Rotary Corvette made so much power we started blowing off vacuum lines

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[@ryushi5]

Hey Rob, I deal with those air fittings and hoses all day at work. While it can be a bad fitting, 90% of the time it's the way that the end of the hose is trimmed. Get a razor blade and make sure that the end of the hose is perfectly cut and smooth. That can save you some troubleshooting headaches down the road.

[@colecollett9517]

I have had similar issues too, took me ages to figure it out! Hopefully Rob sees this

[@BeardMan01]

Also, it's good practice to put a small zip tie in the release collar to prevent it from releasing. They make lock clips that fit in them as well

[@funkalicious2002]

I recommend getting a cutter. For smaller vacuum lines you could use a cutter for trimming 3d printer bowden tubes, and it'll make a good, straight cut.

[@liamthehippy]

the HGV industry use these fittings absolutely everywhere, i think they're brilliant!

[@bocarrell7881]

Hope Rob sees this

[@nochan99]

Dude imagine I might be able to help you with something! I worked with those pesky quick-connectors for many years and learned a trick or two from the pros; 1. you need a special tool to cut the tube straight and without squishing it at all. If the tube is not cut straight or is ovaled in the cross-section it will NOT seal properly and/or may not hold pressure (i.e. fall out) 2. Push the locking ring all the way open before inserting the tube or else the teeth will scratch the tube going in, wearing it down. A worn tube will not stay put 3. After you insert the tube until it bottoms out pull the locking ring all the way closed. If you don't, it will definitely NOT stay put. 4. Maybe the most important part (which I saw you were missing) there is a clip that you place behind the locking ring, it looks like a plastic C-clip that is there to make sure the locking ring does not budge. I can't tell you how many leaks and problems we had due to those missing over the years! 5. Once everything is in place, do NOT let the tube move/rotate! If you have too long tubes that dangle it WILL wear inside the connector and it WILL start failing! When it fails the only way to fix it i to start over by cutting of the worn part of the tube, starting from step 1. Good luck!

[@xijinpingpong4426]

push

[@gordowg1wg145]

Excellent comments there! 😎👍 The only thing I can add is that when assembling the fittings, with the hoses pushed right in one should use a marker to mark the fully in position - that way if it starts coming out ther will be space between the fitting and the mark on the hose. Doesn't help if it's damaged hose leaking, but if there'sa gap, ther IS a problem that needs addressing, even if it isn't the actual problem being chased down.

[@socks2441]

we use that same fitting at work for manometers, we only use them to read pressures of about 3 psi. i certainly wouldnt trust these connectors on something as important as this car, or for 30psi. edit: actually come to think of it we have a few machines that use these fittings connected directly to the main compressor line, which is at about 100 psi.. i dont understand how a long length of that tubing or that connector seal with that much pressure but they seem to.

[@diji5071]

It's so nice when comment sections become a resource for the OP

[@gordowg1wg145]

@@socks2441 They're a standard fitting in industrial machinery that uses compressed air, but there may be a difference in the quality of the fittings and hoses/lines, as Rob suggested - oh, and the quality of the fitter 😉🤣 Oh, forgot in the earlier post, but while 3/8" and 10mm may seem close enough, ~ 0.5mm/0.020", there's just that little bit of compromise in the effectiveness of the gripping mechanisms if the wrong size(s) are used.

[@Boostedm3nace]

California - “No mods! Not even a cold air intake!” The Dahminator - Builds a fire breathing rotary swapped c5 😂

[@Matty.Hill_87]

It's only illegal if he gets caught 😂

[@bakedandsteaked]

Commiefornia

[@rahenry00]

@@bakedandsteaked how so?

[@gordowg1wg145]

@@rahenry00 It's what the stupids say who don't understand why they can't do whatever they want to do. I don't agree with all of what the CARB and EPA are doing, but I understand why they're doing it - ask your parents or grandparents about the pollution in the sixties and early seventies.

