Race ratio micro polished rear end gears.

[@mikedimaio1237]

I always looked at ring & pinion gears and thought they should be smoother, never thought about polishing them, thanks for the info.

[@fredblase5608]

I don't think David looked "GRUMPY" more like super "FOCUSED"!! You guys are after the ever elusive last bit of performance available!! Don't remember what video it was, The crew drained the Differential lube to reduce oil pumping loss, picked up a bit of time off and won a national champion drag race!

[@garyhosier4765]

It’s so good to see you and Andy making such a great team. Keep up the good work. God Bless.

[@daledavies2334]

Used to Corner Marshal at Race City in Calgary, Alberta. The American Indycar Series came up a few years. These are Indy cars that have been retired from the series and private racers buy them up. Some are wealthy guys that like to race and some were using it as a stepping stone to get into the Indycar Series. The cars that had the expensive Ilmor and Cosworth engines originally, had them removed and were fitted with aluminium block Chev or Ford engines. There was one with the Buick turbo Indy Engine. For practice Saturday morning one year it rained overnight. The back straight did a 210° left and then a right 30° onto the dragstrip/main straight. That traction compound works good when dry but damp from the rain it was like grease. First driver out came around and eased into the throttle as still warming up. Did a 360 into the Armco. That killed morning practice for those guys. Club racers with less power were warned and did not have an issue. Calgary is a horse race, chuckwagon and auto drag race town, so could not get spectators out to watch them run. Track was in a great place where you could see the Calgary skyline and the Rocky Mountains about 70 miles away.

[@danawilkes8322]

Richmond gears were the worst years ago (I don't know about now). They were very noisy and the gears were very rough. I did not recommend them to anyone. I polished gears different than what they showed here. We used Walnut shell media, and it took a long time to get a somewhat smooth finish. Doing them by hand took forever. As time goes by, there is always a better way of doing things, though usually more expensive. More good information from David.

[@darwinfoster7420]

You must have problems setting up gears all my Richmond gears never were noisy and never failed on me in 50 years

[@MVPisME383]

I got Richmond heard with Yukon limited diff in my cutlass. Factory 7.5 housing 3.23 gears. I can't hear it feel them but I have 383 SBC 509hp to crank, 3in exhaust to in front of axle into a pair of 14in case flow fx mufflers. It is surprisingly quiet in the cab

[@rocketsurgeon11]

It would be interesting to see a rundown on what coatings/aftertreatment processes are best used on what parts. There's a new one that I just learned about for piston skirts that is a "self clearancing" coating from Lin2line meant to stabilize the piston in the bore which is supposed to have the effect of helping the piston rings do their job better. This idea has been used in the aerospace industry for a while to increase compressor efficiency. Steve Morris has used it in his own engine. I know that doesn't mean anything, but I found it interesting.

[@Channelscruf]

Love the knowledge this guys carpet bombs on the regular.

[@hotrodray6802]

🔔😎🇺🇲 Im a Fox 5.0 guy. Episode 66 Jan. 7, 2023, about the 3 cams, you mentioned an upcoming video summer followup. Patiently waiting. 😁 Thanks.

[@mikedeal8659]

Thanks David. Looking forward to seeing whatever you do next.

[@stevesadusky8634]

Very interesting David.. i Love how you "dig deep" in your research and experimentations!! I look forward to more of your research and development!!! 👍👍👍👍👍

[@RotaryJunkie]

18% wheel torque gain makes me think the "new" traction issues may only be partially down to track prep, but the fact it went 8.32 on a "street" surface with the new gear sort of points to it being an anti-traction prep compound. Hey, at least nobody broke drivetrain components! The huge drop in diff temp basically proves the finishing is worthwhile, though it's likely to remain one of the "last places" for the performance-minded to look when starting from a regular production vehicle just due to cost vs benefit. 5whp is 5whp, but 5whp has many inexpensive ways to be made before the (relatively) costly ones start to make sense.

[@ericschumacher5189]

WPC-Treatment is also a good way to reduce friction & increase durability....some higher end ring & pinion sets are first REM-finished (like seen in the video) then afterwards WPC-treated.....this dramatically shortens the break in process and keeps more consistent lash over its life.

[@andretorben9995]

I'd like to hear David Vizard giver his evaluation into the never ending flat tappet failures we keep hearing about.

[@JeffKopis]

I know that some cam grinders, like Delta Cams in Tacoma, WA, can resurface original OEM lifters, restoring the crown to as new. The 40-60 year old OEM lifters were made in America from a higher grade of iron. I would certainly choose reground OEM lifters over the junk they sell now!

[@JeffKopis]

Also, David did a video a while back about his endorsed oil additive called Oil Extreme, which he says works BETTER than zinc for breaking in flat tappets. Look for that video.

