Why My Porsche 718 GT4 Feels UNDERPOWERED!? | Dyno Test!

Since I have had the GT4 I always felt that it lacks in power slightly. Now I know why. I hope you like the idea of 5 minute Friday and feels free to leave suggestions below for this new series!
/ carswithluke
Thanks to Sportec for letting me use the Dyno sportec.ch
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[@philtechGT3]

I’m a professional chiptuner with a dyno and I also own a 718 GT4. On those car you NEED to send air on the side scoops. It’s where the intake is. Because the air sent by the front fans can’t reach the side scoops.

[@TDS981]

Interesting

[@denisbarry9436]

This is why I read all the comments. Finding the guy that sees what everyone else missed. Makes perfect sense

[@Speed_7545]

That and the gearing is way too long. If it had proper gearing then it would be faster than some 911's.

[@wesoneakalN]

Exactly my thought!!

[@SeanyMacks]

Wouldn't the engine just pull in the air it needs?

[@Basz112]

This deserves a second run with vpower and more kilometers in the engine.

[@carswithluke]

Yes totally, will will try it!

[@Basz112]

Cars with Luke btw, 5min Friday, good idea. Will drop some suggestions when one comes to mind 👍

[@eSysmanSuperYachts]

It wasn’t running high octane?

[@carswithluke]

98

[@Whit3tec]

@@carswithluke Higher octane definitely won't improve power of a NA engine... Also keep in mind that dyno's do have measurement error.

[@aftabmohammed7311]

You should not have driven the new Porsche 911. Everything seems slow after that. Lol

[@Chris-hw4mq]

Impressive that car had enough power to get off the dyno

[@markrobbins5984]

Close your eyes and the test engineer sounds like Gunther Steiner!

[@carswithluke]

Haha totally!

[@ericgabriel3902]

But looks like Franz Tost :)

[@I.o.a.n.n.i.s]

395!? That sounds really depressing😔 I can relieve you of this slow car anytime bro😄

[@carswithluke]

Haha thanks man ;-)

[@MagicAyrtonforever]

The Cayman always gets short changed!

[@ConsumerGlobal]

@@carswithluke HP ratings are for the engine not at the real wheel inclusive of drivetrain loss which is on average 15% per several studies like motortrend. This means that at 395 your car is actually significantly more powerful than Porsche advertised as with the car that rated 380. This is pretty basic stuff. Other than that good content.

[@andrescastano6056]

Post whatever you want man ... your taste is what makes the difference. Keep it up!

[@carswithluke]

Appreciate it man!

[@stefanjust1912]

Fantastic content ! Keep publishing, please ! That Dyno guy is a real gem to have on the channel 🤓

[@carswithluke]

Thanks and yeah he’s a great guy that really knows his stuff!

[@ubonrat8653]

Very interesting & love the 5 min Friday idea

[@gio3549]

Loving every minute on this channel, well done Luke! what a beautiful machine..

[@ariffinrazack7748]

5 minute Friday's a great way to add segments to your channel!! Love your work Luke!!

[@BaronDeRothschild]

Great video. Would have loved for this to be a bit longer. I wanted to hear you and the engineer having a longer convo. Thanks again for the time you put into these videos. We appreciate them.

[@ljocchino]

Porsche + Dyno Test = Car porn at its finest! Really like'n the 5min Friday idea. Nice work Luke!👍

[@carswithluke]

Thanks man 🙌🏻

[@bezaproductions8106]

Love the 5 min Friday vids Luke. I want to know more about your equipment and your trane of thought before, during and after your cinematic scenes. Respect your cinematography Luke🤘. Great content 👌

[@pavelzhogin4825]

The moser you live the more you learn! That was very interesting and educational, thx!

[@raheeb1]

420PS is the rating at the flywheel. What’s the problem in getting 395-400?

[@Mockle07]

Exactly what I was thinking.

[@goldennugget223]

Awesome stuff, big up to the dyno guy

[@carcreationsyt]

Really look up to Lukes video style. Amazing job. Learning a lot from watching, thanks so much!

[@experimentist]

5 minutes of presenting how you achieve this color look on your videos like camera profile picture settings etc would be really really nice. Thanks Luke! A fan since 9000 subs. Cheers!

