Jump to content
SAU Community

RB20DE NEO accelaration/cruising "problem"

Kapr

By Kapr,
in R Series (R30, R31, R32, R33, R34)

 Share

Recommended Posts

Kapr Enthusiast

Kapr

Posted
  • Author
Posted (edited)

It is factory manual(5 speed)

The lag is "most" noticeable on 4th gear but it can stil "lag" on 3rd or 2nd...but on the 2n/3rd it is really like "milisecond" loss of power but gas pedal reacts normally.

And it not do that all the time...the "loss of power" is only sometimes and the "i dont know what you want me to do" on 4th is happeing often like the just do not react to the gas pedal(it reacts i can feel/hear it but like nothing happens for a moment)

But as i said it i only a cruising problem and when i try to maintain the speed. 
When i drive it "harder" the car behave as it should...



 

Edited by Kapr
joshuaho96 Veteran

joshuaho96

Posted
Posted
16 hours ago, Kapr said:

It is factory manual(5 speed)

The lag is "most" noticeable on 4th gear but it can stil "lag" on 3rd or 2nd...but on the 2n/3rd it is really like "milisecond" loss of power but gas pedal reacts normally.

And it not do that all the time...the "loss of power" is only sometimes and the "i dont know what you want me to do" on 4th is happeing often like the just do not react to the gas pedal(it reacts i can feel/hear it but like nothing happens for a moment)

But as i said it i only a cruising problem and when i try to maintain the speed. 
When i drive it "harder" the car behave as it should...



 

You really need a diagnostic cable and logging of core ECU parameters to get to the bottom of this. 

  • Thanks 1
GoHashiriya Community Regular

GoHashiriya

Posted
Posted

In my experience the MAFs are pretty robust in these, mine is original and with 255k on it. I did re-sodler the joints at one point but that wasn't my issue, it was the CAS. I would even take a punt at getting a used original MAF from yahoo auction if mine was suspected of funny business - there's one right now at about EUR 50. 

You said your coils were splitfire, but how old are they? They will fail just like the OEM ones and many have 100k+ kms on them now. I thought splitfire went out of business a while ago?

The parts GTSBoy mentioned earlier really shouldnt be too expensive. I went ahead and just threw those exact parts at the car for preventative maintenance - OEM coils/plugs/harness, soldered MAF, rebuilt CAS and Walbro - and, touch wood, it's running fine. 

All this stuff won't be so expensive and you should really expect to replace them anyway on a 25yr old car. 

  • Thanks 1
Kapr Enthusiast

Kapr

Posted
  • Author
Posted (edited)

@joshuaho96 Do we need any "special" software? I know(99%) that the car has no OBDII port and that i have some extension cord to the interface to OBDII
 

@GoHashiriya
Can you send me the link? I do not see that(it is friday so maybe it was sold)
Yeah they were used but i dont know how many km they done but i presume that if some of the coils gone bad the car would run on 1/X cyl less same as the problem with the connector?
As for the parts...yeah coil are old splits...plugs and harness is brand new...MAF is OEM and upon inspection looks good...connector to that too. CAS i rly dont know(can it do that?)

For the info i have.
I took the car to the highway and the symptoms are that most noticeable "lack" of everything on 4th and 5th gear.
When i try accelerate just a little...the car and the engine change sound like it want it to do something but nothing happens...sometimes it start to accelerate but sometimes it does not...when the car changes the sound but it does not accelerate i would describe that sound as...some type of "chooking" or breathing? The sound is differenet and it changes to "normal" accelerating sound soon as the car starts to accelerate...maybe stuck/dirty throttle body?

BUT if i put "pedal to the metal" car behaves normaly and all those "problems" above are nowhere to be found.

IT IS really only when iam trying to maintain the speed or slightly accelerate.

Edited by Kapr
  • 10 months later...

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      r34 Skyline 25 Gt four GTR conversion (ENR34)

      By GTSBoy · Posted

      Greg speaks wisdom. These dirty old Datsuns are only value when they are cheap. When they are not cheap, there is no value. Sounds contradictory, but it's true. We are now 20 years past the hey day of modifying cheap 90s JDM cars for small amounts of money. This is a different world. If you are rich and can afford not to care about what is effectively wasting money on an old Datto shitter, then I have no reason to argue against it. But if you are wanting to experience what we all experienced back in 2005 (and I bought my car last century!) then there is no way to do it.
    • Kinkstaah
      r34 Skyline 25 Gt four GTR conversion (ENR34)

      By Kinkstaah · Posted

      Short answer: No. Medium answer: No, because you still need to conjure the things out of thin air to bolt them to a NA to make it a NA+T. Long Answer: No - The things you need to conjure - meaning a turbo, intercooling, manifolds, exhaust, intake/manifold/piping, clutch, injectors, fuel pump, AFM (?), ECU + Wiring (woo, N/A loom fun) have to come from somewhere. You could have many scavenged these things from an OEM car that someone had upgraded from and use some of these. This will be cost prohibitive now, especially so in the USA. You'd probably pay the same for newer, upgraded components that are better than old OEM stuff from 25-30 years ago. None of these big ticket items are re-usable for the N/A car. Why not buy new and upgrade while you're there? The only real consideration is turbo and fuel sizing and determining whether you want to stay within the bounds of the OEM engine or get into rebuild territory. These limits ARE lower with a N/A motor and especially N/A gearbox at the starting point. And if you're gonna upgrade those then you may as well consider having them built to begin with. Because everyone here knows you're never far from that next engine rebuild once you start making the power you want... The cars you see on the internet and SAU etc have been built over decades. If you're really clued in... you would sell your US car to somebody for what you paid for it. You would then scour AU JDM pages or SAU and buy a car like Dose's on this forum with your powerful American Dollar. This will save you so much money in the long term. Importing it could be tricky. Or it might not because USA. I have long said the only reason 90's Japanese stuff took off was because a) Japanese people had Japanese cars so that is what they used b) Australians could import these cars to Australia with very minimal changes and use them on the road here c) Neither country had well-priced access to US or EU Sports Cars. I don't believe the JDM scene would have taken off in Australia at all if we had EU priced EU BMW M offerings, or more especially the AUS V8 Scene would never have existed if we had the multitude of US cars like Camaros, Mustangs, Corvettes at the prices you folks do. After all - Do the math. I would say put a V8 in your R34 and that's the smart way forward. It is. I did it. I know this from my own experience. But at that point there's no reason to simply not buy a C5 or C6? It would be simpler and easier and cheaper and bette-
    • AdiR34
      r34 Skyline 25 Gt four GTR conversion (ENR34)

      By AdiR34 · Posted

      Reading all this... hurts lol. I have an ENR34 5MT and I paid an inflated USA price for the car alone, had to do tons of preventative maintenance past that, and so I'm over $30K USD into the car already and haven't even touched power.  I wanted to +t it. Not even trying to make GTR numbers, I'd be happy with 250hp.  Can I get away with paying much less to make that happen?
    • Milkmun
      The Evolution Of "night Fury"

      By Milkmun · Posted

      Damn you’ve done well, definitely snapping necks.
    • acsplit
      SAU VIC Motorkhana Saturday 14th June Winton + Entry List & Accomodations details

      By acsplit · Posted

      Great weekend and event. Open fire at the caravan park, perfect weather all day and a great feed and a couple of drinks at at awesome country pub.
×
×
  • Create New...