Nissan 370Z Forum
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Nissan 370Z Forum (http://www.the370z.com/)
-   Nissan 370Z General Discussions (http://www.the370z.com/nissan-370z-general-discussions/)
-   -   Direct Injection! (http://www.the370z.com/nissan-370z-general-discussions/2780-direct-injection.html)

drisko 07-15-2009 02:27 PM
Quote:
Originally Posted by 370Z Purist (Post 112409)
It keeps the fuel spread out nearly perfectly in the cylinder, encouraging more complete combustion, which increases efficiency in the sense of more power (since more fuel burns) and cleaner exhausts (since more fuel burns). This is versus mixing fuel into the air at the throttle body area (well, a bit more past it). Fuel can "clump" so there are concentrated pockets of air and fuel mixtures, making combustion uneven and inefficient.

In general, it is significantly easier (chemically / stoichiometrically) to burn perfectly vaporized fuel than if were in a liquid state. Gasoline aerosolizes in air though, so it's difficult to observe in real time.

Direct injection is damn near the best thing you can get in any engine. But as mentioned before, a bad fuel pump or atomizer / injector will ruin any possible horsepower gain.

A good DI system provides good gains across the band, but particularly in high RPM ranges, giving good top end power (obviously, fuel has less time to spread out, so a good injector can do this better than a premixed engine, like the sequential mixer we have in the VQ37VHR).
I believe the DI systems also make more power because the car can run a slightly leaner A/F ratio (the fuel amount is more precisely controlled).

Shane D 07-15-2009 05:36 PM
Nissan developing new type of fuel injection
 
Not sure if anybody here watches Autoline Detroit, but it is a quick daily dose of auto info. Todays story mentions that Nissan is developing a new fuel injection system, incorporating Dual Port Injection. Should debut in 2010.

Pretty cool system that give you six to seven minutes of auto news each day.

Check out:
Autoline Daily

Shane D

tolnep 07-15-2009 06:20 PM
Quote:
Originally Posted by GMZ (Post 114752)
Um no dude. You still have to pay state sales tax and any FET at time of purchase, you just get that amount back from the feds at tax time next year. Read the IRS bulletin.

ETA: Never the less, good news.
thats a deduction , not a credit .. say you are in a 50% tax bracket... and you pay 2000$.. you get around 1000 back i think is the way it works..

now a tax credit.. that would be cool. you owe 5000 in taxes, the 2000 reduces the tax to 3000.. basically you get 2000 bucks back that year...

and i think that's one thing they outta do for the housing industry is give some large tax credit to purchasers, which they could then spread over more than one year... but the obama plan is to put money into public works mostly which employs some lower wage earners to do things like build roads and schools and they in turn buy more 12 packs and lottery tickets which doesnt help the economy much and of course the banks got money but they dont want to lend it out anymore..

so now i get off my soapbox....

whoady4shoady 07-15-2009 07:06 PM
Quote:
Originally Posted by need4speed (Post 114489)
The 2500 rebate was obamas 1st tax break. It was national news now in february.
The dealership is supposed to waive ur tax up to $2500 on site of purchase.
Unlike the real estate $8000 credit the car credit is instant.
And if u have an old clunker. You can get up 2 another 4500 if u give it up.
So right now there's up to 7000 in money u can claim depending on ur situation
And what kind of car you will purchase. 09 is free cash year. Lol
I never heard antyhign about the dealers waiving the tax fee instantly. I only read that you may get it back on tax returns.

avitech 11-28-2009 12:39 AM
It would be nice if Nissan would offer the 370Z with Direct Injection. What I would like to know is how it would be assimilated into the current V6 design. It might be as simple as keeping everything else but designing a whole new cylinder head(s) and engine fuel management system. Who really knows what they are up to. For all we know they are doing beta testing right now as I type in some laboratory in Japan. I could try calling the 800 number for Nissan customer service but the girl on the other end of the line usually doesn't know anything about the products. When they do add the Direct Injection. That's going to be the time to buy. If I were to get one now I would just lease since it's not D.I.. The future is in Direct Injection. The oil companies are reformulating their gasoline for it at the present moment. If they can make this work it would mean less pollution, more fuel efficiency, more horsepower, longer engine life, and money savings. It's a win win situation for everybody.

avitech 11-28-2009 12:47 AM
Quote:
Originally Posted by Mr. C (Post 113866)
Nissan Introduces New Dual Injector System - Worldcarfans
Nissan introduces a dual injector solution for small motors. On sale in the 2010 fiscal year

Nissan needs to hurry up and release DI for the V6! I hate waiting.
This is bad news. Because Nissan is going for a cheaper approach instead of offering Direct Injection that increases efficiency by up to 20% instead they offer us just a fancier injector that splits the fuel two ways for an increased fuel economy of a measly 4%. Shame shame shame. It's like buying an air to air heat pump for your house instead of a fancier geothermal heat pump which is far superior. It costs more up front but saves you money in the long run. Nissan is going the cheap route. I wonder when they will ever join the ranks of automobile manufacturers with D.I.? Shirley they won't be the last to adopt it will they? It's like being the last car company to adopt fuel injection instead of carburetors. Progress is slow...

