My 3 Rotor transmission broke. It probably saved my life

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[@BigMoneyWaste]

The leeroy Jenkins reference made me laugh so hard before it was even explained😂😂

[@ethanlockley]

Hahaha, wanted to come here to say this. Beat me to it. What a great reference IMO.

[@housearea]

Leeroy was 15 years ago wow hahahah😂😂😂

[@kotajames6211]

I'm waiting for this right here 😂

[@ctskifreaks]

Leeeeeeeroyyyyyyyyyy Jenkinsssssssss

[@saltycanadian6190]

I went back and rewatched the clip of him getting everyone in his raid killed.

[@import702]

Rob please read! Quite a few guys in the drift scene have tried those tie rod adapters to solve the same issues. Many have had failure due to it. I’d highly advice against it for safety especially in a half mile + car….

[@shlomoeini]

I came here looking for this comment. Also was hoping he might reverse engineer it with stronger metals.

[@yamondakawazuki8941]

Bump

[@mcullennz]

Bump

[@Gamyrc]

Hopefully he gets to this 🤞👍

[@mcullennz]

I copied the OP comment and tagged him on twitter

[@joealex65]

Grannas Racing: **Builds one of the strongest manual transmissions you can buy** Rob Dahm: *"I took that personally and blew it up"* 😂

[@wbass243]

eEven more amazing: They are using Isaiah's Flesh Light to hold open the hood of the 4 rotor @ 3:19

[@Omnis2]

@@wbass243 This comment shouldn't be hidden in the replies 🤣🤣

[@joetambasco1904]

I got the Leroy joke immediately man. No worries. For the horde!!

[@waybous]

Rob, the HANS device straps need to be tightened more. You should only have about 3° of movement. With the way they are now it can still cause neck injury.

[@kwisin1337]

Very good Information.

[@senorspahrtan]

1 HOUR OF DAHM!?! MY PRAYERS HAVE BEEN ANSWERED!

[@user-kd4dr4rh5n]

2 min in and already a lot of comments, I aint the first on this one

[@CD-vp1oz]

Who can even last this long? 😩😩

[@Kenji1685]

His cabling video was long too. 🙂

[@hooliganracing5110]

When I saw you take the rear wing completely off, all I could think about is seeing rear wing failures in F1 and how quickly the rear of the car spins because it's pivoting around the nose. I know you aren't dealing with that much down force but I think you might want to look at that along with the rear sidewalls like you mentioned. It's amazing watching you guys doing this from a grass roots level. Keep up the great content and good luck on your goals.

[@huck69]

I know your plate is about as full as it can get, but I'd love to see the 3 rotor get a roll cage, if you plan on continuing with the half mile stuff in that car. much love daddy dahm

[@dadadadankable]

Wish we could all blow his dm's up with the clip of that red volvo that wrecked during sick week. Without the cage that dude wouldn't be here. Or any clip really of when a cage saved the drivers life. I don't want to see on Life of Palos that Dahm died because of no cage...

[@jacobsidorov]

Absolutely. I agree

[@loknload2137]

I agree

[@Galf506]

Honestly Dahm is too old for the kind of risky sht he's pulling, it's not just the cage, but the test pulls on a public road crowded with vehicles... "car has bad side by side stability" yes let's bring that on a public road. No idea if he even lives out of that if he hits an SUV given how low is the car, but the huuuge risk of killing innocents? That is insane

[@aserta]

This. No car with that amount of power should be uncaged. It's just waiting for bad stuff to happen.

[@garygreen90]

Hey Rob just on the BMW diff running backwards, generally the consequence of running a diff backwards is that the drive end bearing of the pinion gear will not get adequate cooling and lubrication. In normal operation the crown gear “pumps” the oil over the top and throws it at the front bearing. Just something to keep in mind.

[@ldnwholesale8552]

A rear axle is for the back of the car. Running it backwards has the ringear trying to climb out of mesh. 100% wrong,,, just like the rest of the car. And the drag caused is huge. And he waffles about straight cut quickchange gears. As for weight?? Simply scrap all the front drive setup and make it 2wd!

[@joealex65]

@@ldnwholesale8552 If you are seriously suggesting to make the 4 Rotor RWD you're COMPLETELY missing the whole f*cking point of that car! Sometimes i just wonder if people think before they pull dumb sh*t out of their a**...

[@aserta]

@@ldnwholesale8552 You're exaggerating, it can't go out of its frame of reference, it doesn't care where it is or what it does. It's perfectly usable, like the rest of the car, which works. Ya'll negative Nancy need to get a different job, like putin-cheerleader or some shit more aligned with your mentality.

