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-   -   spool versus posi (https://classracer.com/classforum/showthread.php?t=1033)

nwebber 05-14-2007 05:10 PM

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.


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?


Jeff Lee 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.



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