[@rahenry00]

@@gordowg1wg145 I was referring to the "commiefirnia" statement.

[@caseymiddleton6878]

I love that your making it as “OEM” as possible lol shit looks funny as hell speeding past with rotary noises 😂😂😂

[@TheRealBhuado]

Rob is literally the ONLY person to show you where the issue was and how they diagnosed it. HUGE thumbs up for this.

[@jonahfastre]

It’s good practice to put a little mark, with a sharpie or something, on those little hoses that can come loose, so you have a visual indication of when it happens

[@xSupra]

Ye that's what I thought too, but that won't stop the hoses from getting out again.

[@ksan351]

Calling it now, this vs that. Rotary vette vs ls Rx7.

[@Matty.Hill_87]

We need to see this

[@Oatmealism]

Do you remember when this car was just a situation of 'I want to Rotary to make as much power as the stock LS that was in it'? I do, Not that I am complaining this car is getting the chance to stretch its legs and actually put the power down is really interesting to see how far it can go.

[@craigbarrett2278]

It's what started the Dahm experience for most of us.....😊

[@joshuafleckenstein351]

The laugh after “Do Re Mi Fa- Dyno” was hysterical lol

[@mattmannino3674]

I was dying

[@VincentParisien]

Paul Walker must have turned in his grave as Rob passed that Semi while tuning his Rotary Corvette on his laptop... All that was missing was a Japanese motorcycle street gang looking for their 10 second car... Love your videos Rob! You're such an inspiration. Keep it up!

[@yasha1928]

Ps. Go into second gear 1st and then go to 1st gear, stops the trans rotational mass and should prevent your grinding synchro lol

[@bigcountry908]

Only whilst downshifting

[@yasha1928]

@cole wenger no, definitely works during stop and go traffic as well.

[@jsomething2]

that will help, or you know.. just put new blocking rings in the tranny? it's not has hard as any of the other shit they do. could also get a zo6 tranny with the shorter gears. will help some since they don't seem to want to do rear gears.

[@isocuda]

That's the kind of failure that cost Toyota the LM24 a few years back. Questions like "why are we using a $20 fitting on this little thing?" can be replied with how much the hourly dyno rate is, fuel, staff costs, or even a race victory. But this is the fun part of the puzzle that is making cars do silly things :D

[@Cjbarker2]

Those air fittings have to be cut perfectly straight. There is a cutting tool that makes it easier, but I prefer compression fittings to quick connects every day that ends in “y.” Quick connects are great for stuff that needs maintenance, but if it’s imperative that it doesn’t leak, I’ve never had an issue with a compression fitting.

[@coltonmcrae5873]

As someone that works on air brakes daily, 100%. Compression are a bitch to deal with, but they never fail

[@962RACER]

A shorter rear end would make the t56 a pretty well suiting short ratio tranny in 1st through 5th gears for this powerplant. It being domestic it shouldn't be ridiculously expensive either.

[@ClarkBark14]

Food for thought. You do have the capability of machining cap off plugs for turbos/intake pipes that you can tap and plug an air chuck to for boost leak tests. Spray around with a soapy bottle instead of risking engine harm.

[@Cjbarker2]

The turbo inlet is a boost leak if the engine isn’t running. Unless you’re telling him to cap off the turbo inlet, there’s no real benefit to that. However, that’s not a terrible idea

[@ClarkBark14]

@@Cjbarker2 I normally pressurize the system at the charge pipe where it connects to the turbo. Depending on how your valves/rotors whatever are clocked, air will get through unless you plugged the exhaust, but that's not really necessary. If you have large shop air system, you can just crank a regulator up enough for the system to be pressurized despite what creeps through the engine.

[@bendermender926]

this is the only man on yt to show all the steps of how easy it is to make power with a rotary. hopefully his diligent documentation can help future owners like me squash issues before they end up turning disastrous

[@Jlow67WV]

As others have said, use a razor blade/tubing cutter to cut that tubing. Also, use nylon tubing or DOT certified type A/B. Those will support higher pressures at higher temps.

