Engine Dyno testing of Renesis
05-25-2006, 06:55 PM
#76
N/A Tests complete
Yesterday we conducted our series of N/A tests on the Renesis. This is a standard, unopened 6-port motor with std fuel injectors, intake runners and throttle body.
We did tests with the stock exhaust manifold and cat, and with a set of Phil Laird custom extractors, basically as per what is fitted to Wildcard's car.
Here are some various pics of the setup just before startup...
Overview showing inside dyno room:
Other side, showing coupling to retarder etc.:
Load cell:
View from control room:
Another view inside control room showing dyno control panel, and MoTeC ECU Manager running on the laptop:
5MB Video here:
RX-8 Renesis engine running on Engine Dyno
The video is with the extractors on (obviously!). This is actually 3 clips, merged into one. The power pull (middle bit) was not really straight after it was started - i.e. it had a chance to get to operating temps first, and to cool down before it was shut off. I just clipped the boring bits out. Yes, there is a bit of a water leak at the front that doesn't affect things. I think that might be dripping down the hose from the water tank.
You can see the cable operating the throttle, under automatic control from the dyno software. At the start of the run, you can see it back off to idle, then open up to full throttle - the retarded then kicks in and holds the engine at 4000 RPM for about 3 seconds, then ramps up to 8500 RPM at a pre-determined rate, all the while measuring the load. Pretty trick. We could program in a automated drive cycle like on that F1 video I showed once before. Would LOVE to do that!
When the engine first starts, the noise is nice and crisp, but by the time the power pull is run, the exhaust fans in the cell have started up, so there is an annoying background noise. BTW - The camera is on a tripod inside the dyno room. You can here the exhaust fan noise after the engine is shut down.
Hope you enjoyed that, expecially the red-hot header pipe.
The results...
Hmm. This engine, after tuning for maximum power, puts out significantly less than the 238HP as published by the manufacturer. The results of the dyno are corrected for atmospheric conditions. Were not going to publish the actual figure - it will cause too many arguements.
The best bit - Phils Laird's "Hymee Enhanced" extractors are worth a genuine 14 HP and 7 ft-lbs. The gains were made right accross the board. The total HP gain was more than 6% over the baseline. (a hint for those numerically minded
)
One other thing to note - this configuration suffers thought the mid-range a little bit, as we had all the ports "hard wired" in the open position. Since it will be eventually blown, then this is not of concern to us now, and doesn't affect the top end results anyway. The important bit is the power (hence torque) was up on standard all the way through the test.
Cheers,
Hymee.
We did tests with the stock exhaust manifold and cat, and with a set of Phil Laird custom extractors, basically as per what is fitted to Wildcard's car.
Here are some various pics of the setup just before startup...
Overview showing inside dyno room:
Other side, showing coupling to retarder etc.:
Load cell:
View from control room:
Another view inside control room showing dyno control panel, and MoTeC ECU Manager running on the laptop:
5MB Video here:
RX-8 Renesis engine running on Engine Dyno
The video is with the extractors on (obviously!). This is actually 3 clips, merged into one. The power pull (middle bit) was not really straight after it was started - i.e. it had a chance to get to operating temps first, and to cool down before it was shut off. I just clipped the boring bits out. Yes, there is a bit of a water leak at the front that doesn't affect things. I think that might be dripping down the hose from the water tank.
You can see the cable operating the throttle, under automatic control from the dyno software. At the start of the run, you can see it back off to idle, then open up to full throttle - the retarded then kicks in and holds the engine at 4000 RPM for about 3 seconds, then ramps up to 8500 RPM at a pre-determined rate, all the while measuring the load. Pretty trick. We could program in a automated drive cycle like on that F1 video I showed once before. Would LOVE to do that!
When the engine first starts, the noise is nice and crisp, but by the time the power pull is run, the exhaust fans in the cell have started up, so there is an annoying background noise. BTW - The camera is on a tripod inside the dyno room. You can here the exhaust fan noise after the engine is shut down.
Hope you enjoyed that, expecially the red-hot header pipe.
The results...
Hmm. This engine, after tuning for maximum power, puts out significantly less than the 238HP as published by the manufacturer. The results of the dyno are corrected for atmospheric conditions. Were not going to publish the actual figure - it will cause too many arguements.
The best bit - Phils Laird's "Hymee Enhanced" extractors are worth a genuine 14 HP and 7 ft-lbs. The gains were made right accross the board. The total HP gain was more than 6% over the baseline. (a hint for those numerically minded
)One other thing to note - this configuration suffers thought the mid-range a little bit, as we had all the ports "hard wired" in the open position. Since it will be eventually blown, then this is not of concern to us now, and doesn't affect the top end results anyway. The important bit is the power (hence torque) was up on standard all the way through the test.