[@freekickerz]

Da ich auch einen Boxster fahre, kann ich dir sagen, wieso so geringe Zahlen rauskommen: das liegt an der Messung - der GT4 bekommt nicht genug Luft, da es ein Mittelmotor ist und die Luft hinten über die Seiten eingezogen wird. Hier braucht man ein spezielles Gebläse (links und rechts seitlich). Hatte vorher auch ca. 15-20PS weniger. Auf dem richtigen Prüfstand waren es fast normale Werte (trotz 102 Oktan, das macht bei dem OEM Sauger kaum was aus).

[@hikingjoe4752]

Habe auch einen Kommentar geschrieben, denke auch dass das das Problem ist. Außerdem staut sich bei diesen Sideinlets durch das Blade verstärkt die Luft davor was bei höheren Geschwindigkeiten für etwas mehr Druck sorgt und mehr Luft in den Motor ,,presst". Das heißt die letzten paar PS die aufm Prüfstand fehlen werden höchstwahrscheinlich auf der Straße da sein.

[@mrj.h1332]

Interesting how many factors go into this. Nice vid Luke! :)

[@GladiatUnispect]

Very nice type of videos in addition to your usual really superb content !

[@swololikesolo1625]

Wonderful filming. Best car channel out there!

[@911scales]

I did not expect such an informative video! 10PS only depending on the age of the fuel - that’s nuts!

[@mattyp3119]

I don't get it.. dynos measure in wheel horsepower. 395whp is with 10-15% loss.. that engine makes over 430

[@jjaisli]

Thank you. 200+ comments and this is the only one I’ve seen that mentions the bleeding obvious. Manufacturers measure horsepower at the crank. Dyno testing the car will measure horsepower at the wheel. Most cars suffer 15 to 20% parasitic drivetrain losses. Are we in the twilight zone here?

[@bighitjumper]

no, "p-rad" which is "whp" is about 247kw in the video, which is about 335hp p-rad. In the end it shows 395 hp "p-mot" which is like "break-hp". Of course the dynos measure wheel horse power, but by knowing the spinning masses and the friction of the dyno and the time it takes to slow down the dyno with pressed clutch you can calculate (or rather the dyno does it for you) the friction of the power train of the car. and by that the power which is lost in friction. By calculating that backwards you also know the engine power.

[@alecman95]

Been looking for this comment. Are we missing something?

[@jjaisli]

bighitjumper That makes more sense but the thing is, they really DON’T know. They’re making educated guesses at the numbers. If you’re getting readings on a Dyno, it’s fine to compare Whp with the same model car under similar conditions on the same equipment. But trying to determine whether a car matches factory power ratings and talking about mileage and fuel octane is just speculation. Manufacturers measure output by their own standards. Usually engine ratings are based on an overall average controlled minimum under specific conditions. And usually engines will vary a bit, especially during the length of production run.

[@bobstarr]

@@tuanduong7667 not at all pointless, there are two categories, close - this car and underrated - the Toyota Supra. Based on many tests with many variables but in the end we know.

[@MoHeidariFar]

Great idea on 5 min Friday love to see more regular updates Luke

[@liipka7025]

Great idea Luke!

[@Koisny]

Small gripe with GT product - you need to press 3 buttons to enable auto-blip, open valves and disable start-stop, on non-GT just flick mode selector to Sport

[@ducatistajp5214]

Luke mate, this was an awesome clip. Direct to the point and not over edited/staged. Regards to topic, modern manufacturers are clever. Always need to tune after exhaust swap. Both cars and bikes. Taking cat of my hyper soon 😛

[@isheanopangandu8804]

Short and sweet I like this. Stay the course

[@carswithluke]

Thanks man

[@zockerplay3314]

Very cool and interesting Video!

[@HTMLrulzd]

Already like that format 🔥🐐

[@comandantefpv]

Well done Luke. Your videos are stunning. One of the next Fridays maybe you'll show us some of your equipment. I'm sure your videos are more talent related, but it would be nice to share. Cheers

[@trevourmcgoon2858]

There you go...full of information, thanks 🤙🤙

[@X99Zero]

Is the part 2 of Italy road trip coming? That vlog style video was great, and the food!

[@chrisH248]

Great topic and very interesting content.