[@hugojeller]

i need a shirt with "do re mi fa so la dyno" now

[@crts1683]

The fact that you have this SO dialed in is MENTAL, amazing car.

[@monke4632]

He’s truly a mad scientist.

[@j1mmys4ndusky]

Bought a 99 FRC Corvette in black today. Seeing Daddy Dahms makes me wanna put blue stripes on it as tribute 🙏

[@tkskagen]

"This Shirt is my Good Luck Charm..." as You Grind the Gears... HILLARIOUS!

[@dannythompson1948]

Nothing more satisfying that listening to the progress of a car's tuning tightening up... Ahhhh

[@monke4632]

Let’s not forget to like his videos guys, let’s help in any way we can to help fund more videos!

[@ProfessorLX]

I never thought I'd see Riff Raff in a Rob Dahm video. Amazing.

[@JudgeDreddz]

I see the black coupler on the intercooler pipe spinning it’s the drivers side one

[@mr.k6136]

I've no idea why I but the MTV Riff Raff reference made me totally lose it that was one of the most random things Rob has ever put in a video

[@klitorusrhex8354]

You could go to a hardware store and get compression fittings for those lines. Look where they sell the refrigerator or dishwasher water supply lines 😉

[@JohnySv]

8:18 I think that's the best "hehehe" we got from daddy Dahm so far...

[@GW2_Live]

That is why I don't like push-lock fittings, AN -4 vacuum lines only for me! Way overkill I know, but I never have vacuum/boost problems

[@SeishukuS12]

Dyno coming to a stop and squeaks, kills me every time. 😂

[@Coombsly]

Hi rob, noticed in your video the charge pipe moving a serious amount. I know the joints are designed to allow flex but surely best to bracket that pipe to stop wear and tear. Top work tho, love watching your videos.

[@limitlessbuilds]

Got to start doing hard lines on your projects! Great problem to have. Haha

[@briankuhn7396]

17:11 OK. That got me! 😂

[@DEADPEDAL]

I think you had just purchased this car when Freddy and I were there in 2019. Glad you stuck with it. I absolutely love this thing.

[@venge1894]

This was the car that really got me watching this channel. Its just such a clean engine transplant, and its nice to see some 2-rotor love after all the three and four rotor content.

[@Barton_Motors_Ltd]

You need your own dyno someday rob. Would take your whole business to the next level. All in house baby

[@Aradinx2]

Rob you need to start posting some 60-130mph pulls after you get your cars done so we can get a sense of how fast they actually are.

[@jaredrule1431]

Love everything you do Rob. One of my top KZbin channels to follow. Only one piece of constructive criticism, pleeez add a resonator, change a muffler, do something to the exhaust on the Corvette! Apart from that, love your work. Keep it up.

[@robbertburger9381]

damn Still AWD 4 rotor Waiting room, since Hoonicorn VS world is back i'm hoping on a Rematch :D

[@Tbd_racing]

I love these videos so much! Every time I watch one of your videos it gives me more and more ideas as to what I want to do with my cars.

[@under_wraps]

Let me wrap the vette for you!!! Like this so he sees it

[@adamhallwood5768]

The chuckle at 8:18 and 13:52 is fantastic

[@hosh710]

hahahaha

[@rbmwiv]

The shape of the car and the sound of the Rotary it’s like looking at a RX7.

[@max-eo9iq]

lol yeah looks like an rx7 from an alternative timeline

[@mhammadalloush5104]

It looks like if the GM Aerovette engine made it into a Corvette.

[@emanh4keem_san420]

The RX7 from another universe Dahmniverse

[@dublobe]

The laugh/chuckle after "do re mi fa so la dyno" is funny 😄 n he knows it

[@NovaRedHead]

9:42 that engine bay sound is like music through headphones 🔊🤩

[@austinclifford4511]

I think you really need to go something about that exhaust. The drone is lethal...

