Throttle stop ratio question

dentmagnet · 02-10-2011, 12:01 PM

For all you .90 racin experts: 427 SBC in a nova runs 9.3 all out. Gonna do some S/G with an alky carb setup as follows: 54-5500 dead/down stall, shift .80 out, Tstop on @ .30 & off @ 2.5 to run close to 9.90 in 2-3000 ft DA. What kind of T/S timer ratio am I gonna end up with? was thinking around 5-6 to 1 with what testing I have done so far. Also any ideas on a good starting point for an air ratio? 60 ft repeats pretty good (about .010 swing all day) Thanks for any replies

wayne sipos · 02-10-2011, 06:52 PM

just curious...... why do you want to run the stop rpm so high?

dentmagnet · 02-10-2011, 07:08 PM

Well Wayne, a couple of reasons, first, I'm just a little over a half of a second under so I dont have much to begin with and second, I want to shift into Hi right away for consistency which kills about .25 so now I'm barely .25 under and I really dont want to come off the stop in Lo for obvious reasons. I also dont want to run less than 1 second total timer cause that doesnt work well at all so thats what it takes me to run 9.9 with about 2.2 timer., 54-5500 rpm.

wayne sipos · 02-11-2011, 09:39 AM

there is a good explanation on biondo racing products web site....tips on throttle stop racing in the faq section...hope this helps

dentmagnet · 02-11-2011, 03:43 PM

Thanks Wayne for that info, that helps alot. confirms what I was thinking anyway and heads me in the right direction. 5 to 1 with 4800

That must put me @ 7 to 1, 8 to 1??

02-10-2011, 12:01 PM	#1
dentmagnet Junior Member Join Date: Feb 2011 Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	Throttle stop ratio question For all you .90 racin experts: 427 SBC in a nova runs 9.3 all out. Gonna do some S/G with an alky carb setup as follows: 54-5500 dead/down stall, shift .80 out, Tstop on @ .30 & off @ 2.5 to run close to 9.90 in 2-3000 ft DA. What kind of T/S timer ratio am I gonna end up with? was thinking around 5-6 to 1 with what testing I have done so far. Also any ideas on a good starting point for an air ratio? 60 ft repeats pretty good (about .010 swing all day) Thanks for any replies Last edited by dentmagnet; 02-10-2011 at 12:40 PM.

02-10-2011, 06:52 PM	#2
wayne sipos Junior Member Join Date: Dec 2007 Location: ontario canada Posts: 39 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle stop ratio question just curious...... why do you want to run the stop rpm so high? __________________ Wayne Sipos HR 3959

02-10-2011, 07:08 PM	#3
dentmagnet Junior Member Join Date: Feb 2011 Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle stop ratio question Well Wayne, a couple of reasons, first, I'm just a little over a half of a second under so I dont have much to begin with and second, I want to shift into Hi right away for consistency which kills about .25 so now I'm barely .25 under and I really dont want to come off the stop in Lo for obvious reasons. I also dont want to run less than 1 second total timer cause that doesnt work well at all so thats what it takes me to run 9.9 with about 2.2 timer., 54-5500 rpm. Last edited by dentmagnet; 02-10-2011 at 08:52 PM.

02-11-2011, 09:39 AM	#4
wayne sipos Junior Member Join Date: Dec 2007 Location: ontario canada Posts: 39 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle stop ratio question there is a good explanation on biondo racing products web site....tips on throttle stop racing in the faq section...hope this helps __________________ Wayne Sipos HR 3959

02-11-2011, 03:43 PM	#5
dentmagnet Junior Member Join Date: Feb 2011 Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	Re: Throttle stop ratio question Thanks Wayne for that info, that helps alot. confirms what I was thinking anyway and heads me in the right direction. 5 to 1 with 4800 That must put me @ 7 to 1, 8 to 1??