[@bearleemadeit4718]

@@ldnwholesale8552 He’s also putting only a fraction of the torque that would normally be 100% through the diff normally so I’m pretty sure it will be fine. If is hasn’t broke yet with his hard launches(which did break his CF driveshafts), then I’m sure it will be fine. Also quit bashing Rob and go build your own…… His channel is awesome, his crew is awesome, and his cars are awesome.

[@ottigreenisgo]

But the diff is also facing backwards so the oil is being pulled to the pinion gear and bearing under g’s

[@Legotruck82]

I appreciated the Leeroy Jenkins reference, even if the guys at the shop didn't

[@WoWanMinecraftPlaya]

2:23 ALRIGHT TIMES UP LETS DO THIS

[@ascorbic123]

I think you need to keep that wing on, or at least have some sort of ducktail. I'm no genius but having a huge front bias of downforce with barely anything at the rear is going to make the car naturally pointy and unstable. Even if you just have the rear wing at a really low angle of attack, it should be much safer at those high speeds.

[@dertmatyui]

From the way I see it, the car needs a bigger wing, a much bigger wing

[@alondjeckto]

@@dertmatyui car needs actual aero package. Not the bigger wing.

[@K31TH3R]

Vertical stabilizer could be the best of both worlds, keep the front downforce but gain lateral stability with minimal added drag. I'd also be wondering if the huge lateral forces on the rear suspension/driveline from the instability at speed is contributing to stress on the transmission. If the driveline is already on solid bushings (not sure) then that transmission is moving and jumping around in the trans tunnel a LOT more than I'd be happy with, you can actually see the driveline vibrations start intensifying during high lateral load when the car starts to sway, which might be an indicator for driveline binding because the chassis isn't stiffened enough.

[@Blockbuster2033]

Yeah, taking off the wing was a really stupid decision. I cried out loud when they did. Especially when he pointed out that they added the splitter and stuff. I've been a long time advocate of consulting a professional aerodynamicist on this channel, but eh, what do I know.

[@rotaryperfection]

Yep thats good old fashioned bumpsteer with those aftermarket 20b subframes that lower the rack. The only true way to not have this is to move the engine back and re-engineer the stock frame. That's what I did to my car but it's a shit load of work because you have to a make custom lower intake manifold, move the transmission back, relocate the shifter and shorten the drive shaft. At the end it's worth it because the car feels stock while driving plus you have better than factory weight distribution and polar moment with the 20b sitting even lower than the stock 13brew.

[@JB-sv5pr]

Sounds cherry you still got a rx7 ?

[@rotaryperfection]

@@JB-sv5pr Yep! My baby ain't going no where.

[@Alex-wb2yw]

The 3 rotor deservers a makeover, man. It's time.

[@halofreak1990]

or at least get it wrapped like the 4 rotor

[@Frank_Serota]

I think keeping the wing on while u run the splitter would help keep the car stable. Major aero imbalance having downforce in the front and practically nothing on the rear that also weighs nothing. it doesn't need to be at a crazy angle but anything helps

[@Gearbhall]

Rob, if it makes you feel better I spit out my drink on the Leroy Jenkins joke.

[@surisouris]

Hi Rob, best for you would be contacting the KZbinr Phillipp Kaess. His companz is arlows. He is from Germany, had made videos about a company that produces billet housings for BMW differentials. For sure he has an address for you and can help you.

[@SamSayaz]

There is so much free advice and knowledge in your comments and I love it so much. Keep doing what you're doing Rob and stay safe, listen to these smart ppl in the comments!

[@SideQuestGarage321]

AntiGravity needs to sponsor that van to support the amount of time it spends with the alarm going off when Rob's around.

[@masdto]

rob's timeline is more confusing than someone who starts watching marvel movies in 2050😂😂😂😂

[@Martin.ac.85]

YES! An hour long video! Thanks man, love your content.

[@edwardhoulihan4917]

The Leroy Jenkins "repeating of course" killed me. Thanks for the laugh rob.

[@06zoomzoom6]

44:17 "that sunroof will leak" completely ignored that it's missing the whole back glass😂

[@Tclans]

Whahahha that ‘whooosh’ with the Leroy Jenkins reference was absolutely gigantic and hilarious at the same time!

[@AzureCrux]

Rob: Repeating of course Shop: What the hell are you talking about? Rob: At least I have chicken

[@Alex-wb2yw]

Put in as much caster as you can as well. That will help with stability at speed. A stock fd should be able to run around 8-9 degrees, but you might get some rubbing depending on your front tire size. I was running like 8.5 degrees and rubbed slightly when turning on a 255/40/17. Without fender liners you shouldn't rub at all though.

