Dyno results from “Bonneville” motor, 765 WHP, 900 CHP
03-03-2011, 05:47 PM
#31
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Hacker - yeah, I miss how at a Dynojet Dyno I could get the run file and run the Dynojet viewer software at home. I only get these printouts from these guys. Do Mustang Dynos have a runviewer software that I should get?
03-03-2011, 06:08 PM
#33
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September! How are you going to wait that long, or get any sleep as you lie in bed visualizing taking that beast to it's limit's.
What speed are you trying to hit?
Stephen
What speed are you trying to hit?
Stephen
03-03-2011, 06:52 PM
#34
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load it up, as in keeping the power constant? for tuning, all you would have to do would be to ride the brakes in 5th gear to simulate that. it takes very little brake pressure and heat to keep acceleration to 0 for a min or so. do that for a minute, there you go, mission done!
Hp curve looks awesome. looks pretty flat up top and will probaby fall at 6500rpm and onward. might want to get some taller gears or taller tires to hit the peak HP and top target speed.
Hp curve looks awesome. looks pretty flat up top and will probaby fall at 6500rpm and onward. might want to get some taller gears or taller tires to hit the peak HP and top target speed.
(in a straight line
03-03-2011, 07:37 PM
#36
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That's awesome! Nice to see a 928 engine in the 1000 horsepower range...
So here is my question, regarding the car:
Have you done any testing on the downforce and drag generated by that wing?
The reason I ask, is that from reading about top speed runs, things like wings and
spoilers actually slow you down. Obviously you want stability, so you need some
downforce. But wouldn't a stock 928s Euro spoiler work just as well? Maybe
a small front splitter? Seems like more of a wing for rally racing...
So here is my question, regarding the car:
Have you done any testing on the downforce and drag generated by that wing?
The reason I ask, is that from reading about top speed runs, things like wings and
spoilers actually slow you down. Obviously you want stability, so you need some
downforce. But wouldn't a stock 928s Euro spoiler work just as well? Maybe
a small front splitter? Seems like more of a wing for rally racing...
03-03-2011, 08:09 PM
#37
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no, do a full power run for a minute, I do not think the tires are going to hold on a dyno.
It was in reference to the oiling issue, that is one of the reasons engine builders use engine dyno's instead of chassis dynos.
It was in reference to the oiling issue, that is one of the reasons engine builders use engine dyno's instead of chassis dynos.
load it up, as in keeping the power constant? for tuning, all you would have to do would be to ride the brakes in 5th gear to simulate that. it takes very little brake pressure and heat to keep acceleration to 0 for a min or so. do that for a minute, there you go, mission done!
Hp curve looks awesome. looks pretty flat up top and will probaby fall at 6500rpm and onward. might want to get some taller gears or taller tires to hit the peak HP and top target speed.
Hp curve looks awesome. looks pretty flat up top and will probaby fall at 6500rpm and onward. might want to get some taller gears or taller tires to hit the peak HP and top target speed.
03-03-2011, 08:41 PM
#38
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load it up, as in keeping the power constant? for tuning, all you would have to do would be to ride the brakes in 5th gear to simulate that. it takes very little brake pressure and heat to keep acceleration to 0 for a min or so. do that for a minute, there you go, mission done!........
03-03-2011, 09:04 PM
#40
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http://www.newscientist.com/article/...te-change.html
03-03-2011, 09:42 PM
#41
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load it up, as in keeping the power constant? for tuning, all you would have to do would be to ride the brakes in 5th gear to simulate that. it takes very little brake pressure and heat to keep acceleration to 0 for a min or so. do that for a minute, there you go, mission done!
Hp curve looks awesome. looks pretty flat up top and will probaby fall at 6500rpm and onward. might want to get some taller gears or taller tires to hit the peak HP and top target speed.
Hp curve looks awesome. looks pretty flat up top and will probaby fall at 6500rpm and onward. might want to get some taller gears or taller tires to hit the peak HP and top target speed.
Fizzixs (Fig Newton's Third Law of Thermal Reciprocity...) tells me that the brakes still need to dissipate 800+ horsepower, regardless of what gear the trans might be in. That torque/gear ratio/horsepower discussion works both ways. Hint: There's a reason why the eddy-current and water-brake dyno's are popular-- there's a way to pipe the generated heat away to a much larger sink. Sinks much bigger that the rear brake rotors with no airflow on them, for sure.
03-04-2011, 02:57 AM
#42
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Nice to see it running.
I would have guessed that the crankcase life, at this level of output, would be minutes....it will be fun to follow this adventure. There's a group of us, here, that have been talking about coming up and watching this. Are those dates solid?
Seems like you are using close to a 20% correction factor for a manual transmission, which is the highest I've seen anybody ever use....which is why I thought you might be using an automatic transmission. Is this because of the Mustang Dyno?
I would have guessed that the crankcase life, at this level of output, would be minutes....it will be fun to follow this adventure. There's a group of us, here, that have been talking about coming up and watching this. Are those dates solid?
Seems like you are using close to a 20% correction factor for a manual transmission, which is the highest I've seen anybody ever use....which is why I thought you might be using an automatic transmission. Is this because of the Mustang Dyno?
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Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
03-04-2011, 05:09 AM
#43
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Fizzixs (Fig Newton's Third Law of Thermal Reciprocity...) tells me that the brakes still need to dissipate 800+ horsepower, regardless of what gear the trans might be in. That torque/gear ratio/horsepower discussion works both ways. Hint: There's a reason why the eddy-current and water-brake dyno's are popular-- there's a way to pipe the generated heat away to a much larger sink. Sinks much bigger that the rear brake rotors with no airflow on them, for sure.
03-04-2011, 05:49 AM
#44
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03-04-2011, 11:58 AM
#45
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I would have guessed that the crankcase life, at this level of output, would be minutes....it will be fun to follow this adventure. There's a group of us, here, that have been talking about coming up and watching this. Are those dates solid?
Seems like you are using close to a 20% correction factor for a manual transmission, which is the highest I've seen anybody ever use....which is why I thought you might be using an automatic transmission. Is this because of the Mustang Dyno?
Seems like you are using close to a 20% correction factor for a manual transmission, which is the highest I've seen anybody ever use....which is why I thought you might be using an automatic transmission. Is this because of the Mustang Dyno?
765 (wheel) divided by .85 = 900 (crank)
If you want to add another 5% for "Mustang/Eddy Current dyno correction factor to Inertial dyno" go right ahead. I didn't.
I am also concerned about pounding the crank thru the bottom of the motor... we have plans for adding steel caps tho the bearing journals, but that has not been done.
So frankly, nobody knows (including us) how many pulls we will get on this block before the casting gernades. It may be minutes, you may be right.
At Bonneville, we should be at WOT at redline (7000 rpm) for about 1 minute.
That will be absolutely brutal. We are able to simulate about a 20 second full-load pull on the Mustang dyno, but thats all. (Fun Fact: with our large Land Speed Tires, 7000 rpm in 4th gear gave us 198 MPH (No aerodynamic drag of course - just a fun observation))
Right now my focus is on developing a crankcase breather system that will keep us in oil for that long minute.... everything we have right now for road racing is inadequate and I dont want to pump all the oil out of the motor midway during the run!