Jump to content
SAU Community

4 Wheel Dyno Kw And Rear Wheel Dyno Kw

PhilGTR

By PhilGTR,
in Forced Induction Performance

 Share

Recommended Posts

PhilGTR Rising Star

PhilGTR

Posted
Posted

Hey guys

I got my car dynoed again today and I just want to try and clarify the difference between rwkw's and 4wkw's on GTR's.

The last time I got it done on a rwd dyno and it came up as 253rwkw at UAS.

Today I have the same mods as last time but just adjusted the boost response i made 257kw @ all 4 wheels at CRD.

Now Jim at CRD said to me the difference between rwd and 4wd is around 30kw give or take and that sounds a bit too much to me. When i tested my car today, it felt like maybe at max an extra 10-15kw at the wheels difference(but thats just my judgement). I also read somewhere here people were saying around 4% difference between 4wd and rwd for r32gtr's.

Also last time my stock injector duty cycle at full power were at around 80-82%.

Now Jim reckons I wont be able to make anymore power safely because of my injectors maxing out which I assume would at least be 90% plus? But need to confirm this later.

Stock injectors max out at around 280rwkws or so?? So does this make sense to assume its around a 4-5% loss between rwd and 4wd? Opinions wanted please!

Cheers

Link to comment
Share on other sites
GTRsean Grand Master

GTRsean

Posted
Posted

Talked briefly to Mark at Hills motorsports Castlehill the other day and he said he sees 20-25 kw difference in RWKW and AWKW.

He has a 4WD dyno dynamics dyno by the way.

Link to comment
Share on other sites
Leewah Veteran

Leewah

Posted
Posted

I had my car dynoed at Melbourne Autosalon in both RWD and AWD within a span of 24 hours of each other and no changes were made to either the dyno or the car except for the removal of the driveshaft.

In AWD, my car made 604awkw and in RWD, the car made 617rwkw.

Regardless of how the dyno was configured intially, all the settings for both the dyno and the car remained the same. The only thing which changed was the ambient temperature and humidity in the Melbourne Exhibition Building which would be considered as negligable.

Hope this info helps.

Link to comment
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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Duncan
      Walbro 460 in r32 gtr

      By Duncan · Posted

      I've been running a 525 for years with the standard hat and FPR in the stagea (mine has a 32 gtr fuel rail and stagea and 32 hat and tank setup are the same) without an issue with base fuel pressure. You said when you disconnected the return it is OK, did you do so at the fuel rail or the fuel hat? Either way I'd be looking for blockages or in the case of the tank kinks in the lines downstream Note I did however have an issue with the current required for the 460 melting the fuel hat.
    • portaz
      Walbro 460 in r32 gtr

      By portaz · Posted

      I'm trying to maintain stock appearance . Hicas is still installed (although has lockout kit) did you retain factory fuel pump hat? If so I assume you used a bulkhead fitting or similar ?  I was also trying to avoid a full re design as it was previously dynoed at 426kw atw with same setup but different pump. Changing return line would also mean having to change ethanol sensor and fpr and possibly fuel rail. Not chasing more power in any way just reliability of the setup 
    • Chris_Guthrie
      Misfire/stalling issues

      By Chris_Guthrie · Posted

      I do think it's weird I had it for 2 weeks then the issue came up out of nowhere and progressively got worse. I would've imagined changing everything in the ignition system would've resolved any ignition related misfires but still has the high rpm and idle misfires that seem unchanged. I would've thought if it was fuel related it would happen all the time unless it's the pump losing pressure when it gets hot. If it was the ecu I would think it would do it all of the time.  Something I noticed when I had it all apart was a pretty decent coating of oil in the J pipe coming from the throttle body. The weird thing about that is the pcv that goes to the intake is blocked off. So that has me wondering if the oil is coming from the turbo because that's the only thing that could get oil in there. This thing does sound like it spools like a mofo like I'm a former dsm guy and the only stock turbo I've ever heard spool this loud (to only go up to about 5psi) is on a diesel truck. And the recirculated bov is really loud too I had a TurboXS RFL and this thing is just as loud and being so low on psi seems a little weird. I don't know if any of this is or isn't related but just trying to make sure I'm not leaving any potentially helpful information out. 
    • Chris_Guthrie
      Misfire/stalling issues

      By Chris_Guthrie · Posted

      So latest update. I replaced the ignitor with a jspec unit from enjuku. It felt a lot better at first although it is a little bit cooler of a day than it has been. Warming up didn't have as much misfire sputtering as before. Went on a 10m test drive. Felt good, a lot stronger though I was taking it easy on the boost. On the return trip started getting the cutting out at higher rpm again and was getting worse the longer I was driving. Took it easy the rest of the way home. Before turning the car off was getting the normal idle sputtering I was getting before.  So where I'm at now, entire ignition system has been replaced with upgraded components. Plugs still gapped at .8mm. Removed the fuel cap in case it was building too much reverse pressure I'm the tank, didn't help at all. Now I'm still on the same tank of gas the fuel treatment was in, I'm thinking if I can run that out and then refill with fresh 93 maybe  the treatment is too concentrated in some areas but doesn't explain that it only does it once the car is warm. I'm leaning towards fuel pump or injectors but if the injector was clogging I don't think it would make it shut off like it has but then fire right back up like nothing happened. So my current guess would be the pump. Without a fuel pressure guage no way to test or check it while it's running.  So that's kind of where I'm at. Need to start testing fuel components and ecu/wiring but I'm at a loss of what's the next logical step and procedure for testing it. 
    • couchboy
      R32 skyline gtst 2wd swaybar end links

      By couchboy · Posted

      @niZmO_Man thanks for that info, lucky I bought the gktech ones 🤙.
×
×
  • Create New...