CLASS RACER FORUM - View Single Post - Data Recorder Shows 300 rpm 'droop' After Car Launches???

FED 387 · 06-14-2012, 11:16 AM

listen to Keowen if its who I am thinking it is he has built some fast stuff--Comp cars will/might/could have either a tiny flat line or a VERY small droop when the car first leaves the line usually its a rapid upward spike or you hope it is---- A Comp engine regardless of size is making at least 2.6 HP per CU IN and then the really good ones make all the way up to almost 3 HP per CU IN.possibly more!!! The starting line RPM 's ,( gearing , car weight etc.factored in) that they are leaving at too are such that the phenomonen(RPM drop) you are seeing is so small or does not even exist.
I think it would be unwise to try to compare a Super Stock engine such as yours with the graphs from a Comp engine based solely on the tremendous performance differential here... My suggestion would be to find and talk to a similiarly classed car owner/driver for their perspective on this... Also if you have a data recorder you should be talking to the manufacturer for his input on what you are seeing. They are constantly talking to racers so they might be able to figure out a bit what it is you need too. FED387

06-14-2012, 11:16 AM	#8
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,417 Likes: 522 Liked 331 Times in 179 Posts	Re: Data Recorder Shows 300 rpm 'droop' After Car Launches?? listen to Keowen if its who I am thinking it is he has built some fast stuff--Comp cars will/might/could have either a tiny flat line or a VERY small droop when the car first leaves the line usually its a rapid upward spike or you hope it is---- A Comp engine regardless of size is making at least 2.6 HP per CU IN and then the really good ones make all the way up to almost 3 HP per CU IN.possibly more!!! The starting line RPM 's ,( gearing , car weight etc.factored in) that they are leaving at too are such that the phenomonen(RPM drop) you are seeing is so small or does not even exist. I think it would be unwise to try to compare a Super Stock engine such as yours with the graphs from a Comp engine based solely on the tremendous performance differential here... My suggestion would be to find and talk to a similiarly classed car owner/driver for their perspective on this... Also if you have a data recorder you should be talking to the manufacturer for his input on what you are seeing. They are constantly talking to racers so they might be able to figure out a bit what it is you need too. FED387