Subject	A brake dyno directly determines torque, and calculates
Posted by	Ash's Z on November 22, 2004 at 11:09 AM
	This message has been viewed 85 times.
In Reply To	Isn't Rwhp calculated from Torque X RPM/5252??----> posted by Kyle(Houston) on November 22, 2004 at 09:45 AM
Message	horsepower. It does this through induction braking and the amount of current it takes to 'hold' the engine at a given RPM is proportional to the torque it is producing. It has no means of directly determining horsepower as that calculation requires work to be done, which would require some change in speed. An intertial dyno directly determines horsepower, and calculates torque. This is because it can only measure the change of drum speed over time and the resistive load, which is analogous to how the brake dyno works, is in the mass of the drum itself. It requires force to turn the drum, but only the value of work can be determined with an intertial setup. Fortunately we have the math to allow us to interchange between the two so in either case we can get both figures. [ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
Follow Ups	New best 1/4 mile time for me and a recent dyno tune - aZiator 07:27:59 11/22/04 at least you're in the 11's - snack_machine 07:39:18 11/22/04 ROFL at the last pic. >> - Arnel@Z32racing.com 08:09:07 11/22/04 Please don't cut the x-axis on dyno charts - Technomancer 08:17:03 11/22/04 Sorry, I dont have a scanner. Best I could do taking - aZiator 09:15:57 11/22/04 You could have them send you the dyno files - EricTTZ 10:18:19 11/22/04 When you talk about the plug porcelain, what do you mean - RSR 08:52:24 11/22/04 Look at the pic of the plug, whatever that part is around - aZiator 09:15:07 11/22/04 I looked at the picture, but can't tell much. - RSR 10:01:06 11/22/04 Ryan, look where I circled - boileralum 10:09:59 11/22/04 Thanks. It looks like....... - RSR 11:35:05 11/22/04 It is a good point. I had a chance to look at the pictures - Ash's Z 10:52:24 11/22/04 Actually----> - Kyle(Houston) 09:07:32 11/22/04 I forgot you even said that, I was actually talking about - aZiator 09:11:11 11/22/04 You did loose 60 Ft/lbs of torque & A/F is not as smooth.... (n/m) - Kyle(Houston) 09:21:59 11/22/04 Z1's dyno. I can swear it always read lower than the 248X - Ash's Z 09:32:17 11/22/04 Isn't Rwhp calculated from Torque X RPM/5252??----> - Kyle(Houston) 09:45:24 11/22/04 No, other way around. A dyno only determines horsepower - Ash's Z 10:38:54 11/22/04 That is the problem with Inertia dynos's----> - Kyle(Houston) 11:28:45 11/22/04 No kidding... - Dallas DamonZ 21:20:37 11/22/04 A brake dyno directly determines torque, and calculates - Ash's Z 11:09:26 11/22/04 3rd, A/F should have been worked on before going for a # - nixit 10:28:06 11/22/04 It happened the other way around though. We hit the number - Ash's Z 10:43:15 11/22/04 he ran out of fuel with 740's due to the fuel pump? - genic 10:49:26 11/22/04 A good fuel pump, probably so. But I think there are fuel - Ash's Z 10:54:05 11/22/04 im not worried about the rwhp numbers...just the - genic 10:55:58 11/22/04 I really think there is an issue with his fuel pump or some - Ash's Z 11:17:15 11/22/04 So what d oyou recomend? - EricTTZ 11:37:44 11/22/04 I'm researching that myself actually. I dont really have - Ash's Z 11:43:22 11/22/04 did you get your motor running yet? (n/m) - aliaZ 11:58:02 11/22/04 SPLParts seems to advocate overdriving the fuel pump - Technomancer 12:24:39 11/22/04 Overdriving an already weak pump won't help much though (n/m) - boileralum 12:35:26 11/22/04 Wasn't trying to apply this solution to that particular case - Technomancer 13:06:59 11/22/04 Dunno - I'm bored so I'm just trying to make conversation ;) (n/m) - boileralum 13:19:00 11/22/04 you jerks make my screen have a horizontal scrollbar now ;) (n/m) - joel(PA) 16:08:10 11/22/04 smaller fonts and higher resolution owns you :) (n/m) - Jjzx (next-gear.com) 17:34:07 11/22/04 Re: New best 1/4 mile time for me and a recent dyno tune - DrDCanaceu 09:27:45 11/22/04 LOL...Sigo esperando los 10s. :P - TheTwinZ (Peru) 12:29:28 11/22/04 Congrats on the time sir. (n/m) - Milo (Sport Z Magazine) 09:34:42 11/22/04 So which is funner, the Chinook or the Z? - Ash's Z 09:41:09 11/22/04 What plugs are you using? That looks like platinum - AzHeat 10:05:40 11/22/04 Curious: what is the relationship between the removal - RSR 10:08:56 11/22/04 shorter plug , the boss would not expose the spark as well - AzHeat 10:16:39 11/22/04 Copper Iridiums do work well w heat range of #7 >600rwhp - jawz 10:26:33 11/22/04 Copper Iridiums? :confused: (n/m) - boileralum 10:33:29 11/22/04 I think he mean copper or iridiums not both . (n/m) - AzHeat 10:34:30 11/22/04 removing the spark plug boss allows the use of shorter plugs (n/m) - aliaZ 10:51:58 11/22/04 in light of recent post/replies, i'd recommend that you - ni[X]it 13:42:10 11/22/04 Agreed 100%. I think I have determined his problem >>> - Ash's Z 17:01:19 11/22/04 Would my fuel pressure gauge show a drop in pressure if the - aZiator 17:30:55 11/22/04 Is this documented somewhere that the ecu disengages the - AzHeat 17:36:03 11/22/04
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