Jump to content
SAU Community

Recommended Posts

excuse my n00bness i only just got it last weekend! but.....here goes,

with my SeriesII RSFour S

when i'm in first, i can hit i think 5500ish RPM then it feels like it holds at 5500RPM,

and i have to change gear.... then second will go past 5500...

has that got something to do with the ECU limiting how far i can push it in first?

or something else u think?

:banana:

Tomas.

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/
Share on other sites

oh i just read a post about 5500 Rpms and the boost dropping...

i'll have to keep an eye on my boost, my rpm and the road all at the same time so wish me luck haha

( or just get a friend to sit in and help )

:blink:

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4632158
Share on other sites

has that got something to do with the ECU limiting how far i can push it in first?

i'm sure the 4WD models don't have traction control, only the RWD ones so it wouldn't be that.

when you say its holds at 5500 rpm does it feel like a rev limit of more of a flat spot? if it feels like a flat spot it could be a few things, could be the intake pipe sucking closed a bit, if you still have the stock exhaust or dump/front pipe you could be feeling the restriction. it also could be the slight flat spot experienced when the VVT switches off (around 5k rpm).

Edited by QWK32
Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4632259
Share on other sites

i'm sure the 4WD models don't have traction control, only the RWD ones so it wouldn't be that.

when you say its holds at 5500 rpm does it feel like a rev limit of more of a flat spot? if it feels like a flat spot it could be a few things, could be the intake pipe sucking closed a bit, if you still have the stock exhaust or dump/front pipe you could be feeling the restriction. it also could be the slight flat spot experienced when the VVT switches off (around 5k rpm).

it did feel more like a flat spot than a limit maybe.. i'll try and figure exactly where and when its happening! :D

actually noticed a small exaust bandage after having a good look, would that be the source if its not sealed 100% ? :)

i think its a 3" exaust system from the looks of it

might have to get some help with this one i'm quite a n00b.

it came with an aftermarket intercooler on the front, with nice shiny pipes :)

aswell as an aftermarket pod filter and a BOV.

i'll keep investigating..

Edited by atomaly
Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633250
Share on other sites

it did feel more like a flat spot than a limit maybe.. i'll try and figure exactly where and when its happening! :D

actually noticed a small exaust bandage after having a good look, would that be the source if its not sealed 100% ? :)

i think its a 3" exaust system from the looks of it

might have to get some help with this one i'm quite a n00b.

it came with an aftermarket intercooler on the front, with nice shiny pipes :)

aswell as an aftermarket pod filter and a BOV.

i'll keep investigating..

LOL.

I still don't know how you got all that passed road worthy (let alone VicRoads).

Do you have the stock ECU or is there a piggyback installed?

Not sure why you need to hit 5.5k in 1st gear though!

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633515
Share on other sites

LOL.

I still don't know how you got all that passed road worthy (let alone VicRoads).

Do you have the stock ECU or is there a piggyback installed?

Not sure why you need to hit 5.5k in 1st gear though!

I like to hit redline in first, it's just fun :D

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633523
Share on other sites

Why? Why not! lol. Besides, the old RB25 doesn't really open up till around 5k rpm.

yeah its a bit laggy down low, really opens up 4.5->6.5 , i was just a bit unsure as to why it wont get deep into the 'nice range' in 1st.

maybe give SSV a call about it??? for my case i'm saying it came with the car stock standard from the dealer :) i didnt do the RW or register it. :D

i'm not sure about if its a stock ECU i'll have a check tonight!

checked my intercooler thismorning.... its a "Blitz" from what it says on it.

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633694
Share on other sites

yeah its a bit laggy down low, really opens up 4.5->6.5 , i was just a bit unsure as to why it wont get deep into the 'nice range' in 1st.

4.5-6.5??

You may want to check if you a "stock" turbo hiding down there.

Don't think Nissan made a turbo with that much lag from factory.

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633711
Share on other sites

4.5-6.5??

You may want to check if you a "stock" turbo hiding down there.

Don't think Nissan made a turbo with that much lag from factory.

how do i know if its a stock turbo or not ? i've never had a turbo'd car b4 :D

its all rather exciting :D

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633806
Share on other sites

Note that he can go past 5000 in other gears just not 1st!

what boost controller is it running? I know the AVC-R that I have you can limit boost by gear, so that could be it - but even if that WAS it , would make no sense as you can still rev past 5000 if you are still making normal boost.

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633883
Share on other sites

Note that he can go past 5000 in other gears just not 1st!

what boost controller is it running? I know the AVC-R that I have you can limit boost by gear, so that could be it - but even if that WAS it , would make no sense as you can still rev past 5000 if you are still making normal boost.

might have to get someone to help me out in this area,

i'm a little bit limited in what i know (n00b :D )

i'm like a sponge at the moment. :D

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633912
Share on other sites

No joke it blows.

Ive done the majority of bolt ons (coil packs, plugs, FMIC, 3" turbo back, EBC, SAFCII, SITC, Coil overs, camber arms, toe arms ect ect...) and its just starting to pull pretty well just if it had a real gear box :'(

Link to comment
https://www.sau.com.au/forums/topic/272870-rpm-and-ecu/#findComment-4633969
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
    • Hi.. Just another problem. So maybe you can help. I(my mechanic) done swap from my RB20DE NEO to RB25DET NEO. Everything is OK but we have a boost cut. Coils/Plugs are ok...AFM is ok. ECU is ok. I have Walbro 255 but it "changed" sound few months ago(you can hear it ouside) you did not hear that when it was new(maybe faulty?) Sooo...what now? What can cause this boost cut? It is even when you standing still...
×
×
  • Create New...