|
|
Post by The Observer on Aug 11, 2009 8:44:02 GMT 12
I just hope macca takes a video camera so we can see the beast singing on the dyno. I love the sound those speedway motors make, and its the closest thing to a winter fix i will get. Well, that and the shed tour this weekend. Look foward to the video footage macca, and good luck for this weekend 02macgor.tripod.com/MACCA/macca.htmland a link back to when macgor discovered macca, and the subsequent interveiw. keep up the good work all  |
|
|
|
Post by Colin E on Aug 11, 2009 9:09:36 GMT 12
I don't know too much about them but the Superstock I crew for is always put on a Hub Dyno, Apparently it gives more accurate HP and Torque readings to enable the best setup to be acheived for the type of drive you want.
|
|
|
|
Post by macca on Aug 11, 2009 18:19:16 GMT 12
There will be video going on . Temps noted at all 8 pipes , bert , heads , diff ect. The runs will be taking place between 3ish and 7.30ish tomorrow . The tech will know when its happening thats for sure. There's quite a few people exspected from within the instatute and a number of speedway people also. See you there or we'll post some footage sometime after Kihikihi.
|
|
|
|
Post by macca on Aug 13, 2009 7:43:37 GMT 12
Ok , for anyone interested here's a quick rundown on D Day before I head off to work . Arrived at the Northtec at 2.30 and left at 8.15. Went through 55ltrs of fuel on the Dyna PAC machine.( NZ made ) There were major WARNING signs early on. Not from the car . The screen on the Dyno FLASHED WARNING WARNING ..... REDUCE TORQUE IMMEDIATLY...... ;D ROUND 1 TO THE RACE CAR.  Tech man Simon was on the phone to Wellington to see what was going on. ................. The suggestion was to change diff gears to get a 3 to 1 final drive ratio. We flopped the cogs around 6.71 became 3.52 and tried that. Over the next 2 1/2 hour we ran the car up 12 - 15 times trying different loading up methods . With the rear end being so tall and the way the load was coming on the best loaded test figure that was produced was 323kw at 5000 rpm . Certainly not to be sneezed at. The 40 plus different faces ( friends, students, tutors, MTA Officials , and Speedway people ) weren't about to sneeze anyway. Then it was pizza's and beverages for everyone and dismantle and load uptime and off home . Bloody awe sum. |
|
|
|
Post by The Observer on Aug 13, 2009 8:34:38 GMT 12
Awesome Macca - thanks for the update, and if possible down the track (excuse the pun) it would be great to see a video of the session.
Sounds like the torque will get the beast off the corners - what did it pull out of interest?
And the figures change from dyno to dyno i'm told, so it would be interesting to see what a "benchmark" figure a road vehicle would pull so we can see the big grunt the supersaloon motor is putting out.
Very impressive, and thanks for sharing! and of course good luck for this weekend
|
|
|
|
Post by nakifans on Aug 13, 2009 15:31:43 GMT 12
8-)In the old language what does 323 kw equate to in HP.Also with aprox 20pc loss thru drivetrain what would motor HP be and only running it at 5000rpm is their still untapped kw/hp in the remaining 2500 plus rpms used on the track.Good report,looking forward to Sundays results if the weather gods play their part and hope the video can provide a bit of off season ear piercing excitement.Best for the season Macca  ;D |
|
|
|
Post by Roger Ex 35A on Aug 13, 2009 15:54:12 GMT 12
8-)In the old language what does 323 kw equate to in HP.Also with aprox 20pc loss thru drivetrain what would motor HP be and only running it at 5000rpm is their still untapped kw/hp in the remaining 2500 plus rpms used on the track.Good report,looking forward to Sundays results if the weather gods play their part and hope the video can provide a bit of off season ear piercing excitement.Best for the season Macca ;D 1 KW = 1.3410 HP so 323 Kw = 433 HP. I think that is at the wheels is it not 
|
|
|
|
Post by macca on Aug 13, 2009 19:25:30 GMT 12
8-)In the old language what does 323 kw equate to in HP.Also with aprox 20pc loss thru drivetrain what would motor HP be and only running it at 5000rpm is their still untapped kw/hp in the remaining 2500 plus rpms used on the track.Good report,looking forward to Sundays results if the weather gods play their part and hope the video can provide a bit of off season ear piercing excitement.Best for the season Macca ;D 1 KW = 1.3410 HP so 323 Kw = 433 HP. I think that is at the wheels is it not Close Roger. We did a few very similar runs. The best was this. The print out sheet says 435.6 hp @ 5000rpm and in the same run 2198Nm @4141 rpm. Don't forget we were asked to re gear the car to 3.52 as when geared @ 6.71 over 3000Nm of torque was generated as the Dynapack machine shut down . There was a cheer from the onlookers at that time. ;D |