:mad:

gleonard 11-28-2009 12:49 AM
Quote:
Originally Posted by Forrest (Post 112567)

$3200 tax break, here I come!

avitech 11-28-2009 11:05 AM
Quote:
Originally Posted by gleonard (Post 298427)
$3200 tax break, here I come!
The catch is that you have to rely on the government to reimburse you on this one. This could take several months to over a year. Government can be a real hassle at times.

theDreamer 11-28-2009 11:07 AM
Quote:
Originally Posted by avitech (Post 298681)
The catch is that you have to rely on the government to reimburse you on this one. This could take several months to over a year. Government can be a real hassle at times.
Wrong, this tax break is filed with your yearly tax return, therefore it should not take any longer to get it, unless the gov't decides to audit you.

avitech 11-28-2009 11:20 AM
Quote:
Originally Posted by theDreamer (Post 298683)
Wrong, this tax break is filed with your yearly tax return, therefore it should not take any longer to get it, unless the gov't decides to audit you.
Oh, well that is good news to hear. So basically you get the money back as soon as your taxes are filed and you mail the IRS your check. It's a good thing they don't just take all the money and then reimburse you for it at a later date. I'm sure some countries do this in order to profit off of the interest.

$3,500 buys a lot of premium gasoline for that 370Z.

kannibul 11-28-2009 05:28 PM
Quote:
Originally Posted by gleonard (Post 298427)
$3200 tax break, here I come!
That's $3200 applied against your earned income, not a rebate or anything like that.

Ends up, for me, being about $50-100...depending on my final numbers...I think.

kevr6 11-28-2009 06:36 PM
Quote:
Originally Posted by Island_370 (Post 112592)
Audi (and others, I believe) have noticed some issues with direct injection. Without fueling going over the valves, nothing is "washing" them. Some of the Audi FSI (direct inj) motors are having valve issue. The build up is likely realed to the PCV, the EPA requires the motors digest the crankcase vapors. So I am not too excited to get a direct inject motor until these issues are resolved....be it valve coatings, secondary injectors in the intake, "scheduled" seafoam treatments....something.
:iagree:
Plan to have scheduled induction services if you want Stratified Injection. Misfires become a way of life with this continents fuel quality!! ;)
(VW/Audi Invention!) :tup:

Supragtsxr 11-28-2009 08:21 PM
Quote:
Originally Posted by 355890 (Post 45143)
2009 you get a $ 2,500 tax rebate for the purchase of a new car.

Why not ???? 3 years of ownership on this model .... will be just the right time to swap for another.
WHAT? What is this tax rebate u speak of? how do I get it? Info PLZ!! I bough my Z back in September. Is it too late??!?!?

gumpy 12-22-2009 04:31 PM
will you be able to buy a new engine and put it into the current z?

i'd really like DI, esp if the engine sounds better as well...

Daishi 12-22-2009 07:53 PM
Quote:
Originally Posted by gumpy (Post 337534)
will you be able to buy a new engine and put it into the current z?

i'd really like DI, esp if the engine sounds better as well...
the engine wont sound better with DI.. generally all the vw's and cars with DI sound broken with all the loud ticking the DI injectors produce haha.

GTRFAN 12-22-2009 08:21 PM
Nissan should just get on with it and make the 400ZX turbo! Now that'll be worth upgrading to.

gumpy 12-22-2009 09:59 PM
Quote:
Originally Posted by Daishi (Post 337999)
the engine wont sound better with DI.. generally all the vw's and cars with DI sound broken with all the loud ticking the DI injectors produce haha.
my dad's R36 doesn't tick at all... the engine sounds quite good actually...

i should see if there's a way to get that engine in the z =)

ianthegreat 12-23-2009 08:43 AM
QUOTE=Brazilbro;45183]Doesnt adding D.I. make it harder to upgrade your fuel system? Isnt that the problem they are having with the BMW I-135 running out of fuel past 6k[/QUOTE]

Yes, it makes regulating fuel much more difficult. Custom intake manifolds can solve this, but you're looking at a completely new control system/ecu for the car. Horse Power Freaks are known to do this and are working on a package for the 335i currently.

The n54 isn't necessarily running out of fuel past any rpm range, you're probably thinking of turbo efficiency. So far the n54 is limited to around 440rwhp in it's current set up (stock turbos). Time will tell if they can push that limit with the stock turbos/fuel system. One company has ported the stock turbos and achieved 500rwhp+ on the stock system, but I think that's pushing it a bit.

In reality, turbo upgrades are right around the corner with all the new flashes available. Hope this helps! :]

Additionally, a SC'd or Turbo'd VQ with DI - :drool:

ianthegreat 12-23-2009 08:47 AM
Quote:
Originally Posted by alan93rsa (Post 46301)
If the same fuel pump woes follow the Z with direct injection then I am happy not to have it. I kept waiting for the fuel pump to fail on my 335.
haha +1

i'm actually dreading this as I'm at 34k original HPFP. I'm just waiting for it to die so I can reinstall my mods :icon14:

spearfish25 12-23-2009 09:27 AM
Holding out for direct injection is ridiculous. Get some bolt ons, you'll make the same hp and have the car now.

gumpy 12-23-2009 07:07 PM
Quote:
Originally Posted by spearfish25 (Post 338736)
Holding out for direct injection is ridiculous. Get some bolt ons, you'll make the same hp and have the car now.
I don't want it for the extra HP... i wanted it for the fuel efficiency, i'd love to be able to drive from Sydney to Melbourne on one tank. I'd also like a better sound from the engine, I don't know if the same engine design with DI will make a difference to the sound however. Just a hope really.

spearfish25 12-23-2009 08:42 PM
The improved fuel economy will be minor at best. The current 370 can get almost 500mi (highway) on a single tank as-is. As for engine noise, just get an intake and catback exhaust. Sounds sweet :)

tvfreakazoid 12-28-2009 05:34 PM
All car manufactures are doing it. Nissan should just put it to use for the z so it can have more power.


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