[@seanleahy3376]

I love how you take a more physics-based approach to a lot of the work you do instead of just slapping stuff together and not really understanding whats going on

[@PlainColors]

Daddy Dahm dropping an hour long banger❤

[@ICKY427]

1:00:32 you mention coasting down leaving it in gear is bad for a rotary. ive never heard that id be interested to know whats going on there. ive always noticed when you do a pull you immediately clutch in and idle instead of just leaving it in gear, even around a circuit. i never thought there was a particular reason for it

[@maxwelltollefson9947]

Rotarys derive some of their lubrication from the fuel. If you’re coasting it typically will cut the fuel so there will be no lubrication to the seals.

[@ICKY427]

@@maxwelltollefson9947 makes sense. i wonder if you dump some fuel when throttle is closed, more so if rpm is higher. not sure if that would work. i assume if it did he'd be doing it

[@maxwelltollefson9947]

@@ICKY427 I think that would probably foul up the plugs since your basically running at an ultra rich condition then. The best thing to do is to just let it idle since you have lubrication and still oil flow through the turbo.

[@vUNiTED]

It would be bad ass to see rob go to a cars n coffee type of meet with the 4 rotor to get reactions of older folks 😂

[@JasonEsquivel]

Thanks again for coming out to my small town. Was a pleasure having y'all out here.

[@lucaspetty6500]

Hey Rob, I’ve been watching since day one for the 4rotor build. I gotta say I’m very proud of the progress you’ve made. I’m from Tecumseh, and I love watching a Lenawee county citizen excel from the little town we’re from! Keep up the good work brother! 👍

[@AyrtonMcNamee-zq1ot]

Thanks Rob, Isaiah and Joel for providing great videos everytime. You provide so much stress relief

[@Bubbaj226]

I got the Leroy Jenkins reference!

[@pasi2305]

Ohh that sweeet turbo with cute rotary attached to it. This Rob's channel is so good and motivating in so meny levels. From getting old/bold and all this car-candy stuff all every 25-55yo men need for our everyday life.

[@paulsoileau1850]

Lol I never thought I would ever hear someone else quote the Leroy Jenkins KZbin video. I use to say that all the time at school back in the day. You never cease to amaze me Rob.

[@willsweet5482]

Rob, i think you need to do some CFD analysis on that wing. The angle you have it at is very steep and angle ≠ downforce. There is a sweet spot and the drastic reduction im MPG on your truck you were mentioning suggests the wing could be stalling. Creating minimal downforce and large drag

[@kcdesignconcepts5216]

Love watching your videos and the way you go about solving problems on your cars. Bump steer usually is a problem with a lowered car if not corrected. The angle of the tie rods are part of the problem. The other problem is changing the angle of the control arms.

[@josephmarrero5373]

Got to love this guy,, being Puerto Rican I grew up listening to these cars day and night.

[@TheKiltedYaksman1]

You could always put in an electric vacuum pump for the brake booster, and just not worry about check valves or manifold vacuum...

[@sagittnet2158]

Life is too precious man, hope you have a jackstand while your'e under there. My coworker friend father recently lost his life coz he was too lazy to use a jack stand.

[@Hugh.Gilbert]

"The 3 rotor will be tomorrow's video" 10 days later... Roba has different length days to the rest of the world

[@vurblz]

21:49 was the most euphoric thing I've ever heard. Literally felt like I was in a different realm.

[@Da5idc]

Quick suggestion - if you want to look at your laptop when driving, then make a mount so you can see it without without having to look at the seat

[@Galf506]

or even better: don't... it's stupidly risky AND it's a public road. Honestly surprised the police isn't just placing a patrol car there at this point, it's a murder waiting to happen. I love Rob but this can't really fly anymore.

[@deimosphob]

Should definitely individualy fuse the coils on all the cars. Maybe add a junction box for them that goes back to the 30 amp fuse, hopefully save you 80 bucks

[@JoshuaRosaaen]

Lessons seemed to have been learned...this is the way. I love that you share this stuff. Thanks

[@teabee44]

Can't wait for 12 rotor build

[@drantman]

Been dreaming of that 12 rotor for years!

[@commonsense7754]

Safety needs to be much higher priority with the speed and dangers involved with home built cars.

[@MrTwoZZT]

The guys not getting the Leeroy Jenkins reference makes me feel sad, and old.

[@supersploder8130]

The fact that you push so much power out of these engines and the most damage I see as a title say is, "I broke my transmission." Really a testement to how rock solid you build your motors Rob!