[@andretorben9995]

@@JeffKopisI think the oil issue has been debunked with many people using zinc additives, different oils, additives and so on but we are still seeing failures. Furthermore flat tappets were not failing like this 30 years ago and everyone agrees oils have increased lubricity these days. So it doesnt appear to be oil related. Powell machine has a series of videos in which they test the hardness and profile of both lifters and cam lobes and there is nothing conclusive. Yes some lifters are poorly made and finished but there is not a direct correlation. Even lifters with EDM oiling directly to the face which should have lots of lubrication present are failing. Seems there are still lots of theories but still nothing conclusive ??? Very odd problem.

[@mikewillett5076]

​@@JeffKopis. Several brands of lifters, even cheapies were Rockwell tested. They were all hard enough to live. It's not having the right crown on the lifters during manufacturing, and the finish on the lifters and cam lobes not being right.

[@ParmaPimp]

David, thank you for this video! I made a comment about this exact process just a couple months ago and you delivered!!! Had this idea for 2-3 years at least, if not longer. Good to see that it'll be worth the effort. Thanks again Sir.

[@richard9436]

So far you have convinced me to start with an Ecoboost Performance Pack car. Two years old and you can find them for 22k-24k. Wheels, tires, brakes, gears, bushings and paddles all in place. Looking forward to see your progress.

[@CJ5EVOLUTION]

Looking forward for the cold intake test.

[@gtorjoepontiac5136]

Dude speaks the gospel. ✔️💯🏁🇺🇸

[@roberthollinshead2325]

@David Vizard can you do a video explaining your roller camshaft smoothing process?

[@bcbloc02]

They make a lapping compound that is used in industrial gearboxes for break in. Supposedly the compound wears out so you run it drain it and refill it and are good to go. Perhaps a cheaper and easier option for what was done here.

[@richardscott8186]

Thank you. I have polished 4:10 waiting for mine. Always wondered if the polishing is worth it!

[@andrewslagle1974]

It is worth it !

[@herbslusher4409]

You had your "GAME FACE" on !

[@dondotterer24]

Now you got me thinking if I could do some rim finishing myself. With rolock disk and a buffing wheel. I'm just thinking about how you would do it knowing how you think. Thanks again for the great videos.

[@icepaddles141]

I gained 1 1/2 to 2 mpg by adding Molybdenum Disulfate to the transaxle on my 1987 Chrysler Lebaron 5 speed manual, 50 mile daily commute. Molybdenum Disulfide needs special additive for detergent oils so keep that in mind.

[@biastv1234]

Also used extensively in Australian motorsport .

[@hotrodray6802]

🔔😎🇺🇲 Thats not grumpy. Thats intense.👍👍😎

[@v.e.7236]

Micro-polishing has been used to great affect in valve spring tech, w/ NASCAR noting a significant increase in sustained top-end RPMs. I bought myself a large tumbler assembly to put my engine parts through prior to engine assembly. Gonna try a set of diff gears next.

[@justinwozniak2585]

excellent content

[@RetrocarStyle]

WOW at 14:25, Vizard looks just like Enzo Ferrari!🤣! Great Video BTW!

[@daledavies2334]

Traction Loc is an inexpensive option intended for street use. They have clutch packs between the side gears and the carrier housing. Torsen are definately better for circuit use and FWD.

[@andrewslagle1974]

Drag use that torsen diffs take a dump!watch out for drag use with that torsen unit.We use a spool or a detroit locker !

[@Faolan161]

A guy stumbling on his words is never speaking truthfully... And an honest man never blurts his honesty... The thief does both.

[@AdamOpheim]

May try the nitto 555r drag radial. they have a much better service life and wet handling than the MT drag radials. Worked great for me.

[@stevenbarnett2169]

If the new gear set runs cooler could you run a lighter oil?

[@lukesimeon5756]

Great info thanks DV

[@williamherring5441]

Thank you, DV! v/r wh

[@JeffKopis]

David, I remember an article in Hot Rod about 25-30 years ago, about a (similar, I believe) micropolishing service, called Micronite. They did all manner of gears, as well as cams and flat tappets. I know the finishes were SMOOTHER, but I dont recall if they were HARDER (as nitriding or hard chroming does). Also, Eagle has a surface finish called ESP for their cranks, which supposedly reduces friction. Do you have any info about that?

[@Anarchy-Is-Liberty]

Ceramic wheel bearings too! Also special coatings you can have put on your gears (rear/trans) that will free up more horsepower! I'm totally against "traction compound", give me good ol' rubber any day of the week!!

[@theblackhand6485]

These gear parts where walnut blasted? Bacci in Italy, don't they make the best gearbox parts for a Ford as well? Tires in the rain: at least Intermediates. A soft compound with grooves that is. But the rules on a strip could be different. Add a PTFA or similar additive to the engine and gearbox. It would help lowering friction. (...need to say: in the engine is actually not my favorite)

[@Hjfvvdst]

I would imagine oil pump gears distributor gears would be improved also.

[@gj91471]

Are You using Oil Extreme in the diff?

[@michaelhargarten5118]

I'll need to look more into REM finishing.

[@gj91471]

Also Microblue and WPC (wonder process control).

[@g0fvt]

Thank you for another fascinating video, looking at the differentials I have to wonder whether the Torsen gives you some advantage due to reduced windage within the differential housing?

