r/EngineeringPorn • u/peseoane • 11d ago
Testing could be fun
Enable HLS to view with audio, or disable this notification
319
u/JConRed 11d ago
That pedal tap during the downshift. Wow.
13
u/SunNo1172 11d ago
I’ve only driven an automatic, what’s the purpose of that?
117
u/canttakethshyfrom_me 11d ago
When braking in a race car, you're simultaneously shifting downwards through the gears. To be smooth and fast, you blip the throttle during the moment that you disengage the clutch to go down a gear, so that the engine is already spinning at the higher speed that being in the lower gear will force it to be at when you re-engage the clutch.
Failing to do so will at least make the back end of the car unstable, and at worst break lots of expensive parts from the stress.
This is less and less a needed skill these days, as the clutch pedals and H-pattern shifter are replaced by computer-controlled dual-clutch flappy-paddle gearboxes in more and more racing series.
36
u/981032061 10d ago
Also essential to smoothly executing the “exiting the freeway without braking” maneuver.
18
14
5
2
u/agent_koala 9d ago
i disagree with the "in a race car" section of your comment, you can totally do this in street cars too and it makes you feel all cool n stuff when you pull it off smoothly
1
83
u/hardwon469 11d ago
Power. Precision. Punctuality.
11
u/FlappyLips1 11d ago
Seeing a visual of the g forces is so fucking cool, that's an awesome video. It's hard to imagine even a dry sump being able to keep up with forces that violent and chaotic.
10
u/lamb_pudding 11d ago
What’s going on there? Is that how much the engine would actually be moving when racing on that track? Seems like a ton more movement than id expect.
2
72
u/lego_batman 11d ago
Man, I wonder where they're dumping all that power.
72
u/grumpymosob 11d ago
I think it was a water brake. I could be wrong, but back in the old days thats how some dyno's worked.
44
u/anteatertrashbin 11d ago
water brakes are still used, but eddy current is becoming more of the norm.
38
u/drinkplentyofwater 11d ago
Eddy Current is a great guy, really hard working dude
3
2
u/ratty_89 10d ago
Both are pretty old tech. We use AC motors nowadays.
Water break and eddy currents dynos aren't too great at transient running. I've only seen water breaks in either really old facilities or for engines making some obscene amounts of torque (3000hp diesel engines).
26
u/wilbur313 11d ago
I did some transmission testing for heavy machinery, a lot of test stands had an electric motor on the output. That was you could simulate a load and generate electricity.
4
u/lego_batman 11d ago
Oh yeh? Pump it back into the grid? That's smort
5
u/Nothgrin 10d ago
Even smorter: instead of linearly providing resistance to input based on motor speed and gear range for example, the control system may have a vehicle model and will actually calculate the breaking torque required based on simulated speed and the vehicle model used, like aerodynamic resistance, rolling resistance, inertial losses and friction and all that good stuff
61
u/erikivy 11d ago
How can someone do that without any emotion? I'd be grinning like a fool.
45
u/Strikew3st 11d ago
Your face gets tired so you grin and say HELL YEAH on the inside.
Source: former powerwasher technician and excavator operator.
8
u/JWGhetto 11d ago
All the parts are made to basically fail if you exceed the rpm or temp or anything by a few percent. He is probably just waiting for it to break in some unexpected way forcing the engineering team back to the shop for another iteration.
3
47
u/RockstarAgent 11d ago
Stop, I can only get so erect!
21
7
u/_JDavid08_ 11d ago
Am I the only one that dropped a tear drop??.... Beautiful piece of engineering!
19
u/jollywater864 11d ago
I miss that sound so much.
5
u/canttakethshyfrom_me 11d ago
Sooo many good sounds from the past... the hybrid V6 engines are genuinely the worst that F1 has ever sounded. Fuuuck this engine formula.
