Jump to content
SAU Community

Rb25 Slow From 5000rpm Onwards

islade

By islade,
in Engines & Forced Induction

 Share

Recommended Posts

islade Rising Star

islade

Posted
Posted

Hey guys, I have a 1993 R33 Skyline.

I recently had it converted to manual, at the same time, i had a full service (inc spark plugs), new timing belt and water pump (by NisPro).

The car has 3" catback exhaust, turbotech manual boost controller set at 10psi, VeePort BOV and a HKS mushroom air filter, stock ecu and smic.

When flooring it, the car seems to pick up nicely around 3-4000rpm, but once it gets around 5, the boost guage still reads 10psi, but the car seems to take noticeably longer to get to 7rpm than from 3 to 5rpm. I had a friend with a 32 drive it, and he confirmed, from 5000rpm i've got nothing!

The car isn't hesitating/stuttering/making funny noises, it just seems like it's n/a from 5000rpm onwards.

I'm wanting to work out what's wrong. Jez suggested it could be my coil packs. After reading a few threads on SAU about them, I think i'm going to try and find a working pair to test that theory, what else can i look at?

Thanks guys :laugh:

Isaac

Link to comment
https://www.sau.com.au/forums/topic/246451-rb25-slow-from-5000rpm-onwards/
Share on other sites
RB JET Apprentice

RB JET

Posted
Posted (edited)

I had the same problem in my 33. My ecu was richening a/f mixtures and retarding timing. Power FC and a good tune fixed me up, but if i were you id get it on the dyno and get the problem diagnosed that way. Itll save you a lot of money in the long run.

Edited by RB JET
nuclear_skyline Mentor

nuclear_skyline

Posted
Posted

very well could be the bad rich and retard thing... too much air coming in so the stock ecu craps itself - dumps heaps of fuel in and pulls all the timing...

Pal Veteran

Pal

Posted
Posted

i done a manual conversion 3 years ago and have only just changed my ecu to a manual one(had SAFC2 fitted). it done nothing to the power when flooring it, only cleaned up idling and cruising. you need to get yourself at minimum a SAFC2 and get it tuned.

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

    • Duncan
      After market rear camber arm adjustment

      By Duncan · Posted

      Then, shorten them by 1cm, drop the car back down and have a visual look (or even better, use a spirit level across the wheel to see if you have less camber than before. You still want something like 1.5 for road use. Alternatively, if you have adjustable rear ride height (I assume you do if you have extreme camber wear), raise the suspension back to standard height until you can get it all aligned properly. Finally, keep in mind that wear on the inside of the tyre can be for incorrect toe, not just camber
    • V35Newbie
      After market rear camber arm adjustment

      By V35Newbie · Posted

      I know I have to get a wheel alignment but until then I just need to bring the rear tyres in a bit they're wearing to the belt on the inside and brand new on the outside edge. I did shorten the arms a bit but got it wrong now after a few klms the Slip and VDC lights come on. I'd just like to get it to a point where I can drive for another week or two before getting an alignment. I've had to pay a lot of other stuff recently so doing it myself is my only option 
    • Duncan
      After market rear camber arm adjustment

      By Duncan · Posted

      You just need a wheel alignment after, so just set them to the same as current and drive to the shop. As there are 2 upper links it may also be worth adding adjustable upper front links at the same time; these reduce bump steer when you move the camber (note that setting those correctly takes a lot longer as you have to recheck the camber at each length of the toe arm, through a range of movement, so you could just ignore that unless the handling becomes unpredictable)
    • V35Newbie
      After market rear camber arm adjustment

      By V35Newbie · Posted

      I got adjustable after market rear camber arm to replace the stock one's because got sick of having to buy new rear tyres every few months. Can anyone please let me know what the best adjustment length would be. I don't have the old ones anymore to get measurements. I'm guessing the stock measurement minus a few mm would do it. Please any help on replacing them would be fantastic I've watched the YouTube clips but no-one talks about how long to set the camber arm to.
    • GTSBoy
      Unpeeling the Orange

      By GTSBoy · Posted

      Heh. I copied the link to the video direct, instead of the thread I mentioned. But the video is the main value content anyway. Otherwise, yes, in Europe, surely you'd be expected to buy local. Being whichever flavour of Michelin, Continental or Pirelli suits your usage model.
×
×
  • Create New...