SN95 24 hours lemons Build Thread Profile - SN95 Mustangs

[johnjamesmiller]

 

[Dave_W]

You can get either Moser or Strange for about $300 for the pair. Need to know if it's 28- or 31-spline. Was the 31-spline only used in an SN95 for the IRS Cobra?

Alloy Axles Archives

Each Strange forged alloy axle is manufactured to your exact specifications.

www.strangeengineering.net

Shop Ford Applications - MoserEngineering.com

Shop for Ford Applications on MoserEngineering.com.

www.moserengineering.com

 

[johnjamesmiller]

In with the new - out with the old!

play by play recap-

Magnet pulled some interesting metal out of the old

carrier bearings were pitted

Swapped ring gear onto tru trac

Left the pinion alone - didn’t have the confidence to set pinion depth. Maybe next time!

set backlash, checked gear pattern, replaced bearings, seals, and installed some used axels that were in good shape.

Top it off with shiny new finned cover. Over looked ordering the one with linger


to upgrade rear brakes you need differential anchor brackets. I had ford ones on order for months before I decided to go with th dual caliper brackets. I will only run one caliper though

Dual Caliper Brackets for 79-04 Mustang

Mustang Dual Caliper Brackets 8.8 SRA

driftamerican.com

10.5 vs 11.5



vented is much wider! Had to clearance the caliper brackets to make it fit.

Pulled arp studs in with some low grade nuts, grade 8 washers and impact. First go used generic washers and those got ate up pretty quick!



Went to reference Haynes manual before rebuilding the rear calipers and was surprised to see this. And they were right it was a total pain.

No joke first one took 10 hours. 9 of those were trying to get one snap ring in place. once I bought the right snap ring plyers for $15 it was easy and only took an hour.


new brake hoses and all back into place.

 

[ArizonaBOSS]

I'm not sure about the SN95, but on the S197 it's less trouble just to replace the caliper altogether rather than try to rehab them. The cost isn't astronomical.
It could be worth trying to rig up some rear brake cooling (deflectors, or scoop and tube) if you keep having issues.
You might also consider rigging up a differential cooler setup considering the long hours you will be putting on the car on-track.

That paint scheme looks great! Probably one of the best-looking LeMons cars I've seen yet.

 

[johnjamesmiller]

I agree with buying rear calipers over rehab. Probably last time I rebuild!

any examples of functional rear scoops for brake cooling?

I’m sure there’s some good examples of diff cooling on this site I can learn from. I’m always hyper aware of extra leak points - seems to cause an inordinate number of failures in crap can endurance racing. Part of me wants to say I’ve made 2x24 with current setup so finned cover will only be better but from what I understand tru trac runs hotter so maybe I am worse off? I’ve thought about a passive solution - scoop under diff that pulls more air up to diff.

 

[Bill Pemberton]

Dang we are neighbors and I don't believe we have met. Great writeup and hopefully we will meet up in the future --- there are quite a few TMO members in the Omaha/Lincoln Metro area!

 

[ArizonaBOSS]

I agree with buying rear calipers over rehab. Probably last time I rebuild!

any examples of functional rear scoops for brake cooling?

I’m sure there’s some good examples of diff cooling on this site I can learn from. I’m always hyper aware of extra leak points - seems to cause an inordinate number of failures in crap can endurance racing. Part of me wants to say I’ve made 2x24 with current setup so finned cover will only be better but from what I understand tru trac runs hotter so maybe I am worse off? I’ve thought about a passive solution - scoop under diff that pulls more air up to diff.

I don't have any direct examples for rear brake deflectors, but you might find some in @Fair 's posts on S550 content that you could get some inspiration from. He definitely has some info on front brake deflector systems that were developed with info from one of our TMO members so you might be able to get some ideas there and port them to your rear SRA.

But, you are already sort of thinking that direction with respect to your diff cooler scoop idea. Same type of principle.

FWIW, many Grand-Am teams run powered-pump cooler (active) systems for the diff. Those are cars that run 2-4 hour races at full tilt. You will be running more time with the usual LeMons stuff--so you need to do *something*. Agree that an active system adds more potential failure points and complexity.

 

[johnjamesmiller]

@Bill Pemberton looking fwd to it!

tonight finished adding arp studs to the front, rebuilding front calipers, pads, and rotors. Just need to bleed the brakes, slap wheels on it and I can drive it again!


used the slightly larger knurl studs so had to drill the hubs out. First bit I was arrogant with and ruined it in 3 holes. Second bit I took my time, dipping it in water and then oil often and it made it through the last 7 holes fine.

https://www.amazon.com/gp/aw/d/B00FXHBSGK?psc=1&ref=ppx_pop_mob_b_asin_title

Old carbotech rp2s don’t look too bad for doing 2x24 hour races. Melted caliper seals and groved rotors both times but pads came out fine!



giving raybesto st47 a try. Partially just to experiment and partially hoping they are a little nicer to rotors.

 

[johnjamesmiller]

Found some old pictures, realized I hadnt updated this in a while.

Finishing off the 2022 prep

Relocated battery to the trunk and reduced weight by 19.5# using a 9 pound Braille b219 battery.


Boxed in the radiator, moved the overflow tank to where the battery was, added a second transmission cooler.


Added some big wheels I got used. Enkei PF01 18x10.5 with 38 mm offset, 295 Yokohama AO52. Wheel offset larger then I would like but price was right. Compensated with 31mm spacers from opmustang.


Had to add front flares. Used tandem axel trailer fender cut in half. Cut the back half of the front fenders and folded them in.

69x6 Smooth Aluminum Tandem Axle Teardrop Fender Flare - One Fender

69"x6 1/2" Marine Grade Aluminum Tri Axle Trailer Fender Flare. American Made. Fast & Affordable Shipping. Easy Installation. Enclosed Trailers, Boat Trailers, Utility Trailers & More.

trailer-fenders.com

Weight redux - overall removed 70 pounds

• 20# skinning doors
• 19.5# lighter battery
• 9.2# dog bone
• 8.8# rear bumper body kit
• 4.4# air pump
• 3.6# light bar
• 1.8# trunk weather stripping
• 1.2# door weather stripping
• 1.5# from wheel stop boxes

Had one issue in hot pits when lights were left on during driver change and battery died - maybe that 19.5# savings wasnt worth it! Had to get pushed in to jump.

Year	Best lap	Total laps
2020	2:29	300
2021	2:25	367
2022	2:19	286

Unsure why total laps were down. Must have decided to sleep?

 

[johnjamesmiller]

2023

Changed from 3.27 to 3.55 gears. Glad I got the crush sleeve eliminator because I had to re-install the gears a dozen times before I was happy with the pattern.


Added a mesh screen in front of the radiator to protect from rocks.

Gutted fuel neck so we can fuel faster.

Got an 03-04 hood and cut a hole behind the radiator for better venting.

Tried an Aerostar aluminum driveshaft but had the wrong yoke. Was 1/8 inch too thin. I didn't realize it until I was loading on the trailer and all red fluid poured out!


Had decent trouble keeping it running well. Thought it was fuel filter getting clogged but finally realized hitting the governor on the back straight was the issue. After a few times the AFR would go really lean until we restarted.

Burned through what was left of the big tires and had to switch back to the small ones.

Going the wrong way on results but having more fun each year!

Year	Best lap	Total laps
2020	2:29	300
2021	2:25	367
2022	2:19	286
2023	2:21	237