Time for Some Strong FBI Medicine

[Jagdpanzer]

The 402 stroker I installed last summer in the meantime has been playing rough with the rest of the Z's drive train.
I've had enough headaches with busted stock and custom billet 27 spline spindles, wounded Valeo single disc clutch setups with rickety pull style throw out bearings and OEM trac-lock differential spider gears that could gernade during the next hard launch at the track.
So I've turned to the FBI medicine cabinet for strong relief.

http://i540.photobucket.com/albums/gg333/pwasinger/photo1_zps0ecc1227.jpg

* RAM Dual Disc 9.5 Clutch Assembly PN 75-2179 with push style throw out bearing conversion
* Eaton Detroit Truetrac Differential PN 913A614
* Mark Williams 31 spline hardened billet spindles PN BG-1
* Mark Williams SKF HD bearing hubs PN BG-2 bored out and broached for 31 splines
* Tom's Differential Dana 44 rebuild kit
* Dana Spicer Viper 4.10 gear set with larger 7/16" ring gear bolts (Thanks Gibby)

http://i540.photobucket.com/albums/gg333/pwasinger/photo2_zpsca1ec2e0.jpg

MW 31 spline spindles next to one of the 27 spline billet spindles showing strain from the 402's greater torque (the other side broke)

http://i540.photobucket.com/albums/gg333/pwasinger/photo3_zps50193661.jpg

The SKF HD bearing hub bored and broached to 31 splines next to a stock OEM hub.

Great thanks to the brave FBI ZR-1 pioneers Pete, Bob and others for blazing the trail that made these solutions possible and available to the rest of us.

[alnukem]

Looks like some serious hardware! Is this a 4.125"x3.76" motor?

[Jagdpanzer]

Looks like some serious hardware! Is this a 4.125"x3.76" motor?

No, 4.00" x 4.00"

[QB93Z]

That's Nice!!!!!

Jim

[pantera1683]

Phil, any comments on your 4" x 4" 402? This is the route I am taking with my build and am interested in your impressions of it so far.

[XfireZ51]

Phil,

Take 2 discs and call Al in the morning.

[Scrrem]

Man Phil, raising the WAZOO bar again. I don't think I'll every catch up. This should put an end to your equipment failures....good stuff!!
Rich

[Jagdpanzer]

Phil, any comments on your 4" x 4" 402? This is the route I am taking with my build and am interested in your impressions of it so far.

I'm quite satisfied with how the 402 turned out. With the extra torque and power the car is even more of a blast to drive than before. In 1st and 2nd it shows no respect toward the 345/30-19 Michelin SS rear tires. I'm sure the improved responsiveness also has a lot to do with not having to wait on the poky secondarys to open up after you've put the hammer down. Otherwise it behalves like before when driving around town with little noticeable difference in gas milage.

[alnukem]

What type of torque number are you putting out?

[Jagdpanzer]

Around 490 lb/ft

[Blue Flame Restorations]

Gotta love that CSI "Chicago Skunkworks Inc." (FBI) group. Here's your logo Pete!

[secondchance]

The 402 stroker I installed last summer in the meantime has been playing rough with the rest of the Z's drive train.
I've had enough headaches with busted stock and custom billet 27 spline spindles, wounded Valeo single disc clutch setups with rickety pull style throw out bearings and OEM trac-lock differential spider gears that could gernade during the next hard launch at the track.
So I've turned to the FBI medicine cabinet for strong relief.

http://i540.photobucket.com/albums/gg333/pwasinger/photo1_zps0ecc1227.jpg

* RAM Dual Disc 9.5 Clutch Assembly PN 75-2179 with push style throw out bearing conversion
* Eaton Detroit Truetrac Differential PN 913A614
* Mark Williams 31 spline hardened billet spindles PN BG-1
* Mark Williams SKF HD bearing hubs PN BG-2 bored out and broached for 31 splines
* Tom's Differential Dana 44 rebuild kit
* Dana Spicer Viper 4.10 gear set with larger 7/16" ring gear bolts (Thanks Gibby)

http://i540.photobucket.com/albums/gg333/pwasinger/photo2_zpsca1ec2e0.jpg

MW 31 spline spindles next to one of the 27 spline billet spindles showing strain from the 402's greater torque (the other side broke)

http://i540.photobucket.com/albums/gg333/pwasinger/photo3_zps50193661.jpg

The SKF HD bearing hub bored and broached to 31 splines next to a stock OEM hub.

Great thanks to the brave FBI ZR-1 pioneers Pete, Bob and others for blazing the trail that made these solutions possible and available to the rest of us.

Thank you for blazing the trail locally.:cheers:

[XfireZ51]

After Al broke his spindle a couple of years ago at BG, he started investigating more hardened spindles for his 441. He pretty much was the guy that came up w the combo of spindle/hub bearing you see Phil using here. Quite a few guys contribute to pushing the envelope here in the Windy. Some talented people who just don't know better. ;)

[alnukem]

Around 490 lb/ft

Beats the snout out of a 350's torque number. Gotta be fun!

Was the twisted axle because of slicks?

[Jagdpanzer]

Was the twisted axle because of slicks?

Happened with MT 315/35-17 DRs at 16 psi at the drag strip last fall.

http://www.zr1.net/forum/showthread.php?t=21134&highlight=mason+dixon

[FU]

How's the Tru Trac unit ? I used them many years ago at the sand - mud 4X4 races and thought they were great. We used a Detroit Locker in the rear and a TT up front. Worked nice with lot of power.

The next problem on my car is going to be the spider gear's and the posi case. I cracked the stock spider gears once before.

I think to avoid most of these parts is just coming out of the box a little easier on street sticky's instead of DR's.

:cheers:

[Blownrunner]

I read a magazine article stating the ZR-1 tranny was designed to take 425 hp. I guess once you start modding the car, there is no end to it.

[PhillipsLT5]

Gotta love that CSI "Chicago Skunkworks Inc." (FBI) group. Here's your logo Pete!

CSI, I like it

[cvette98pacecar]

Phil, I have just one word to say. "SWEEEET"
:cheers:

[rkreigh]

I saw this collection of ZR-1 porn at phil's place

my wallet winced in pain

somehow I don't think phil will be coming out ez based on the spindles who gave their life for a better launch

inquiring minds want to know, what rpm will you be leaving at?

the dual disk will surely hold the power, and not be as friendly towards slipping

I think my fidanza saves me a bit (albeit with a crappy launch" as it doen't dump as much inertia

on the TT car, I gave up and went auto, 800 ft lbs didn't like clutches

[Paul Workman]

I'm quite satisfied with how the 402 turned out. With the extra torque and power the car is even more of a blast to drive than before. In 1st and 2nd it shows no respect toward the 345/30-19 Michelin SS rear tires. I'm sure the improved responsiveness also has a lot to do with not having to wait on the poky secondarys to open up after you've put the hammer down. Otherwise it behalves like before when driving around town with little noticeable difference in gas milage.

Interesting. What did your compression ratio end up being, and what is your shift light set at, if I may??

Paul.

[Jagdpanzer]

Paul,
12.3 to 1 and 6700 rpm