[@georgedreisch2662]

Wonder what the track prep was, as I believe there are radial specific preps, and raise hell on high hp slick cars, for driveline shock.

[@UnityMotorSportsGarage]

I believe it was really too cold for the Radials. WAY faster cars were making it down the track. I will say with the gear change it makes the throttle like an on/off switch once the boost comes in.. Andy

[@Savineyard3]

I was wondering if you would test out lightweight brake rotors since your doing mods for this mustang to make it faster in the 1/4 mile. I'm sure you know this but purchasing a set of 2 piece lightweight brake rotors from Baer Eradispeed or any other reputable brands like Wilwood or Girodisc will reduce rotating mass by as much as little as 30 pounds to as much as 40 pounds depending on what size brakes the Ecoboost mustang came with, which should easily chop off another 10th or a little more in the 1/4 mile and will look killer behind those lightweight wheels too.

[@josephnubile1970]

Hello David, when will you be totally upgrading the stock intercooler with an aftermarket one, that should really help out.

[@clintonsmith9931]

If you want to test them, put them in an open half ton delivery van. Drive you crazy.

[@flinch622]

No, you are right: beautiful wheel choice. What are they?

[@danawilkes8322]

David. Have you thought of using a thinner oil in the differential? We have seen over the years that many manual transmissions have used a thinner oil successfully. If there is an oil that can handle the load requirements (similar specs for a manual transmission). Then this would take less horsepower to turn. Your thoughts would be appreciated.

[@bobbybelcher6800]

I can't wait to see that Mustang go 7.90"s A big inter cooler can help air density and temp. Are you running drag radials ?

[@michaelaustin7505]

So there is no gear as delivered, run it, then polish and rerun?

[@MasterKeyMagic]

Car Yoda

[@rolandtamaccio3285]

Of course you won't have time to get on the hub or wheel dyno with the wear polished 3.15 , then the 3.73 , with a temp probe in the rear , and show actual degrees F° , difference .

[@SeanOBryanZZ]

Does the gear ratio change affecting the power have to do with the gear face geometery and their levarage ratios? I've got a 3.55 torsen for my 260z it'll be 2500lbs 255-75 wide 26-28in tall rear tire that will be for my 340 build. I still have to check over the diff but now I think I while have to do a rim finish. I also have been looking at the ford oil cooler kit for the diff for the gt500 seems pretty easy to do. i'm glad the trans will play nice with the dyno for better data.

[@EnochAnnobil-u7w]

how about chroming the gears

[@freshkryp69]

Weve used Microblue for yrs... It lets the lubricant do its job, better.

[@gj91471]

Try WPC

[@garystillman2724]

HOW DID I NOT KNOW THIS??? 🤣🤣🤣🤣

[@rustywater3219]

Eaton Tru trac is a stronger gear diff. Go to strange s trac if you need stronger.

[@hotrodray6802]

I went Eaton TrueTrac on my 60s Ford. 👍👍👍 Aggressive, Like it.

[@mikkotoikka3188]

So is it needed if u properly drive gears in? Any data using 1xr..

[@michaelblacktree]

David Vizard, aka The Grumpy Racer 😛

[@rolandotillit2867]

That's a mid 12's car now.

[@rustywater3219]

how much did it cost to REM finish?

[@MotorSportsbr]

depending where you do it. costs 450 to 850 usd

[@crazywickedcustoms7272]

Nice looking car, but for the money cost of car and money and time out into it. Not very impressive. 20 years ago I had v6 Camaro, factory engine , yes , I balanced and Blue printed engine. It was an auto transmission little work on it , but everything else was stock , car ran 11:89 in Quarter mile. Got 26.5 miles per gallon highway. Daily driver. So , all that technology not impressive at all. But do love your KZbin and knowledge, sir

[@evanc6110]

What did you modify? How much did it weigh?

[@crazywickedcustoms7272]

@@evanc6110 ok, balance and blue printed engine, car weight was 2998, shift kit transmission, it was strip down model, light weight header light weight exhaust, cat deleted, modified injectors and by pass rpm so wound run full rpm, lighter rims. Change gears to 373. Easy, gad mileage was better then stock. I race cars in street, by book should have beaten it , vetts , bikes , mustangs. In the 1/8 and 1/4. I beat them. At track best Time 11.89. it was what we called back in day sleeper. Half the tech stuff on cars is slow down stuff I call it and big money to make fast. Lol, I am sold school street racer. We had tricks ,that the best in the industry still can't figure out. Useable hp, on street my v6 Camaro was faster then the track time

[@crazywickedcustoms7272]

Car weight at end was 2,898. Plane strip , down v6 2003 Camaro. Light cars to start weight 2998. After just Little things lost 100 to 200 pounds. Base hp was 200 after what I done 350hp in a 2,800 pound car, more or less , equal fast. Daily driver car

[@evanc6110]

Cam? Headwork? Intake? Stock bottom end and stock compression? @@crazywickedcustoms7272