Nissan 370Z Forum - Greddy Twin-Turbo In Development

Nissan 370Z Forum (http://www.the370z.com/)

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- - Greddy Twin-Turbo In Development (http://www.the370z.com/forced-induction/6028-greddy-twin-turbo-development.html)

Quote:

Originally Posted by in.the.dark (Post 122511)

Wow. You are missing the entire point. Not to mention going overboard and being quite rude. This forum is pretty laid back, so grab a beer and chill.

The 370Z still isn't light, and listing a bunch of heavy cars doesn't make it light either, save for relative comparison to those cars. It's not about math, it's about weight.

Now maybe you just aren't aware of what is considered normal weight. It's fine. I've owned quite a few cars and have good points of reference. For the industry, three thousand pounds is considered a normal sized car. The majority of cars are on the big side. Which means that the Z probably finds itself closer to the average size of cars that are much larger. No one would argue that any of those cars you listed aren't heavy (except again, perhaps relative to other cars you listed). Also, no one would argue that the Corvette is light, much less VERY light as you said the Z is and the Vette is 100 lbs lighter than the Z.

Your numbers are close, but still a little low. The 370Z Touring/Manual has an actual curb weight closer to 3330 lbs. Want proof? Forged Performance weighed their car on corner scales with nearly a full tank of gas (which is how you are supposed to measure curb weight in the States) and got 3323 lbs. Top off the tank and see where she lands (hint: it's more than 3323).

Now, this thread isn't about weight. If you want to continue the discussion of the 370Z's weight, please feel free to start a new thread and PM me to take part.

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As for the 20G, I had mine on a 2.3L stroker on my 97 Eclipse GSX. That thing spooled very quickly and never ran out of steam. I ran it at 21psi on 93 octane here. It's kind of conservative, but I prefer to overbuild and underrun in order to add longevity.

show me another car thats close to the price range of the z with the same power but lighter and ill consider the z not be a very light car.

im not talking about a Porsche which is 20k above the z price.

If we payed 60k+ for the z im sure it would be within 2900-3000lb

Quote:

Originally Posted by armensti (Post 122769)

I said I'm not jacking this thread and you should agree to that. Since you won't take my advice, here you go: http://www.the370z.com/nissan-370z-g...light-car.html

Can we talk about the turbo kit again?

Quote:

Originally Posted by LiquidZ (Post 123054)

Can we talk about the turbo kit again?

Sure. Assuming that they are planing to run sub 12 psi, I don't think even the 20G is a good match for this application. It's a step in the right direction compared to the GT28.

20G turbo woah, wouldnt it take very long to spool up compared to a 18g turbo?

LOL NO...20G are old, and there has been alot of tech since 20G were, OMFG SO BIG!!!

HA! You want find it hard to spool two of these bad boys say, around 3200rpms..

Were not talking greens or reds...its a 20G, we shouldnt have to hard a time to spin them quickly...

+1 for in.the.dark! way to go keeping the thread on topic!
anyways! back to topic~! 20gs Droolz~!

Two 20Gs ?! 20G best efficiency is @ 20PSI and it holds good efficiency to 24-25PSI. Also As far as I know it has journal bearings, so it's slower than ball bearing for spoolup.

Most DSMs run these @ 18-23PSI and make around 400HP using single turbo on 2.0L motor. I think these would be little too big for 370z for a simple Stage1 400-500HP@ 10-14PSI config, more like 650-750HP @ 20PSI setup.

Anyone got engine flow chart for 37VHR?

bigger isn't always better, 20g is too much.

Quote:

Originally Posted by kdoske (Post 128009)

bigger isn't always better, 20g is too much.

+1. I think the greddy kit won't be as popular as it was on the 350Z and many more 370Z owners will be looking into other TT kits or most likely S/C kits just because they don't want that much turbo lag nor do they want that much power.

Don't you guys think that the folks over at Greddy know what they are doing? I have no idea what the difference is between an 18G or 20G turbo...so let's just see how it turns out....hopefully better then some are expecting.

the 20G's are on the tuner kits for 350Z as well, but 18G's on the bolt on kit, but it seems the tuner kit is the way they are going so they don't have to deal with the lack of a good engine management from Greddy

the tuner kits come with the bigger turbos assuming people will go big with an engine build and such, they are bigger and will have a slightly lower spool but probably not very noticeable

rockin the mitsu turbos :)

Quote:

Originally Posted by in.the.dark (Post 123096)

Sure. Assuming that they are planing to run sub 12 psi, I don't think even the 20G is a good match for this application. It's a step in the right direction compared to the GT28.

20g's are quiet a bit larger than gt28's..coming from mitsu i would say that a 16g evoIII would be a good twin setup for 12 psi..they have good flow volume but can run almost 30 psi...a 20g i would think would be to big for a low boost tt setup...FP sells a turbo with a 16g housing and 20g internals, quick spool and monster top end

Quote:

Originally Posted by Mitsuyager9 (Post 128426)

Well, if you want to go that route, even the EvoIII 16g is going to be too large, but yeah that's exactly what I'm saying.

As for SixBone, GReddy is probably assuming that the person putting this kit on has dropped their compression ratio and will be running in these turbo's efficiency range.

For a street setup, the sweet spot would likely be somewhere in the T28 (not GT28) to 16g range in mitsu-speak. The spool would be instant and would hold to redline. I'm looking for a good compressor map. Anyone?
http://turbocarz.com/shapegsx/16g/compressor_plot.gif http://www.ztechz.net/sitebuildercon...6h-20g-cfm.gif
http://www.atpturbo.com/root/maps/im...rscompress.gif