4G vs 3G Dyno numbers

Similar HP figures on paper, but dayumm!!




Blue is 4G, red is 3G

 

Sorry, drove a 4th gen the other day and it felt like driving a massive golf cart. Didn’t rev past 3.7k though.

 

Also, I think these guys are somewhere in Colorado so of course an NA engine is going to perform worse compared to a similarly powered turbo engine in high elevation.

 

That's not true. Forced inductions motors suffer from high altitude as well. sometimes worse in certain applications. All depends on how the boost levels are managed by the engine. Example: 20 PSI of boost creates less manifold pressure at higher elevations.

 

With the numbers their 4G put down, the 4G is either not affected by higher elevations or Toyota is underrating their numbers. Maybe both?

I wonder what their truck would put down near sea level.

 

Hypothetically, let’s say the ECM/ECU manages the turbo to maintain 20psi boost over ambient and doesn’t work to a set manifold pressure.

Sea level ambient is 14.7psi, so at sea level you’ll see 34.7 psi manifold pressure.

Up at 5000’ in the nevada mountains, you’ll see 12.8psi ambient.

That means an NA engine loses 12.9% manifold pressure (assumes WOT is ambient which isn’t quite ever true but close enough for the thought experiment) ((14.7-12.8)/14.7)

while the turbocharged engine loses only 2.7% manifold pressure((34.7-32.8)/34.7). I’d be interested to see what conditions a forced induction engine would suffer worse than an NA engine.

the coolest part is that there’s probably some room on the compressor map to allow the boost to vary to keep a set manifold pressure and lose nothing up to some altitude, but that’s beyond the info any of us have

 

Wonder if that 3G has a tune.

 

Kinda wondering the same thing.. engine is only rated for 278hp and 265lbs.. Maybe the 4G needs more break in

 

Sweet, thanks for sharing real-world info.

 

Dynos always read different from dyno to dyno depending on what the correction values are set for. I've seen cars make 50 whp less from dyno to dyno(talking cars in the 500 hp + club)

 

Can't say I'm surprised by the numbers. It's hilarious to see people who know nothing about engines say the "4 banger" won't have the torque of the V6 when it's exactly the opposite. The torque on a turbo engine is typically fantastic and the proof is in the first post of this thread. That power band is something you're absolutely going to feel.

And yes, at altitude, the elder V6 is an absolute weakling. When I go to Colorado in the summer, passing cars on a two lane road is legitimately tough and takes planning. A turbo engine will leave NA engines for dead up there. It's not even remotely a competition.

 

The altitude is corrected for in these readings. Probably why you the numbers are a bit high. Just looking at the curve you can see how much more tq the new motor is making. This will solve most of the drivability complaints of the 3g.

 

What does massive golf cart mean to you ? Good? Bad?
Golf carts drive like shit to me

 

3% drivetrain loss?? Why didn't Toyota market it as a 300hp truck?