Jump to content
SAU Community

S2 Rb25Det Falls Into A Black Hole At 6000Rpm

Ad's

By Ad's,
in Engines & Forced Induction

 Share

Recommended Posts

Ad's Mentor

Ad's

Posted
Posted (edited)

Hey guys

I have installed a S2 RB25DET into my HR31 coupe over the last few months i regoed it over a month ago and all is good, pulls nice and seems to drive like it should. I gave it to a local tuner to put her on the dyno and run it up to see if there is any problems turns out after 9 power runs everytime at 6000rpm and making 140rwkw it drops off, he said they usally drop off a little bit but then pick up and goes to the red line as mine doesn't.

Fuel is rich and it isn't leaning out.

No vac leaks or boost leaks.

The motor isn't breathing oil.

Timing is right.

AFM seems to be in good working order.

CAS seems to be in good working order.

He seemed to think the timing belt had jumped teeth and told me to check it, i thought if the belt had jumped over it would be running bad all the time and not just at 6000rpm. So i checked the timing belt and all the marks line up.

I went over my wiring and from what i have wired it up from it's correct.

The CAS isn't off centre as the timing is back to 15 degrees at roughly 850 rpm on idle.

New splitfire coilpacks less than 1500 km old.

New NGK copper plugs pre gapped to .8 less than 1500km old.

Before the motor went in it had new oil and filter, fuel filter, coolant and flush, water pump, timing belt and a boshi 040 installed.

Im taking the car back on Friday to have a some more work done with re run with a mates S2 computer, as i have a mate that works at the tuners shop and he reckons it might be ecu related.

The motor is pretty much stock apart from:

FMIC

Greddy profic type II boost controller (witch is off currently)

Boshi 040

3 inch exhaust with a centure muffler and rear muffler

Splitfires

Im thinking of getting a tune done with a power fc but im pretty sure my problem will still be there even with the new computer and tune.

As you can see im all out of ideas.

Any ideas or help will be great!

Cheers

Adam

Edited by Ad's
The Mafia Grand Master

The Mafia

Posted
Posted

dude.... 140rwkw and beyond is the rich and retard maps in the factory ECU.

TUrn your boost up and I bet it hits this hole a whole lot earlier.

Get a tunable ECU, its a known fact that the factory ECU is useless for anything above stock power.

You are wasting your money trying to "fix" the factory ECU.

Powerfc...

Ad's Mentor

Ad's

Posted
  • Author
Posted

Boost controller got turned off as it was only making it run worse! And its still off currently! I will be looking at a power fc soon when i don't have a lack of money.

The VCT is working as it clicks and my mate pointed it out when it was in there!

Thanks

Ad's Mentor

Ad's

Posted
  • Author
Posted

Apparently its my air flow meter in the cooler piping! It's going back in a week or so when i have moved it back and seeing it it changes anything!

islade : I borrowed a mates manual computer and it didn't make a difference.

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

    • Black_CSR
      Wheel Sizes & Offsets For Skylines

      By Black_CSR · Posted

      Yeh I think i'll message an old contact i had for ages that manages his own tyre shop now.. n tell him what i want n work with him before ordering..  Got this 17x9 +30 Driftteks on 245/45/17 PSR Drag Radials on the rear.. They fit well - for your reference in future - Rear guards  have been lipped in & minimal to non flaring of the rear Gaurds.    
    • Kinkstaah
      Wheel Sizes & Offsets For Skylines

      By Kinkstaah · Posted

      If only it were that easy! I also needed to remove seats, shocks, brake calipers, send my car through a fence, and use measuring and ended up guessing because I didn't remove seats, shocks and brake calipers. It can be hard sometimes Can be a little more complex than 'just measure' if you want to truly measure the entire wheel through all of it's suspension travel. But if you aren't going for every last mm then yeah, you can check the space you currently have and guesstimate.
    • GTSBoy
      Wheel Sizes & Offsets For Skylines

      By GTSBoy · Posted

      If you own a car, and it has wheels on it, and you know the offset of those wheels, and you have a measuring device, you have everything you need to work out if other wheels will fit.
    • Black_CSR
      Wheel Sizes & Offsets For Skylines

      By Black_CSR · Posted

      Will this fit? but they are staggered set - RAYS 57DR SEMI GLOSS BLACK 18x8.5 +37 | 18x9.5 +38 5-114.3 STAGGERED SET   or If no go could just get a set 4's wheels of 18x8.5 +37 5-114.3 - would i run 8.5's 235s up front n 245's at the back if I do?   Thanks.        
    • MBS206
      MAJOR FUEL ISSUES 25det neo r32

      By MBS206 · Posted

      Put a clamp on your return line. I have a feeling it's sucking air, and introducing bubbles to your fuel. With a lot of fuel, less problematic. I'd honestly be redoing all the lines in the tank and clamps on everything.   Also, you've given two different answers to the same question: Asked if being followed by the police you could get down to use the whole tank, you said yes you could, so long as you keep off boost. However, you then followed this up that free revving, it would also cause the issues. I'm doubting free revving is enough to make any noticeable boost on what is likely a decent sized turbo.   So now I have to ask, can you actually drive it lightly and use all the fuel, or does it break up even free revving? Also, have you put a fuel pressure gauge on it? Can you hear the pump change noise at all when you're having this issue?
×
×
  • Create New...