Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666254
06/15/19 05:53 PM
06/15/19 05:53 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Interesting. I ain't a drag racer but I am assuming ET is the bottom line. Here's a BTT for ya.
live every 24 hour block of time like it's your last day on earth
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Re: Lowered my timing by 3 degrees
[Re: AndyF]
#2666269
06/15/19 06:33 PM
06/15/19 06:33 PM
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Joined: Dec 2012
Posts: 1,824 Wind Gap,Pa.
Sammy
OP
top fuel
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OP
top fuel
Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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That is a big change. Not sure what your ET is but if the car is very fast at all then that is a bunch of horsepower that you picked up. 8.67@154 with 35 degrees timing 8.70@157 with 32 degrees 60 foot is a little off @32 degrees. 1.23 60 foot is 1.18 @ 35 degrees
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666271
06/15/19 06:38 PM
06/15/19 06:38 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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That is a big change. Not sure what your ET is but if the car is very fast at all then that is a bunch of horsepower that you picked up. 8.70@154 with 35 degrees timing 8.67@157 with 32 degrees 60 foot is a little off @32 degrees. 1.23 60 foot is 1.18 @ 35 degrees So it wants timing to get the car moving and retard after. Get a high speed retard. You can probably add another 2-3 degrees at the hit and then pull the timing back out .
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666278
06/15/19 07:15 PM
06/15/19 07:15 PM
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Joined: Feb 2005
Posts: 20,186 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,186
PA.
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That is a big change. Not sure what your ET is but if the car is very fast at all then that is a bunch of horsepower that you picked up. 8.67@154 with 35 degrees timing 8.70@157 with 32 degrees 60 foot is a little off @32 degrees. 1.23 60 foot is 1.18 @ 35 degrees .03 not .30. And where is the 1.5 tenths in the first post
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666279
06/15/19 07:15 PM
06/15/19 07:15 PM
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Joined: Feb 2005
Posts: 20,186 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,186
PA.
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And I picked up almost 3 mph but my ET. dropped by 1.5 tenths. ????
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: Lowered my timing by 3 degrees
[Re: polyspheric]
#2666305
06/15/19 08:01 PM
06/15/19 08:01 PM
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Joined: Jan 2003
Posts: 19,377 Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,377
Las Vegas
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What ignition system do you have. You would be surprised what would happen if you have a way to ad timing down low and take it away up top.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Lowered my timing by 3 degrees
[Re: pittsburghracer]
#2666390
06/16/19 08:16 AM
06/16/19 08:16 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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And I picked up almost 3 mph but my ET. dropped by 1.5 tenths. ???? I am thinking he meant .015. One and a half thousandths. Ron
Last edited by 383man; 06/16/19 08:17 AM.
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Re: Lowered my timing by 3 degrees
[Re: 383man]
#2666403
06/16/19 08:44 AM
06/16/19 08:44 AM
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Joined: Dec 2012
Posts: 1,824 Wind Gap,Pa.
Sammy
OP
top fuel
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OP
top fuel
Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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Whats the combo ? Eng , heads , cam and so on ? Ron It's a 4.200 bore 3.79 stroke with a 6.50 rod in a 48* block. 16:1 compression. I'm ballz deep in this engine. Fully CNC ported W9 heads now. A little to much maintenance to run but this combo screams. I need a little more gear to spin it harder. 68 Dart that weighs 2955lbs.
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Re: Lowered my timing by 3 degrees
[Re: pittsburghracer]
#2666405
06/16/19 08:48 AM
06/16/19 08:48 AM
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Joined: Dec 2012
Posts: 1,824 Wind Gap,Pa.
Sammy
OP
top fuel
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OP
top fuel
Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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That is a big change. Not sure what your ET is but if the car is very fast at all then that is a bunch of horsepower that you picked up. 8.67@154 with 35 degrees timing 8.70@157 with 32 degrees 60 foot is a little off @32 degrees. 1.23 60 foot is 1.18 @ 35 degrees .03 not .30. And where is the 1.5 tenths in the first post I'm getting too old. Grabbed the wrong time slip and slowest pass was 8.82@156.90 with a dead hook with 32 degrees timing.
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666434
06/16/19 09:57 AM
06/16/19 09:57 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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In my limited experience, very high CR is more sensitive to spark setting. Decades ago, Yamaha road racers set spark to .1mm (.004"), and warned riders that if using WOT below 5,000 RPM the engine would lock up. It did, but it was faster if you're careful.
Boffin Emeritus
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Re: Lowered my timing by 3 degrees
[Re: polyspheric]
#2666438
06/16/19 10:11 AM
06/16/19 10:11 AM
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Joined: Feb 2005
Posts: 20,186 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,186
PA.
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That's a good running combo for sure but like you said it comes with a cost. High fuel costs, high RPM, original build costs, new and better stuff coming out all the time so we upgrade for a few hundredths, and constant rebuilds. Probably a big reason I'm dragging my feet on my 572. Mines a budget build compared to what the hitters are running and my income is going down faster than it is going up. Heck my Friends are running 4.60's at my local tracks 'heads up" series and drive them often.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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