Attended the Dyno Day today, down at Pro-Tek Automotive. Was rapt with the results, 132.6kw's at the wheels! Ended up with 156.3kw's at the flywheel, too, which made me happy, seeing as though I thought I had a sick engine. :-Z Only got photo's at the moment, going to scan the sheets in for my profile soon... Will have photo's of the day soon, too. Was good to see everyone there, although it was a bit overwhelming trying to remember so many real names and screen names all at once, especially trying to decypher what people were saying over the raquet of the engines. :>< Saw a couple of other cars run too... An R32 GTS-T Skyline which only seemed to grab 140rwkw (heh heh heh ), and a WRX which didnt do too much higher, from memory. Also a 180SX which peaked at just a smidgen over 200, it sounded like a beast, and "made fire" (says krystal ). No s$!t though. Fire out of the exhaust. Looked awesome! Also saw Cletus' (John) beast run, but I won't give away his figure... He can tell you himself. Kicked arse though!!! ^D^ ^D^ ^D^ Waiting on red32's (Doug) results too, and also curious to hear how the N/A Supra went... I'd like to compare how I went against that. Ok, this has turned out to be a long post... So I'll leave you all with my results and a goodnight! :YD >D< :-Z [image]http://www.tradeguys.com.au/mathius/300ZX-dyno_printout_closeup.jpg[/image]</img> [image]http://www.tradeguys.com.au/mathius/300ZX-dyno_printout.jpg[/image]</img>
137.2Kw@168kph Interestingly, the auto(mine) lost less at the wheels (7.64Kw) than Cletus's manual(9.3Kw) and your (was it 8.6?). Go figure. Best of day was a R32 GTR @ 247Kw. A Promise: "No longer will I demean Tay's Suzuki, neither will I embarass myself and all N/As by attempting to outrun it." (about 120Kw from memory, and a speed on the roller of 240kph, not bad for 1.3L. Thanks for letting us know of the event, Rob. And to Shaun Chiew of Exclusive-Auto club, well organised and run.Cheers, Doug
Sounds like a good day!>> How did they get a Flywheel reading:?) Did they just calculate it, if so they are wrong IMHO. 132.6rwkw = 177.8rwhp which suggests that you should have 177.8fwkw/238.4fwhp.Cheers mate Lloyd :-Z >D<
I don't rightly remember, except for being somewhat disappointed. I don't thing it was over 130, but maybe Jedi, or Tay can remember.
They do a power-loss calibration then a separate run for each of the two power readings, ie rw and fw. So many cars, so little hearing left!! Cheers, Doug
Cars in Sydney lose 25% approx.> between flywheel and rear wheels.:s :s I don't know how that can differ elsewhere, even the DynoDynamics Techs work on those calculations up here.:?) :?) :?) :?)Effectively, rear wheel HP is numericaly equivalent to flywheel kW, i.e. 300rwhp = 300fwkw. Cheers mate Lloyd :-Z
Interesting to note that their drivetrain >> loss figures were significantly less than the often quoted 25% for manuals, 33% for autos, or the other assumption that rear wheel bhp will roughly equal flywheel kW.I think I will put my Z up for the next run, without any engine mods since Simon's dyno day. This might give us an idea of how the two dynos compare. Shaun said they will be doing another Saturday in around 4-6 weeks.
But has that 25% figure ever been proven >>> on a Z? On any car? Or is it simply an approximation? Only way I know to quantify actual drivetrain loss would be to pull the motor and have a run done on a motor dyno to compare with a rolling dyno.My car wasn't dynoed today, but what they were doing was putting the car on the dyno, running it up to 95kmh, then putting it in neutral and letting it coast to a halt. Repeat the exercise. Presumably their software then calculates how long it takes to slow down - slowing quickly would indicate higher frictional drivetrain or road losses. This also removes the blanket factor applied to each car as each car attains its own drivetrain loss figure.It might be that our cars don't make as much flywheel horsepower as we like to think. Anyway, the dyno system is still only an individualized software generated estimate, not a statement of fact.