[@britforlife32]

Fantastic video Luke!

[@carswithluke]

Cheers!

[@JermsDNA]

Would love to see a 5 minute Friday on your video set up while driving, the drone shots, lenses, microphones, suctions, gimbals whatever it may be when you're driving :)

[@kingcrafter361lp6]

I just LOVE your videos!!!!!

[@toplabels]

Porsche numbers are to the crank not to the wheels. All manufactures numbers are crank numbers.

[@Roland_Rohrle]

Exactly 👍🏻😎

[@ParalyzedNight]

Yep, why is nobody getting it? Does anybody that watches this channel know anything about cars?

[@kimmok3734]

@@ParalyzedNightSorry mate, but you don't get it. First run was like 245kw(338ps) from wheels. 338*1,15 is 388PS from engine.

[@ParalyzedNight]

@@kimmok3734 that was the first run. Takes a few to set everything up correctly. The last run they did was pretty much spot on power to the wheels from Porsche claimed crank output. It's a good power level

[@thaalrasha]

Yeah but if you Dyno a BMW for eg you get easily the advertised number and most likely and extra 20... Look at those Supras also ... they make way more stock than the manufacturer specs. I guess it depends on the manufacturer as well if the want to be conservative or not... then here the engine is in the back, the car might not have enough air in the side intakes with a front fan

[@theLEGOguy22]

Great video - very interesting!

[@elroz1675]

wow. quite a few factors that go into this! educational.

[@djdiscopapi]

Great material! Fan from LA, Calif.

[@carswithluke]

Thanks man, hope to film out there again as soon as they mayhem is over.

[@0TheDudeHAHAHA0]

Really informative!

[@faebyfrohnatur2076]

5MF - love it already now😍 great! And: I don‘t wanna know how many PS my car has then effectively😂

[@lestersanchez5534]

5mins Fridays. I love it

[@isimon.]

Thy Dyno-Guy sounds like Günter Steiner from Haas F1! Lovely to listen to :-)

[@SzymonMaliszewski88]

Great idea with 5 min friday !

[@stevereno6799]

Advertised power and power at the rear wheels is always different. Driveline loss APPX 10% to 15%. His car's numbers, with exhaust mods, are actually pretty good. It puts his HP at about 435 by my estimation.

[@philm.1045]

Luke, how about a walk around of the GT4; spec, mods, etc...

[@vicko22100]

Hey Luke, I think you shud do a combined video of all Brolls done on your car/any in one video.....just a suggestion for 5min Friday idea.

[@Carshorts864]

Great content.

[@pascalsteiner9926]

I love the idea of 5 minutes with Luke every friday!

[@Jorcap]

It sounds like a racecar, so cool

[@nickgalla-barth6336]

A long shot here, but could the engine management system have made alterations, based on the detection of the new exhaust, that could have altered the power? Could also be the Canton (ZH, 'Z'u wenig 'H'p)

[@ArosaMike]

Changing the rear silencer isn’t going negatively affect the long term trims to fuelling and ignition in the Powertrain ECU. A reduction in back pressure would help liberate more power due to a reduction in pumping loses, although that can inevitably mean a reduction in torque lower down, but usually only if the engine relies heavily on back pressure (not normally the case on high performance and large capacity engines). Furthermore, the video isn’t particularly clear, but I think he’s suggesting that the car in general is down on the figures, but his car is up on the other standard car they’ve tested.

[@gauravm.]

If possible, please consider filming and colour grading process of your videos as a topic for upcoming 5 Minute Friday, the colours and the shots in your video are so pleasing.

[@InfiniteTripping]

What an amazing car!!

[@StefABtv]

*Would love to know what camera you use Luke and lens + gimbal for your vlogs and cinematics. In the market for a new camera. Thanks!*

[@KJ_XCV]

Hey luke, maybe you could do some videos where you show us your favourite restaurants or try new ones? Cut in a few clips of the journey there and you try the food and leave your review? You seem like a man of taste so I'd really enjoy watching something like that.

[@neilmcmahon]

As somebody else said, air needs to be fed to the side scoops and you are probably at altitude also because I saw the ambient atmospheric pressure at 965mB meaning there is less oxygen in the air too.

