Compression & 1JZ.

[Silent Knight]

I'm really after the higher compression to get a better response etc.

If you are after response why go single turbo?

I'm not going single turbo at the moment and I haven't fully decided whether I want to yet.

The other option I was concidering is the HKS T3G kit for the 1JZ which should be adequate for around 300+rwkw but that's next year sort of plans.

[Si]

just read the article in NZPC about that red jza70, (the article sucks btw. nzpc are fags)

the car is a pretty ruthless piece of work however,

dirty big turbo, couple of extra 850cc injectors, fuel pumps, cam gears/cam grinds, ecu's and out cranks 488rwhp

[Silent Knight]

I can't stand NZPC so I'm not going to read it.

[Timmo]

well in terms of compression, the jzz30/31 update for the 1996 year upped the compression of the 1j when the moved to the single turbo. As far as i know the internals werent changed but the head was of course (addition of VVT-i)

How much are you planning to spend? You have to consider importing a modded soarer from Japan- can pick one up for around the 10g mark and most of the work is done for you (although they often require a tune to match our cr*p fuel, you have to import a 1996 and newer model due to frontal impact compliance which means single turbo 1j ...if you do your homework and use a good importer you can make some substantial savings...often modded cars are about the same price as orginal cars.

Try www.cwicars.com.....

[Silent Knight]

No I'm not importing another Soarer thanks.

[Si]

need i say more

[gmacrae]

God i wish people would work out that twin turbos dont spool faster than a single.

Anyway, about the stock ecu teaching itself to run bigger injectors... I realise it does this to an extent (open loop), but when running closed loop (on boost) it just sticks to the preset maps with no adjustments... this is what i've been told by a few people now, can anyone confirm this?

You should get 300rwkw from a stock 1j bottom end with the right tune. But from what you're saying you should seriously consider making a 1.5jz with thick HG. If you're after response, 500cc's and higher compression will definitely do the trick

It would be interesting to see how well the stock 1jz ecu runs a 1.5jz with small single (450hp) and 440cc+ injectors. You'd need to make no more than about 15psi with stock ecu so the boost cut defender isnt messing with the map signal too much.

Just tossing ideas round, keep us informed Hanre

Gene

[matt dunn]

God i wish people would work out that twin turbos dont spool faster than a single.

Gene

I disagree there,

We have run a 2JZ on both twin turbo setup and one with a big single.

the big single made more power, about 650 atw,

and the twin setup made 510.

The Single has a very narrow power band and has a lot of lag and then hits hard,

The twin setup has a very wide powerband with smooth and early power delivery.

Matt

[Si]

what RPM torq converter have you got/ordered hanre?
its pretty high is it not?

[Silent Knight]

what RPM torq converter have you got/ordered hanre?
its pretty high is it not?

I've already got a 3000RPM Stally sitting in the shed ready to go in. My mufflers arrived yesterday so the exhaust will be getting made soon and then I'll order the Shift Kit in the next 2 weeks or so.

Gene the spool time of turbos depends on your setup. I've seen many 1JZ boys in Australia get brilliant results from TTs. I've seen them TD04s and HKS T3G kits and who knows what other combinations.

I was concidering going 1.5JZ but if anything happens with that it will be next year. I was planning on rebuilding my bottom end next year regardless so I guess it might be worth it if I source a 2JZ bottom end and get some good internals for it. Will give me much enjoyed extra torque.

Also if I do the 1.5JZ I definately won't leave it up to just the stock ECU to handle things. My SAFC is sold and I'll be looking at getting a GReddy Ultimate soon to through into the mix.

[Si]

i know in a a70 a 1.5jz with stock twins wont fit too well (turbo/firewall issue)

not sure about the jzz30s however. might be something to think of as it would be a pain to get good twins then find the rest wont fit

[Silent Knight]

From what I can remeber John didn't have much trouble fitting the 1.5J in there so I wouldn't suspect I'd have problems in the Soarer really....

Got some bling in the mail for her yesterday aswell...

http://forums.mk3supra.co.nz/test/zorst/zorst.JPG

[Ako]

God i wish people would work out that twin turbos dont spool faster than a single.

Gene

I disagree there,

We have run a 2JZ on both twin turbo setup and one with a big single.

the big single made more power, about 650 atw,

and the twin setup made 510.

The Single has a very narrow power band and has a lot of lag and then hits hard,

The twin setup has a very wide powerband with smooth and early power delivery.

Matt

Yeah, now how about if they were actually equal setups? I could create an argument to go the other way as well!

[the fallen303]

what was the turbo's that were used in the two setups matt? i'm interested to hear about the twin setup, and dad wants to know about the single.

[matt dunn]

Yeah, now how about if they were actually equal setups? I could create an argument to go the other way as well!

What do you mean by equal setup's?

[gmacrae]

Yeah, now how about if they were actually equal setups? I could create an argument to go the other way as well!

EXACTLY. I cant believe people cant see the common sense side of this argument.

Matt Dunn: Of course the twins spooled faster in your comparison, the combined twins obviously have less flow capacity than the single. Compare apples to apples. To put it very simply, if you have a twin setup making say 500hp@20psi vs a single setup making 500hp@20psi on the same engine, if anything, the single will spool faster (slightly) because it has only a single turbine to spool vs 2 turbines (though each one smaller). There is much less rotational mass in a single than there is in a couple of twins. Also less bearing resistance - not that these make a huge difference.

The only way a twin setup will spool faster than a comparabily sized single is if they're run sequentially, that's basically where the myth that "2 turbos are faster than one" came from.

[matt dunn]

Of course the twins spooled faster in your comparison, the combined twins obviously have less flow capacity than the single. Compare apples to apples. To put it very simply, if you have a twin setup making say 500hp@20psi vs a single setup making 500hp@20psi on the same engine, if anything, the single will spool faster (slightly) because it has only a single turbine to spool vs 2 turbines (though each one smaller). There is much less rotational mass in a single than there is in a couple of twins. Also less bearing resistance - not that these make a huge difference.

The only way a twin setup will spool faster than a comparabily sized single is if they're run sequentially, that's basically where the myth that "2 turbos are faster than one" came from.

Ok, I see what you mean.

[gmacrae]

Silent Knight... Keep an eye on trademe for a 2j. I've seen a few on there in the last few months, usually around the 1k mark with loom and auto on them. Coz 1j and 2j have identical bore size you could use your 1j pistons. The stock 1jz-gte parts have oil squirters unlike the 2jz-ge ones right? This should drop the CR and would be a pretty tough setup.

BTW, i've got a set of high flowed 2j turbos here (buggered bearings), not sure if your ct12a's could use any of the wheels? If so, lemme know, they're gathering dust

[Si]

ill take them off your hands in exchange for beer

[the fallen303]

1j pistons won't work in a 2j block. they are the right bore, yes, but the pistons themselves are a different design, and sit to high. if you want to use them, you have to get them skimmed to match the top of the block, which i think is a $&#$% stupid idea, hence why the 2jz block i bought is basically going in the bin now.