AChotrod

iTrader: (17)

So how much really is lost at the tires when dropping a S60 Into your cars rear! Well I just did this an Speedinc was Kind enough to test it out for all of us!!!! Thanks Larry!!!!!!
PS. Just so everyone Knows I gained it all back plus a couple extra HP/TQ just by adding a cut out. 413/366 is with S60 and open cutout

Stock 10bolt 3.42s w ls1 alum DS Vs. Dana S60 ,true track, 35 spline, 4.10s and CM DS cut out closed both runs
It only lost 13.57rwhp and 12.38rwtq

gator's 99TA

iTrader: (2)

so its not as insufficient as some think.

caliswangin916

iTrader: (3)

close your cutout and take it to the track and let us know how it does with less hp. what are your times on the stock rear?

AChotrod

iTrader: (17)

Now that cant happen! The last time it was at the track the car was basically stock and put out 280/317. I did alot of work as you can see since its putting 413/366 now.
It wont be a fair comparison.
Besides I switched from 3.42 to 4.10s and that also in not a fair comparison
The Dyno Is the best way to show power loss and the dyno was done this morning!!
Only way to test it accurately at the track would be to do the swap and runs at the track on the same day with the same gearing.

A spool would be even less loss to the tires

Scott@DrivelineSolutions

iTrader: (22)

Putting more weight over the rear wheels pays for itself though. I had a customer that gained ET when we changed from a 10 bolt with a 4.10 to a 9 inch with 4.11, car hooked better and he didn't loose any MPH.

wrd1972

iTrader: (12)

I would say my 9" would have similar results.

AChotrod

iTrader: (17)

I would agree with you! We almost have the same set up and numbers. But your a 9" and me an S60.

wrd1972

iTrader: (12)

Looking at the dyno graph, you need to rev it a bit higher. The lines did not level out.
What cam are you running?

Big Bird WS6

iTrader: (9)

but on a 1000 horse car. that would be like 50 to 60 horse loss

KBG

iTrader: (32)

but on a 1000 horse car....this would be one of your only options and probably the only way to go

i don't think a 12 bolt would fit the bill

speed_demon24

iTrader: (6)

With that valve float past 6500 that would be a bad idea.

studderin

iTrader: (28)

I also did a back to back dyno

10bolt/ S60
https://ls1tech.com/forums/gears-axl...o-numbers.html

SladeX

I think the gear change plays a part in this as well, unless we get a I went from 4.10 10 bolt to 4.10 9 inch (or 4.11) we aren't completely ruling out the full effect. I do admit though that increased rotational mass will inevitably lead to a loss, as on a dyno, the real added weight the dyno will see is in the increased gear size, differential and axles. I can imagine shaving off weight in the drivetrain like a twin disc clutch and aluminum flywheel and carbon fibre driveshaft could easily offset the weight added to the drivetrain.

LM97Z

iTrader: (4)

I didn't loose any MPH going from a 10 bolt with 3.42s to a spooled 9" with 4.11s, even added a BMR TA & steel 3" driveshaft, either way you look at it, the added weight is well worth the insurance, & in the long run, your not looseing much, but your gaining alot IMO.

382ssz28

iTrader: (24)

I noticed a slight difference in the exhaust note. There's definately a difference with the extra weight, but the security outweighes any of that. I like the Dana!

AChotrod

iTrader: (17)

So far I am very happy with my S60!!! No gear whine at all and really doesnt feel any different than the 10bolt.