1JZ bigger twins or a big single???

[GZP51]

Ok everyone, this is a n00b question and i am expecting some flaming/ridicule/poo flinging/my dad is bigger than your dad bs LOL!
the question i want to ask is what would be better for upgrade on the 1jz? going the tried and tested big single route or slapping on some bigger twins?
i have a fair idea of the amount of work involved in either circumstance and realise that it is costly. up until this point i was planning on eventually (when i get the car running properly standard and have fundage) going the big single route as it is a great way to make horsepower out of the 1J. but i was daydreaming at work and telling some mates what i wanted to do and one asked why not go bigger twins?
does anyone know of anyone that has done this? i am sure it would have been done before but is there any reference knowledge out there? i have done a couple of seaches that yielded bugger all!
What has the potential for better drivability?
Which would have the better response? of course i am after bulk horsepower and FA lag just like everyone else. but which is better? I know everyone talks about the magical 300rwKw mark and i don't want to say that that is what i am going to get, but lets put a cap on the hypothesising at around that mark so that noone thinks i am talking about putting to GT 35/40 on it!
basically just thought i would ask more knowledgeable people about it than i!
I don't want to go the steel wheel/ high flow route on the standard twins as i think that if i was going to do that i would just buy up as many stockos as i could get my hands on and keep boosting them until they popped lol.
any ideas would be great, any info/specs or material of this matter would be better!
cheers
matt

[acmtt]

OK LB,

here it is one more time.

Hybrid turbos, that is machining out the stock housings and putting some gt28 garret ballbearing cores in them. 270rwkw plus. Keeps lag away and gives ballbearing goodness! Just aks Manny, Justin, Shom Reepa on SC forum.
2j turbos put onto 1jz manifolds, not done succesfully to my knowledge as the 2jz is sequential and when converted to the 1j is run in paralell with extra lag thrown in as an added bonus. That is its been done but the results have not been worth while.

Nissan t28 turbos, cheap replacement ability , good for 220-240 easy , but then why bother as the stockies will do that!

so boost those ceramics to 14psi and enjoy. Then a gt30R slapped on or bite the bullet and go the hybrids, they drive well, with linear power. But you probably want that ball tearing burst of BOOST that a big single slaps onto you.

[GZP51]

lol,
thanks bb, i was wondering if there was a slitghtly larger uber powerful boost to 48psi set of twins i could get for about $200 each
obviously not :-(
thank you

[acmtt]

Another single that ischeap to pick up is the CT 26 from the 7M-gte.

[EldarO]

Hiflowed, steel wheeled stockers.

Eldar.O.

[millsi]

yeah u will only need a gt30 to make 300kw at the wheels and it will do it quite easily, its also the biggest around with an internal gate, so that will save you some $$ right there!

[Pimpin_1JZ]

I'm running a big single now. It is an ITS 60-1 turbo, with external wastegate and high mount manifold. So far at 19psi it made 275rwkw. When I get the fuel system sorted it will be making 22-25psi depending on the gains. This should net over 300rwkw. The lag on the big single isn't that much difference between the twins, about 300rpm on my car. But then again, I'm using a 0.49 rear exhaust housing. But good luck with your decision.

P.S. I too was in this dilemma but am happy I went the big single. nudge nudge

[GZP51]

thanks guys and lol @ pimping that is so subtle man!
cheers
matt

[kingmick]

on a 1J two T3s with the right trim will give you the puff for 600hp. they are nice and cheap aswell. That said you need the cams,computer and cooler the go with it!
i know one that was in a sportsedan with this same setup that made over 600hp and lasted nearlly 2 race seasons on a stock bottom end! i was impressed!
when it finally blew it was at a national round, they organised another short motor from an importer, went and picked it up, changed it overnight at the track and where back on the grid the next day!
Budget racing at its best!

[GZP51]

that is the sort of response that i was looking for! thanks.
it had enough 'puff' for 600hp? what sort of lag was involved there? what sort of trim would you need for a 1j if you were setting it up in twin config? the cams are the only thing i don't have other than the turbos lol!
cheers kingmick some rep for joo!
matt

[kingmick]

lol ask me a year or to ago and i could tell you the trim exactly! i should add they where t3/t4
turbos. think used a .82 . they had boost at 3500rpm{from both our memories} and was very very drivable. i rang mate that owned it and he cant remmeber either! lol 2 years is a long time, especially when avgas eats your memory!hahahaha
the turbos will cost you around the $1100 mark each! alot cheaper than other setups!
it will prob come back to me! slowly.
for there price they come under most big singles and make it boost earlier.

[Draven]

the actual turbos/manifold are the cheap bit of this conversion - fuel, computer, wastegate(s), intercooler + piping etc will all cost way more than the actual turbo.

you could always go 2 disco potatoes (GT28RS), which was always something I considered doing - they're a great low-lag turbo (but obviously with 2 you're going to have lag), and you'd be capable of 400rwkw.

My personal preference would be for a GT30, or GT35 - keeping the twins is for if you want to look factory... a big single reduces the pipework and generally simplifies everything

[GZP51]

cheers mate, 0.82? i thought that would be too big to run as twin setup? or am i getting all arse about faced?

[GZP51]

yes i realise all the other ancillary costs involved and the fact that two larger twins is going to give more lag than standard twins, but how much more lag than a big single? lol 400rwKW umm i think i would be better to not even think about anything past the holy 300 lol! cheers for the reply mate

[kingmick]

hahahaha way to big as twins! sorry doing to many things at once!i had it arse around not you! .60 i ment! ive havnt tried them on a 1j but t28's would be in the ballpark to the HP you want and similar money and alot less laggy!
sorry! answering phone,looking after 3 young kids and trying to workout were to put the new intake setup on a 900hp commodore.