[@RobMcFlash]

I work with festool fitting like the ones you have problems with. I use them up to 8bars (~116psi) of pressure, absolutely no problems with leaks.

[@BlueDually4x4]

Those push lock fittings should hold up to 125-130 psi as semi trucks use them in their air brake system, but they are finicky little shits and if the cut on the hose or the hose isn't perfect, they will leak. Still enjoy seeing the progress you are making in every video on your projects. By the time you get the little bugs worked out you are going to have some wicked rides.

[@Sauerbrew777]

Isaiah needs a shirt that says "This is what peak performance looks like" with a picture of his RX-8 doing a burnout!

[@Matty.Hill_87]

I'd buy that

[@davidlara3277]

Rob, damn it I've always hated those quick coupling vinyl air tube joints. Come on Robbie baby!!!!LOL

[@dirk_diggler320]

Dahm plate and parks in the red........ well at leased you have learned how to tune and build Rob !!! lol nice work brother !

[@mathiasmorell5094]

Other KZbinr Dyno car, okay so we had a little problem (cuts the clip until sometime in the future ready for new dyno claim they fixed it) but refuse to tell what happened or how long it actually took to fix... Then there is Rob. 👍 Mad respect for showing all aspects.

[@marvinzimmermann1678]

I love how rob is tuning his cars himself. Not like other dudes. No front at them cause not everyone can programm. Just want to say

[@demonic477]

I know it's counter intuitive to racing but if you have a gear too tall for the engine the trick is to run a heavy flywheel . it will keep the inertia of the engine revving when it gets a load on it like with a tall gear and push thru to get the car moving and once it's going it will help keep it moving the only down side is the engine winds down slower then with a light flywheel. it's the same reason the old battle boat cars with 6 cylinder engines had massive flywheels it's cheap and it works very well

[@lmartinzr1]

I hope to see more of this car 🤌

[@pahlsun216]

*check engine light on* Rob Dahm: "This little light of mine, I'm gonna let it shine"

[@BaseSRKI]

Very cool video once again. Shows clearly the reality of life, videos, everything I’d want a kid to know from KZbin: IT IS NOT EASY! Great journey to witness, thanks!

[@fauxque5057]

The trick to those fittings is to bottom out the hose and then you have to pull back. Pulling back locks it in and seals it. 23 years of production maintenance I have installed, or changed out thousands of those.

[@anthonyciccariello8089]

3:17 you should make one of those gated shifter plates like in your Lamborghini.

[@andivatar6383]

Cant believe you still hadn't changed that exhaust. I thought you can't resist that sound.

[@hardwurkindaddy]

"Do Re Mi Fa So La Dyno" should definitely be on a shirt.

[@Jumpingmeatloaf]

Use nut and ferrules, lines will tear before this style of fitting leaks.

[@HalferLandPerformance]

We specialize in Honda Jseries V6 engines and do care about power per psi of boost. Our 06' Accord 6spd coupe J35 custom turbo setup on a 6968 Journal bearing Turbinetics turbo gained 35whp per 1psi which is INSANE. Good rule of thumb is a healthy setup will gain 20ish whp...ours did 35whp 😎 We have a Dyno video on our page

[@yutub561]

Get some swagelok fittings for your Mac valve. Best of the best

[@peni80085]

New video from Rob -> instant 👍

[@ericfeldkamp3788]

Nothing ages more than car interiors do .... 80s super cars. 90s cars. The changes in our expectations for what a decent interior look like have advanced at a tremendous rate.

[@CrunchyMaggots]

I love that the auto-generated caption system labelled the revs at 8:05 as [Music] ... Correctly.

[@alex.garrett]

so rad to em that your biggest problem is hoses! hard lines would be the obvious choice to me, excited to see where you take this!