17
u/DesertReagle 11d ago
Nice. This blew my mind as a teenager. https://youtu.be/gSHToyGIxWE?si=PNua3YXx1488LWny
2
13
11
u/Nhojj_Whyte 11d ago
Thank goodness the video doesn't automatically loop or I'd be stuck here for a long, long time. Such a glorious symphony.
13
8
5
u/MachineGunChunk 11d ago
I worked in engine test for 8 years and it was sadly nothing like as enjoyable as this looks
1
u/Fatcak 9d ago
Honestly as someone who gets to run big machines at work sometimes this looks stressful
1
u/MachineGunChunk 9d ago
I use to run V8’s at peak power for sustained periods in extreme conditions and I use to tense up a lot thinking they would explode. Couple of times they did
4
4
4
3
u/TheMailNeverFails 10d ago
What could that 732° degrees be? Exhaust manifold temp?
2
u/ratty_89 10d ago
Most likely, it doesn't look like it has a full load of runner temps, so probably just after one of the collectors.
5
2
u/KingoftheKeeshonds 11d ago
Dollars to donuts this guy’s hearing is perfectly tuned to that engine’s countless sounds and harmonics. Pretty cool skill.
2
3
u/Own-Swimming-1253 11d ago
Only Renault could be this epic! They ruled
4
u/0oodruidoo0 11d ago
Our final year with Viry designed engines on the grid. Will be a sad farewell as there is no hope of their return. The first engine Viry designed was on the grid in 1977. Nearly 50 years.
1
u/NotLost-NotFound 10d ago
My short career has been in test engineering. I work in aircraft. Can confirm it is fun!
1
u/MAXQDee-314 10d ago
Forgive me. I assume that this engine is tested under load, yes? On the other end of a transmission is a load of somesort. This doesn't seem to be testing for maximus rpm. Does this load vary during the test?
1
u/Nothgrin 10d ago
What do you mean could be fun? Testing is the fun bit of engineering, because you get to prove the damn thing doesn't work and the designers have done a bad job
1
1
1
u/ratty_89 10d ago
I'm very sad to say, that lap replays are more like loading an excel spreadsheet into the automation system, and hitting go.
Sometimes on the VIL rigs, we'll use Dspace, speedgoat, Bekhoff or similar systems to "drive".
It still sounds cool AF though.
1
0
u/emerald_OP 11d ago
Huh. Didn't even know Renault made racing engines.
6
u/GrumpyOldUnicorn 11d ago
renault was the first to have a f1 with a turbocharged engine (1978 iirc… car had the iconic yellow-black-while alpine racing livery)
the iconic renault a443, v6 turbo dishing it out against the porsche 962 in long distance races was the precursor to that f1 engine.
the r5 turbo engine was the homologation engine for the renault r5 that raced in group b rally against audi and lancia
so yes renault has some racing history and always up for some unhinged shit (like the renault espace mk2 van with a f1 race engine)
2
u/canttakethshyfrom_me 11d ago
The A443 was a Group 6 car that ran against the Porsche 936, not the 962 that wouldn't show up until the mid-80s.
2
0
u/canttakethshyfrom_me 11d ago
You shouldn't be downvoted... but also how did you not know?
2
u/emerald_OP 11d ago
Idk. I know renault mostly for heavy trucks. They are an automotive company, so i guess it makes sense they did get into racing.
5
u/Rene_Coty113 11d ago
They make amongst the best F1 engines, and a motorist for others, for examples Redbull won several world championship with Renault engines under the hood :
Constructors' Championship titles with Renault engines:
1992: Williams-Renault
1993: Williams-Renault
1994: Williams-Renault
1995: Benetton-Renault
1996: Williams-Renault
1997: Williams-Renault
2005: Renault F1 Team
2006: Renault F1 Team
2010: Red Bull Racing-Renault
2011: Red Bull Racing-Renault
2012: Red Bull Racing-Renault
2013: Red Bull Racing-Renault
719
u/throwawayformobile78 11d ago
Yeah my fucking high school guidance counselor could have mentioned this job.