[@stevekissel605]

Glad to see u finally get a Hans. Great video 👍 👍

[@yasha1928]

I had those exact tie rods on my drift car for 3+ years with no issues, I thought that it was neat to see ! Keep doin' whatcha do Mr. Dahm! 49:50 ish, you talk about a check valve, you could also get an elec vacuum pump!

[@deltacharlieecho4732]

I know it's something I say often, but it's always nice to see top tier guys using Harbor Freight stuff like us amateur builders.

[@zachniedfeldt]

He still uses a harbor freight low-pro jack. As do most car u tubers. I do appreciate it as well

[@edtank22]

The Leroy Jenkins quote was top notch

[@AlteredCarbons]

49:00 dawg, every time you shift that you look like you are about to gite your bottom lip off and it has me rolling.

[@Soravia]

When your clubs no slip, tires have no slip, something has to give. Remember how Pontiac GTO 6.0L broke shafts to rear wheels after tires were upgraded? How GTR 35 broke transmission on launch? Solution is to calculate the max sudden torque power limit and set up half shafts to break before anything else. They are the least expensive part in your setup, and less likely to directly hit you when broken under torque.

[@menamebepinchy]

I understood and loved the Leeroy Jenkins reference.

[@YungAntoine]

Rob doesn't always upload every other day or every week, but when he does upload a video its always like 30mins - 1hr.

[@webb2800]

Love how even with all the issues the 3 rotor still slapped that Mustang (?) Next to it

[@Alex-wb2yw]

I imagine Isaiah's bedroom has one of those tie dye 'tree of life' tapestries on the wall, Christmas lights, messages and drawings from his friends on the wall by his bed, a few dream catchers, and a bong on the night stand.

[@jok3yjesu339]

Right when you said "repeating of course" I knew exactly what you were gonna say😂

[@kingclutchxyt]

Take a lookin into militec-1. Anti friction additive. You can put it in trans and differentials as well. I really have noticed a difference in 900whp c5 corvette. I would love for you to check it out and give me your thoughts.

[@LUCKIPUP]

is it similar to dyna lube? it generally fits the same purpose and goes anywhere in the car with metal on metal contact and is meant to keep oil adhered onto the pores of the metal in your engine/transmission/power steering

[@kingclutchxyt]

@@LUCKIPUP I'm not sure I just started digging deep into these anti-wear additives and I'm using militec-1 as we speak. The other ones I've seen are turbomax and nmf

[@zakikahl6904]

The silicon is a normal thing for that kind of diff. Keeps oil from leaking through the splines

[@charlesgraham9954]

i have my grandmother 66 Chevelle she bought brand new, i re did it in the mid 90s, my son and i put an LS in it with about 500 blown HP when i re painted it in 2017, that is plenty of HP for city streets. very fun and very reliable. what is most shocking to me is, how little u have to do and how cheap it is to get 500 HP out of an LS. the beating they can take is shocking as well. engine tech in the last 20 years is off the charts.

[@jhwgshs1394]

Rob hear me out, rotary Honda civic if anyone could make it happen it’s you. You’re brilliant with anything that involves engineering.

[@mackenziecrawford8503]

When I’m torquing the bolts on a ring gear I use a large strap style filter wrench on the case to counter hold the diff. It can be annoying getting someone to hold the diff still for you or one hand it haha

[@lovelldreams2498]

it amazes me we haven't seen this man get pulled over ONCE doings this wild shit on the streets lmaoo

[@slightly_hyped]

now that i’ve been watching these with headphones on, i’m realizing the audio levels are in fact all over the place. can you mic yourselves so it’s easier to listen to?

[@joseacuna3239]

Rob man-handling the shifts in the 3 rotor while biting his lip is the most sexy yet manly thing you’ll see today. 😂

[@LifeInTheDM]

Rotor looks cracked buddy. Driver front. The rust line in the outer most hole. 🤘🏽🏎

[@AndrewDate]

Omar at Raceonly is the man, he remote tuned my car and it takes a serious beating with no issues!

[@shujais]

Rob, please please please hire an interiors guy to do all of your cars and make a series out of it. This would get so many views.

[@MichaelS-dt4lc]

The 4 rotor screams like a banshee with the big turbo, I love it

[@AP-op4rc]

Crazy how far tire technology has come. The right tire and you could have been straight as an arrow. The wrong tire and it looked like the 3 rotor was trying to twerk at 160 or whatever. Good for you seeing the positive in the breakdown, Rob. A broken shift linkage and a blown clutch or even blown trans is much better than a rolled car or a broken Rob… glad you and the car are in one piece dude.

