spool versus posi

nwebber · 05-14-2007, 05:10 PM

Anyone have experience in the value of a spool versus a posi unit? I currently have posi in a L/SA 305 Malibu and am wondering if it would be a cost effective upgrade.

Rick Angles · 05-14-2007, 08:55 PM

Glad you posted this question. I have been wondering the same thing as I build my T/SA 231 V6 Starfire. I assume the answer will be about how much HP one has. Or maybe car weight. Or maybe both?

05-15-2007, 02:30 AM

My opinion: Either will drive both tires (as long as the posi is functioning properly). I have a friend with a J/SA Pontiac with a posi. Video shows what we suspected, it needs to be rebuilt as the right rear doesn't seem to be engaging properly. We're going to replace it with an aluminum spool. On a low HP application (maybe I should say low torque), I believe every effort should be made to reduce every once of reciprocating weight in the trans, driveshaft, rear-end and wheels / tires. If it were my car, that's what I would do!
Good luck...

NHRA #7494 SS/H
1970 AMC AMX
"Best Appearing" @ NHRA '06 Pacific Sports Nationals
JeffLeeAzRealty@Qwest.net
602-418-9797

Stewart Way · 05-15-2007, 10:23 PM

Jeff
Might want to reduce the rotating weight too.

nwebber · 05-15-2007, 11:48 PM

Thanks for the responses. So if money is a factor which would be a better investment, spool at a 10 pound savings or a metric 200 trans?

Bruce Fulper · 05-16-2007, 01:42 AM

Friction is what you want to reduce. In a low hp combination why have a spool. When you use a spool you're always seeing more friction. All you need to do --- is make the car hook.

I miss step.

Robert Kelliher · 05-16-2007, 08:05 AM

I highly recommend to go to a spool. posi will have some give no matter how well it is. you don't want it to cause the car to launch to right. plus a spool is lighter.

Dave Ribeiro · 05-16-2007, 09:35 AM

Back to what Jeff was refering too, have you ever see a car spinning just one wheel and the other is glue to the track ????
How can you tell when this is going to happen, do it right the first time, its cheaper in the long run...Plus weight and durability...LOL
Dave...1033/stock(350) RV-455

slowstocker · 05-16-2007, 04:30 PM

Spool is the way to go just be careful if the staging lanes are wet because the car wont like to turn. I know.

SSDiv6 · 05-16-2007, 04:32 PM

Also, make sure to check the front end chassis/alignment too.

05-14-2007, 05:10 PM	#1
nwebber Junior Member Join Date: May 2007 Location: springfield OR Posts: 70 Likes: 1 Liked 39 Times in 5 Posts	spool versus posi Anyone have experience in the value of a spool versus a posi unit? I currently have posi in a L/SA 305 Malibu and am wondering if it would be a cost effective upgrade. __________________ Norm Webber

05-14-2007, 08:55 PM	#2
Rick Angles Member Join Date: Dec 2006 Location: Circleville,Ohio Posts: 113 Likes: 0 Liked 0 Times in 0 Posts	Glad you posted this question. I have been wondering the same thing as I build my T/SA 231 V6 Starfire. I assume the answer will be about how much HP one has. Or maybe car weight. Or maybe both? __________________ Rick

05-15-2007, 10:23 PM	#4
Stewart Way Member Join Date: Aug 2003 Location: Atlanta Posts: 476 Likes: 20 Liked 70 Times in 22 Posts	Jeff Might want to reduce the rotating weight too. __________________ Stewart Way 2424 SS

05-15-2007, 11:48 PM	#5
nwebber Junior Member Join Date: May 2007 Location: springfield OR Posts: 70 Likes: 1 Liked 39 Times in 5 Posts	Thanks for the responses. So if money is a factor which would be a better investment, spool at a 10 pound savings or a metric 200 trans? __________________ Norm Webber

05-16-2007, 09:35 AM	#8
Dave Ribeiro VIP Member Join Date: Sep 2002 Location: Williamsburg, Va.---USA Posts: 1,827 Likes: 1,612 Liked 56 Times in 27 Posts	Back to what Jeff was refering too, have you ever see a car spinning just one wheel and the other is glue to the track ???? How can you tell when this is going to happen, do it right the first time, its cheaper in the long run...Plus weight and durability...LOL Dave...1033/stock(350) RV-455 __________________ Dave Ribeiro 1033 STK

05-15-2007, 02:30 AM	#3
Jeff Lee Guest Posts: n/a	My opinion: Either will drive both tires (as long as the posi is functioning properly). I have a friend with a J/SA Pontiac with a posi. Video shows what we suspected, it needs to be rebuilt as the right rear doesn't seem to be engaging properly. We're going to replace it with an aluminum spool. On a low HP application (maybe I should say low torque), I believe every effort should be made to reduce every once of reciprocating weight in the trans, driveshaft, rear-end and wheels / tires. If it were my car, that's what I would do! Good luck... NHRA #7494 SS/H 1970 AMC AMX "Best Appearing" @ NHRA '06 Pacific Sports Nationals JeffLeeAzRealty@Qwest.net 602-418-9797

05-16-2007, 01:42 AM	#6
Bruce Fulper Senior Member Join Date: Aug 2004 Location: So. Cal. Posts: 651 Likes: 4 Liked 54 Times in 33 Posts	Friction is what you want to reduce. In a low hp combination why have a spool. When you use a spool you're always seeing more friction. All you need to do --- is make the car hook. I miss step.

05-16-2007, 08:05 AM	#7
Robert Kelliher Junior Member Join Date: Dec 2006 Location: New Hampshire Posts: 18 Likes: 0 Liked 0 Times in 0 Posts	I highly recommend to go to a spool. posi will have some give no matter how well it is. you don't want it to cause the car to launch to right. plus a spool is lighter.

05-16-2007, 04:30 PM	#9
slowstocker Junior Member Join Date: Feb 2007 Posts: 34 Likes: 0 Liked 0 Times in 0 Posts	Spool is the way to go just be careful if the staging lanes are wet because the car wont like to turn. I know.

05-16-2007, 04:32 PM	#10
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,036 Likes: 711 Liked 1,538 Times in 575 Posts	Also, make sure to check the front end chassis/alignment too.