Some pics and more info Was a good day, if only there were some chairs lying around. The zeds present did well.. Cletus got a nice healthy number which I'll let him tell everyone about, and so did Ty and Doug with their NA's. In answer to your question Ty, the Supra only managed a 115 rwkw so you're still infront. Infact, you're currently the highest for the NA 6's. What I found surprising was the calculated drive train loss. This Dyno calculates the drive train loss for, and lets just say it was a hell of a lot less than the 25-30% that we mention on this forum. Is the dyno wrong, or is that 25%-30% value a myth??? Has anyone proven it??? Anyway, here are some pics. I have many more, but cant be bothered showing them all. Nothing to special about this corolla, except that its had HEAPS of cash spent on it, and now packs a supercharger along with some big chunky brakes. STill only managed 100rwkw. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/1.jpg[/image] Ty's (Mathius) car on the rollers.... [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/2.jpg[/image] Ty's competition. His girlfriends brother's VN commodore... Yes, Ty did come out on top. The commie got about 102rwkw. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/3.jpg[/image] This beasty 180sx with an SR20 got a nice 197rwkw. Engine built by Pro-tek who were the guys operating the dyno. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/4.jpg[/image] and this is the SR20 up close.... [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/5.jpg[/image] Nice black R32 GTR. This was the highest for the day with 247rwkw. It has minimal mods. Spoke to the owner and he said they had to back off at 6200Rpm cos it was pinging for some reason. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/6.jpg[/image] How well do I know my skylines??? This is an RB26DETT???? am I right?? [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/7.jpg[/image] This is a little Mirage. The difference being that its worked and packs 140rwkw in such a light small car. I'll remember not to pick on this thing on the road.. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/8.jpg[/image] Tays little beasty. For those that dont know Tay, he was a NA zed owner, but unfortuneatly his old NA gave him more grief than fun. He now has this little beasty.. Suzuki swift with a turbocharged 1.3 ltr engine. 100rwkw. Oh, and his car only weighs about 800kg's, so its another car I wont harass on the road.. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/11.jpg[/image] Doug (red32) on the rollers..... [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/9.jpg[/image] Who are these clowns??? They just started following me around.. [image]http://www-personal.monash.edu.au/~mbiondo/dyno2/10.jpg[/image] Was a good day. Intend to get my car on the dyno next time.. Who knows, maybe I'll win a trophy??.. Cheers
The guys in the states.. tend to be experiencing different figures to what we conventionally expect. They usually quote the losses as being closer to:Manual Z32: 15% loss. Auto Z32: between 25 and 35% loss.In my opinion these figures make a lot more sense and might make the flywheel figures calculated by the dyno seem slightly more accurate.However, I can't remember where these figures came from or whether they are factual or not.Pat
209. rwkw @ 12psi 238.9 kw @ flywheel with around 10.5kw drivetrain loss @ 95 kph. I was hoping for around the 200 at the rear so it was better than I would have been happy with. I actually thought it might be a little higher given the mods on the car and the rough figures quoted on TTZ page for the mods very similar to mine. Was surprised the boost wasnt a tad higher as Joe guestimated around 14.Gonna try and get a loaner Hitek ECU before the next run and see if that makes any difference and maybe get that extra 2 psi boost.Thanks to Rob for posting the details here and to Shaun from exclusive for organising it.
Personally, I don't know how that > "approx. 25% loss" has been arrived at, but a figure of around 5% loss (Cletus) is just not possible IMHO. I beleive all these cars had a higher flywheel figure than calculated. What I DO know is that it is accepted by Motor Engineers, Mechanics, Engine Builders, Dynomometer Technicians/Manufactures, Tuning Shops, and the list goes on...and on...and on! Not just recently, but for as many years as I can remember. I question the accuracy of the method used in this instance, as an engine with higher compression would slow down sooner than one with less compression, therefore NA's would indicate a larger power loss at the rear wheels, than would a TT. Cheers Lloyd :-Z :s :s
Cletus's run was awesome... smoke coming out of the dyno's guts, I had visions of a headline like "Z Destroys Dyno!"
Chili, this dyno is a new installation... still being "run-in". Maybe this, and the operators' possible lack of familiarity with the equipment led to some false readings (eg, my autos' power-train loss was definately less than both Cletus' and Ty's. Like I said "Go figure!"). I heard a rumour that Simon (TTZ) is organising a dyno day in the not-too-distant future... maybe we'll be able to get some comparison runs in. Cheers, Doug
I wondered where that smoke was comin from : I looked over the blokes shoulder and my eyes popped . He gave me a knowing look and said it was the anti-rust treatment coming from the brakes on the roller. I knew of the ol TT smoke standard, but thought there was a bit much there 8D