[@trolololosh]

This dyno looks like a laboratory, so cool

[@ap.l9236]

Maybe you should place a fan blowing fresh air towards the driver's side intake vent.

[@opieg7333]

The air is for cooling and the radiators are up front. Blowing air at the intake doesn't add power per se, unless significantly colder than the room temperature. If the radiators do not get airflow while an engine is running at higher rpms, they do not work and the engine heats up, which is bad for power and longevity. It may seem counter intuitive, but blowing air at an engine intake doesn't force air into the engine since nothing is capturing the air to increase pressure.

[@turahtid]

The JCR exhaust sounds so good

[@carswithluke]

Yep loving it!

[@HariNambiar]

Air flow can be improved to the car for sure. One other thing that got me thinking was the exhaust or the cat back that was fixed. Hope that is not being restrictive in any way.

[@christianfloehr]

Fresh Friday Fuel for me please!! 🤣🙋🏻‍♂️

[@audi0005]

Greetings from Zurich 😎

[@heisenberg5452]

Der GT4 passt einfach perfekt zu Dir! 👌🏻

[@Reiches85]

As he said in the beginning of the video, the car needs to be pushed to release full power. If you are mostly cruising around it will never have the power it should have. This is done automatically via the control device to save fuel and be efficient.

[@georgiunguzov3609]

What picture profile are you using on your sony? Love the videos and the quality

[@filipesantiago2182]

Great format! Can you do a video about what you do for a living? I assume you work with video production, but I’m curious.

[@carswithluke]

Thanks and yes to both :-)

[@kam4811]

Wow... makes me want to get my Spyder on one and see the results... or not !! How’s the exhaust sounding Luke? Has it sorted the sound out or could it still do with an OPF delete?

[@Yaka_asha]

Best I ever saw.

[@grahamcrane83]

I put my old gt4 on the rolling Road. You NEED to feed the side air intakes with cold air.

[@WDLC1911]

Keep in mind that the horsepower at the wheels is less the horsepower at the flywheel. A ROUGH estimate is about 10% power losses through the drivetrain. You're good.

[@carswithluke]

They just confirmed to me this is the power at the crank.

[@michaelphillippi4676]

I thought all call nuts knew this bit of info by the time they were 13 yrs old.

[@stubailey9433]

Think the Gt4 would look better without the big wing i.m.o. Maybe a duck tail? Love the videos.

[@guillaumecom114]

This car is amazing. It’s my dream to drive this car

[@kirinramanath]

I don’t think I’m far off when I say you produce the best car content on KZbin. Everything is crisp and there’s no unnecessary flashy nonsense that you see in a lot of people’s edits. Production quality is just far better than everyone else in the game. Everything pertains to the story! As a filmmaker myself, I’d love to see your work flow; in terms of gear, preprod and editing. Love your work, and am here for the long haul, keep making crazy content 🤙🏽🤙🏽🤙🏽

Driven one recently for few days. TBH I dont care about the number while driving GT4. Just love the analogue experience.

[@alanvlah8489]

Add 10% ethanol and your problem with poor fuel will go away. Adds octane back you are lacking and reduces combustion temps ensuring every degree of ignition timing being pulled by standard ecu returns. Also car can continue to make power depending on your dyno room on pull 3 and 4 as ecu adapts vs temperature... very dyno room specific.

[@swenmeyer6963]

Hi Luke, the most important on a dynotest is the cooling of the engine, it‘s difficult to cool the boxster engine in the back. Right now is quite hot for a dynotest, do it again in november😉 Maybe we can do a video together with my spyder

[@alexandrehamen1186]

Reminds me of Peter McKinnon’s 2minutes Tuesday series

[@marcovanni1851]

I see fun times ahead with the GT4 lol; what's next... The performance exhausts sounds pretty good.

[@robc1014]

Well yes, it will read less than what Porsche says the PS is. PS is measured at the engine crank. Its the engine power output only. The dyno will measure the power at the wheels which measures the engine output minus the mechanical losses. Plus tyres can play an affect the results on a dyno and all dynos measure differently, they are calibrated within a tolerance.

