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Dyno Day Sunday 17th January-turbotune

-RBD2-

By -RBD2-,
in South Australia

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RubyRS4 Grand Master

RubyRS4

Posted
Posted
nice power curve ruby....

Wanna get it much better. Going to take it to either Shaun or Martin and get them to interpret whats going on in that upper part of the power curve. Smooth things out a bit.

The car has been awesome to drive since I did the manual conversion. The improvement in power shows. Now I need to get it onto the track for some fun ... not on the streets kids :P

Krishy Grand Master

Krishy

Posted
Posted
heres my chart... sorry bout quality, phone pic.

messed up curve huh?

th_DSC01157.jpg

damn dude that looks like a drawing done by a little kid on crack.....why such a bad curve do you know???

the curve climbs up very sharply....whats the reason for that???

SkyHi_33 Mentor

SkyHi_33

Posted
Posted
damn dude that looks like a drawing done by a little kid on crack.....why such a bad curve do you know???

the curve climbs up very sharply....whats the reason for that???

standard rb25 computer having a fit because the the boost is set higher than factory... its been doing it ever since i got my boost controller. one day its fine the next it has a fit.

im gonna go book it in for a tune up soon and hopefully with some timing it will smooth out...

Krishy Grand Master

Krishy

Posted
Posted

i dont remember my car doing any of that and i had the standard ECU in there as well and boosted it up to 13.5psi.....

something else could be the cause of that as well maybe??

SkyHi_33 Mentor

SkyHi_33

Posted
Posted
i dont remember my car doing any of that and i had the standard ECU in there as well and boosted it up to 13.5psi.....

something else could be the cause of that as well maybe??

I do still have my auto ecu in there, which might be the problem, but it was doing it when the car was still automatic too.

Im not that fussed really, just waiting for some $$ to buy some goodies and put my 30 bottom end in to it.

Krishy Grand Master

Krishy

Posted
Posted

fair enough.....get a manual ecu and chuck it in there and see if that makes a difference mate.....that thing looks like it will take some getting used to for normal day to day driving lol....

4door_Sleeper Veteran

4door_Sleeper

Posted
Posted

SkyHi_33, the problem is your ECU.

The curves are exaggerated (possibly due to boost hike and/or other mods) but typical of a standard ECU, it is tuned to pass emission requirements at certain revs.

I'm surprised others with factory ECU's haven’t commented that they feel similar power delivery, as its as obvious as dogs balls whenever you drive a standard skyline.

DSTROY Grand Master

DSTROY

Posted
Posted
SkyHi_33, the problem is your ECU.

The curves are exaggerated (possibly due to boost hike and/or other mods) but typical of a standard ECU, it is tuned to pass emission requirements at certain revs.

I'm surprised others with factory ECU's haven't commented that they feel similar power delivery, as its as obvious as dogs balls whenever you drive a standard skyline.

Its more so the fact that its an auto ECU. My Auto stagea has a similar dyno graph. As soon as the boost is increased the ECU puts in extra fuel and retards the timing :) Manuals don't seem to have the problem as bad.

post-51334-1264249510_thumb.jpg

Krishy Grand Master

Krishy

Posted
Posted
SkyHi_33, the problem is your ECU.

The curves are exaggerated (possibly due to boost hike and/or other mods) but typical of a standard ECU, it is tuned to pass emission requirements at certain revs.

I'm surprised others with factory ECU's haven't commented that they feel similar power delivery, as its as obvious as dogs balls whenever you drive a standard skyline.

i will try and find a dyno sheet scan it and then post it up here.....coz mine was a much much smoother curve when i had the standard ecu in.....i think the auto ecu acts differently to the manual ecu....and the manual ecu gives you better power delivery

wnted1 Collaborator

wnted1

Posted
Posted
i will try and find a dyno sheet scan it and then post it up here.....coz mine was a much much smoother curve when i had the standard ecu in.....i think the auto ecu acts differently to the manual ecu....and the manual ecu gives you better power delivery

Krishy u think if u get a nistune with an auto ecu that it would have a much better power curve or not?

SkyHi_33 Mentor

SkyHi_33

Posted
Posted (edited)
SkyHi_33, the problem is your ECU.

The curves are exaggerated (possibly due to boost hike and/or other mods) but typical of a standard ECU, it is tuned to pass emission requirements at certain revs.

I'm surprised others with factory ECU's haven’t commented that they feel similar power delivery, as its as obvious as dogs balls whenever you drive a standard skyline.

well my mate put the car on the dyno at his work on friday and we had a little mess around with bits and pieces.

turns out that mine was the worst case of rb25 ecu shitting itself that hes ever seen ahaha. the timing was up at 20 to start off with, we took it back to 15 (standard), did a whole bunch of runs on different boost settings and that doesn't seem to make a difference whatsoever.

it seems that every time the car makes boost, regardless of what psi, the ecu retards the timing which makes the boost spike up to 15psi in the mid range, then drop down to set pressure up top where the fueling continues as normal.

we played around with the afm a bit, and didn't really get anywhere. next step for me is to borrow a few things, swap em over and see if it makes a difference.

my afr's were also quite lean throughout the range... still in the safe margin but i might have to look in to upgrading my fuel system soon.

I need to get my hands on:

s1 rb25 manual ecu

s1 rb25 afm

rb25 knock sensor (just in case its not working properly coz that would cause ecu problems)

hopefully the problem is there somewhere. I know that swapping these things isnt going to completely cure the problem, but its better then trying to drive it as it is... power delivery is all over the place :rant:

Edited by SkyHi_33
Krishy Grand Master

Krishy

Posted
Posted
Krishy u think if u get a nistune with an auto ecu that it would have a much better power curve or not?

i would think that it would all depend on the tune of the Nistune mate....as its a chip that goes on the board it will all end up depending on the tune.....and as i have never seen a nistune at work etc i cant really comment on the nistune...

I need to get my hands on:

s1 rb25 manual ecu

s1 rb25 afm

rb25 knock sensor (just in case its not working properly coz that would cause ecu problems)

hopefully the problem is there somewhere. I know that swapping these things isnt going to completely cure the problem, but its better then trying to drive it as it is... power delivery is all over the place :cool:

Might be able to lend it to you marko.....but will be needing them back mate....you will however need the front cover of the ecu....also have a afm that you can borrow as well mate

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