Jump to content
SAU Community

Recommended Posts

Hi guys, from our experience using both engine and chassis dynos (roller) on over 20 Skylines..

Standard R32 GTST

162 kw

220 bhp

110 rwkw

145 rwhp

Standard R33 GTST

185 kw

250 bhp

125 rwkw

170 rwhp

Standard R34 GTT

206 kw

275 bhp

145 rwkw

195 rwhp

Modified R32 GTST

265 kw

355 bhp

210 rwkw

280 rwhp

Modified R33 GTST

285 kw

380 bhp

220 rwkw

295 rwhp

Modified R34 GTT

305 kw

410 bhp

240 rwkw

320 rwhp

Our old RB30DET (with a GTR box in 2wd)

345 kw

465 bhp

280 rwkw

375 rwhp

Whilst the losses aren't perfectly linear they are pretty close, a R32 GTST with manual transmission looses about 52 kw through the drive train, an R33 GTST also with manual transmission losses about 60 kw through the drive train and an R34 GTT looses about 62 kw through the drive train.

It does not seem to matter what the rear wheel power is the losses are fairly constant ie; if you double the power output at the wheels the losses don't double. They go up a little bit, but not even remotely close to linear.

This is a bit of a political subject because it is always preferable to tell people the highest power number possible. So I often here stuff like.........

"My car when standard had 185 kw at the engine and 125 rwkw, now it has 250 rwkw, so it must have 370 kw at the engine. That's 500 bhp". Well, sorry if it deflates some people, but I believe it would really be 250 + 60 = 310 kw (415 bhp).

For the clutchless people, the losses seem to be about 20 rwkw more than for manuals.

Hope that adds to the discussion

Hi guys, let me throw this one in for further thought....

It is accepted that energy can neither be gained nor lost, however it can be converted into other types of energy (that's how brakes work, turning kinetic energy into heat). Of course the Einstein E=MC2 disproves this, but I don't think there is any atomic reactions going on in my Skyline.

So if the losses are linear, where is the extra energy going? It's not "LOST", it can realisically only be converted into heat. If my gearbox and diff heated up at that sort of rate, there would be big lumps of molten aluminium all over the dyno room floor.

Ponder on that for a while

Originally posted by Sydneykid

Of course the Einstein E=MC2 disproves this, but I don't think there is any atomic reactions going on in my Skyline.

E = energy (we all know that one)

C = the speed of light (assumed to be a constant once but isn't)

M = the Mass defect (subtract the 'lost' positron/electron mass from the specific nuclear reaction from memory).

Conservation of energy applies to this equation still.

Thanks Guys it seems to be about 30% or there abouts if you are going to put a number to it . I wanted to know because after putting hks intake pod 3 inch mandrel bent exhaust hks ssbov and 11 psi boost rwkw only showed 165kw and i thought great thats only 10 % more than stock but its more like 20% more

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


  • Similar Content

  • Latest Posts

    • Wideband is worth setting up if only for tuning purposes. I would not mess with the ignition system unless there's a misfire. HKS crank trigger is popular out here for the relatively easily sourced Denso crank sensor, not a bad idea to install as well regardless of power level on a standalone. Boost leak test is worth thinking about. Oil pressure sensor tied to a fuel cut isn't a bad idea either. Getting the tune figured out is a good idea. Without putting eyes on it and getting under it there's no way for us to tell you exactly what it needs but most likely you're down to the last 10% that will make a big, big difference in how happy you are with the car.
    • Doing a refresh of my 33 and can see a few websites stating they sell the entire main carpet for our cars, but they all have generic photos which is fine, i understand they are custom made to order.  Just seeing if anyone has got it done or had any experience with this, as i would only want to do it if the fit and finish was as good as oem https://carmatsdirect.com.au/products/moulded-carpet-or-vinyl-for-nissan-skyline-r33-1993-1998-coupe https://knoxautocarpets.com.au/moulded-carpets/nissan/skyline/skyline-r-33-1993-1998/
    • Any plans for E85? If so, add flex fuel sensor.   I'd probably add in the sensors I mentioned above if the Link will support using them for engine protection. With water pressure, you need to be able to effectively set it that "If temp > X, and pressure = atmospheric, shutdown" as at running temp, you should be able to read pressure in the cooling system. If pressure suddenly disappears, it means the water went some where, and this is a quicker reaction than waiting on water temp to go up (Which, can take a little longer than you'd like, considering it now has to wait for hot air to heat it up) Oil pressure, Oil temp, both would be on my list too if you're looking to add sensors. Wideband O2. And at least one EGT sensor. If you're feeling deluxe, put in individual runner EGTs. Single EGT sensor is more so forget about a specific number, get used to "What is normal EGTs", and then keep an eye on it, if it starts going away from "normal" it's a sign something is wrong (Also, things like the tune can still start going out of spec, but EGTs may not show it, for example one injector starts running leaning, so ECU richens everything up, now 5 out of 6 cylinders are rich, and running cool, with one cylinder lean and running hotter, so it's not perfect) Then there is your other things to look at non sensor related, but you may have already done, or have underway, and that would be things like building a sump for more oil, and better oil control under high G-Forces (Cornering, brakes, acceleration). Basically, the above is worth looking/thinking about, if the ECU can do protective stuff with it, and you continue to use it how you are (Drive it to the track, thrash it, drive home, repeat once every 3 to 4 months)
    • Can also confirm these work a treat for most balljoints and bushes. If you have access to a big rattle gun, they make the job so much easier and quicker, compared to using a socket wrench or shifter on the c-clamp 👍
    • Its sort of street but got used for circuit sprints on account of I never drive it on the road because I dont have the time to spare. So it usage was sits around for months at a time then gets driven either 50 or 250 kms to the track followed by 20 laps followed by 50 or 250kms home followed by stuck in the shed until next time. So yeah neither fish nor fowl. Just dont want to break it on the track as a preference. Hence the fairly short sensor/mod list. Probably more worried about it pinging itself to destruction more so than anything oil related.
×
×
  • Create New...