Cheers,
Hymee.
Last edited by Hymee; 05-25-2006 at 07:06 PM.
05-25-2006, 07:05 PM
#80
Originally Posted by MazdaManiac
Where is the MAF and what did you use as an intake?
Cheers,
Hymee.
05-25-2006, 07:15 PM
#84
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Your extractors are getting a bit hot I see. As for the HP observed. Based on the clues it fits with the advertised amount. At least the amount advertised for the 06.
EDIT: Which is still makes it the most powerful 13B to date.
EDIT: Which is still makes it the most powerful 13B to date.
05-25-2006, 07:16 PM
#85
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Last edited by Renesis_8; 09-11-2011 at 08:45 AM.
05-25-2006, 07:19 PM
#86
Originally Posted by zoom44
extractors= headers.
was the torque equal to or close to the published number?
was the torque equal to or close to the published number?
The peak power was less than advertised, hence the torque at that point was less. I'd have to go get the print out again (not with me at the moment) to give a decisive answer comparing max torque with that advertised.
Cheers,
Hymee.
05-25-2006, 07:23 PM
#88
Originally Posted by Rx-A-Ho
Your extractors are getting a bit hot I see. As for the HP observed. Based on the clues it fits with the advertised amount. At least the amount advertised for the 06.
EDIT: Which is still makes it the most powerful 13B to date.
EDIT: Which is still makes it the most powerful 13B to date.
Nope - they are correct.
Cheers,
Hymee.
05-25-2006, 07:26 PM
#89
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wow, middle tube on the extractor (header for all us yanks) gets significantly hotter than the outside ones.
if i did my numbers correctly, it looks like the approximate drive train losses of 40 horsepower looks to be pretty accurate.
thanks for all the hard work hymee.
if i did my numbers correctly, it looks like the approximate drive train losses of 40 horsepower looks to be pretty accurate.
thanks for all the hard work hymee.
05-25-2006, 07:26 PM
#90
Originally Posted by Renesis_8
Is the 6% HP gain the area under the curve?? or its peak power
It is the peak power. However, those headers show a similar gain all the way through the dyno graph.
Cheers,
Hymee.
05-25-2006, 07:30 PM
#92
Originally Posted by lurch519
wow, middle tube on the extractor (header for all us yanks) gets significantly hotter than the outside ones.
if i did my numbers correctly, it looks like the approximate drive train losses of 40 horsepower looks to be pretty accurate.
thanks for all the hard work hymee.
if i did my numbers correctly, it looks like the approximate drive train losses of 40 horsepower looks to be pretty accurate.
thanks for all the hard work hymee.
I'm not worring about drive train losses just yet. I'm looking at what she makes at the flywheel. When we finish our development on the engine dyno and install it in a car, we can go back on the rollers and make that comparison using like equipment (i.e. using DynoLog chassis dyno).
No one has shown me they worked out the maths properly, yet
Cheers,
Hymee.
05-25-2006, 07:31 PM
#93
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Go check Mazda the currently advertised HP for the 6 speed is 232 HP ... they changed it from last year (05). So with the clues it works for the current rating.
Click on the specs tab.
http://www.mazdausa.com/MusaWeb/disp...ehicleCode=RX8
Click on the specs tab.
http://www.mazdausa.com/MusaWeb/disp...ehicleCode=RX8
05-25-2006, 07:37 PM
#94
Originally Posted by olddragger
probably 220 hp. In the ballpark of what I have always felt like it was. That also would explain the low dyno results at the wheels.
olddraggerl
olddraggerl
Cheers,
Hymee.
Last edited by Hymee; 05-25-2006 at 07:41 PM.
05-25-2006, 07:39 PM
#95
Originally Posted by Rx-A-Ho
Go check Mazda the currently advertised HP for the 6 speed is 232 HP ... they changed it from last year (05). So with the clues it works for the current rating.
Click on the specs tab.
http://www.mazdausa.com/MusaWeb/disp...ehicleCode=RX8
Click on the specs tab.
http://www.mazdausa.com/MusaWeb/disp...ehicleCode=RX8
Cheers,
Hymee.
05-25-2006, 07:40 PM
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Last edited by Renesis_8; 09-11-2011 at 08:45 AM.
05-25-2006, 07:45 PM
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Last edited by Renesis_8; 09-11-2011 at 08:45 AM.