|
|
|
Post by Roger Ex 35A on Aug 13, 2009 19:56:23 GMT 12
[Close Roger. We did a few very similar runs. The best was this. The print out sheet says 435.6 hp @ 5000rpm and in the same run 2198Nm @4141 rpm]. All good Shane lets hope the Weather Gods are kind to us on Sunday  |
|
|
|
Post by nakifans on Aug 13, 2009 20:36:47 GMT 12
::)To put the torque figures in some comparisons Macca 2193nm @3.52 Gearing In race trim Gearing @6.71 3,000 plus nm"shut dyno down"  Big Rigs on NZ roads Iveco Powerstar 418kw 2495nm Fuso Shogun 382kw 2160nm Kenworth T 408SAR 360kw 2508nm Stone Bros BA 635BHP/474KW 455 FT LBS/615NM As seen the torque on the race car which is the power band is comparable or better to the big rigs,hence the rocket ship acceleration of these beasts,power to weight ratio. |
|
|
|
Post by The Observer on Aug 13, 2009 21:01:29 GMT 12
Hi Macca and team - again, thanks for the information. question i have - how can changing the gearing effect the amount of torque the motor is putting out  ? And how can i change the gearing in my stockcar to get those mountains of torque ;D thanks in advance for any advice - this is turning into a tech board discussion ;D |
|
|
|
Post by macca on Aug 14, 2009 7:37:28 GMT 12
Hi The Observer, Heres my way to answer your question: Get yourself a 2 speed electric drill, try to slow it down at the chuck with your hand in both low gear and then again in hi gear. Once you have been released from hospital and made a full recovery, try doing it again but this time use a cordless 2 speed drill. I think it will be easy to feel the difference. I was afraid this would end up heading to the Tech board also. Cheers Macca |
|
|
|
Post by The Observer on Aug 14, 2009 8:40:26 GMT 12
hmmmm I'm a bit confused - are you saying you used two different saloon cars ie two differnent drills? Wheres that scratching head smiley. Can;t be that, so, changing gearing might spread the load accross a longer ratio? Very confused...  I can;t see how spreading the load over a longer "band" should impact on the total torque the motor is putting out. I should offer a caveat here - I'm a simple man, as you can allready tell by my response thanks in advance for any clarity team! |
|
|
|
Post by ross56y on Aug 14, 2009 12:07:59 GMT 12
ok go for drive in your road car at 50khs
if its mannul place in 5th gear and boot it . car will slowly pull . now do it in 3gear you will see a big difference
this is lay mans way of explaning of how torgue works
thats gearing .
|
|
|
|
Post by macca on Aug 14, 2009 12:27:54 GMT 12
In addition to the over geared issue , there was another issue . It was the bert gear box. Once again we were trying to override this.........................
The problem was changing from the crawler gear ( 1st ) To the direct drive race gear (2nd ) .
the Dyna-pack was commencing its loading before I was even in race gear. .........
So the engine was loaded at less the 2000rpm and trying to climb to 7000 rpm loaded. Far from a natural track situation.
Another way to look at it is trying to go from 30mph to 280 mph up a step hill in one gear. I think a gear set around 5.0 / 1 would be the answer.
|
|
|
|
Post by schumaaka on Aug 15, 2009 10:25:48 GMT 12
That info is awesome.
Ray Stewarts car has been on a rolling road dyno and a engine only fixed dyno. My engine was developed on Ross Calghers Dyno in taranaki.
The benefit is that you get to do the development work in a controlled enviroment. Track development is a waste of time as the conditions track, Driver, surface Grip Temperature are forever changing.
Once developed my engine only went back on the dyno when we did upgrades and we could compare it to the previous figures for torque and HP.
How you operate the Dyno can also affect the figure that you produce as well. I have seen the same engine grow 100hp from 1 dyno to another with no changes done to the engine.
We use the same Dyno, Same operator everytime.
Once the engine arrives from the dyno I bolt it in and it's ready to race from the first corner and means that I can forget about the engine for the entire season, Push the button and put you foot flat knowing that you have reliable HP and torque every time.
Then all you I have to do is sort the setup and the driver which is enought to worry about.
Hope thats of some interest, Look forward to watching Macca on the track he is going be awesome.
|
|
;D
?
I can;t see how spreading the load over a longer "band" should impact on the total torque the motor is putting out.