[@peterboyer361]

The crown gear for the diff. You need a oven and heat slightly makes it easier to fit

[@michaellongford871]

Rotary legend Rob Dahm you are calculating all the science make it easy for rotary guys bigup to guys like you and Vargas brothers big respect 🤛🏿# keeping rotary's alive# Doritos

[@DrRodion]

“Calculating all the science” 😅 dumb af

[@ForeverNeverwhere1]

Try some punctuation please.

[@johngreen4th891]

Rob started talking about ratios and I got ratio'd... Also LEROY JENKINS!!! 9:12

[@zizn8r]

as a heads up, while not "required" it is a good idea when changing the 3rd member gears to also check the overlap pattern mesh between the gears. lash is only part of the equation when shimming everything, the pattern of mesh needs to also be centered and even in the gears. It'll also give you a good indication if the ring isn't sitting perfectly flat when the pattern changes around the circumference. spray some yellow paint or use dykem and roll the gears around once installed and look at where it was worn away.

[@NaClSandwich]

Nailed the live part of live and learn - that's the most important part!

[@LostFart]

44:41 I really find it fascinating how the IDLE RPM for these cars the is the same as the MAX RPM for a lot of commercial trucks XD

[@daneprostamo-brown6552]

Rob ya really should be checking gear mesh pattern with dye to know if the diffs are set up correctly. Without this you are pissing in the wind with setup and if it’s not right you might be loading the weakest part of the crown wheel which could end in disaster if your loading it with heaps of torque

[@jtrarden1928]

Rob did you ever pattern either gearset? Not seeing you adjust pinion depth one whole step missing there.

[@michaelh.1262]

!

[@bryanduggan]

Or setting pinion preload (which didn't look adequate) with an impact wrench, but when it fails, it will be the torque that killed it.

[@d3ltaezrael688]

every time i want to go to bed early rob dahm drops a video

[@randalanderson4722]

I just started and people haven't even finished since this released, epic video Papi Dahm!

[@Berm_Blaster]

The 3-rotor running the half mile was the first video of Dahms I ever watched. Some three or four years ago, crazy.

[@madscientistlife]

Friends don't let friends get under cars on jacks. A jack is a lifting device, not a holding device. USE JACKSTANDS! I don't want any of you guys to get hurt or killed. Please be careful. Cool cars cool show. Keep up the good work. God bless.

[@owixomen]

"better then our normal odds" i got you rob

[@darthnosam3313]

We have to use hans devices for offroad racing. They are extremely uncomfortable. They make velcro paddings that fit under. Make sure your fire suit collar is tall enough. Or else the edge of the hans device digs into your skin. I got a burn from it rubbing on my neck for a few hours. They are also very unconfortable to take off.

[@onevwnut]

I love seeing you use the carbon tubing for SOMETHING 5:28

[@filipecamargo69]

that brake rotor of the 3 rotor is is all cracked haha... thank you for one our of absolute pleasure

[@Redemptioner1]

Spinning the gear backwards is 1/3rd strength reduction, so all the trees.... the crush washer on the pinion adds the preload for the conical bearing.

[@MikeP1zzle]

Congratulations on your great success. Very Nice1!

[@171apples171]

My God 6:04 that idle sounds so close to my 81' KZ1000 with a Kerker on it lol I just wish my revs sounded as insane. That's one hell of a car right there.

[@marinaportocaribe]

Im a rotary full time technician been working on rotary engines and marine stuff for 20 years and I guaranteed that 90% of rob ideas are wrong but it’s entertaining reminds me when I was starting. I just hope nobody take his words as reference for something important please don’t do it

[@Morscode_Gaming]

Oh and thanks Rob for the FC gold I went straight out and got a g40-900 and it's so happy on my street car in that low boost range 👌🙏 My mates here havnt wrapped their heads around the science and still run the older gtx series turbos. I win haha

[@AyeSupQT]

LOL the Leeroy thing was great bro

[@golfy808]

Awesome you are in contact with Aussie rotary builders.. I like Omar... how did u get onto him Rob ??

[@TheHungrySlug]

I'm not sure if anyone has mentioned this, but, you could buy an alternator that has a vacuum pump attached to the back of it. Common for turbo diesel engines to have a vacuum pump on the alternator because of the lack of vacuum on the intake, due to boost. Then you at least have a dedicated brake booster vacuum pump.

[@danieljames5875]

On a ford rear you need to crush the pinion with the nut until you have 15-28 in/lbs of rotating resistance. Around 225-275 ft/lbs

[@treewisemenllc7281]

You see it through the right scope, Rob. I'm glad you're alright, an glad you caught the tire issue. The shift issue is prolly just a bound up linkage. 🤘🤘🤘