Leafy

iTrader: (1)

I just had a small stroke while trying to think about the engineering required to make that work for a 100k mile engine life. Dem cylinder pressures and temperatures.

NiklasFalk

iTrader: (1)

What about having PWM injection, starting the burn lean and then feed the flame as it progresses.
Good luck analyzing that with a wideband in the tailpipe

I have of course no idea at all about what the real tuning key for DI petrol is...

Oh, well, with time and enough failures, someone will find some power by messing with some tables.

Leafy

iTrader: (1)

Normal spark ignition DI gas engines already really depend on injection timing. For example, once HP Tuners unlocked that table for injection timing on the DI turbo solstice and cobalt motors the amount of power and torque made on e85 skyrocketed for people who knew what they were doing.

But doing compression ignition with normal pump gasoline...

EO2K

iTrader: (37)

Bro, who needs spark plugs when you've got det on your side?

williams805

iTrader: (2)

Some manufacture do the lean initial injection with follow up fuel. It's like Hondas CVCC in a modern way. Check out the tops of DI pistons. A lot of them have a little bowl the injector is aimed at. They do the lean burn in "stratified mode" there. They also do regular homogenous burn with more equal air fuel mix throughout the chamber, but I believe the fuel would have to come in much earlier in the compression stroke or intake stroke to achieve this.


They are trying to develop. This is the first mainstream article I saw about a year ago...
Hyundai Developing Gasoline-Burning Compression-Ignition Engine

sixshooter

iTrader: (12)

High pressure common rail diesel engines have been doing this for a few years now for the sake of meeting the newer emissions laws but I didn't realize it was being done in gasoline engines. Pilot injection, plus the better atomization due to higher pressure injection, was good for a 15% or better increase in economy in diesels. Does the DI in a gas engine work at very high pressures also?

deezums

iTrader: (3)

The LNF cobalt has a cam driven secondary fuel pump IIRC, R56 mini's also have a secondary mechanical driven pump, but I don't think they push the pressures of the LNF.

Mini runs 5 bar in tank, 50 on the block IIRC.

williams805

iTrader: (2)

Yes high pressure though not as high as diesel which can be 28,000 psi. Most GDI I've seen run low (relatively) out of the tank to a mechanical fuel pump driven by the cam. Some vehicles (see Audi) have provems wiping the lobes off the cam for the mechanical fuel pump!

IIRC idle pressures on the high side can be 300-500 psi. Under load can be in the 2500 psi range. Different manufactures use different pressures but I've read these numbers before.

Also I believe a lot, if not all, are using piezoelectric fuel injector, which are differnt than solenoid type found on port fuel injection.

ScottyP3821

iTrader: (2)

Uggghhh supercharger non sense. Im usually not the aesthetic ***** but the ND REAR makes me flinch when I see it and gives me flash backs of the 06 eclipse.
(in fetal position, thumb in mouth)

dieselmiata

iTrader: (3)

Personally I see a bit more Alfa 4C than Eclipse in the rear. I'll have to see in up close and personal before I pass complete judgement though.

asmasm

iTrader: (1)

MAZDASPEED Motorsports Development

turbofan

iTrader: (1)

That looks fantastic.

Erat

iTrader: (5)

I just got a chub.

NiklasFalk

iTrader: (1)

With some good graphics you can make the best of any shape.

Nice number as well

Now, who have an urge to make a racer from a NC? My desire dropped quite a bit seeing the ND develop.

ThePass

iTrader: (3)

I was about to post a comment about the ND cup car (which I'm loving)

But then I noticed that one of the tags for this thread is "erect injection"...

That is all.

mcfandango

iTrader: (1)

Wonder if Mazda would ever do a Body in White option for the ND. Be easier to turn it into a Prepared car than chopping up a new(ish) street car.

sixshooter

iTrader: (12)

I'm just glad they fired the Japanese cartoonists that were drawing all of the stupid "faces" for the fronts of all of the cars in their lineup. The Japanese are known for their high tolerance for cute and it is annoying.

cyotani

iTrader: (8)

such KAWAIIII!

Dunning Kruger Affect

Looks like we might be getting specs this week since the LA Auto Show is going on. Right now it's speculation on specs, but who knows.

I can only hope that this will stop the trite and awful "I PERSONALLY THINK THAT THE MIATA SHOULD HAVE $actual_hp_plus_20 HORSEPOWER AND I WILL WRITE MAZDA A POLITE LETTER VIA THE PONY EXPRESS IF IT DOESN'T MEET MY EXPECTATIONS I'M CURRENTLY CROSS SHOPPING A LEXUS LX470, TOYOTA SIENNA, AND BMW 135I AGAINST THE ND" bullshit on mnet, but I'm naive as ****.

Ryan_G

iTrader: (8)

There has to be atleast 20 active threads like that on m.net