Jump to content
SAU Community

All happy now.....Car is fixed (Speedo & HICAS)

BOOSTMEISTER
 Share

Recommended Posts

BOOSTMEISTER Mentor

BOOSTMEISTER

Posted
Posted

For all those who offered their ideas for fixing my car...THANKS.

In the end I found that the plastic bit on the end of the speedo cable behind the dash had come away from the cable there for it couldn't turn the speedo. I got a new cable assembly and replaced it.

This also fixed my hicas problem. Turns out that the HICAS needs a speed signal to opperate so once the speedo started working so did the HICAS.

Thanks again for all your input.

meggala Grand Master

meggala

Posted
Posted
R&D to try and prevent Boost drop to 11-12psi when above 6000rpm, without a EBC.

joel cam and I have similar theories on this and that is you need to strengthen the wastegate actuator hks make replacement ones for the rb20 and rb25 and I think rb26. its a trick problem. I had it with vg 30 upon rebuild I'm asking for the p[roblem to be addressed. the other issue could be in the turbo design with the exhaust wheels and houseing not being big enough.

meggala

BTW Cam glad to hear you got the probelm fixed. good work

Cubes Grand Master

Cubes

Posted
Posted

I've been told 100 times that it is the std small turbo running out of puff up top with the bleed setup so really to fix it with a bleed setup some how i would need to implement a type of variable bleed setup?!?!

Which would obviously be pretty rough as there is no electronics involved..

I don't think that I will be able to stop the boost drop with just a bleed setup..

I will definately look in to what you said btw...

So what you are saying by strengthing the wastegate actuator is that the waste gate is actually being forced open and the spring is unable to hold the pressure that is being developed within the turbo?

meggala Grand Master

meggala

Posted
Posted

thats it exactly now a quick way to fix the problem but you still get a bit of drop is to put a restrictor in the ine I did this on my vg30 .before the restrictor I got 12-13 psi which dropped to 10-11 over 6000 rpm with it I got 16 psi but it dropped back to 12-13 @ 6000 rpm.

driving with a standard rb20 turbo now I can really feel the difference between that and the vg30 the car feel so sluggish above 6000 rpm its not funny and I don't think boost is going to help I haven't fitted a bleed and the car is running 10 psi with the fmic etc.

meggala

meggala Grand Master

meggala

Posted
Posted

the vg30 has heaps more punch @ 4000 all the way to 7800 but untill 300 there isn't much (on my car in the old configuration)

this is the dyno result from when I had my car on 10 psi and it jumped the rollers look at the sharp rise. no reading from 5k rpm onwards.

http://www.meggala.com/images/1turbodyno1.jpg

http://www.meggala.com/images/1turbodyno2.jpg

meggala

you will see what I mean about a steep curve

taken 2nd gear in an auto.

top speed in second in the auto was 125kph @7500

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
      Cas issue

      By GTSBoy · Posted

      The wideband reading is meaningless if it's not running. Why are you using shitty old sidefeeds on any engine, let alone a Neo? What manifold and fuel rail are you using to achieve that? Beyond that, can't help you with AEM stuff as I've never been their ECU/CAS combo.
    • Duncan
      RB26DETT Sketchy boost mod?

      By Duncan · Posted

      Manual boost controllers (where a little of the boost was bled off) were quite common back in the day, because they were cheap and easy. Generally they had a manual adjustment screw rather than being fixed like yours. Down side is they always bleed boost, not just when you want them to so an electronic boost controller that uses a solenoid will have less lag.
    • nash47
      Cas issue

      By nash47 · Posted

      Hello , im new here and i have A31 home build  RB25det neo stock eng / turbo  aem ems 2 blue connector  aem 3.5 map aem cas disk aem wideband connected to ecu  355 lph pump 550 nismo yellow injectors side feed aftermarket regulator  and won’t start with base aem tuner basic tune eventually flipped cas 180 degree so it triggers on correct stroke not in exhaust cycle  Now it won’t start Wideband reads 10 and 11 at lowest fuel setting  and will share calibrations soon for aem tuner i think something is wrong in aem tuner    please if you have any information, am very grateful         
    • nxh
      R34 4 door side skirt identification

      By nxh · Posted

      Legend. I ended up finding the facebook account of the owner of the first car i sent but sadly he deactivated the account. I think you’re right in saying it’s some sort of well done custom job. Really appreciate your help anyways.
    • GTSBoy
      boost source Size Garrett gt28 gen2

      By GTSBoy · Posted

      Totally equivalent. Stock often goes from the comp cover because that's where the actuator is also installed and the factory needs 2" of hose to make the connection - and it comes as a pre-assembled unit. They totally have a boost reference from somewhere between the turbo and the throttle(s). Oh, jeez. Just do it in M12 then. We don't actually care that much. I would expect any such AN converter fitting to rely on an o-ring or some other seal onto a flat surface under the flange of the hex**, because bolt threads are no intended to provide a pressure seal. unlike..... pipe threads. **which also requires a suitably flat and smooth surface on the turbo's boss to provide the seal.
×
×
  • Create New...