupid flashing OD light at start up and consolidate multiple CELs into 1 rear O2 CEL which could be resolved at a later date.
08-01-2005, 06:07 PM
#10
Originally Posted by i30ds
I know they can mod both, but if you are a 97+ convert and are going to be putting in a 96 JWT ecu it might as well be a manual ecu... you would get rid of that stupid flashing OD light at start up and consolidate multiple CELs into 1 rear O2 CEL which could be resolved at a later date.
anybody know why?
08-01-2005, 06:35 PM
#11
Senior Member
Join Date: Jan 2005
Posts: 1,108
Originally Posted by aznsap
i recently converted to 5speed (i have a 95) and i have that flashing OD light at startup. i switched to a 95 5speed ecu however, so i don't know why it's flashing.
anybody know why?
anybody know why?
but SUCKS that the CEL will go on with the Auto ECU.
08-01-2005, 10:46 PM
#13
Originally Posted by aznsap
oh, maybe.... i didn't know there was a trans computer? where is it located and how do i remove it? thanks!
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