Would we be able to use the ECU-wiring harness stuff from a VQ30DD to run Direct Injection? Wouldn't this allow us to safely run like 12.5 compression on pump gas? (We get 94 Octane here) I say that would be a good combo with the superior 3.5 heads (cooling and knock surpression).

 

I think the US gas has too much sulfer in it to use nissans DD

 

It's not so much octane that's the problem (we have 93 and 94 pretty widely available here everywhere except Cali), it's the sulfer as Kev mentioned.

 

Doesn't direct injection use very high pump pressures? You would have to modify your fuel system

 

255lph high pressure perhaps?

 

How does sulfer in gasoline affect engine performace?

 

I believe sulfur might be bad for the DI injectors

 

USDM Mazda cars have DI...

 

mazda isnt the only company today with DI in american sold cars. they are saying the problem is with this particular setup from nissan, not that it cant be done

 

Like I said... IN NISSSAN's DD


Do some google searches on it, I found plenty of info back in the day when I found out about the motor.

 

ahh I see, I just thought DI would be similar in other motors as well...

 

Changing from Multi port to Direct injection would be an undertaking to say the least.

 

yes yes it would...it would be sweetness but quite the Undertaking as u state it

 

More like virtually impossible

 

Yeah, what do you know?

I wonder if that's the Tier 1 gas that's out? For DI?

 

why would he buy US gas? unless we pump our stuff up there to americas hat

 

NorthAmerican gas happy, ahole

 

lol, if it cant be done in the US, it cant be done in Canada either. The only advantage I have is nigh sea level, but poorly prepped tracks. The gas is most likely the same type of ****.

I was really curious about this one ever since someone brought up a hypothetical VQ35DD in an old thread. Since I'll be running this engine like a 3.0 I wanted to know if it was possible to use 30DD stuff to obtain a 35DD.

Looks like it's back to searching how high of a compression ratio we can run in North America, on pump gas with the regular 4th gen multi port setup.

 

The new Toyota 3.5 liter V6 in the IS350 is a DI.

And I thought they had removed the high sulfer content in North American gasoline for '07 as they did for the diesel fuel.

 

Where did you read this?

 

For the gasoline? I don't remember. Which is why I am not trying to state it as fact. But they do have it posted on the diesel pumps.

 

Hope these help:

http://www.fueleconomy.gov/feg/lowsulfurdiesel.shtml
http://www.eia.doe.gov/oiaf/servicerpt/ulsd/index.html
http://www.npra.org/issues/fuels/gasoline.cfm
http://www.dnr.state.wi.us/org/aw/ai...urfuelfaq.html

 

Sweet, good to know. I wonder how the extra ethenol(spell?) in the gas in the NE affects direct injection.

 

so does this mean it would be possible? meaning it would work ok, not that putting it on would be possible

 

ethanol is always a good thing, if anything it will aid in allowong people to increase timing even though it might be a little bit...but i dunno how much extra ethanol is in the gas

 

No it's not a good thing. It is only good if the car is made for it.

 

Ethanol is a good thing? In what way?

 

wat do u mean made for it? minus altering the timing, possibly a fuel filter change since the ethanol will break free sediments in your tank and maybe less mpg running more ethanol will do no harm to your car.

in addition to hopefully being cheaper and give you more power ( even though less mpg) ethanol is great for people who can tune a car since it has a high octane rating and will help reduce detonation. so in theory u can run the same car harder

 

Power gain not found. Maybe pure it might be good, but when its mixed in with gasoline it is no good.

 

e85 is ethanol mixed with gas.....if u can get ur hands on some it has an octane rating of something like 108 or something. run that with more timing and there is yoru power gain, and also your 15% or so loss in mpg


pure and cars wouldnt start in cold weather in the NE.

 

So where can you buy E85?
The little bits of ethanol mixed with gas is not helping any.

 

there is an e85 locator online somewhere i misplaced it, but yeah the 10 or so % in what we have now, which i think is called e10 or gasohol or something liek that, isnt doing much for us aside from burning cleaner. i kno they sell it in our area but only on military bases or something for testing before its available for public use

 

It costs more to burn E85 than regular gasoline.

 

Ya I know. I was just stating, there arent many places that have E85 so too me there are no advantages. I really didn't want an answer to my question

 

http://forums.maxima.org/showthread....ghlight=sulfur

I was very surprised they didn't just make a VQ35DD instead of the VQ35HR. Mazda and Lexus and I think maybe VW/Audi all use DI here. I don't see why Nissan can't do it. Super high compression, better mileage, and more power FTW. Changing those injectors would probably be a major PITA.

However converting to DD aftermarket would be very, very difficult. You would at least take a new ECU, probably wiring harness, fuel pump system, and different heads to get it to work.

 

That is why I suggested all stock VQ30DD stuff. Aftermarket would also be very expensive I think.

 

No I meant converting to a VQ30DD even with the JDM OEM parts. Aftermarket as in converting it custom, i.e. not having Nissan do it from the factory. I have never even seen VQ30DD parts in the US, so that would be your first thing to accomplish in something that seems rather uphill IMO. People have done plenty of other things that others said were impossible or not worth it so if that is what you want to do, go for it.

 

I am just brainstorming on how to create a reliable, high HP, high revving NA VQ. Hence the thread about using a VQ30 crank and sleeved VQ35 block.

 

I have yet to see a DD for sale. If you can find one, I am sure you can make it happen.

 

The problem I think is that the 30DD most likely uses the 3.0L oval ports so my VQ35 lower IM does not match. I am only planning on a custom upper intake manifold (ITBs) but am not touching the lower with a 10 foot pole for now.