AMIRZA786

The 2023 Honda Civic Type R has a 2.0L turbocharged 4 cylinder @ 315 HP/310 ft-lbs torque. The 2019 has 306 hp. A lot of the newer 4 cylinder turbocharged Inline 4's replacing V6 and V8's are above 300 HP

SW17LS

From his post, actually I oversold it:

And as was said above, lots of turbo 4 cyl are over 300 hp.

This little V6 just has no relevance today.

Toys4RJill

But the I4s back then weren't making 300hp. A new engine like that would have more power today.

SW17LS

Not a lot more power. Theres only so much they would be able to get out of a NA 1.5L V6. The Toyota/Lexus 3.5 only gets 300. The question is today which would you want, a small low powered NA V6 or a modern turbo 4, the turbo 4 is going to feel a lot more powerful. In the Avalon I have right now, the 3.5 is smooth but you have to get the RPM up over 5,000 to get any kind of meaningful power. Hard to go back to NA when you're used to turbo power.

AMIRZA786

Actually you can get 320HP out of an IS350 with an RR Racing tune, PPE headers and a bigger exhaust. The RR Racing tune brings the Redline up to 7200 RPM. PPE headers are not CARB compliant in California, so I was considering buying the tune, but it wasn't worth $600 just gain 14 hp

SW17LS

Well sure, thats with a tune, aftermarket headers and exhaust and thats the 3.5. You're not going to get 300 hp out of a 1.5L NA V6 even with all that, let alone from the factory

AMIRZA786

Not without forced induction using a Big turbo (or twin turbos), which means now adding an intercooler, oil cooler, additional cooling and there goes reliability

mmarshall

It’s a 1.8L, Steve, not 1.5…..I’ve never heard of a 1.5L V6.

SW17LS

Oh well then! Whatever, its a very small little V6. 1.8 vs 1.5 doesnt impact what I'm saying at all.

AMIRZA786

LOL nope, not with a 1.5L. When I was part of the Honda Civic Si forum, people were putting bigger turbos, downpipes, and even Flex fuel kits to get near 300 hp and were blowing their engines and clutches left and right

AMIRZA786

Tomato, Tamatoe

mmarshall

One does not need 300 HP in the average subcompact sedan or crossover. However, with today’s powertrain engineering, a lot more than the 129/157 power figures for that original 1.8L V6 could easily be done with the same block…even without forced-induction.

However, like I mentioned in the write-up, the current state of the auto industry has become so obsessed with electric powerplants that we are not likely to see any serious attempts at doing (or redoing) a small V6.

AMIRZA786

Nope, not without forced induction or some type of electric assist powertrain, or a combo of the two. Cannot be done reliably with an NA 1.8L. I bet you @Striker223 will back me on this

geko29

There's a little more nuance to it than this, but the simple math says if you can get 300hp out of a factory 3.5L NA V6, an engine of a similar design but half the displacement should give you somewhere in the neighborhood of 150hp. Let's be generous and say 180hp if you take advantage of the lower piston mass to make it rev out to 9k rpm or something like that, but then again that runs counter to the stated goals of the thread.

Toys4RJill

You have completely mislead with your argument. There were no 300HP I4 turbos back then. There are today, so it is very reasonable to assume there were could be 400 small 1.8 turbo I6s today. Toyota has a 300HP 3 banger. so it can be done. but it is pointless, it would cost too much and would not be worth it.