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

Interesting

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

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

Exactly my thought!!

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

Yes totally, will will try it!

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

It wasn’t running high octane?

98

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

Impressive that car had enough power to get off the dyno

Haha totally!

But looks like Franz Tost :)

Haha thanks man ;-)

The Cayman always gets short changed!

@@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.

Appreciate it man!

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

Thanks man 🙌🏻

Exactly what I was thinking.

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.

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?

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.

Been looking for this comment. Are we missing something?

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.

@@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.

Thanks man

Cheers!

Exactly 👍🏻😎

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

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

@@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

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

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

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.

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.

Yep loving it!

Thanks and yes to both :-)

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

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

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

@@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.

@@petetheman6263 yeah i meant to say wheel hp lol

lol wut

Nik Gnashers Ha! Mustang dyno I’m guessing?

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

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

Hoffentlich! 😁🤘🏻