H-I-J '76 Nova re-fit.

Nmbr1GMfan · 11-01-2018, 04:30 PM

Quote:

Originally Posted by 6130

Is there a mathematical formula for determining SLR on a stick car? I'd be curious to see how far off my old race car was.

6130 · 11-03-2018, 02:37 PM

Quote:

Originally Posted by Nmbr1GMfan

Thanks, Todd.

I wonder if they have a chart that goes down low enough for my old car. It was about 250 horsepower and about 2100 pounds, using 9x25.5" bias slicks.

Nmbr1GMfan · 11-03-2018, 06:29 PM

Quote:

Originally Posted by 6130

Thanks, Todd.

I wonder if they have a chart that goes down low enough for my old car. It was about 250 horsepower and about 2100 pounds, using 9x25.5" bias slicks.

I'm sure the math could be disected down to near anything, I believe the math is also different for an auto combo.

Glenn Briglio · 11-04-2018, 08:02 AM

Quote:

Originally Posted by Nmbr1GMfan

I'm sure the math could be disected down to near anything, I believe the math is also different for an auto combo.

Have you seen any math for the auto combo?

Nmbr1GMfan · 11-04-2018, 06:33 PM

Quote:

Originally Posted by Glenn Briglio

Have you seen any math for the auto combo?

I have in the past, and it's different in the aspect of the 2x torque multiplication of the converter. Basically the SLR # would be lower based on that.

Nmbr1GMfan · 11-04-2018, 06:42 PM

Saturday we spent the day cleaning up the shop, wow what a wreck! Today was actually 12 months to the day when the teardown began so I went in and just had a nice slow day. I had a plan to start dialing in the front wheel bearings but what I realized was I never checked the front brake drag after the system was finished. Needless to say, something isn't perfect as they do spin, just not real free. I'll get this lined out before the Nov. 25th test day.

Hacksaw · 11-05-2018, 09:50 AM

Quote:

Originally Posted by Glenn Briglio

Have you seen any math for the auto combo?

Several years ago ATI had a formula for the auto combo. Can't seem to find it anywhere.

Glenn Briglio · 11-05-2018, 01:11 PM

Quote:

Originally Posted by Hacksaw

Several years ago ATI had a formula for the auto combo. Can't seem to find it anywhere.

I remember seeing it.......it was based on engine stroke alone ....I think lol

FED 387 · 11-05-2018, 01:50 PM

there are various charts that have been around for quite a few years--- basically they all use rear gear ratio multiplied by first gear ratio---a guy named Dick Miller had a book out way back called""" hook & launch"""" or something like that where he used stroke and weight to calculate his numbers---others (Walcott) ATI etc. have charts that use tire diameters and other variables like HP to do their calculations---I believe that most of these are for AUTO trans cars not MANUAL trans cars---but even then those numbers might get you somewhat close as opposed to way out in left field trying to get a reasonably close ratio---bottom line is a 3000 lb car with a 5:00 gear and a 3:00 first gear making 400 HP and a 28-30 inch tire needs XXX ratio to be close ---you just have to figure that number out --- probably going to be somewhere about 10.00 -12.5 SLR probably----FED 387

11-04-2018, 06:42 PM	#6
Nmbr1GMfan VIP Member Join Date: Aug 2013 Posts: 1,763 Likes: 1,197 Liked 1,955 Times in 492 Posts	Re: H-I-J '76 Nova re-fit. Saturday we spent the day cleaning up the shop, wow what a wreck! Today was actually 12 months to the day when the teardown began so I went in and just had a nice slow day. I had a plan to start dialing in the front wheel bearings but what I realized was I never checked the front brake drag after the system was finished. Needless to say, something isn't perfect as they do spin, just not real free. I'll get this lined out before the Nov. 25th test day. __________________ Todd Greene

11-05-2018, 01:50 PM	#9
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,428 Likes: 560 Liked 335 Times in 182 Posts	Re: H-I-J '76 Nova re-fit. there are various charts that have been around for quite a few years--- basically they all use rear gear ratio multiplied by first gear ratio---a guy named Dick Miller had a book out way back called""" hook & launch"""" or something like that where he used stroke and weight to calculate his numbers---others (Walcott) ATI etc. have charts that use tire diameters and other variables like HP to do their calculations---I believe that most of these are for AUTO trans cars not MANUAL trans cars---but even then those numbers might get you somewhat close as opposed to way out in left field trying to get a reasonably close ratio---bottom line is a 3000 lb car with a 5:00 gear and a 3:00 first gear making 400 HP and a 28-30 inch tire needs XXX ratio to be close ---you just have to figure that number out --- probably going to be somewhere about 10.00 -12.5 SLR probably----FED 387