rpms past peak

PROTREE · 09-05-2011, 06:29 PM

how many rpms do you guys go past peak hp across the stripe.

randy wilson · 09-06-2011, 09:13 AM

Four to six hundred

Charlie Yannetti · 09-08-2011, 08:47 PM

Around 200 below.. you want the motor to be pulling going out the back door, not nosing over cause you ran it out of the power band..

Check your dyno sheet.. it will show you where your motor starts to lose power.. that's where you DON'T want to be on shift points or at the finish line..

randy wilson · 09-09-2011, 08:52 AM

To each his own, I say.

69Cobra · 09-13-2011, 08:04 AM

I agree with the 4 to 6 hundred over.

09-19-2011, 08:44 AM

Through my experience, my best ET's are when it is just noseing over. It does hurt speed however.

mike natoli · 09-23-2011, 09:49 AM

This is what testing is for. All data available should be used dyno sheets are helpful, actual full pass data logger recorder, weather, track conditions and time slips is best. Once you feel or hear the car nose over you have peaked, and momentum will carry you a bit further and than that’s it. At that point the mass is just maintaining speed no more acceleration. We are striving for best ET not mph. As far as gear change torque should be at least equal to or higher from when ratio to the next that’s were a dyno sheet helps and gear ratio calculator helps for maximizing acceleration time. Have fun and if something breaks time to go back to the drawing boards.

Charlie Yannetti · 09-28-2011, 08:20 PM

LOL.. you guys are killing me.. you must be getting free valve springs too.. OR you just aren't checking them.. OR you don't run a Comp Eliminator car, which means you're in the wrong section.. OR your engine builder loves you.. choose your pick.. LMAO!!

randy wilson · 09-29-2011, 09:43 AM

Beings Charlie runs comp, he probably does know more then most. That being said, I gear my car where it runs the quickest E T. It happens to be past peak, don't know why, don't care. It is what it is. Also, our springs stay good for about 15 runs. Don't know if that's normal or not. And, I have, and still use springs with 425 seat, and 1050 open pressure. But, have never ran any quicker with those rates and monster pushrods, then we did with 275 seat and 700 open. Go figure.

Charlie Yannetti · 09-29-2011, 06:42 PM

Probably cause you're nosing over, Randy.. on the Comp cars that I've driven and worked on, we run about 485 to 500 on the seat and get close to 40 runs out of them.. recently that's been on screaming small blocks and 6 cylinder stuff.. shifting at around 9600 to 9800 and going out the back at 10,200 to 10,400 depending on the weather.. everything came off the dyno being run to 10,400 to 10,600.. but that's how Rick Watter's stuff works..

My SG car has about 290 on the seat and never runs more than 7300, on or off the stop.. it's all new now, but the last motor was 4 seasons old and I never changed a spring in those four years.. they were all still at 280 to 285 when we took them off..

09-05-2011, 06:29 PM	#1
PROTREE Junior Member Join Date: Sep 2008 Posts: 1 Likes: 0 Liked 0 Times in 0 Posts	rpms past peak how many rpms do you guys go past peak hp across the stripe.

09-06-2011, 09:13 AM	#2
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 22 Times in 22 Posts	Re: rpms past peak Four to six hundred __________________ don,t have one

09-08-2011, 08:47 PM	#3
Charlie Yannetti Senior Member Join Date: Jan 2005 Location: Alpine, NJ Posts: 564 Likes: 184 Liked 185 Times in 81 Posts	Re: rpms past peak Around 200 below.. you want the motor to be pulling going out the back door, not nosing over cause you ran it out of the power band.. Check your dyno sheet.. it will show you where your motor starts to lose power.. that's where you DON'T want to be on shift points or at the finish line..

09-09-2011, 08:52 AM	#4
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 22 Times in 22 Posts	Re: rpms past peak To each his own, I say. __________________ don,t have one

09-13-2011, 08:04 AM	#5
69Cobra Senior Member Join Date: Aug 2007 Location: California, Ky Posts: 667 Likes: 33 Liked 1 Time in 1 Post	Re: rpms past peak I agree with the 4 to 6 hundred over. __________________ Kris Rachford 69 Cobra 428CJ 4 Speed C/S 3032

09-19-2011, 08:44 AM	#6
Tilley2007 Guest Posts: n/a	Re: rpms past peak Through my experience, my best ET's are when it is just noseing over. It does hurt speed however.

09-23-2011, 09:49 AM	#7
mike natoli Member Join Date: Mar 2007 Location: Valley Stream mini Gasoline Alley & Div I Posts: 100 Likes: 25 Liked 52 Times in 16 Posts	Re: rpms past peak This is what testing is for. All data available should be used dyno sheets are helpful, actual full pass data logger recorder, weather, track conditions and time slips is best. Once you feel or hear the car nose over you have peaked, and momentum will carry you a bit further and than that’s it. At that point the mass is just maintaining speed no more acceleration. We are striving for best ET not mph. As far as gear change torque should be at least equal to or higher from when ratio to the next that’s were a dyno sheet helps and gear ratio calculator helps for maximizing acceleration time. Have fun and if something breaks time to go back to the drawing boards.

09-28-2011, 08:20 PM	#8
Charlie Yannetti Senior Member Join Date: Jan 2005 Location: Alpine, NJ Posts: 564 Likes: 184 Liked 185 Times in 81 Posts	Re: rpms past peak LOL.. you guys are killing me.. you must be getting free valve springs too.. OR you just aren't checking them.. OR you don't run a Comp Eliminator car, which means you're in the wrong section.. OR your engine builder loves you.. choose your pick.. LMAO!!

09-29-2011, 09:43 AM	#9
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 22 Times in 22 Posts	Re: rpms past peak Beings Charlie runs comp, he probably does know more then most. That being said, I gear my car where it runs the quickest E T. It happens to be past peak, don't know why, don't care. It is what it is. Also, our springs stay good for about 15 runs. Don't know if that's normal or not. And, I have, and still use springs with 425 seat, and 1050 open pressure. But, have never ran any quicker with those rates and monster pushrods, then we did with 275 seat and 700 open. Go figure. __________________ don,t have one

09-29-2011, 06:42 PM	#10
Charlie Yannetti Senior Member Join Date: Jan 2005 Location: Alpine, NJ Posts: 564 Likes: 184 Liked 185 Times in 81 Posts	Re: rpms past peak Probably cause you're nosing over, Randy.. on the Comp cars that I've driven and worked on, we run about 485 to 500 on the seat and get close to 40 runs out of them.. recently that's been on screaming small blocks and 6 cylinder stuff.. shifting at around 9600 to 9800 and going out the back at 10,200 to 10,400 depending on the weather.. everything came off the dyno being run to 10,400 to 10,600.. but that's how Rick Watter's stuff works.. My SG car has about 290 on the seat and never runs more than 7300, on or off the stop.. it's all new now, but the last motor was 4 seasons old and I never changed a spring in those four years.. they were all still at 280 to 285 when we took them off..