sajack

New Dodge straight six 3.0 Litre engine produces 420hp with 22lbs of boost, 540 hp with 28 lbs of boost.
Pretty impressive assuming it stays together.
Wonder if Lexus has considered upping boost on the

V35A-FTS engine?

dan25man

It's hard to tell. Per wiki the V35A-FTS is a 10.5 to 1 compression engine. I think the new 3.0L hurricane in this new charger/challenger is 9.5 to 1. With high boos pressure you want lower compression for knock resistance? Not sure if this V6 could handle 28psi. I know burger tuning has a product for aftermarket tuning of the LS500 motor (https://burgertuning.com/products/jb4-for-lexus-ls500) If you look at the specs for the Nissan GT-R R35 generation 3.8L V6 (https://en.wikipedia.org/wiki/Nissan_VR_engine#VR38DETT) they did a much larger bore diameter, and shorter stroke (95.5 mm x 88.4 mm). And even lower compression at 9.0 to 1. I think toyota/lexus designed this V6 with their trucks and SUV's in mind moreso than past generations (85.5 mm x 100 mm). I'm no engine engineer but I know that general a longer stroke (under square) design when turbo'd is more for making great torque, at the cost of high horsepower.

If they had gone back to the old OG 4.0L V8 and Twin Turbo'd that would of been the best. That original 1UZ-FE was 87.5 mm × 82.5 for comparison. and also was 10.5 to 1 compression.

But I agree this new engine for dodge is going to make the tuners go bananas. I mean, heck I kind of want one now...

Lingus

The challenge for the LS is the fact the turbos are fixed nozzle. No tuning can overcome the limitations assoicated with a fixed nozzle. Perhaps there are some parameters that could be changed by tuning to address lag that fixed nozzle turbos present but the limitations are built in.

dan25man

Can you explain what you mean by "fixed nozzle"? I'm not familiar with that term. I thought all turbos the exhaust gasses hit the hot side of the turbos wheel, then that drives the intake compressor wheel to build boost? I've seen some turbo designs with a variable exhaust gas outlet to help increase the gas velocity to help the turbos spool faster lower in the RPM range. And then Porche has variable vanes, which I think change the Angle of Attack (AoA) of the exhaust turbine to optimize for turbo spool response? I'm not an expert on turbos or turbo differences.

Are you saying we can't just slap a pair of 68mm Garret turbos to this engine and make 1200 hprs?!? I thought toyoDas were supposed to be "overbuilt" (jkjk).

Lingus

Fixed nozzle versus variable as in variable vane like most diesel trucks are equipped with.