Greddy Twin-Turbo In Development

LiquidZ

Can we talk about the turbo kit again?

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Scribe

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.

Mitsuyager9

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

Scribe

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?

Mitsuyager9

yea i know even the evo 3 would be a little big but it gives you some room for lower compression if you wanted to do a rebuild someday...the small 16 or t28 would be a better option if you plan on keeping stock compression ratio for as long as you own the car...a 14b would be the closest if you wanted to run 12 psi...i know there are plenty of graphs but i dont feel like hunting right now

nq23

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

DannyGT

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...

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Performance GTM Stage 1 SC, GTM Res.Test Pipes, Invidia Gemini Exhaust, GTM HD Oil Cooler
Wheels & Suspension AME Tracer TM02's 19x9.5F 19x10.5R w/ 265x35F & 305x30R, Hotchkis Sways, BC (BR) Racing Coilovers (Car Sold)

Shunya

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

theART

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?

kdoske

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

nightfire

+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.

kannibul

I think the key is controllable power. One nice thing about SC's is that it's instant, both with on and off throttle - no spool up time (granted, turbos are getting better spool up times, but, still not as quick!)

SixBone

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.

westpak

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

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Mitsuyager9

rockin the mitsu turbos