Thread: VE+T or DET

Was reading some documents on G20.net and came across Snickers talking about DE-T vs VE-T. If you guys can't see it, I'll quote the highlights.

That pretty much outlines all of the dangers of going RR-T or VE-T. Also talks about VE Head on DET, which I'm definitely considering a lot more now too.

If you want good gas mileage, buy this(or a Metro I suppose):

Friend had that, not impressed by gas mileage at all. If I wanted good gas mileage I would get a 1.6l 200sx. It faster then Festiva and gets better gas mileage.

I guess most people fail to realize that I got 15mpg city off boost, which is what I'm trying to avoid

Bigger injectors=poor gas mileage.

My 1300cc of fury in my old festiva still got about 30mpg driven very hard. It was carbureted and smoked like it was on fire. When you'd shut her off, she would diesel and cough, sputter and backfire to death. The epitome of the beater car. In a word...awesome!

I get about 22mpg now in the super sentra, but I am not nice to it.

Anyway, the original Disco Potato sentra was running 18psi on the disco potato turbo with the stock RR engine as well. I think it had water injection though. At any rate, I don't see the RR engine having issues until over 350whp. At that point I would build it.

Reading Snickers "VE head swap on a DET" makes me want to go that direction. I learned something from this sentence- "The DET oil pump is good enough for VVL and the oil pump, it is almost as large as a VE pump but the front cover has larger oil passages in it for better flow."

I think I read with a VE head you add .7 to the compression ratio so now a DET's 8.5 would increase to 9.2, almost the same as a stock DE 9.5 compression ratio.

The GT3071R is supposed to be one of the most efficient set ups and I could stay out of boost while cruising along.

I just had my DET head redone, wish I would have though read this first.

Not always, not properly tuned bigger injectors = poor gas mileage. B14 ECU's don't have a way to adjust the TTP Min, which is minimum pulse widths at a certain RPM's. Since bigger injectors feed more fuel per ms, you need to turn that number down to tell it to flow less. B13 ECU's let you adjust it no problem though.



I'm thinking about doing the same, just switching out the oil pump to the VE one too.

9.3 CR is great too, safe enough to run enough timing, plus you have the DET block and girdle for the strength.

personally i dont see where larger injectors are worse for gas mileage. like vad said, properly tuned fuel map and ignition map really fuel injectors shouldnt effect the gas mileage. esp if you can run 4 bar of fuel, and get those benifits

I just did some research in "How to Build Nissan Performance Sport Compacts". After reading the formula on pages 109-110 pages and I'm going to edit my post #57.

Even though previous posts have said add .8 to the compression ratio for the SR20VE head, the correct number is .7.
So a Sr20VE head on a DET ( with an 8.5 compression ratio) would result in a 9.2 compression ratio.