[@atastefortheroad4475]

A powerful reminder that you are what you eat. Like an artisanal restaurant or a a dedicated olive shop, you'll now have to add a petrol station project. Fuels with Luke could cover global oil terroir, fresh Brent vs West Texas Intermediate, how to age fuels, and 100 octane processing tips. All told w/Swiss precision and your great cinematic visuals. Lovely sponsorship opportunities too. Keep 5/Fridays coming along.

[@John_spartan]

Well I think it has something with your exhaust to do , if you put a new one on that is not stock and it has a bigger diameter it can take some of your power .. so you have to get it tuned to get your 420 and + horses back again, or you can try make a Dyno run with the stock exhaust on .

[@Ozmeister666]

395 crank is easily 420 engine though. Normally on a RWD car, you'll have around 10% drivetrain loss from the engine to the crank.

[@travis3810]

They've already adjusted for that. Wheel hp was ~335.

[@petetheman6263]

@@travis3810 Crank means HP at the engine. The question is whether the 380 is HP at the wheel or if it's adjusted to an estimate at the crank. If it's the latter, the question is, how much driveline loss are they assuming. If it's WHP, then it's about right, as that will always be less than the engine estimate provided by the mfg.

[@travis3810]

@@petetheman6263 yeah i meant to say wheel hp lol

[@mstegs5477]

lol wut

[@muratk.8296]

Try using the BP Ultimate or the Aral Ultimate. 981 GT4 runs smoother on the BP than other fuels. I use Aral Ultimate 102 and much better response, less ticking noise and the exhaust stays much cleaner, so cleaner combustion.

[@Xterd]

Hey Luke, what rear spoiler raiser do you have? I just bought a 981 GT4 and looking to raise the spoiler.

[@brendanzhang6330]

I would say don’t bother too much with the initial dyno number, because it’s irrelevant in the sense that 400hp on one dyno is different from 400hp on another dyno. Heck, humidity and temperature will alter the dyno numbers. I would say that dyno is only a tool of comparison. Like before and after a bolt on. Heck, my car makes close to 700hp stock on renntech’s dyno and that means nothing to me. Butt dyno are more relevant :)

[@brendanzhang6330]

Nik Gnashers Ha! Mustang dyno I’m guessing?

[@Matt_factory]

You should buy aditiv to stabilize gasoline and increase octans, and you will always keep good power, like motul gasoline stabilizor does Cheers

[@SpilkersKompass]

I don’t expect it to match the spec power. Deviation looks for to high... didn’t expect that from Porsche. Whereas, the power density is remarkable for a natural aspirated engine

[@ArosaMike]

If the car wasn’t put in Dyno Test mode with the PWIS tool, it will be on a backup map. The cars go into a protection mode if they see no front wheel speed when the rears are spinning

[@piotrtralala977]

How about favorite roads around Zürich

[@raduvasilealeman3872]

Luke how do you compare it with the Cayman 981 GTS you had for a while?

[@matthiaskettner6686]

I‘m a bit surprised. Porsche horsepowers are normally really quite a lot more than what Porsche officially say. Especially on the turbo models but also on the non-turbos.

[@mixworks-de]

Not on those that Sport Auto test and puts on the dyno. Porsches seem to rarely exceed spec, rather the opposite.

[@DJSweep75]

Dyno pulls are for quarter mile guys, drive it around the passes and tracks and enjoy the handling. And don’t compare it to the explosive power of a turbo car. The GT4 is such a fantastic car to drive, no matter if it has a few horses less.

[@CarToneHK]

395 whp sounds right, assuming a 10-15% drivetrain powerlost, although gears are still long, so get that sorted to get more wheel torque

[@kevinblankenburg4816]

Take your car to the Nürburgring and visited Manthey while you're there. They have some bits and bops for your car.

[@Banana-Joe007]

Tank V-power dann geht er schon gut. 395 PS ist gut. Glückwunsch! ✌️😄 LG

[@carswithluke]

Hoffentlich! 😁🤘🏻

[@brooklynreal9527]

Just learned something new here. Thanks.

[@eAlex_me]

Please on next Friday: When you upload a video to KZbin which file (mp4, wmf, mov ect.) und which data rate (MBit/s) you are using? ...or just one of the five minutes ;-)

[@sandhirannadar8085]

At what altitude was this test performed? A naturally aspirated engine usually loses power at higher altitude and the quoted figures are for sea level, if I'm not mistaken...