Hmmm spend a ton of $$$ now, or wait for next-gen Z with direct injection?

370Zsteve · 03-23-2010, 09:52 AM

Quote:

Originally Posted by theDreamer

Probably not for another four years at least, so I am having fun with this car. DI is nice but not sure it is going to be some that turns the Z into a 450hp/350torque car.

DI is the wave, baby. Catch the wave. Don't be surprised if they drop DI into the existing Z, could be less than 4 years if that's the case.

BMW's TT DI inline-six produces 330 lb ft of torque (in the 7 Series), not so far away from your number...throw in the added power, the fuel economy boost, the better emissions and you have incentive for Nissan, especially as the Euros seem hell-bent on stricter and stricter emissions standards.

kannibul · 03-23-2010, 09:53 AM

Quote:

Originally Posted by 370Zsteve

DI is the wave, baby. Catch the wave. Don't be surprised if they drop DI into the existing Z, could be less than 4 years if that's the case.

BMW's TT DI inline-six produces 330 lb ft of torque (in the 7 Series), not so far away from your number...throw in the added power, the fuel economy boost, the better emissions and you have incentive for Nissan, especially as the Euros seem hell-bent on stricter and stricter emissions standards.

Two key letters in that BMW...

TT

Once you start talking forced induction...

370Zsteve · 03-23-2010, 10:01 AM

Quote:

Originally Posted by kannibul

Two key letters in that BMW...

TT

Once you start talking forced induction...

Oh, don't get me wrong...my OP is all about modding a DI engine as opposed to spending the money now. I have a lot of time on my hands, obviously.

Nick911sc · 03-23-2010, 10:12 AM

Haven't there been quite a number of cases of carbon build-up in engines running direct injection?

Modshack · 03-23-2010, 11:05 AM

Quote:

Originally Posted by Nick911sc

Haven't there been quite a number of cases of carbon build-up in engines running direct injection?

Yes there have. Some of the pictures I've seen have not been pretty.... With direct injection the valves no longer get a flow of Gas which serves to keep them clean. The only air you get is mixed with Blow-by and contaminants (oil) from the PCV system which builds up on the valves and stems. I think Toyota employs an additional upstream injector to deal with this, but most don't. Pics of the VW 2.0 FSI and the Porsche Cayenne have been ugly.. Careful what you wish for.

Here's a pic of the newer VW/Audi 2.0 with direct injection (mileage unknown):

Here's a shot of a friend of mine's VW/Audi 1.8T (the engine that preceded the 2.0) with conventional injection, use of good gas, at 125,000 miles..

370Zsteve · 03-23-2010, 01:05 PM

Quote:

Originally Posted by Modshack

Yes there have. Some of the pictures I've seen have not been pretty.... With direct injection the valves no longer get a flow of Gas which serves to keep them clean. The only air you get is mixed with Blow-by and contaminants (oil) from the PCV system which builds up on the valves and stems. I think Toyota employs an additional upstream injector to deal with this, but most don't. Pics of the VW 2.0 FSI and the Porsche Cayenne have been ugly.. Careful what you wish for.

Techron, perhaps? I read that Porsche techs use this periodically as well:

BG ISC® Induction System Cleaner™ BG ISC® Induction System Cleaner™ will quickly and safely clean fuel injectors and remove hard, baked-on carbon deposits from intake ports, intake valves and combustion chamber. It is designed to be used with the BG 9210 Inject-A-Flush® Apparatus. For complete cleanup, BG ISC® should be used in conjunction with BG 44K,® Part No. 208, added to the vehicle fuel tank at time of service. BG ISC® will not harm gaskets, seals, hoses or any component in the fuel system if recommended cleaning procedure is followed. Catalytic converter and oxygen sensor safe.

Seems odd though, that manufacturers would be rushing to embrace the technology (see the new Infinity M56) doesn't it?

Modshack · 03-23-2010, 01:45 PM

Quote:

Originally Posted by 370Zsteve

Techron, perhaps?

Seems odd though, that manufacturers would be rushing to embrace the technology (see the new Infinity M56) doesn't it?

Fuel additives don't work when the fuel never touches the intake area. With direct injection, fuel is injected directly into the combustion chamber.

Manufacturers are embracing the technology due to the improvements in power, efficiency and mileage.

Most are working on (or have already designed) cleaning set-ups to deal with these problems. If done regularly it might keep things clean, but if not, then head removal and expensive repairs will be the only solution. As I said earlier, be careful what you wish for..

WICKED_GRIN · 03-23-2010, 04:16 PM

Quote:

Originally Posted by Modshack

Yes there have. Some of the pictures I've seen have not been pretty.... With direct injection the valves no longer get a flow of Gas which serves to keep them clean. The only air you get is mixed with Blow-by and contaminants (oil) from the PCV system which builds up on the valves and stems. I think Toyota employs an additional upstream injector to deal with this, but most don't. Pics of the VW 2.0 FSI and the Porsche Cayenne have been ugly.. Careful what you wish for.

Here's a pic of the VW/Audi 2.0 with direct injection (mileage unknown):

Here's a shot of the 1.8T (the engine that preceded the 2.0) with conventional injection, use of good gas, at 125,000 miles..

You can also read about DI problems in the Porsche forums….

BalanBro · 03-24-2010, 05:29 AM

Quote:

Originally Posted by Modshack

Yes there have. Some of the pictures I've seen have not been pretty.... With direct injection the valves no longer get a flow of Gas which serves to keep them clean. The only air you get is mixed with Blow-by and contaminants (oil) from the PCV system which builds up on the valves and stems. I think Toyota employs an additional upstream injector to deal with this, but most don't. Pics of the VW 2.0 FSI and the Porsche Cayenne have been ugly.. Careful what you wish for.

Here's a pic of the newer VW/Audi 2.0 with direct injection (mileage unknown):

Here's a shot of a friend of mine's VW/Audi 1.8T (the engine that preceded the 2.0) with conventional injection, use of good gas, at 125,000 miles..

Seafoam FTW! I bet you'd smoke out an entire city if you attempted to clean that first engine.

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03-23-2010, 10:12 AM	#4 (permalink)
Nick911sc A True Z Fanatic Join Date: Feb 2009 Location: Long Island, New York Posts: 1,698 Drives: 2010 Nissan GT-R Rep Power: 21	Haven't there been quite a number of cases of carbon build-up in engines running direct injection?