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Re: Lowered my timing by 3 degrees
[Re: AndyF]
#2666523
06/16/19 02:37 PM
06/16/19 02:37 PM
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Joined: Aug 2003
Posts: 4,679
On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,679
On the parachute mount
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It might not want timing to get the car moving, he might be making more power with less timing and overpowering the tires. I'd keep the timing at the lower number and try to get it too hook. t This was my first thought. Mph is the indication of the power your making, et is just the application of that power. You running a slick, it prob spinning . Work on your suspension now
....BAD A$$ STREET CAR.....
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Re: Lowered my timing by 3 degrees
[Re: n20mstr]
#2666533
06/16/19 02:49 PM
06/16/19 02:49 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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It might not want timing to get the car moving, he might be making more power with less timing and overpowering the tires. I'd keep the timing at the lower number and try to get it too hook. t This was my first thought. Mph is the indication of the power your making, et is just the application of that power. You running a slick, it prob spinning . Work on your suspension now It's dead hooking, no spinning at all. I run a bias slick. So do I leave it at 32* or put at 35* ? Air fuel is dead on at 12.8 at WOT.
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Re: Lowered my timing by 3 degrees
[Re: 383man]
#2666549
06/16/19 03:41 PM
06/16/19 03:41 PM
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Joined: Aug 2003
Posts: 43,193
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,193
Bend,OR USA
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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 One and a half hundreds = .015  , one and half thousands should be written as .0015, not .015  Dang details anyways  
Last edited by Cab_Burge; 06/16/19 03:42 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Lowered my timing by 3 degrees
[Re: Cab_Burge]
#2666564
06/16/19 04:07 PM
06/16/19 04:07 PM
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Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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So do I leave it at 32* or put at 35* ? Are those the only choices?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Lowered my timing by 3 degrees
[Re: Cab_Burge]
#2666566
06/16/19 04:14 PM
06/16/19 04:14 PM
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Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
Sammy
OP
top fuel
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OP
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Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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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 One and a half hundreds = .015 , one and half thousands should be written as .0015, not .015 Dang details anyways This is just one outing that I'm showing how my ET goes up with the higher timing but mph drops. This is my new engine going from W8 heads. Both engines showed the same results. The less timing equates to more MPH . The engine dyno made most HP @ 35 degrees. You cant measure MPH on the dyno. 60 foot is a tad weaker with 32 degrees timing.
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666588
06/16/19 05:36 PM
06/16/19 05:36 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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It might not want timing to get the car moving, he might be making more power with less timing and overpowering the tires. I'd keep the timing at the lower number and try to get it too hook. t This was my first thought. Mph is the indication of the power your making, et is just the application of that power. You running a slick, it prob spinning . Work on your suspension now It's dead hooking, no spinning at all. I run a bias slick. So do I leave it at 32* or put at 35* ? Air fuel is dead on at 12.8 at WOT. As fast said, are those your only choices? I think you need to test some. Run just 60 foot times and set the timing for your best 60's. Then start backing timing out of it and run the 1/4. My best guess is, like most N/A cars with decent chassis, your car will like more timing in low gear and want it backed down in high gear, or maybe pull it out in second. Guys pulling timing and going quicker in 60 feet with N/A combos usually need chassis tuning. This nonsense that less timing is always better is just that. If it wants more timing in low gear, give it more timing. Look at the plugs and let them tell you if you are wrong or not.
Last edited by madscientist; 06/16/19 05:36 PM.
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: madscientist]
#2666617
06/16/19 06:54 PM
06/16/19 06:54 PM
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Joined: Dec 2005
Posts: 11,578
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,578
Fulton County, PA
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High gear retard is a real thing and is used by those looking to get the last bit of performance. Was being done years ago by class racers, etc. You can do it electronically or put a switch on the shifter and do it with an MSD retard box, depending on your ignition. Or just set the timing where it gives the results you're looking for - go fast, repeat 60s, not run the engine on "kill".
If the results don't match the theory, change the theory.
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666854
06/17/19 11:51 AM
06/17/19 11:51 AM
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Joined: Jan 2003
Posts: 19,367
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,367
Las Vegas
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IMO I would ADD some timing in low gear and then begin to pull it back on each gear change. Adding timing at the hit will help burn the fuel that accumulates from being on the two step. Further adding timing will help the engine make more power with the lower load it has in first gear and increase efficiency. If it is a three speed I would pull back a couple degrees in second and in high go back to base or where it makes the best MPH. In the end you will have to experiment to find the ideal place for timing to be. Not unusual for timing to be changed from the dyno for many reasons. Increased altitude, moisture in air or two very common reasons. You need to find a curve that accelerates the car the best. That's generally is more down low then 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: fast68plymouth]
#2666915
06/17/19 02:02 PM
06/17/19 02:02 PM
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Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
Sammy
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top fuel
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OP
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Joined: Dec 2012
Posts: 1,824
Wind Gap,Pa.
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So do I leave it at 32* or put at 35* ? Are those the only choices? Fastest ET was at 35* Fastest MPH is at 32*
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Re: Lowered my timing by 3 degrees
[Re: Al_Alguire]
#2666916
06/17/19 02:04 PM
06/17/19 02:04 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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IMO I would ADD some timing in low gear and then begin to pull it back on each gear change. Adding timing at the hit will help burn the fuel that accumulates from being on the two step. Further adding timing will help the engine make more power with the lower load it has in first gear and increase efficiency. If it is a three speed I would pull back a couple degrees in second and in high go back to base or where it makes the best MPH. In the end you will have to experiment to find the ideal place for timing to be. Not unusual for timing to be changed from the dyno for many reasons. Increased altitude, moisture in air or two very common reasons. You need to find a curve that accelerates the car the best. That's generally is more down low then up top. Getting my laptop plugged in to my 7531 MSD Box and was wondering if you have ever done this timing curve before? Not sure when to start pulling timing out.
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666927
06/17/19 02:36 PM
06/17/19 02:36 PM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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Add switches to your shifter.
"use it 'till it breaks, replace as needed"
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Re: Lowered my timing by 3 degrees
[Re: Sammy]
#2666948
06/17/19 04:04 PM
06/17/19 04:04 PM
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Joined: Jan 2003
Posts: 19,367
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,367
Las Vegas
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Yes I have been awhile on the 31 box as been using a Grid for a few years. But I am seem to recall the ability to add/subtract timing based on gear changes. It senses the RPM drop on the shift and will trigger the stage, which is a number you may need to tailor to your car. Guess I need to brush up on my 7531 stuff been like 8 years
"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: Al_Alguire]
#2666953
06/17/19 04:24 PM
06/17/19 04:24 PM
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Joined: Jan 2003
Posts: 19,367
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,367
Las Vegas
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Now I remember why I switched to the Grid, WAY more user friendly. Anyway here is a video, you would have start with however much advance you want to begin with and enter retards from there. With a grid you just ad to the base on the scree and don't have to touch the distributor/crank trigger. In the 31 you will have to add the timing to the distributor/crank trigger and subtract from there https://www.youtube.com/watch?v=Er-z-uyW0Us
"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: Cab_Burge]
#2667044
06/17/19 10:35 PM
06/17/19 10:35 PM
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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 One and a half hundreds = .015 , one and half thousands should be written as .0015, not .015 Dang details anyways Yes you are right as I meant one and a half thousandths but did write it wrong as it should be as you put it .0015. Sorry about that. Ron
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