[@big-R]

Bruh... I just love your vids man.

[@CaptainChristopher]

Rob looking stacked these days

[@xXxcastenada]

11:12 cool pipe movement

[@mikeyacullo]

Good shit bro. Keep it up!

[@micahsauer1106]

I look forward to your videos. I check every day to see if you uploaded.

[@emilcladoveanu1875]

Beautiful , thank you !

[@normanguzman417]

I don't trust houses next to the turbo header. No matter what they are made of hi-temp silicone, or special material. The heat that header generates is much more hotter than a conventional oven. When the hose gets hot (specially on a rotary engine) it gets really soft and that's when issues happen.

[@estebanmatias92]

Beautiful little machine, you guys are artisans

[@djstuffedcrust606]

Riff raff shout out 👏 love your channel and everything your doing

[@jesseselinsky6535]

That’s why I Used PTFE AN lines on all my vacuum for everything

[@Avalanche2]

An exotic turbo build can beat a N/A LS - wow, such an accomplishment.

[@jordanburns8975]

8:18 the absolute most devilish Dahm laugh

[@curtism7203]

I finally know what you car sounds like, Its like putting cards on a bikes wheel and going really really fast!

[@sebastianmartinezsabattini]

Nothing like a Rob Dahm video and a cup of coffee

[@D3AThCAl2DS]

14:00 you can see his dopamine lol dude high on life and exhaust fumes

[@crowiesnest]

Dude ... your V bands are spinning. Loosing boost ? Tighten everything down mate ! Sending the love fron down under . 🇦🇺 😀😀😀😀😀😀😀

[@Wormweed]

Engine sound is much better inside the car than outside. Love the project though!

[@tannerharcus8833]

Father Dahm has blessed us once again.

[@thatdudeparra8803]

so cool to see rob passing by my city, good ol pomona lol

[@michaelnoble7037]

I can't wait to see this thing driven at the track.

[@FaceFullaLead]

Easy fix with for your boost leak with the compression type fitting, which has a brass nut that squeeze's a tapered ferrel over the synflex hose.

[@Graphics21]

I seriously cant wait till everything is perfect. Rob your are a mad scientist 😂😎😎👏👏👏👏

[@andrewjweaver]

On the MAC valve hoses, you could draw 2 lines on the hose with a sharpie such that if you see 1 line you know it's seated, 2 lines and you know it's not. I'm interested in the gearing. I want to see what a good street-able first gear ratio is for a 2 rotor with a modern big turbo. The OEM Mazda first gear is way too short.

[@funkalicious2002]

How long until you get a different gear for the rear? I feel like that would fix most of your drivability issues.

[@fernandop937]

What rear gear would you recommend?

[@funkalicious2002]

@@fernandop937 I think the Z06 from that era has a 3.42, so I would go with at least a 4.30, or maybe even as low as 5.13.

[@ICKY427]

jeez how much power could you make with just ONE rotor? 300 would be dope in a miata

[@1MBStudios]

Team boosted has a few videos on a turbo one rotor, you should check them out

[@paveldzhurylyuk6076]

Pro tip from a Subaru specialist with no 1st gear synchro, when your in neutral at a stop and want to shift to first, go to second then go to first so the 2nd gear synchro does the work for ya.

[@Ghettoize]

great video!!

[@brysonfields2284]

Missed you in vegas, but now im watching you threw a window rn! (i like your shirt)

[@brett2themax]

You know Rob is serious when there is a clean ending

[@ArthurSperotto]

If that's a standard T56 trans, a set of 4.10 diff gears goes wonderfully with it :)

[@variabledust6922]

Omg love the video 👌🏻

[@Sir.VicsMasher]

19:03 I know its just a tuning tool but make sure you are looking at SAE dyno numbers when shooting for a legit number, especially when used for bragging rights against 630whp LS7's.

[@1998hrnjez]

That check engine light just glaring at you while you peacefully drive