Turbo combinations for my 1GZ

**6BOOST** · 12-12-2006, 06:31 PM

AS I said, 2x to4z's are perfect in both making 1000rwkw, making the fastest spool of any turbo in the garrett catalog on this engine with that power output, and only marginally go into surge in the midrange, which is inevitable with an engine that is only 5 litre and making 1350rwhp. GT40's and so forth will be laggier, and aren't needed, the Z's are big enough to do the job. The GT35 will only flow enough for about 900rwkw, and will make full boost around 4100rpm with a .82 rear housing. You'll need 30-35psi of boost depending on your intake manifold and camshafts.

6BOOST

**Draven** · 12-12-2006, 07:30 PM

have we even established if we changed his mind on actually aiming for 1000rwkw?
I'm still firmly voting for twin GT30s, ~600rwkw - more than enough power for anything except dyno queening

**Kagetsu** · 12-12-2006, 10:17 PM

At the moment, there's still time to change my mind.
The reality is, I'd rather go for 600. Basically for control, but because tuning for street use at 1000kw's is hard, and it's not really compatible with street driving (at all really).

The real wish for me is that I could if so choose to, let my sister drive it, and have a 'detuned' setting which washes off most boost, to a limit of say, 250kw's. The 5L's will mostly compensate for the lag, so it shouldn't be too much of an issue a little bit being there.

Then there are times, when I want 500-600rwkw's... Tune it to that for the time, and go hard. (track meets, and the occasional drag to give people a look).

That said, I'm hardly going to cry if I can't do such a thing. Wouldn't mind a detuned setting for saving fuel though. ^_~

**Norbie** · 12-12-2006, 10:39 PM

Saving fuel?? This thread starts off with talk of 1000rwkw and now we're talking about fuel economy?

Seriously, even with 600rwkw you're not going to have anything resembling fuel efficiency. Better make a decision now, what do you want this car to be, what do you want it to do? It's starting to sound like there's some contradictory goals here.

**millsi** · 12-12-2006, 10:40 PM

1000rwkw FTW!!!!

**Mr Ed** · 12-12-2006, 11:49 PM

Is this thing going to be a daily?? I farken hope not!!

**Kagetsu** · 13-12-2006, 01:59 AM

Ha ha.. No, not a daily.

As for saving fuel, I mean that relatively... ie. If I'm going out cruising one night, I don't want to burn 70L on less then 100km's because while it's tuned good for max power, it's lean as shit on a corner store run. ^_~

I'll put it this way.

The reality I'm going to have to deal with is that I want it to run MAX reliably 550rwkw's (give or take 50). I don't see that being a problem, even managing to retain some form of good response.

The 1000kw's is a flight of fancy. Ie, take it to a Dyno shootout and blow everybody away.

That said, I'm sure there'd be some people out there for the hell of it, lending me two T04z's when that sort of things comes...
Right?
^_~

PS. I don't nearly expect anywhere the fuel efficiency as what I have now.

Ignoring all that, this thread is more about ' It's okay Kagetsu son, you can have your cake and eat it too '. ^_~ while having someone with their arms around my shoulders nodding and understanding what I want.

**rob_85** · 13-12-2006, 02:04 AM

why does it have to be turbo ?

1gz a80 would be rare as ducks nuts anyway ?

**IN 05 NT** · 13-12-2006, 08:34 AM

all i can say is this thing is nuts!....

abd when you get it going im coming to NT for a spin!

**Mr Ed** · 13-12-2006, 08:35 AM

Originally Posted by Kagetsu

As for saving fuel, I mean that relatively... ie. If I'm going out cruising one night, I don't want to burn 70L on less then 100km's because while it's tuned good for max power, it's lean as shit on a corner store run. ^_~

EFI engines dont use ridiculous amounts of fuel unless you use ridiculous amounts of power. (Ie. control your right foot and youll be fine)

The reality I'm going to have to deal with is that I want it to run MAX reliably 550rwkw's (give or take 50). I don't see that being a problem, even managing to retain some form of good response.

Twin GT3040s FTW

When you do your layout, keep a bit of extra room around the turbos position just in case you end up wanting to upgrade to a larger frame turbo. I think T04z and GT30s are all a T4 flange arent they?? Dump/IC pipes would need a bit of modding for the swap though.

Could always use twin T04z with crazy small turbine housings for the street and whack on a 1.0 or something and pump up the boost for a dyno comp.

The 1000kw's is a flight of fancy. Ie, take it to a Dyno shootout and blow everybody away.

In Darwin you could probably do that with a BPU 2JZ

**Kagetsu** · 13-12-2006, 08:49 AM

That's basically what I was hoping, if they have a universal flange... ^_~'

Also, Just FYI the car is being worked in the vacinity of NSW, so it's quite possible that in the next year or two, if you see a Supra (unsure of colour at this stage) going about with an interesting note, and the NT plates, ENIGMA, honk and wave, and I'll pull over into the nearest parking lot, assuming I'm not rushed to get somewhere. I'll be attending a cruise or two when it's done as well, so there's the opportunity there.

-

Why I'm turbocharging? Partly because I can. My dream for this car is to make it Supercar level (which means super car costs no doubt). These days the rage seems to be Bi-Turbo, and looking at the results of cars such as the Maybach S57 and S62, which use a Biturbo V12 (5.5L) and attaining some incredible figures with those, I can't see why this car couldn't have a similar (all be it slightly extended) response range. That said, with a good set of H Beam rods, worked head, polished ported and flowed etc, as well as work bottom end... This engine should be capable of more.

I've aquired a second dash, which will be used as a model to rebuild a new one from Carbon Fibre and leather. I have idea's for it, but they'll be posted as progress is made. The interior is being converted to two seater and various other components will be installed using that space. The boot space will be moderately extended, as I'd still like to have the ability to put stuff in it (ie, use it).
Sound system has been purchased already, and I can tell you, it's a really good one.

**Mr Ed** · 13-12-2006, 09:19 AM

Id consider a trip down to Sydney just to see this beast! Perhaps it could be what we need to finally give the SupraNats a kick start? Gives us a good while to plan, and gives you a deadline!

Should be an frikin awesome car. Everything sounds like its going to be very tastefully done.

I hope a fair bit of chassis strengthening is on your list of mods too!

**Kagetsu** · 13-12-2006, 09:25 AM

Chassis will be worked on indeed. Have already done minor stuff, but some major stuff is in the works.

**Shifty** · 13-12-2006, 09:53 AM

(haven't read whole thread, just first half dozen posts)

A twin turbo 1GZ will never be slow, so bring down your aims and you'll end up with a spectacularly torquey, powerful and driveable machine that impreses all and sundry! Also remember that the less power you're making the more reliable/safe your engine becomes. With 1000rwkw you will also never get traction.

I've been in plenty of fast cars, and in my experience you couldn't possibly want/use any more than 400rwhp in a light car or 600-700rwhp in a heavy car (this will probably be you). And please, a Diablo is not fast (in acceleration terms - top end capabilities are very impressive but more due to engineering/aerodynamics than power).

Unless of course you're just after a dyno number, in which case go for your life.. as long as you understand that people will be impressed for about 15 seconds... then realise you don't drive it and spend much more than 15 seconds bagging you out.